Journal articles on the topic 'Numerical evaluation of structural response'
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1
J. Hamood, Mohammed, Layla A. Ghalib, and Ameer G. Abdalwahab. "Numerical Evaluation of Seismic Response of Asymmetrical Reinforced Concrete Frame Buildings." International Journal of Engineering & Technology 7, no. 4.20 (November 28, 2018): 491. http://dx.doi.org/10.14419/ijet.v7i4.20.26249.
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Asymmetrical multi-storey buildings are almost unavoidable in modern structures due to various types of useful and architectural requirements. Latest earthquakes showed that irregular distribution of mass, stiffness and strength cause serious damage in building structural systems. This paper investigates the numerical simulation of buildings with plan irregularity and presents a case study to demonstrate the numerical evaluation of the seismic response of a three real plan-asymmetric reinforced concrete building tested at full scale at the European Laboratory for Structural Assessment of the Joint Research Center, Ispra / Italy within the SPEAR project. The structural evaluation performed through a validated Finite Elements Package, modeled by the general purpose ABAQUS, which is able to run accurate analysis, in particular nonlinear static and dynamic analysis considering both geometric nonlinearity and material inelasticity.Adequacy of the numerical modeling is verified by comparing numerical and experimental results through evaluation of the seismic capacity and dynamic characteristics of the building. The provisions of the adopted seismic code for designing such buildings are also checked over and done with the nonlinear static and dynamic analysis by verifying the proficiency of an analytical model for simulating the nonlinear response of structures considered to conduct an investigation into experiments.
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Fu, Qiang, Jianjun Liu, Jiarui Shi, Xiao Li, Xueji Cai, and Zilong Meng. "Uncertainty Evaluation of Stochastic Structural Response with Correlated Random Variables." Shock and Vibration 2022 (June 6, 2022): 1–16. http://dx.doi.org/10.1155/2022/1496358.
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It has been realized that the influence of system parameter uncertainties may be very significant, even dominant, in stochastic response evaluation. Nevertheless, in reality, this evaluation process may be difficult to conduct due to these parameter variables (viz. structural property parameters, such as stiffness, damping, and strength, and excitation characteristics parameters, such as frequency content and duration) that are usually correlated with each other. Therefore, this study devotes to develop a method for evaluating stochastic response uncertainty involving correlated system parameter variables. In this method, the evaluation expression for the mean and standard deviation of the maximum response including uncertainty parameter variables are provided first; subsequently, a third-moment pseudo-correlation normal transformation is able to be performed for converting the correlated and non-normal system parameter variables with unknown joint probability density function (PDF) or marginal PDF into the mutually independent standard normal ones; ultimately, a point estimate procedure (PEP) based on univariate dimension reduction integration can be carried out for evaluating the structural stochastic response including uncertainty system parameters. Several numerical examples with an engineering background involving correlated system parameter variables are analyzed and discussed under stochastic excitation, and their results are compared with those yielded by Monte Carlo simulation (MCS) so as to demonstrate the effectiveness of the approach proposed. It indicated that the method proposed, in this study, provides an effective path to deal with uncertainty evaluation of stochastic structural response involving correlated random variables.
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Song, Xuemin, Weiqin Liu, and Guowei Zhang. "Research on Structural Response Characteristics of Trapezoidal Floating Body in Waves." Journal of Marine Science and Engineering 10, no. 11 (November 15, 2022): 1756. http://dx.doi.org/10.3390/jmse10111756.
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Floating structures plays an important role in extending and developing ocean resources, and their response evaluation is a hot topic of global important research due to the large dimensions. With characteristics including small depth and large horizontal plane, it is easy to induce the hydro-elastic resonant responses due to total stiffness. In this paper, first, the model design is performed to satisfy hydro-elastic similarity. Then, the model test is carried out in a wave tank to measure the structural response of a trapezoidal floating body in a series of waves. Secondly, the 3D hydro-elastic computational platform HOMER is applied to calculate the stress response of a trapezoidal floating body in numerical waves. The model test results and numerical simulation results are analyzed and compared and the conclusions are drawn, which indicate that a numerical method is effective to predict the structural response characteristics of a trapezoidal floating body. Above all, it is found that the significant response of a floating model is generated in some cases. The methods and conclusions of this study are used to provide reference and guidance for structural design of a trapezoidal floating body.
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Greco, Rita, and Francesco Trentadue. "Structural Reliability Sensitivities under Nonstationary Random Vibrations." Mathematical Problems in Engineering 2013 (2013): 1–21. http://dx.doi.org/10.1155/2013/426361.
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Response sensitivity evaluation is an important element in reliability evaluation and design optimization of structural systems. It has been widely studied under static and dynamic forcing conditions with deterministic input data. In this paper, structural response and reliability sensitivities are determined by means of the time domain covariance analysis in both classically and nonclassically damped linear structural systems. A time integration scheme is proposed for covariance sensitivity. A modulated, filtered, white noise input process is adopted to model the stochastic nonstationary loads. The method allows for the evaluation of sensitivity statistics of different quantities of dynamic response with respect to structural parameters. Finally, numerical examples are presented regarding a multistorey shear frame building.
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Ye, Zhoujing, Yang Lu, and Linbing Wang. "Investigating the Pavement Vibration Response for Roadway Service Condition Evaluation." Advances in Civil Engineering 2018 (July 8, 2018): 1–14. http://dx.doi.org/10.1155/2018/2714657.
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Dynamic response of pavement provides service condition information and helps with damage prediction, while limited research is available with the simulation of pavement vibration response for evaluating roadway service condition. This paper presents a numerical model for the analysis of the pavement vibration due to the dynamic load created by a passing vehicle. A quarter vehicle model was used for the determination of the vehicle moving load. Both random and spatial characteristics of the load were considered. The random nonuniform moving load was then introduced in a 3D finite element model for the determination of the traffic-induced pavement vibration. The validated numerical model was used to assess the effects of dynamic load, material properties, and pavement structures on pavement vibration response. Numerical analyses showed that the vibration modes changed considerably for the different roadway service conditions. The vibration signals reflect the level of road roughness, the stiffness of the pavement materials, and the integrity of pavement structure. The acceleration extrema, the time-domain signal waveform, the frequency distribution, and the sum of squares of Fourier amplitude can be potential indexes for evaluating roadway service condition. This provides recommendations for the application of pavement vibration response in early-warning and timely maintenance of road.
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Wirsching, P. H., and Y. T. Wu. "Advanced Reliability Methods for Structural Evaluation." Journal of Engineering for Industry 109, no. 1 (February 1, 1987): 19–23. http://dx.doi.org/10.1115/1.3187086.
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Approximate solutions to the general structural reliability problem, i.e., computing probabilities of complicated functions of random variables, can be obtained efficiently by the fast probability integration (FPI) methods of Rackwitz-Fiessler and Wu. Relative to Monte Carlo, FPI methods have been found by the authors to require only about 1/10 of the computer time for probability levels of about 10−3. For lower probabilities, the differences are more dramatic. FPI can also be employed in situations, e.g., finite element analyses when the relationship between variables is defined only by a numerical algorithm. Unfortunately, FPI requires an explicit function. A strategy is presented herein in which a computer routine is run repeatedly k times with selected perturbed values of the variables to obtain k solutions for a response variable Y. An approximating polynomial is fit to the k “data” sets. FPI methods are then employed for this explicit form. Examples are presented of the FPI method applied to an explicit form and applied to a problem in which a polynomial approximation is made for the response variable of interest.
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Akbari, Jalal, Leila Nazari, and Samaneh Mirzaei. "Vibration Response Evaluation under Shock-Type Loading with Emphasis on Finite Element Model Updating." Shock and Vibration 2020 (September 15, 2020): 1–13. http://dx.doi.org/10.1155/2020/8861827.
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In some cases, impulse- or shock-type excitations as the dynamic loading are inevitable, and obtaining proper response with the well-known numerical methods is not easy. This paper focuses on dynamic response estimation against short-time loading with an updated finite element model using frequency response functions (FRF) and particle swarm optimization (PSO) technique. Because there is not an analytical method for assessing the numerical responses under shock-type excitations, in this paper, experimental tests are designed on a laboratory scale to evaluate the numerical responses. The vibration responses of the system against shock loading are compared with the Newmark average acceleration scheme and also with experimental data. The results reveal that the unconditionally stable Newmark method against regular loads has an appropriate performance. Still, under short-time loading, it faces numerical damping error, and this method should not be blindly applied under shock-type loads.
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Tahmasebinia, Faham, Linda Zhang, Sangwoo Park, and Samad Sepasgozar. "Numerically Evaluation of FRP-Strengthened Members under Dynamic Impact Loading." Buildings 11, no. 1 (December 31, 2020): 14. http://dx.doi.org/10.3390/buildings11010014.
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Reinforced concrete (RC) members in critical structures, such as bridge piers, high-rise buildings, and offshore facilities, are vulnerable to impact loads throughout their service life. For example, vehicle collisions, accidental loading, or unpredicted attacks could occur. The numerical models presented in this paper are shown to adequately replicate the impact behaviour and damage process of fibre-reinforced polymer (FRP)-strengthened concrete-filled steel tube (CFST) columns and Reinforced Concrete slabs. Validated models are developed using Abaqus/Explicit by reproducing the results obtained from experimental testing on bare CFST and RC slab members. Parameters relating to the FRP and material components are investigated to determine the influence on structural behaviour. The innovative method of using the dissipated energy approach for structural evaluation provides an assessment of the effective use of FRP and material properties to enhance the dynamic response. The outcome of the evaluation, including the geometrical, material, and contact properties modelling, shows that there is an agreement between the numerical and experimental behaviour of the selected concrete members. The experimentation shows that the calibration of the models is a crucial task, which was considered and resulted in matching the force–displacement behaviour and achieving the same maximum impact force and displacement values. Different novel and complicated Finite Element Models were comprehensively developed. The developed numerical models could precisely predict both local and global structural responses in the different reinforced concrete members. The application of the current numerical techniques can be extended to design structural members where there are no reliable practical guidelines on both national and international levels.
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Kubic, Charles. "Evaluation of Dynamic Analysis Methods for Seismic Analysis of Drydocks." Marine Technology Society Journal 43, no. 1 (March 1, 2009): 73–92. http://dx.doi.org/10.4031/mtsj.43.1.12.
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AbstractThree numerical methods are used to model the structural response of Bremerton drydock no. 6 to the 2001 Nisqually earthquake. The models considered include: (1) a numerical linear-elastic soil response model, (2) a numerical non-linear time-history response model, and (3) a non-linear finite element model. The results of the models are compared to the observed drydock response and each other in order to determine their effectiveness in modeling drydock structures. The research demonstrated that the non-linear finite element program PLAXIS is suitable for the seismic analysis of drydocks. In addition, the research showed that the existing United States Army Corps of Engineers program CorpsWallROTATE is not suited for the dynamic analysis of drydocks; while a method developed by Wood in 1973 could be further developed to be used as a linear approximation of the drydock’s time-history seismic response. The research is presented to assist in the development of comprehensive seismic drydock design standards.
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Huang, Qianwen, Xinping Yan, and Cong Zhang. "Numerical calculation and experimental research on the ship dynamics of the fluid–structure interaction." Advances in Mechanical Engineering 10, no. 7 (July 2018): 168781401878234. http://dx.doi.org/10.1177/1687814018782347.
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Accurate predictive method for ship dynamic is a keynote precondition for structural design and an important consideration for strength evaluation. A wave-ship coupling model focusing on the estimating of ship dynamics is numerically established to solve the fluid–structure interaction. Numerical calculation based on the presented algorithm is carried out, and the dynamical response for both ship and fluid is thus investigated with MATLAB. The dynamical responses including the structural force, deformation, velocity, and energy with different ship mass and stiffness are obtained. Experiment is conducted in the towing tank to investigate the peak frequency and transient amplitude with different wave speeds. It is found that the ship dynamics is closely related to the quality and stiffness of the structure, as well as the wave velocity of the fluid. An appropriate estimating method for ship dynamics is thus proposed through series of discussion on numerical results and experimental data.
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Dong, Jing, Junhai Zhao, and Dongfang Zhang. "Numerical Evaluation of Reinforced Concrete Columns Retrofitted with FRP for Blast Mitigation." Advances in Civil Engineering 2020 (September 16, 2020): 1–14. http://dx.doi.org/10.1155/2020/8884133.
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Fiber reinforced polymer (FRP) material is commonly applied in retrofitting structures due to the advantages of high strength and well corrosion resistance. Previous studies indicated that retrofitting with FRP sheet was an effective way for protecting the existing structures to resist the blast loads, but little research made comprehensive comparison study on the blast response of RC columns with different retrofitting strategies. This paper proposed a series of FRP retrofitting strategies and evaluated their effect on blast mitigation using numerical analysis approach. Comparison studies were conducted on the effect of FRP type, FRP thickness, and retrofitting mode on blast mitigation. A finite element model of RC columns retrofitted with FRP under blast loading was developed. The model considered the strain rate effect of steel and concrete and the orthotropic property of FRP composites. The reliability of the proposed model was validated against the data from a field blast test. Based on the verified model, the blast responses of RC columns with different retrofitting strategies were numerically investigated. According to the result analysis, appropriate FRP type, FRP thickness, retrofitting mode, and retrofitting length were recommended.
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Sadhu, Ayan, Sandeep Sony, and Peter Friesen. "Evaluation of progressive damage in structures using tensor decomposition-based wavelet analysis." Journal of Vibration and Control 25, no. 19-20 (July 11, 2019): 2595–610. http://dx.doi.org/10.1177/1077546319861878.
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Effective monitoring and retrofitting of large-scale infrastructure subjected to natural hazards such as strong wind, severe earthquakes or man-made excitation are critical to ensure structural integrity and prevent any premature failure. With the aid of structural health monitoring, it is now possible to acquire rich vibration data, estimate the hidden structural information, and evaluate the existing structural performance. The nonstationary component of vibration response resulting from natural hazards poses difficulty in analysis using traditional modal identification methods that are based on the stationarity assumption of vibration response. Apart from the excitation-induced nonstationarity, inherent damages in the structure also cause frequency-dependent nonstationarity in the response. With such a combination of both amplitude and frequency-dependent nonstationary response, the modal identification becomes a significantly challenging task. In this paper, Cauchy continuous wavelet transform is integrated with the tensor decomposition to track time-varying characteristics of modal responses and detect any progressive damage. The proposed technique is validated using a suite of numerical studies as well as a laboratory experiment where the progressive damage is simulated in the members by heating them using a butane torch. Unlike detection of discrete damage, the proposed method is one of introductory approaches to assess progressive damage in structures.
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Ouhimmou, S., A. El Hami, Rachid Ellaia, and M. Tkiouat. "Approximate Solution of the Structural Problems Using Probabilistic Transformation." Key Engineering Materials 446 (July 2010): 91–99. http://dx.doi.org/10.4028/www.scientific.net/kem.446.91.
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The aim of this paper is to present a new methodology for the evaluation of the statistical proprieties of the response of structures, based on The Finite Element Analysis (FEA) coupled with the Probabilistic Transformation Method (PTM). Uncertainty modelling with random variables motivates the adoption of advanced PTM for reliability analysis to solve problems of mechanical systems. The PTM is readily applicable in the case where the expression between input and output of structures are available in explicit analytical form. However, the situation is much more involved when it is necessary to perform the evaluation of implicit expression between input and output of structures through numerical models. For this we propose technique that combines the FEA software, and the PTM program to evaluate the Probability Density Function (PDF) of the response where the expression between input and output of structures is implicit. This technique is based on the numerical simulations of the FEA and the PTM by making an interface between Finite Element software and Matlab. Some problems of structures are treated in order to demonstrate the applicability of the proposed technique.
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Wei, Lejun, Yinfeng Dong, and Hui Tian. "Prediction of structural dynamic response based on transfer function." Vibroengineering PROCEDIA 43 (June 13, 2022): 34–38. http://dx.doi.org/10.21595/vp.2022.22588.
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The dynamic response of structures under strong ground motion is a crucial information to study and analyze the seismic performance of structures. The dynamic response of the structure to earthquake action is an important foundation for analyzing and evaluating the structure’s seismic performance. For structures having design information, finite element numerical simulation can be calculated to assess the target building’s structural dynamic response. However, because a finite element model cannot be established for a structure without detailed design information, the dynamic response of the structure cannot be calculated by finite element numerical simulation. Therefore, this paper will develop a structural response prediction model based on the transfer function and use the prediction model to determine the structure’s dynamic reaction. The obtained structural reaction prediction values are equivalent to the numerical simulation estimates, according to the prediction results. The purpose of this paper is to present a new analytical method for assessing the structural response of buildings in the lack of design data.
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John, V. Chandy, M. G. Satish, and D. H. Waller. "Development and evaluation of numerical hydrodynamic models for small lakes and reservoirs." Canadian Journal of Civil Engineering 22, no. 2 (April 1, 1995): 270–82. http://dx.doi.org/10.1139/l95-036.
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The response of a small lake or reservoir system to wind and streamflow forcing is examined in this paper using a numerical model based on Navier–Stokes equation and a numerical hydraulic model using the segment-node approach. The main mass transport in the lake has been found to be due to wind; the circulation caused by stream inflow and outflow of the lake contributes a relatively small fraction of the total transport. The above-mentioned models have been applied to different wind regimes and constant or variable inflow–outflow conditions of Long Lake (Nova Scotia). Comparisons are made between observed data and model results by both models. The model response has also been studied for generation of seiches and wind setup in the lake; and the response of the lake to these forcing functions has been presented. The comparison of model results with in situ field data establishes model's suitability to make predictions. Drogue and water level measurements were made at a number of locations in the Long Lake to validate the numerical models. The results from the numerical simulation using the two models compare favourably with the observed data. As may be expected, the segment-node modelling scheme was found to be computationally more efficient and relatively easy to run on a personal computer. Key words: numerical model, hydrodynamics, circulation, Long Lake, temperature, dissolved oxygen, stratification, Nova Scotia.
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Tuswan, Tuswan, Achmad Zubaydi, Bambang Piscesa, Abdi Ismail, Rizky Chandra Ariesta, and Aditya Rio Prabowo. "A numerical evaluation on nonlinear dynamic response of sandwich plates with partially rectangular skin/core debonding." Curved and Layered Structures 9, no. 1 (October 18, 2021): 25–39. http://dx.doi.org/10.1515/cls-2022-0003.
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Abstract As one of the most dangerous defects in the sandwich panel, debonding could significantly degrade load carrying capacity and affect dynamic behaviour. The present work dealt with debonding detection of the rectangular clamped hybrid sandwich plate by using ABAQUS software. The influence of various damage ratios on the linear and nonlinear dynamic responses has been studied. The finite element model was initially validated by comparing the modal response with the experimental test. Rectangular debonding was detected by comparing dynamic responses of free and forced vibrations between intact and debonded models. A wide range of driving frequency excitation corresponding to transient and harmonic concentrated loads was implemented to highlight nonlinear behaviour in the intermittent contact in the debonded models. The results showed that debonding existence contributed to the natural frequency reduction and modes shape change. The numerical results revealed that debonding affected both the steady-state and impulse responses of the debonded models. Using the obtained responses, it was detected that the contact in the debonded region altered the dynamic global response of the debonded models. The finding provided the potential debonding diagnostic in ship structure using vibration-based structural health monitoring.
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Wang, Yinan, and Fu-Kuo Chang. "Numerical and experimental evaluation of mechanical performance of the multifunctional energy storage composites." Journal of Composite Materials 56, no. 2 (November 7, 2021): 199–212. http://dx.doi.org/10.1177/00219983211049504.
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This work presents numerical simulation methods to model the mechanical behavior of the multifunctional energy storage composites (MESCs), which consist of a stack of multiple thin battery layers reinforced with through-the-hole polymer rivets and embedded inside carbon fiber composite laminates. MESC has been demonstrated through earlier experiments on its exceptional behavior as a structural element as well as a battery. However, the inherent complex infrastructure of the MESC design has created significant challenges in simulation and modeling. A novel homogenization technique was adopted to characterize the multi-layer properties of battery material using physics-based constitutive equations combined with nonlinear deformation theories to handle the interface between the battery layers. Second, mechanical damage and failure modes among battery materials, polymer reinforcements, and carbon fiber-polymer interfaces were characterized through appropriate models and experiments. The model of MESCs has been implemented in a commercial finite element code in ABAQUS. A comparison of structural response and failure modes from numerical simulations and experimental tests are presented. The results of the study showed that the predictions of elastic and damage responses of MESCs at various loading conditions agreed well with the experimental data. © 2021
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Byun, Namju, Jeonghwa Lee, Joo-Young Won, and Young-Jong Kang. "Structural Responses Estimation of Cable-Stayed Bridge from Limited Number of Multi-Response Data." Sensors 22, no. 10 (May 14, 2022): 3745. http://dx.doi.org/10.3390/s22103745.
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A cable-stayed bridge is widely adopted to construct long-span bridges. The deformation of cable-stayed bridges is relatively larger than that of conventional bridges, such as beam and truss types. Therefore, studies regarding the monitoring systems for cable-stayed bridges have been conducted to evaluate the performance of bridges based on measurement data. However, most studies required sufficient measurement data for evaluation and just focused on the local response estimation. To overcome these limitations, Structural Responses Analysis using a Limited amount of Multi-Response data (SRALMR) was recently proposed and validated with the beam and truss model that has a simple structural behavior. In this research, the structural responses of a cable-stayed bridge were analyzed using SRALMR. The deformed shape and member internal forces were estimated using a limited amount of displacement, slope, and strain data. Target structural responses were determined by applying four load cases to the numerical model. In addition, pre-analysis for initial shape analysis was conducted to determine the initial equilibrium state, minimizing the deformation under dead loads. Finally, the performance of SRALMR for cable-stayed bridges was analyzed according to the combination and number of response data.
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Trimiño, Luis F., and Duane S. Cronin. "Evaluation of Numerical Methods to Model Structural Adhesive Response and Failure in Tension and Shear Loading." Journal of Dynamic Behavior of Materials 2, no. 1 (February 1, 2016): 122–37. http://dx.doi.org/10.1007/s40870-016-0045-7.
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Li, Bo, Bo Chen, and Chun Xia. "Dynamic Energy of a Large Scale Transmission Tower Subjected to Wind Excitations." Advanced Materials Research 383-390 (November 2011): 3645–51. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3645.
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Evaluation on energy characteristics of a wind-excited transmission tower-line system is actively carried out in this study. The analytical method of a transmission tower-line system is established. The evaluation criteria of energy responses is developed and applied to the wind response analysis of a transmission tower. A real transmission tower-line system constructed in China is taken as an example to examine the feasibility and reliability of the proposed approach. The observations from numerical investigation indicate that the proposed energy evaluation criteria can be effectively utilized in the examination on structural dynamic performance.
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Ebrahimi, Samira, Seyed Mehdi Zahrai, and Seyed Rasoul Mirghaderi. "Cyclic Performance Evaluation of Hollow Structural Section (HSS) and Concrete-Filled Tube (CFT) Braces." International Journal of Structural Stability and Dynamics 19, no. 11 (October 23, 2019): 1950140. http://dx.doi.org/10.1142/s0219455419501402.
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Hollow structural sections (HSS) are widely used as braces because they have inherent axial, flexural, and torsional capacities. Delaying or preventing local buckling is accomplished by concrete infill in HSS braces to improve their cyclic response heavily relying upon three key parameters: (1) presence of concrete infill, (2) width (diameter)-to-thickness ratio, and (3) length-to-width (diameter) ratio impress the cyclic response of HSS braces. Nevertheless, it is not clear that based on which parameter, concrete infill can significantly enhance the peak compressive strength and energy dissipation capacity of HSS braces. This paper aims to investigate this concern while presenting a numerical study on the cyclic response of 120 HSS and Concrete-Filled Tubes (CFT) braces with various geometric characteristics. Square and circular cross-sections, 10, 12, 13.33, 20, 30, 33.33, and 50 width (diameter)-to-thickness ratios and 10, 15, 20, 25, 30, 37.5, 45, 50, 75, and 112.5 length-to-width (diameter) ratios are selected for the numerical investigation. Obtained results indicated that concrete infill can increase peak compressive and post-buckling strengths and energy dissipation capacity of HSS braces around 81%, 43%, and 73%, respectively. It was found that concrete infill and parameters of width (diameter)-to-thickness ratio and length-to-width (diameter) ratio influence the cyclic response of HSS braces differently. On the other hand, concrete infill noticeably enhances the peak compressive strength of HSS braces with larger values of width (diameter)-to-thickness ratio and energy dissipation capacity of such braces with lower values of length-to-width (diameter) ratio.
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LIVAOGLU, RAMAZAN, ALPER TURAN, M. HESHAM EL NAGGAR, and ADEM DOGANGUN. "THE NUMERICAL AND EMPIRICAL EVALUATION OF STRUCTURAL PERFORMANCE OF ELEVATED TANKS CONSIDERING SOIL–STRUCTURE INTERACTION EFFECTS." Journal of Earthquake and Tsunami 06, no. 02 (June 2012): 1250008. http://dx.doi.org/10.1142/s179343111250008x.
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Water tanks are an essential lifeline whose continuing availability and serviceability immediately after earthquake events are crucial for providing undisrupted emergency services. Their seismic performance is, therefore, of paramount importance. The seismic response of an elevated liquid tank situated on a soft soil deposit was studied by means of field vibration tests and numerical simulations. The ambient and forced vibration tests were conducted to identify the soil–structure interaction (SSI) effects on the small strain dynamic behavior of the structure. A series of time domain numerical analyses were performed to evaluate the seismic performance of these structures from a performance based design point of view. The results showed that consideration of SSI increased the displacement demand significantly. Thus, the calculated maximum displacement demand for supporting frame components of the tank may be underestimated significantly when the SSI effects are neglected. In addition, the seismic induced shear forces considering SSI effects were much smaller than the seismic shear forces for the fixed based case. For some soil types, the effect of this reduction on the overall response may become more prominent than the structural ductility mechanism. This resulted in the failure mechanism being initiated by a coupled compression — bending moment effect, rather than shear failure. Finally, the sloshing response is significantly increased due to the SSI.
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Li, Bailong, Changming Wang, Yanying Li, and Shuhua Zhang. "Dynamic Response Study of Impulsive Force of Debris Flow Evaluation and Flexible Retaining Structure Based on SPH-DEM-FEM Coupling." Advances in Civil Engineering 2021 (October 23, 2021): 1–12. http://dx.doi.org/10.1155/2021/9098250.
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Flexible retaining structure is demonstrated to be an effective measure for debris flow prevention in mountainous areas, which can effectively separate water and stone, reduce particle mass, and dissipate kinetic energy. In order to explore the impulsive force and dynamic response of flexible retaining structure impacted by solid-liquid two-phase debris flow, a complex dynamic interaction model of particle-fluid-structure has been established by employing the SPH-DEM-FEM coupling numerical analysis method. In the present study, the process, impulse force, and dynamic response of a flexible retaining structure subjected to debris flow under different slopes were investigated, respectively. The numerical results are compared with those of the calculation formula of the peak impulsive force of the semiempirical debris flow. Meanwhile, the effectiveness of the coupling numerical simulation is verified. The simulation results show that the coupled SPH-DEM-FEM numerical analysis method can visualise the impact of the solid-liquid two-phase debris flow on the flexible retaining structure, reproducing the impact, retaining, water-stone separation, climbing, silting, and deposition process of debris flow. The dynamic time-history curve of the coupling numerical analysis method for the flexible retaining structure is consistent with the results of the existing literature. The debris flow evaluation results of flexible retaining structure impacted by solid-liquid two-phase debris flow are in an order of magnitude with the empirical formula results. Moreover, the results are reliable. The obtained results have a certain reference value for the study on the impulsive force and dynamic response of the flexible retaining structure impacted by solid-liquid two-phase debris flow and the engineering design of the flexible retaining structure.
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Hwang, Se-Yun, and Jang-Hyun Lee. "The Numerical Investigation of Structural Strength Assessment of LNG CCS by Sloshing Impacts Based on Multiphase Fluid Model." Applied Sciences 11, no. 16 (August 12, 2021): 7414. http://dx.doi.org/10.3390/app11167414.
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Sloshing flows of liquid natural gas (LNG) with multi-phase flow characteristics consisting of liquids and gases can affect the load conditions and structural response of cargo containment systems (CCS). The compressible properties of the sloshing flow can limit the maximum pressure, so a multi-phase fluid model is required to represent the sloshing physics. In this study, we identified a suitable numerical model to simulate the sloshing flow and structural strength evaluation based on the inhomogeneous fluid model. The computational fluid dynamics (CFD) is based on a Eulerian domain model, which is in turn based on the constant volume based finite element method (CVFEM) in a commercial Reynolds-averaged Navier–Stokes CFD code (ANSYS CFX). It includes the interphase momentum transfer between the liquids and gasses. The physics for the sloshing assessment were considered to identify the main aspects of the inhomogeneous multiphase model. For numerical analysis of the sloshing, we conducted a sloshing simulation on the experimental data of the model scale to examine the validity of the results. The velocity of the sloshing flow was extended to the real scale and applied to a local two-way fluid structure interaction (FSI) analysis model. Structural strength evaluation of the LNG CCS by sloshing flow was performed by FSI analysis. Through the example of structural response analysis of Mark III type CCS, the results were discussed and effectiveness of the proposed structural response assessment model by sloshing was reviewed.
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Jeong, Seong-Hoon, Won-Seok Jang, Jin-Won Nam, Hohyun An, and Dae-Jin Kim. "Development of a Structural Monitoring System for Cable Bridges by Using Seismic Accelerometers." Applied Sciences 10, no. 2 (January 20, 2020): 716. http://dx.doi.org/10.3390/app10020716.
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In this study, a structural health monitoring system for cable-stayed bridges is developed. In the system, condition assessment of the structure is performed based on measured records from seismic accelerometers. Response indices are defined to monitor structural safety and serviceability and derived from the measured acceleration data. The derivation process of the indices is structured to follow the transformation from the raw data to the final outcome. The process includes, noise filtering, baseline correction, numerical integration, and calculation of relative differences. The system is packed as a condition assessment program, which consists of four major process of the structural health evaluation: (i) format conversion of the raw data, (ii) noise filtering, (iii) generation of response indices, and (iv) condition evaluation. An example set of limit states is presented to evaluate the structural condition of the test-bed cable-stayed bridge.
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Kodur, Venkatesh, and Ankit Agarawal. "A numerical approach for evaluating residual capacity of fire damaged concrete members." Revista ALCONPAT 10, no. 2 (April 30, 2020): 230–42. http://dx.doi.org/10.21041/ra.v10i2.483.
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This paper presents an approach to evaluate residual capacity of fire-damaged concrete structures. The approach involves capturing response in three stages; namely, structural response at ambient conditions (prior to fire exposure), thermo-mechanical response during fire exposure, and post-fire residual response after cooling down of the structural member. The proposed approach is implemented in a comprehensive numerical model developed in the finite element computer program ABAQUS for specifically evaluating residual capacity of an RC beam after exposure to different fire scenarios. Predictions from the numerical model are utilized to highlight importance of each stage of analysis in evaluating realistic residual capacity of fire damaged concrete members.
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Dahmani, Lahlou, and Rachid Mehaddene. "Thermomecanical Response of LNG Concrete Tank to Cryogenic Temperatures." Defect and Diffusion Forum 312-315 (April 2011): 1021–26. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.1021.
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In this paper are illustrated the principal aspects connected with the numerical evaluation of thermal stress induced by LNG (liquefied natural gas) in a concrete tank. In order to investigate the thermal induced tensile stresses, the ANSYS finite element code has been employed for performing a sequential, non linear, transient thermal-structural analysis, taking into account the thermal dependant properties of the concrete such as thermal conductivity and specific heat. Temperature distribution data of thermal analysis is required in the coupled field analysis finally to obtain and analyze thermal stresses.
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Yussof, Mustafasanie M., Jordan Halomoan Silalahi, Mohd Khairul Kamarudin, Pei-Shan Chen, and Gerard A. R. Parke. "Numerical Evaluation of Dynamic Responses of Steel Frame Structures with Different Types of Haunch Connection Under Blast Load." Applied Sciences 10, no. 5 (March 6, 2020): 1815. http://dx.doi.org/10.3390/app10051815.
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This research is aimed at investigating the dynamic behaviour of, and to analyse the dynamic response and dynamic performance of steel frames strengthened with welded haunches subjected to a typical hydrocarbon blast loading. The structural dynamic analysis was carried out incorporating the selected blast load, the validated 3D model of the structures with different welded haunch configurations, steel dynamic material properties, and non-linear dynamic analysis of multiple degree of freedom (MDOF) structural systems. The dynamic responses and effectiveness of the reinforced connections were examined using ABAQUS finite element software. Results showed that the presence of the welded haunch reinforcement decreased the maximum frame ductility ratio. Based on the evaluation of the results, the haunch reinforcements strengthened the selected steel frame and improved the dynamic performance compared to the frame with unreinforced connections under blast loading, and the biggest haunch configuration is the “best” type.
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Wang, Xi Peng, Heng Zou, Bing Qian Yang, Feng Zhu, and Ying Geng. "Numerical Analysis of Water Intake Tower Structure for Safety Evaluation and Reliable Test." Advanced Materials Research 864-867 (December 2013): 2318–21. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.2318.
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Based on finite element platform ANSYS, This paper focus on the displacement and the stress response under the static loads forced on the water intake tower structure. Research including describe the distribution of displacement and stress on the structure under gravity load in the finishing construction period, And the structural stress and displacement during the working period. The calculation results show that, in the design of reasonable conditions, the main structure can meet the requirements of safety, but some high stress at some local place, which can be improved by other methods.
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Feng, Chunlei, Dingli Zhang, Hualao Wang, and Xuan Zhang. "Deformation Response and Safety Evaluation of Buildings Affected by Subway-Station Construction." Advances in Civil Engineering 2021 (June 8, 2021): 1–18. http://dx.doi.org/10.1155/2021/1694563.
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Based on the sand and pebble stratum in the Beijing area, this paper studies the interaction between deep-foundation-pit excavation for subway stations and surrounding buildings using an orthogonal test. Moreover, it considers the relative position relationship between buildings and how the foundation pit is set up as well as different design schemes for foundation pits and the surrounding buildings. Results show that the horizontal distance s between the building and foundation pit and stiffness of the building itself have a clear impact on the differential settlement δij and relative deflection Δ, and the degree of deformation of the building near the corner of the foundation pit is complex. Simultaneously, based on numerical simulation results, the deformation characteristics and degree of deformation of the building under different relative position relationships with the foundation pit are analyzed. Finally, by establishing a relationship among the comprehensive deformation index Dj, surrounding environmental safety evaluation index Sj, and scheme safety grade Lj, a multiangle safety evaluation method for buildings affected by foundation-pit construction is formed, which can provide a reference for the research and design of similar projects.
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Mai, Van Thien, Neil Hoult, and Ian Moore. "Numerical evaluation of a deeply buried pipe testing facility." Advances in Structural Engineering 21, no. 16 (July 25, 2018): 2571–88. http://dx.doi.org/10.1177/1369433218783769.
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A new facility for testing pipes under deep burial has been developed. However, before the facility was commissioned, the influence of the loading scheme and boundary conditions on the pipe behaviour was investigated so that the most appropriate experimental setup could be developed. Two- and three-dimensional finite element analyses were used to assess the impact of the top and side boundary conditions on both flexible and rigid pipes with varying diameters. The vertical overburden pressures expected in the field are simulated using actuators applying vertical forces to two steel grillages. The numerical results show that the use of two independent grillages on the surface produced a more uniformly distributed ‘overburden’ pressure, a novel approach that performs significantly better than previous loading systems. Proximity of the test facility’s walls to the pipes was also investigated and found to have less than a 0.2% impact on pipe response when compared to simulations of field geometries. Results examining five different approaches to reducing the effect of sidewall friction were compared to the case of zero friction (i.e. the field case), and it was found that while lubricating the wall to create a friction angle of 5° over the full height produced the most accurate results, lubrication of only the top 2.5 m of the wall also produces thrust forces and bending moments within 10% of values from the zero-friction case. Finally, the effect of the position of the pipe within the test cell was investigated, where pipe testing with 0.3 m of bedding is expected to produce results like those for pipes close to rock foundations in the field. These results are already being used to inform testing procedures using this unique facility.
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Advani, S. H., T. S. Lee, and J. K. Lee. "Three-Dimensional Modeling of Hydraulic Fractures in Layered Media: Part I—Finite Element Formulations." Journal of Energy Resources Technology 112, no. 1 (March 1, 1990): 1–9. http://dx.doi.org/10.1115/1.2905706.
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A comprehensive model represented by a set of equations governing the mechanics of planar hydraulic fracture propagation in a multi-layered reservoir is presented. A general-purpose integral formulation for the formation elasticity is developed along with a numerical scheme for mode I fracture response evaluation of an arbitrarily shaped planar pressurized crack in a layered medium. Non-Newtonian fluid flow in the hydraulically induced fracture is governed by a two-dimensional nonlinear partial differential equation. Finite element formulations for the governing equations as well as calibrative examples illustrating the computational features of the model are presented. Numerical schemes for determining the moving fracture front and coupling of the fluid flow and structural/fracture responses are also developed.
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Fruchter, Renate, Helmut Krawinkler, and Kincho H. Law. "Qualitative modeling and analysis of lateral load resistance in frames." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 7, no. 4 (November 1993): 239–56. http://dx.doi.org/10.1017/s0890060400000342.
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This paper discusses a work in progress in the development of computer tools for qualitative modeling analysis and evaluation of conceptual structural designs. In the conceptual design stage the description of a structure is incomplete and imprecise, and does not permit the use of traditional numerical analysis tools. We describe a prototype system, QLRS, for qualitative evaluation of lateral load resistance in frames. The primary goal of the evaluation of structural response is to identify undesirable structural behavior. In QLRS, the evaluation process consists of three basic tasks. (1) identification of the story and structure models comprising the lateral load resisting system. We term this task structural system interpretation. (2) Qualitative analysis of the story and structure models, and approximate evaluation of the story drifts. We term this task structural behavior interpretation. (3) Assessment of the performance of the lateral load resisting system, in which the results of the structural system interpretation and the structural behavior interpretation are compared against the requirements for complete load path and relative story drift. Currently, QLRS is able to reason about load path discontinuities and soft-story behavior problems in 2-D moment resisting frames.
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Aminitabar, Meysam, Omar Kanaani, and Amir Reza Eskenati. "Numerical Evaluation of the Opening Effects on the Reinforced Concrete Slab Structural Performance." Shock and Vibration 2021 (October 18, 2021): 1–16. http://dx.doi.org/10.1155/2021/1060841.
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A finite element method was used in this study to investigate the effects of openings on the resistive behavior of concrete slabs. The presented modeling procedure is used to conduct numerical analyses on the response of reinforced concrete slab subjected to in-plane monotonic loads in X (perpendicular to the beam) and Z (parallel to the beam) directions. Initially, the developed numerical model was calibrated and compared with laboratory results. In building this three-dimensional model, it is attempted to accurately model all nonlinear properties of steel and concrete materials as well as the interactions between them. Then, the behavior of bilaterally concrete slabs under different loads was investigated and used as a reference. Finally, the effect of openings under different loads on the strength of concrete slabs was studied. The results confirm that openings have a great influence on the change of hardness, ductility, initiation and cracking path, and stress distribution under shear and gravitational loading. Moreover, by adding an opening inside the diaphragm, not only did beam and block flooring show more fragile behavior, but also its strength and resistance decreased against lateral load. Given the results of the parametric study of the effect of layout, generally, its place became critical at the state that opening disturbed transmission of shear stresses to the collector beams. By adding the area of the opening and loading in X direction, the concentration of the tensile stresses (equivalent to main maximum stresses) was at the tensile edge as well as at the middle of the flooring around the opening. It is worth noting that an increase in the opening’s area caused the number of tensile stresses to be increased at the middle of the flooring. Meanwhile, the concentration of maximum compressive stresses which is equivalent to the main minimum stresses was at the compressive edge, started at the area of the collectors, and stretched to the edge of the opening. Among different layouts, X-1 and Z-3 states were more critical than other states. Considering openings with different layouts, X-1 and Z-3 have the most stiffness deteriorating and strength in such a way that stiffness deteriorating and strength were 39.93% and 37.89%, respectively, for Z-3 model and 38.68% and 43.33%, respectively, for Z-3 model.
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Kwag, Shinyoung, YongHee Ryu, and Bu-Seog Ju. "Efficient Seismic Fragility Analysis for Large-Scale Piping System Utilizing Bayesian Approach." Applied Sciences 10, no. 4 (February 23, 2020): 1515. http://dx.doi.org/10.3390/app10041515.
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In the event of an earthquake, it is essential to accurately assess the seismic fragility of piping systems to ensure the continued safety of society. When evaluating the seismic fragility of a piping system, which is generally a secondary structural system, this should mainly be an integrated model that includes both the primary structural frames and the secondary ones, unlike the primary structural system of a building. Hence, the piping seismic fragility evaluation has an issue in that it takes considerable computational time because numerical analyses must be performed on a relatively complex model. Given this background, the purpose of this study is to propose an efficient piping seismic fragility analysis method by utilizing the existing seismic fragility analysis method and the Bayesian updating concept. In order to verify the validity of the proposed method, it was applied to a building–piping coupled structural system example, and its results were analyzed and compared with the results of the existing method in terms of accuracy and efficiency. As a result, the proposed method showed a similar accuracy compared with the existing method while significantly reducing the numerical cost of nonlinear seismic response analyses necessary for these results.
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Ashtari, Payam, Mohammad Rahnemoun, and Irandokht Rasouli. "Experimental and numerical evaluation of innovated T-resisting frames with haunched horizontal plate girders." Advances in Structural Engineering 23, no. 8 (January 20, 2020): 1669–82. http://dx.doi.org/10.1177/1369433219898082.
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In this article, a novel configuration for innovated T-resisting frames is proposed. New configuration uses haunched beams with three configurations as horizontal plate girders with prismatic link beam. Using haunched beams confirms T-resisting frame main concept with shear yielding which results in better seismic performance. Haunch configuration leads to achieve any link length ratio especially for very short links. To evaluate seismic response of the haunched beam, a half scale T-resisting frame specimen with haunched configuration at side column face is subjected to a proper cyclic loading protocol. In addition, the same frame is modeled in ABAQUS software to validate the modeling techniques. Results of verification showed good conformity between numerical analysis and test result. Finally, several numerical examples are studied to investigate the effect of height and span length on T-resisting frames with different haunch locations and various link lengths in seismic response. It was found that shear yielding of haunched beams results in high ductility and more energy dissipation and a proper behavior in comparison with prismatic ones.
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MARANO, GIUSEPPE CARLO, GIUSEPPE ACCIANI, and LENONARDO GIUSEPPE CASCELLA. "NON-STATIONARY NUMERICAL COVARIANCE ANALYSIS OF LINEAR MULTI DEGREE OF FREEDOM MECHANICAL SYSTEM SUBJECT TO RANDOM INPUTS." International Journal of Computational Methods 04, no. 01 (March 2007): 173–94. http://dx.doi.org/10.1142/s0219876207001072.
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Structural response of linear multi degree of freedom (MDoF) system subject to random Gaussian dynamic actions is defined by mean of vector and covariance matrix in state space. In case of non-stationary inputs, second-order spectral moments evaluation needs the solution of the so-called Lyapunov matrix differential equation. In this work a numerical scheme for its resolution is proposed, with reference to input processes modeled as linear filtered white noise with time-varying parameters, which is a common situation in amplitude and frequency variable loads. Numerical computational effort is minimized by taking into account symmetry characteristic of state space covariance matrix. As application of the proposed method a multi-storey building is analyzed to obtain reliability associated to maximum inter-storey exceeded over a given acceptable limit. It is assumed to be subject to seismic input described by a amplitude and frequency nonstationary process, by using a generalized non-stationary Kanai Tajimi seismic model. Structure is assumed as a plane shear frame MDoF system. Structural reliability evaluation is referred to "first time out-crossing" and different numerical benchmarks are considered.
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Brunesi, E., R. Nascimbene, and S. Peloso. "Evaluation of the Seismic Response of Precast Wall Connections: Experimental Observations and Numerical Modeling." Journal of Earthquake Engineering 24, no. 7 (May 7, 2018): 1057–82. http://dx.doi.org/10.1080/13632469.2018.1469440.
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Khatiwada, S., N. Chouw, and J. W. Butterworth. "Evaluation of numerical pounding models with experimental validation." Bulletin of the New Zealand Society for Earthquake Engineering 46, no. 3 (September 30, 2013): 117–30. http://dx.doi.org/10.5459/bnzsee.46.3.117-130.
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Pounding damage in major earthquakes has been observed frequently in the form of aesthetic, minor or major structural cracks and collapse of buildings. These observations have attracted many numerical and experimental studies that led to analytical models for simulating seismic pounding. This study considers pounding between two steel portal frames without a seismic gap. The first frame has a constant natural period while the second frame has variable stiffness and mass values. Five different ground motions are applied to eight combinations of adjacent frames using a shake table. Numerical simulations for the same configurations are carried out with five pounding force models, viz. linear viscoelastic model, modified linear viscoelastic model, nonlinear viscoelastic model, Hertzdamp model and modified Hertzdamp model. The contact element stiffness and coefficient of restitution for numerical models are determined experimentally. The amplification of maximum displacement of the first frame predicted by the numerical simulations is compared with the shake table results. It was found that the Hertzdamp model always overestimated the responses while the other four models also frequently overestimated the amplifications. The predictions from the four models were not significantly different. Since the linear viscoelastic model requires substantially less computation, compared with the other models this model is more suitable for numerical modelling of pounding responses. However, more study is required to refine the numerical models before building pounding can be modelled with enough confidence.
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Muramatsu, T. "Numerical Analysis of Nonstationary Thermal Response Characteristics for a Fluid-Structure Interaction System." Journal of Pressure Vessel Technology 121, no. 3 (August 1, 1999): 276–82. http://dx.doi.org/10.1115/1.2883703.
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Nonstationary thermal response analysis for a fundamental sodium experiment simulating thermal striping phenomena was carried out using a quasi-direct numerical thermohydraulics simulation code with a third-order upwind scheme for convection terms and a boundary element method code for thermal response evaluation of structures due to random sodium temperature fluctuations developed at Power Reactor and Nuclear Fuel Development Corporation (PNC). Discussions centered on an applicability of the numerical method for the damping effects of the temperature fluctuations in the course of heat transfer to the inside of structures from the fully turbulent region of sodium flows through the comparisons with the experiment. From these comparisons, it was confirmed that the numerical method has a sufficiently high potential in accuracy to predict the damping effects of the temperature fluctuations related to the thermal striping phenomena. Consequently, it is concluded that the numerical prediction by the method developed in this study can replace conventional experimental approaches using 1:1 or other scale model aiming at the simulation of the thermal striping phenomena in actual liquid metal fast breeder reactor (LMFBR) plants. Furthermore, economical improvements in the FBR plants can be carried out based on the discussions of optimization and rationalization of the structural design using the numerical methods.
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Zhao, Wei Tao, Yi Yang, and Tian Jun Yu. "An Efficient Response Surface Method Using Givens Transformation for Structural Reliability Analysis." Advanced Materials Research 532-533 (June 2012): 408–11. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.408.
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The response surface method was proposed as a collection of statistical and mathematical techniques that are useful for modeling and analyzing a system which is influenced by several input variables. This method gives an explicit approximation of the implicit limit state function of the structure through a number of deterministic structural analyses. However, the position of the experimental points is very important to improve the accuracy of the evaluation of failure probability. In the paper, the experimental points are obtained by using Givens transformation in such way these experimental points nearly close to limit state function. A Numerical example is presented to demonstrate the improved accuracy and computational efficiency of the proposed method compared to the classical response surface method. As seen from the result of the example, the proposed method leads to a better approximation of the limit state function over a large region of the design space, and the number of experimental points using the proposed method is less than that of classical response surface method.
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Deng, Peng, Shiling Pei, John W. van de Lindt, Hongyan Liu, and Chao Zhang. "An approach to quantify the influence of ground motion uncertainty on elastoplastic system acceleration in incremental dynamic analysis." Advances in Structural Engineering 20, no. 11 (March 21, 2017): 1744–56. http://dx.doi.org/10.1177/1369433217693630.
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Inclusion of ground motion–induced uncertainty in structural response evaluation is an essential component for performance-based earthquake engineering. In current practice, ground motion uncertainty is often represented in performance-based earthquake engineering analysis empirically through the use of one or more ground motion suites. How to quantitatively characterize ground motion–induced structural response uncertainty propagation at different seismic hazard levels has not been thoroughly studied to date. In this study, a procedure to quantify the influence of ground motion uncertainty on elastoplastic single-degree-of-freedom acceleration responses in an incremental dynamic analysis is proposed. By modeling the shape of the incremental dynamic analysis curves, the formula to calculate uncertainty in maximum acceleration responses of linear systems and elastoplastic single-degree-of-freedom systems is constructed. This closed-form calculation provided a quantitative way to establish statistical equivalency for different ground motion suites with regard to acceleration response in these simple systems. This equivalence was validated through a numerical experiment, in which an equivalent ground motion suite for an existing ground motion suite was constructed and shown to yield statistically similar acceleration responses to that of the existing ground motion suite at all intensity levels.
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Rahman, Abdur, Qaiser Uz Zaman Khan, and Muhammad Irshad Qureshi. "Evaluation of Simplified Analysis Procedures for a High-Rise Reinforced Concrete Core Wall Structure." Advances in Civil Engineering 2019 (February 12, 2019): 1–21. http://dx.doi.org/10.1155/2019/1035015.
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Nonlinear response history analysis (NLRHA) procedure is one of the most precise and accurate numerical method to compute the seismic demands of high-rise structures but is complex, rigorous, and time-consuming and requires a lot of expertise for nonlinear modelling and results interpretation. Therefore, practicing engineers in developing countries like Pakistan still use the simplified analysis procedures to compute the seismic demands. Among the simplified analysis procedures, equivalent lateral force and response spectrum analysis procedures are widely used for the design purpose. However, other procedures have also been proposed in the recent past to accurately capture the higher mode effects in mid-to-high-rise structures. In the current study, results of a forty-story core wall building are used to check the relative accuracy and ease of application of different simplified analysis procedures. Furthermore, a modal decomposition technique is used to separate the modal responses from the NLRHA results, and a mode wise comparison of different demand parameters for different simplified procedures is performed. The current study has been used to clearly identify the reasons of inaccuracies in different simplified procedures. Furthermore, a simplified analysis procedure is proposed to accurately estimate the seismic demands of high-rise buildings and the possible solutions to improve their predictions.
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Oliveira, Fernando, Miguel Ayala Botto, Paulo Morais, and Afzal Suleman. "Semi-active structural vibration control of base-isolated buildings using magnetorheological dampers." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 3 (August 21, 2017): 565–76. http://dx.doi.org/10.1177/1461348417725959.
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In recent years, several solutions for structural vibration control of buildings have been proposed. In particular, the combination of base-isolated structures with complementary variable damping devices has been successful in reducing the base isolator displacements without increasing the building superstructure response when subjected to earthquake loads. In this paper, a magnetorheological device is installed on a 2-DOF mechanical model mounted on an experimental uniaxial shaking table. A simple numerical simulation model is derived for the experimental setup and it represents a typical base-isolated structure with a semi-active vibration controller. The control law combines a force tracking integral action with a clipped on–off adaptation rule that changes the magnetorheological damping in real time. The effectiveness of the proposed solution is demonstrated for both earthquake-like and real earthquake input ground motions. A comparison between the numerical and the experimental results validates the numerical simulations and it gives confidence in using this model for validation and evaluation of other semi-active control solutions based on magnetorheological dampers.
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Chen, Dong Di, Luo Wu, and Jia Wei Xiang. "The Comparison Investigation of OMA Methods on Time Domain." Advanced Materials Research 422 (December 2011): 443–47. http://dx.doi.org/10.4028/www.scientific.net/amr.422.443.
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Operational modal analysis (OMA) is an effective method to identify structural modal parameters from response signal under operational condition. Aiming at the evaluation of different time domain OMA methods in structural modal parameters identification, both numerical simulation and experimental investigation of cantilever beam have been applied to different methods, such as Sparse Time Domain (STD) method, Least Square Complex Exponential (LSCE) method and Eigensystem Realization Algorithm (ERA), etc. The comparison results indicated that ERA is the best one, LSCE method follows and STD method is worst.
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Rozmarynowski, Bogdan, and Tomasz Mikulski. "Selected Problems of Sensitivity and Reliability of a Jack-Up Platform." Polish Maritime Research 25, no. 1 (March 1, 2018): 77–84. http://dx.doi.org/10.2478/pomr-2018-0009.
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Abstract The paper deals with sensitivity and reliability applications to numerical studies of an off-shore platform model. Structural parameters and sea conditions are referred to the Baltic jack-up drilling platform. The sudy aims at the influence of particular basic variables on static and dynamic response as well as the probability of failure due to water waves and wind loads. The paper presents the sensitivity approach to a generalized eigenvalue problem and evaluation of the performace functions. The first order time-invariant problems of structural reliability analysis are under concern.
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Baziar, Mohammad Hassan, and Roohollah Dehghani. "Evaluation of seismic mechanical response of tunnel linings using shaking table tests and numerical analyses." Soil Dynamics and Earthquake Engineering 147 (August 2021): 106793. http://dx.doi.org/10.1016/j.soildyn.2021.106793.
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Domaneschi, Marco, Luca Martinelli, and Chun Xia Shi. "Aeolic and Seismic Structural Vibrations Mitigation on Long-Span Cable-Supported Bridges." Advanced Materials Research 690-693 (May 2013): 1168–71. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1168.
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Herein, two models of long-span bridges, namely a suspension and a cable-stayed one, are developed at the numerical level in a commercial finite elements code, starting from original data, and they are used to simulate the structural response under wind excitation and seismic excitation. The main goal of this study consists in the evaluation of a control strategy, designed and proven effective for the wind action, considering the suspension bridge, or for the seismic action, for the cable-stayed one, when the bridge structure is subjected to the seismic and the wind action respectively.
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Gao, Li Hong, Ge Ning Xu, and Ping Yang. "Important Sampling for Structural Reliability Based on Radial Basis Function Neural Network." Advanced Materials Research 291-294 (July 2011): 2189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2189.
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The methods of the structural reliability mainly involve analytical approximate reliability index or numerical simulation, which using the finite element solver is time-consuming and large computation. Important sampling (IS) for structural reliability analysis based on radial basis functions neural network (RBFNN) is proposed in the paper, in which trained RBFNN can model the implicit function between the structure response and input random variables. And limit state function of structure is simulated with RBFNN model applied to calculate the design point. The results show that the RBFNN can simulate the limit state functions of structures. Besides, calculation procedure based on finite element solver for structural analysis is greatly reduced and the efficiency in structural reliability evaluation is improved.
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Lima, Carmine, and Enzo Martinelli. "Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings." Buildings 9, no. 1 (December 28, 2018): 7. http://dx.doi.org/10.3390/buildings9010007.
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This paper aims at highlighting the main mechanical parameters controlling the behavior of the so-called ‘acceleration-sensitive’ non-structural components (NSCs). The first reports a short review of the current state of knowledge and the critical issues dealing with the prediction of the seismic response of NSCs. Then, the paper presents the results of a numerical parametric analysis intended to capture the key features of the coupled dynamic response of a two-degree-of-freedom (2DOF) system supposed to be representative of both main structure and ‘non-structural’ component (NSC). The main parameters controlling the dynamic response of NSCs emerge from this study, which could pave the way towards formulating more mechanically consistent relationships for evaluating the peak accelerations induced by seismic shakings on NSCs in buildings.