Bibliographies thématiques / Buffeting response

Littérature scientifique sur le sujet « Buffeting response »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Buffeting response"

1

Zuo, Leibin, Qinfeng Li, Cunming Ma, Li Yadong et Chuanchuan Hu. « Analysis of Span-Directional Coherence Function and Buffeting Response of a Long-Span Natural Gas Pipeline Suspension Bridge under a Turbulent Wind Field ». Journal of Sensors 2022 (19 septembre 2022) : 1–17. http://dx.doi.org/10.1155/2022/5381511.

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A long-span natural gas pipeline suspension bridge is prone to buffeting under the action of a turbulent wind field. In order to accurately calculate the buffeting response of the structure under a turbulent wind field, the 1 : 15 segment model wind tunnel test is used to obtain the aerodynamic coefficient and flutter derivative of the bridge deck structure. According to the test results, the buffeting force coherence functions under five different span-directional spacing are fitted. The results show that the buffeting force coherence function corresponding to different wind attack angles has a peak at the corresponding wing grid vibration frequency in the low-frequency region; when the spacing increases to r = 0.51 m or above, the amplitude of coherence function decreases significantly; for the spacing of r = 0.17 m , the buffeting force coherence functions in different directions are obviously different but the corresponding coherence functions of resistance, lift, and torque show a similar curve trend between different wind attack angles. Based on the Scanlan buffeting force correction model, the buffeting response under the reference wind speed of 30.1 m/s is analyzed in the frequency domain and compared with the wind tunnel test results of the whole bridge. The results show that the buffeting response calculated in this paper is in good agreement with the wind tunnel test results of the whole bridge and the buffeting response law is consistent. The maximum value of vertical buffeting response is located near the 1/4 span, and the maximum values of lateral and torsional response are located in the middle of the span. The lateral buffeting displacement response is significantly greater than the vertical buffeting displacement response. Under different wind attack angles, the vertical, lateral, and torsional buffeting displacement responses of the bridge deck structure increase nonlinearly with the increase of wind speed.
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Zhao, Guo Hui, Yu Li et Hua Bai. « Wind Tunnel Test and the Analysis of Buffeting Performance of Free-Standing Tower of Cable-Stayed Bridge under Yaw Wind ». Advanced Materials Research 532-533 (juin 2012) : 215–19. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.215.

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The buffeting performance of free-standing tower of JiangHai Navigation Channel Bridge, a cable-stayed bridge, under yaw wind is investigated by means of wind tunnel test of aeroelastic model. It is found that the variation of buffeting response of free-standing tower with wind yaw angle is not monotonous. The lateral buffeting response on the top of the free-standing tower reach their minimal values and maximal values at around 150°and 180°of wind yaw angle respectively and the longitudinal buffeting response attain their maximal values at around 90°of wind yaw angle. Also, at the 2/3 height of the tower the lateral buffeting response and torsional buffeting response get their minimal values at around 150°of wind yaw angle, and at around 180°achieve the maximal values. It is also seen that, the buffeting response changes with the wind speed at a conic curve approximately.
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Liu, Zhe, et Yong Kun Luo. « Bridge Buffeting Analysis Based on POD and Aeroelastic Coupling Method ». Advanced Materials Research 163-167 (décembre 2010) : 3878–81. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3878.

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The bridge buffeting response is a type of response varying with the time, space and frequency, in this paper, the bridge buffeting response analysis method based on Proper Orthogonal Decomposition (POD) and aeroelastic coupling is proposed, which can consider the contribution of effective turbulence on the bridge buffeting response. To test the proposed technique, a cable-stayed bridge is used to compare current analysis with the results using the traditional buffeting simulation method.
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Geng, Meng Xi, Ben Ning Qu, Jiao Long Peng et Xiao Chun Wang. « Buffeting Internal Force Response Analysis for Stable Type Suspension Bridge ». Applied Mechanics and Materials 444-445 (octobre 2013) : 32–36. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.32.

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According to the definition of the Buffeting, it is caused by a fluctuating wind. Since fluctuating wind is wind speed changing with time in the atmosphere, it will cause the vibration of the structure. And pulsating wind reflects the atmospheric boundary layer wind disturbance and randomness. In the paper, Stable Type Suspension Bridge (STSB) is researched for buffeting problem. A finite element model of the bridge is set up using the finite element software. The buffeting response of the bridge is calculated and studied. The influence of the opposite tensional structures in the bridge on buffeting response of the bridge is assessed.
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Zhu, Siyu, Yongle Li, Yuyun Yang et Nengpan Ju. « Stochastic Buffeting Analysis of Uncertain Long-Span Bridge Deck with an Optimized Method ». Buildings 12, no 5 (9 mai 2022) : 632. http://dx.doi.org/10.3390/buildings12050632.

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The buffeting analysis of an uncertain long-span bridge deck was carried out in this paper. Due to the effect of strong spatial correlation of wind excitation, it should be assumed as partially coherent multiple excitations. The following includes a theoretical formula for the buffeting analysis of a long-span bridge deck with uncertain parameters, which was achieved mainly by a combination of the stochastic pseudo excitation method (SPEM) and response surface method (RSM). The SPEM-RSM was firstly applied to deal with the complicated spectral density function matrix of wind excitation. The buffeting response of the bridge deck was then calculated and verified by the results from the Monte Carlo simulation (MCS). The efficiency and applicability of the hybrid method for strong spatial correlation was proved. After the comparison, the effect of uncertain structural parameters and wind speed on the buffeting performance of the bridge deck were computed. The results showed that the whole uncertainties essentially affected the buffeting response of the deck. The uncertain wind speed played the most significant role in the vertical and lateral motion of the deck. The joint influences between structural uncertainties and uncertain wind speed further affect the random characteristics of the responses. Finally, the effects of different wind speed and wind angle of attack on the aerodynamic performance of the bridge are examined. The variance of the responses increased with the development of wind speed. The effect of different attack angles on the buffeting responses was significant.
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Han, Y., Z. Q. Chen, X. G. Hua, Z. Q. Feng et GJ Xu. « Wind loads and effects on rigid frame bridges with twin-legged high piers at erection stages ». Advances in Structural Engineering 20, no 10 (9 janvier 2017) : 1586–98. http://dx.doi.org/10.1177/1369433216684350.

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This article presents a procedure for analyzing wind effects on the rigid frame bridges with twin-legged high piers during erection stages, taking into account all wind loading components both on the beam and on the piers. These wind loading components include the mean wind load and the load induced by the three turbulence wind components and by the wake excitation. The buffeting forces induced by turbulence wind are formulated considering the modification due to aerodynamic admittance functions. The buffeting responses are analyzed based on the coherence of buffeting forces and using finite element method in conjunction with random vibration theory in the frequency domain. The peak dynamic response is obtained by combining the various response components through gust response factor approach. The procedure is applied to Xiaoguan Bridge under different erection stages using the analytic aerodynamic parameters fitted from computational fluid dynamics. The numerical results indicate that the obtained peak structural responses are more conservative and accurate when considering the effect of each loading component on the beam and on the piers, and the roles of different loading components are different with regard to bridge configurations. Aerodynamic admittance functions are source of the important part of the error margin of the analytical prediction method for buffeting responses of bridges, and buffeting responses based on wind velocity coherence will underestimate the results.
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Kim, Jung, Kong, Lee et An. « In-Situ Data-Driven Buffeting Response Analysis of a Cable-Stayed Bridge ». Sensors 19, no 14 (10 juillet 2019) : 3048. http://dx.doi.org/10.3390/s19143048.

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To analytically evaluate buffeting responses, the analysis of wind characteristics such as turbulence intensity, turbulence length, gust, and roughness coefficient must be a priority. The analytical buffeting response is affected by the static aerodynamic force coefficient, flutter coefficient, structural damping ratio, aerodynamic damping ratio, and natural frequencies of the bridge. The cable-stayed bridge of interest in this study has been used for 32 years. In that time, the terrain conditions around the bridge have markedly changed from the conditions when the bridge was built. Further, the wind environments have varied considerably due to climate change. For these reasons, the turbulence intensity, length, spectrum coefficient, and roughness coefficient of the bridge site must be evaluated from full-scale measurements using a structural health monitoring system. Although the bridge is located on a coastal area, the evaluation results indicated that the wind characteristics of bridge site were analogous to those of open terrain. The buffeting response of the bridge was analyzed using the damping ratios, static aerodynamic force coefficients, and natural frequencies obtained from measured data. The analysis was performed for four cases. Two case analyses were performed by applying the variables obtained from measured data, while two other case analyses were performed based on the Korean Society of Civil Engineers (KSCE) Design Guidelines for Steel Cable Supported Bridges. The calculated responses of each analysis case were compared with the buffeting response measured at wind speeds of less than 25 m/s. The responses obtained by numerical analysis using estimated variables based on full-scale measurements agreed well with the measured buffeting responses measured at wind speeds of less than 25 m/s. Moreover, an extreme wind speed of 44 m/s, corresponding to a recurrence interval of 200 years, was derived from the Gumbel distribution. Therefore, the buffeting responses at wind speeds of 45 m/s were also determined by applying the estimated variables. From these results, management criteria based on measurement data for in-service bridge are determined and each level of management is proposed.
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Li, Yan, Jun Ma, Hong Fei Sheng, Li Hui Yin, Li Wang et Zheng Jun Wang. « Buffeting Reliability Analysis of Long Span Concrete-Filled Steel Tube Arch Bridge during Construction Stage ». Key Engineering Materials 540 (janvier 2013) : 55–62. http://dx.doi.org/10.4028/www.scientific.net/kem.540.55.

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In construction stage, a large buffeting response would endanger construction safety and quality for a long span concrete-filled steel tube (CFST) arch bridge. Developing the study on buffeting security is indispensable to CFST arch bridge in construction stage. Combining random vibration analysis of structure with modern probability theory, taking an actual large span CFST arch bridge as example, dynamic reliability of buffeting responses research and analysis is developed, which is based on the buffeting analysis on time domain at the longest cantilever construction stage. The paper gives quantitative valuation on wind-vibration safety performance of the bridge in construction phase and offers a new thought and reference for homologous project.
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Huang, Li Hua, Bing Li, Gang Lei et Dong Dong Shi. « Dynamic and Buffeting Analysis of Suspension Pipeline Bridge ». Applied Mechanics and Materials 137 (octobre 2011) : 113–18. http://dx.doi.org/10.4028/www.scientific.net/amm.137.113.

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Suspension aerial crossing structures are broadly applied for supporting petroleum pipelines across special terrain for their optimal structural style and constructional benefit. Due to the general flexibility of the structures, pipeline suspension bridges easily vibrate under the action of random wind forces. One of the typical vibration responses, known as buffeting, is considered to be an important factor for the serviceable safety of suspension bridges. In this paper, the dynamical model of a suspension pipeline bridge is presented and buffeting analysis under the action of wind loads is carried out through the Finite Element Method. It is shown that the frequency spectrum of the suspension pipeline bridge is composed of densely distributed modal frequencies. Low frequencies are mainly focused on horizontal and vertical bending motions of the bridge. Based on the standard harmonic response analysis, the Pseudo-Excitation Method (PEM) is introduced to obtain the buffeting vibration in response to the wind excitation. The correlative formulas of quasi-static buffeting force model are derived, and the buffeting analysis of the bridge using PEM is achieved on the solution platform Ansys.
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Bai, Hua, et Yue Zhang. « Research on Simplifying the Buffeting Response Spectrum of Suspension Bridge ». Advanced Materials Research 791-793 (septembre 2013) : 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.370.

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In order to solve the problem of traditional buffeting analysis method is complex, the paper summarizes a calculation method of simplifying the suspension bridge buffeting response spectrum which considers the background response by simplifying the vibration mode function. Examples calculation shows that this function is efficient and accurate. With this method the paper analyzes the impact of parameters including structural damping ratio, aerodynamic admittance function, pneumatic self-excited forces, the main beam span and so on on the suspension bridge buffeting response. Results show that: First, the impact of the background response on concrete bridges with larger damping ratio cannot be ignored. Second, when aerodynamic admittance takes Sears function, the buffeting response analysis results may be partial dangerous. Third, the role of the background response on large long-span bridges of more than 2000 m can be ignored.
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Thèses sur le sujet "Buffeting response"

1

Le, Thai Hoa. « UNSTEADY BUFFETING FORCES AND GUST RESPONSE OF BRIDGES WITH PROPER ORTHOGONAL DECOMPOSITION APPLICATIONS ». 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/49126.

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学位授与大学：京都大学 ; 取得学位: 博士(工学) ; 学位授与年月日: 2007-09-25 ; 学位の種類: 新制・課程博士 ; 学位記番号: 工博第2843号 ; 請求記号: 新制/工/1418 ; 整理番号: 25528
The unsteady buffeting forces and the gust response prediction of bridges in the atmospheric turbulent flows is recently attracted more attention due to uncertainties in both experiment and analytical theory. The correction functions such as the aerodynamic admittance function and the spatial coherence function have been supplemented to cope with limitations of the quasi-steady theory and strip one so far. Concretely, so-called single-variate quasi-steady aerodynamic admittance functions as the transfer functions between the wind turbulence and induced buffeting forces, as well as coherence of wind turbulence has been widely applied for the gust response prediction. Recent literatures, however, pointed out that the coherence of force exhibits higher than that of turbulence. These correction functions, in the other words, contain their uncertainties which are required to be more understanding. Proper orthogonal decomposition (POD), known as the Karhunen-Loeve decomposition has been applied popularly in many engineering fields. Main advantage of the POD is that the multi-variate correlated random fields/processes can be decomposed and described in such simplified way as a combination of limited number of orthogonally low-order dominant eigenvectors (or turbulent modes) which is convenient and applicable for order-reduced representation, simulation of the random fields/processes such as the turbulent fields, turbulent-induced force fields and stochastic response prediction as well. The POD and its proper transformations based on either zero-time-lag covariance matrix or cross spectral one of random fields/processes have been branched by either the covariance proper transformation (CPT) in the time domain or the spectral proper transformation (SPT) in the frequency domain. So far, the covariance matrix-based POD and its covariance proper transformation in the time domain has been used almost in the wind engineering topics due to its simplification in computation and interpretation. In this research, the unsteady buffeting forces and the gust response prediction of bridges with emphasis on the POD applications have been discussed. Investigations on the admittance function of turbulent-induced buffeting forces and the coherence one of the surface pressure as well as the spatial distribution and correlation of the unsteady pressure fields around some typically rectangular cylinders in the different unsteady flows have been carried out thanks to physical measurements in the wind tunnel. This research indicated effect of the bluff body flow and the wind-structure interaction on the higher coherence of buffeting forces than the coherence of turbulence, thus this effect should be accounted and undated for recent empirical formulae of the coherence function of the unsteady buffeting forces. Especially, the multi-variate nonlinear aerodynamic admittance function has been proposed in this research, as well as the temporo-spectral structure of the coherence functions of the wind turbulence and the buffeting forces has been firstly here using the wavelet transform-based coherence in order to detect intermittent characteristics and temporal correspondence of these coherence functions. In POD applications, three potential topics in the wind engineering field have been discussed in the research: (i) analysis and identification, modeling of unsteady pressure fields around model sections; (ii) representation and simulation of multi-variate correlated turbulent fields and (iii) stochastic response prediction of structures and bridges. Especially, both POD branches and their proper transformations in the time domain and the frequency one have been used in these applications. It found from these studies that only few low-order orthogonal dominant modes are enough accuracy for representing, modeling, simulating the correlated random fields (turbulence and unsteady surface pressure, unsteady buffeting forces), as well as predicting stochastic response of bridges in the time and frequency domains. The gust response prediction of bridges has been formulated in the time domain at the first time in this research using the covariance matrix-based POD and its covariance proper transformation which is very promising to solve the problems of the nonlinear and unsteady aerodynamics. Furthermore, the physical linkage between these low-order modes and physical causes occurring on physical models has been interpreted in some investigated cases.
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第13372号
工博第2843号
新制||工||1418(附属図書館)
25528
UT51-2007-Q773
京都大学大学院工学研究科社会基盤工学専攻
(主査)教授 松本 勝, 教授 河井 宏允, 准教授 白土 博通
学位規則第4条第1項該当
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Barni, N. « Nonlinear buffeting response of suspension bridges considering time-variant self-excited forces ». Doctoral thesis, 2022. http://hdl.handle.net/2158/1278784.

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In the last thirty years, the aerodynamic nonlinearities related to the slow variation of the angle of attack produced by large-scale atmospheric turbulence and their impact on the buffeting response of long-span suspension bridges have been a hot topic in wind engineering research. Self-excited forces accounting for such an effect of turbulence have been crucial in predicting the dynamic response of bridge sectional models and long-span suspension bridges subjected to multi-harmonic gusts and the turbulent wind, respectively. Despite several nonlinear aerodynamic models produced by the scientific community throughout the last years, only few studies on full suspension bridges nonlinear buffeting response in realistic turbulent flows are available. This doctoral work addresses this topic, aiming to enlarge the understanding of the effects of turbulence on the suspension bridge buffeting response. The first contribution of this work concerns nonlinear aerodynamic load modelling. Indeed, large-scale atmospheric turbulence produces large-amplitude low-frequency fluctuations of the angle of attack that can significantly change the self-excited and the external buffeting forces acting on a bridge deck. Assuming that the angle of attack varies slowly compared to the bridge motion, a time-variant linear model relying on Roger’s rational function approximation (RFA) of the force transfer function is proposed for modelling self-excited forces. In particular, an existing model is improved by a flexible fitting of the RFA directly in the multivariate space of reduced velocity and angle of attack. Another contribution of the present work is setting up an experimental procedure based on bi- or multi-harmonic forced-vibration tests to underscore the variation of magnitude and phase of self-excited forces under a time-variant angle of attack. These wind tunnel tests also allowed a sound experimental validation of the proposed model, considering two quite different bridge deck cross-sections as case studies. Aerodynamic derivatives for various angles of attack were measured to determine the model parameters. Despite its simplicity, the model yields accurate results up to relatively fast variations of the angle of attack, and it can reproduce the complicated behaviour of the self-excited forces revealed by the experiments. The model performance strongly depends on the goodness of the RFA-based fitting of aerodynamic derivatives, and the excellent results obtained were possible thanks to the high flexibility of the proposed method. Then, the nonlinear external buffeting forces are formulated to achieve a reasonable compromise between the conflicting needs of modelling both nonlinear and unsteady effects of wind velocity fluctuations. Then, the proposed 2D RFA model for self-excited forces and the nonlinear buffeting forces are incorporated into a stochastic time-variant state-space framework to assess the nonlinear buffeting response of a suspension bridge. The most important feature of this model is the modulation of the self-excited forces due to the spatio-temporal fluctuation of the angle of attack produced by low-frequency turbulence. Such an angle of attack accounts for the spatial wind correlation along the bridge girder. The model is applied to the Hardanger Bridge in Norway, considering different wind conditions. Indeed, the aerodynamic derivatives of this bridge deck cross-section present a strong dependence on the mean angle of attack. Moreover, a novel approach is suggested, diversifying the cut-off frequencies for the considered input motion components in the self-excited forces. In the wake of this, the thesis also investigates the sensitivity of the response statistics to the model cut-offs used to separate the low-frequency and the high-frequency turbulence band. The results emphasise the significant impact on the buffeting response and flutter stability of considering time-variant self-excited forces, though in specific cases the classical linear time-invariant approach is found to provide accurate predictions of the bridge vibrations.
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Lee, Chung-Hau, et 李宗豪. « A Proposed TMD Model for Suppressing Coupled-Mode Buffeting Response of Long-Span Bridges ». Thesis, 1998. http://ndltd.ncl.edu.tw/handle/26000639961613570347.

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碩士
淡江大學
土木工程學系
86
The developments of bridge construction techniques and the improvements of high strengh materials have made the modern bridges designed and built towards longer spans with more slender sections. Because these types of bridges are more flexible than the other types of bridges, they are more susceptible to wind excitation. To strengthen the weakness of these types of bridges, some devices must be used to control the wind effects. Among these devices, tuned mass dampers have been installed in some existed bridges, and their performance is proven to be effective against wind-induced vibrations. 　　In the wind-induced buffeting problems of the long-span bridges, the vertical and torsional displacements are always the major concerns for the bridge engineers. However, the traditional tuned mass dampers are designed to reduce dynamic response in one direction only. To achieve the goal of suppressing both the vertical and torsional response, the 2 D. O. F. model, with two frequencies that are tuned at the effective frequencies of the first vertical and torsional modes of the bridge, is proposed. The aerodynamic coupling is taken into account for the formulation of the bridge-TMD system. Therefore, this model is specially applicable for those bridges in which mode coupling is significant. A parametric study is performed to investigate the buffeting response reduction and the increase of the flutter velocity. Based on this parametric analysis, the procedures of the TMD design for the wind-exeited bridges are then proposed. The influence of the aerodynamic coupling on the TMD design is also addressed. The results show that the propposed TMD is at least as effective as the usual TMD on suppressing buffeting respponse, and it appreciably raises the stability of the bridge either with the type of stalled or coupled flutter.
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Chang, Chun-Hsu, et 張君旭. « Study on Identification of Parameters for Cable-Stayed Bridge Deck Buffeting Response Analyses and on Related Numerical Simulations ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/00616831865851633967.

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博士
國立臺灣科技大學
營建工程系
96
As the main spans of bridges become longer, engineers have to assess the wind induced vibration of bridge decks for safety and serviceability. Generally, either the full bridge model wind tunnel test or section model wind tunnel test with analytical procedure is used to evaluate buffeting responses of bridges. Modal parameters, including modal frequencies and damping ratios, are usually obtained by finite element models; aerodynamic parameters, including aerodynamic coefficients and flutter derivatives, are obtained by section model wind tunnel test. In this research, modal and aerodynamic parameters are obtained by identifying filed measurement results and numerical simulations respectively. This study proposes a method, combing empirical modal decomposition, random decrement technique with Hilbert transform, for identification of modal parameters in time domain from modally coupled response time histories. Aerodynamic and aeroelastic phenomena of blunt sections are simulated by numerical simulations; the associated aerodynamic coefficients are evaluated; flutter derivatives are identified by stochastic subspace identification method. Vortex shedding and reattachment phenomena are observed in the simulated results. The obtained aerodynamic parameters are compared with those of the wind tunnel test in the literature, and indicated that aerodynamic coefficients approach to the average of wind tunnel test results, flutter derivatives are higher estimated slightly. Finally, numerical simulations are conducted for a bridge section; the interaction effect of fluid-bridge section is accounted by an arbitrary Lagrangian-Eulerian strategy. Finally, the root mean square values of bridge buffeting responses are evaluated by an approximate analytic formula using the obtained parameters. These results can be used to assess safety and serviceability of the bridge. The effects of modal parameters, aerodynamic coefficient and flutter derivatives on buffeting responses are also investigated.
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SALVATORI, LUCA. « Assessment and Mitigation of Wind Risk of Suspended-Span Bridges ». Doctoral thesis, 2007. http://hdl.handle.net/2158/790767.

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Within the general framework of risk management, the vulnerability of flexible bridges under wind action is addressed. Particular attention is paid to the risk of aeroelastic instabilities and buffeting oscillations in presence of self-excited phenomena. A computational framework based on semi-empirical cross-sectional models for the wind loading and on the three-dimensional finite-element discretization of the structure is developed. This represents a basic tool for assessing wind risk and it is used to obtain some results in the understanding of bridge behaviour under wind storms and in the comparison of different design solutions. A time-domain model for unsteady wind loading is derived as a development of indicial function load models. Some inaccuracy issues of literature models are solved and the consistency with the quasi-steady limit is ensured. A numerical procedure for identifying the load model coefficients from wind tunnel experimental data in such a way that the reliability of the measured quantities is accounted for is proposed, implemented, and validated. Analyses including structural nonlinearities and damping devices are made possible by the developed time-domain methods. The effects on aeroelastic stability and buffeting response of along-span wind coherence, mean deformations, and load and structural nonlinearities are quantified. Finally, mitigation strategies against aeroelastic instability and excessive buffeting oscillations are discussed. A risk-based comparison of some possible solutions is performed in the special case of a suspension bridge. Crossed hangers, secondary cables with opposed curvature, and tuned mass control devices are considered. The results, rendered in terms of yearly probability of collapse and expected number of days of closure to traffic, easily allow a cost-benefit analysis for deciding among different designs. Interesting results are obtained from the simulation of bridges controlled by tuned mass devices.
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Chiu, Chao-Rong, et 邱昭融. « Effects of Lateral Flutter Derivatives on Flutter Wind Speeds and Buffeting Responses of Cable-Supported Bridges ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/04692499727344008961.

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碩士
淡江大學
土木工程學系碩士班
101
In general, the most important effects of bridge aerodynamics are flutter and buffeting. In the past, owing to the experimental technique, we always ignore the effects of lateral flutter derivatives, and only consider vertical and torsional flutter derivatives in the flutter and buffeting analysis. However, ignoring the lateral flutter derivatives may not reflect the real aerodynamic behavior of long-span bridges. Such bridges are usually made of lightweight materials and supported by cable systems. The lateral motions on this type of bridges are significant and usually coupled with torsional motions. Three types of bridges, including cable-stayed bridges, suspension bridges and tied arch bridges, are used in the examples. The lateral flutter derivatives, adopted from references, are used in the multi-mode flutter and buffeting analysis. The effects of mode combinations and the lateral flutter derivatives on the flutter wind velocities and buffeting responses of different types of bridges are investigated through a parametric analysis. The results show that the contributions of the lateral-torsional coupling modes and the lateral flutter derivatives on the aerodynamic behavior of bridges increase with bridge span lengths. These effects should be taken account into the aerodynamic analysis for the long-span bridges. The results also reveal that of the flutter derivatives used here can stabilize the aerodynamic effects and can destabilize the aerodynamic effects.
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Cheng, Shih-Ying, et 鄭詩穎. « Comparative Study of Aerodynamic Responses of Kao-Ping-Hsi Cable-Stayed Bridge between field measurements and buffeting analysis ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/83235141652051983110.

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碩士
淡江大學
土木工程學系碩士班
96
Since Kao-Ping-Hsi Cable-Stayed Bridge has the longest span length in Taiwan, it is more sensitive to wind The study to monitor this bridge and compare the field measurements with buffeting theoretical results becomes an important task. Therefore, this bridge was chosen as the target for monitoring. Two 3D anemometers were installed at the middle point of the longer span to measure wind characteristics. Two sets of velocity censors, respectively installed at the middle point and on third point of the longer span, were used to measure the dynamic responses of the bridge. The aerodynamic behavior of the Kao-Ping-Hsi Cable-Stayed Bridge was analyzed based on the measured data obtained from the field measurements. The data were collected as several typhoons were attacking Taiwan during 2006-2007. Among these typhoons, Typhoon Krosa was the strongest and its maximum 10 min. mean wind speed was as high as 16 m/s. The effects of this typhoon on the bridge are the main concern in this study. The modal frequencies and damping ratios of the bridge were identified by the methods of FDD and MRD, respectively. These identified parameters along with the fitted wind spectrum were substituted into a numerical model to evaluate the buffeting responses of the targeted bridge. The results obtained from the re-analysis, the field measurements, the section model test and the full model test were compared. The comparative study indicates that the differences between the results obtained from the re-analysis and the results measured from the field measurements are 10% in the vertical direction and 30% in the torsional direction. The drag response obtained from re-analysis is only 25% of that measured from the field measurements. The possible reason for this large discrepancy results from high noise in the field measurements. Since turbulent intensities and damping ratios used in the section model tests and the full model tests were different from those identified from the field measurements. The results obtained from the section model tests are still consistent with those from on-site measurements. However, the results obtained from the full model test are much larger than the other results. This is because the reduced wind velocity in the tests is low and the high noise affected the results..
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Livres sur le sujet "Buffeting response"

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M, Miller Jonathan, Doggett Robert V et Langley Research Center, dir. Attenuation of empennage buffet response through active control of damping using piezoelectric material. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1993.

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Center, Langley Research, dir. Dynamic response characteristics of two transport models : Tested in the National Transonic Facility. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1993.

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Coe, Charles F. Predictions of F-111 TACT aircraft buffet response and correlations of fluctuating pressures measured on aluminum and steel models and the aircraft. Washington : NASA, 1987.

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F, Sheta Essam, Liu C. H. 1941-, United States. National Astronautics and Space Administration. et AIAA Applied Aerodynamics Conference (14th : 1996 : New Orleans, LA), dir. Computation and validation of fluid/structure twin tail buffet response. [Washington, D.C : National Aeronautics and Space Administration, 1997.

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Center, Langley Research, dir. Vertical tail buffeting alleviation using piezoelectric actuators : Some results of the Actively Controlled Response of Buffet-Affected Tails (ACROBAT) Program. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1997.

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Coe, Charles F. Predictions of F-111 TACT aircraft buffet response and correlations of fluctuating pressures measured on aluminum and steel modes and the aircraft. [Washington, DC] : National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1988.

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Coe, Charles F. Predictions of F-111 TACT aircraft buffet response and correlations of fluctuating pressures measured on aluminum and steel modes and the aircraft. [Washington, DC] : National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1988.

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W, Moss Steven, Doggett Robert V et Langley Research Center, dir. Some buffet response characteristics of a twin-vertical-tail configuration. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1990.

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Dynamic response of a hammerhead launch vehicle wind-tunnel model. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1991.

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Chapitres de livres sur le sujet "Buffeting response"

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Jakobsen, J. B. « Motion-Dependent Forces on Streamlined Bridge Girders and Their Influencing Parameters – Observations from Wind Tunnel Buffeting Response Data ». Dans Lecture Notes in Civil Engineering, 387–401. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12815-9_31.

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Zhu, Ledong, Chuanliang Zhao, Shuibing Wen et Quanshun Ding. « Signature Turbulence Effect on Buffeting Responses of a Long-span Bridge with a Centrally-Slotted Box Deck ». Dans Computational Structural Engineering, 399–409. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2822-8_44.

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« Buffeting Response to Skew Winds ». Dans Wind Effects on Cable-Supported Bridges, 385–438. Singapore : John Wiley & Sons Singapore Pte. Ltd., 2013. http://dx.doi.org/10.1002/9781118188293.ch10.

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« Non-Stationary and Non-Linear Buffeting Response ». Dans Wind Effects on Cable-Supported Bridges, 661–728. Singapore : John Wiley & Sons Singapore Pte. Ltd., 2013. http://dx.doi.org/10.1002/9781118188293.ch15.

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Xu, Y. L., D. K. Sun et K. M. Shum. « Comparison of buffeting response of a suspension bridge between analysis and aeroelastic test ». Dans Advances in Steel Structures (ICASS '02), 865–72. Elsevier, 2002. http://dx.doi.org/10.1016/b978-008044017-0/50101-3.

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Wang, H., A. Li, T. Zhu et R. Hu. « Full-scale measurements on buffeting response of Sutong Bridge under typhoon Fung-Wong ». Dans Bridge Maintenance, Safety, Management and Life-Cycle Optimization, 194. CRC Press, 2010. http://dx.doi.org/10.1201/b10430-122.

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« Mitigation of buffeting response for a 800 m cable-stayed bridge during construction ». Dans Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & ; CD-ROM, 353–54. CRC Press, 2015. http://dx.doi.org/10.1201/b18175-120.

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Freeland, Cynthia A. « Horror and Natural Evil in The Plague ». Dans Camus's The Plague, 147–74. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197599327.003.0007.

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Abstract The Plague is a record of great suffering. Children thrash with painful buboes, families are separated, and victims cough up clots of blood. Horrors proliferate, from the initial rat invasions and deaths to burial pits emitting the putrid smoke of human cremations. Here nature is indifferent at best. Camus describes natural phenomena as portents of doom: especially the relentless winds buffeting the town. My chapter places Camus’s novel within the context of what I have elsewhere called “natural horror,” a genre with no identifiable monster but suffused with dread. I discuss how rats and bats function in horror works like Dracula and in The Plague, as well as in our current pandemic, as “zoonotic villains,” symbols of malevolence. Finally, I assess the response Camus recommends to what his narrator Dr. Rieux calls the “ridiculous and hideous injustice” of the world.
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Park, J., H. Kim, H. Lee, H. Koh et S. Cho. « Buffeting responses of a cable-stayed bridge during the typhoon Kompasu ». Dans Bridge Maintenance, Safety, Management, Resilience and Sustainability, 1158–61. CRC Press, 2012. http://dx.doi.org/10.1201/b12352-162.

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Offer, Avner, et Gabriel Söderberg. « Swedosclerosis or Pseudosclerosis ? Sweden in the 1980s ». Dans The Nobel Factor, 198–219. Princeton University Press, 2019. http://dx.doi.org/10.23943/princeton/9780691196312.003.0010.

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This chapter considers the state of Swedish economics in the 1980s. Between 1976 and 1982, Sweden suffered a sequence of economic buffetings. Government expenditure rose to more than 60 percent of GDP, and public employment embraced one-third of the workforce. In response, business flung itself into massive protest, setting up think tanks which published massively, agitating in parliament, the press, and even in the streets. The discipline of economics mobilized too. Assar Lindbeck cranked up criticism of his old party, and finally resigned from it in 1982 over the wage-fund issue, a few weeks before the election. But in defiance of his forebodings, the eight years of Social Democratic government after 1982 were economically more successful than the previous six under centre-right (‘bourgeois’) governments: inflation fell most of the time, output increased, and unemployment stayed low.
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Actes de conférences sur le sujet "Buffeting response"

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Xu, Heqin, Matthew Mallet et Tamas Liszkai. « Turbulent Buffeting of Helical Coil Steam Generator Tubes ». Dans ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28868.

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Turbulent buffeting is the most common flow-induced-vibrating mechanism in the nuclear power industry since turbulent flow is present in virtually all power plant components and will always apply a random pressure to the surface of the structures wherever there is a flow over, along, inside or cross a structure. For each specific component subjected to turbulent buffeting, the applicable potential degradation mechanisms, such as wear, fretting, or fatigue must be identified so that appropriate evaluations can be performed. For SG tubing, the two degradation mechanisms associated with turbulent buffeting response are tube-to-support wear and tube fatigue, both of which can be evaluated using the root mean square (RMS) response of turbulence induced vibration. In this paper, a methodology is proposed and implemented using ANSYS APDL command objects to estimate the RMS response for multiply supported SG tubes, such as the helical coil SG tubes in the NuScale design. As expected, the random vibrations due to the lower velocities associated with the natural circulation design result in lower RMS responses, which help prevent wear and fatigue failures in reactor module components, such as SG tubes. The number of modes required to adequately capture the RMS response is examined. The cross-modal contributions to RMS response are also examined to provide a justification to exclude the cross-modal terms in future evaluations. In order to capture the dynamic behavior accurately, the hydrodynamic mass and mass inside the helical tubes are fully accounted for in the total effective mass along the SG tubes.
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Lystad, Tor Martin, Aksel Fenerci et Ole Øiseth. « Long-term extreme buffeting response of long-span bridges considering uncertain turbulence parameters ». Dans IABSE Congress, Ghent 2021 : Structural Engineering for Future Societal Needs. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1606.

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<p>Long-term extreme response analyses are recognized as the most accurate way to predict the extreme responses of marine structures excited by stochastic environmental loading. In wind engineering for long-span bridges this approach has not become the standard method to estimate the extreme responses. Instead, the design value is often estimated as the expected extreme response from a short-term storm described by an N-year return period mean wind velocity.</p><p>In this study, the long-term extreme buffeting response of a long-span bridge is investigated, and the uncertainty of the turbulent wind field is described by a probabilistic model. The results indicate that the current design practice may introduce significant uncertainty to the buffeting load effects used in design, when the variability in the turbulence parameters as well as the uncertainty of the short-term extreme response is neglected.</p>
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Lystad, Tor Martin, Aksel Fenerci et Ole Øiseth. « Long-term extreme buffeting response of long-span bridges considering uncertain turbulence parameters ». Dans IABSE Congress, Ghent 2021 : Structural Engineering for Future Societal Needs. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1606.

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<p>Long-term extreme response analyses are recognized as the most accurate way to predict the extreme responses of marine structures excited by stochastic environmental loading. In wind engineering for long-span bridges this approach has not become the standard method to estimate the extreme responses. Instead, the design value is often estimated as the expected extreme response from a short-term storm described by an N-year return period mean wind velocity.</p><p>In this study, the long-term extreme buffeting response of a long-span bridge is investigated, and the uncertainty of the turbulent wind field is described by a probabilistic model. The results indicate that the current design practice may introduce significant uncertainty to the buffeting load effects used in design, when the variability in the turbulence parameters as well as the uncertainty of the short-term extreme response is neglected.</p>
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Karmakar, D., S. Ray Chaudhuri et M. Shinozuka. « Buffeting Response of Vincent Thomas Bridge under Conditionally Simulated Wind ». Dans Structures Congress 2010. Reston, VA : American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41130(369)60.

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Wang, Jungao, Etienne Cheynet, Jasna Bogunović Jakobsen et Jónas Snæbjörnsson. « Time-Domain Analysis of Wind-Induced Response of a Suspension Bridge in Comparison With the Full-Scale Measurements ». Dans ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61725.

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The present study compares the buffeting response of a suspension bridge computed in the time-domain with full-scale measurement data. The in-service Lysefjord Bridge is used as a study case, which allows a unique comparison of the computational results with full-scale buffeting bridge response observed during a one year monitoring period. The time-domain analysis is performed using a finite element approach. Turbulent wind field is simulated according to the governing bridge design standard in Norway for three different terrain categories. The time-domain analysis indicates that the non-linear components of the wind loading are of limited importance in the present case, contributing by less than 5% to the standard deviation of the lateral displacement. The contribution of the buffeting loads on the main cables, hangers and towers to the lateral dynamic response of the bridge girder is about 6%. With the time-domain method, mode coupling as well as the influence of cables and towers are well captured in the simulation results. The buffeting response, estimated in terms of the standard deviation of acceleration, is found to be in good agreement with the field measurement data. Comparison suggests that the proposed numerical method, with the non-linear force model, is able to predict the bridge response reasonably well.
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Ali, Khawaja, et Aleena Saleem. « Proposal of nonlinear buffeting analysis framework for long-span bridges using Volterra series-based non-stationary wind force model ». Dans IABSE Symposium, Prague 2022 : Challenges for Existing and Oncoming Structures. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0423.

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<p>This paper presents a nonlinear framework to simulate the buffeting response of long-span bridges under Typhoon winds by using a Volterra series-based wind force model. First, the non-stationary wind fields are generated around the bridge using evolutionary power spectrum of the measured wind speeds. Subsequently, the nonlinear buffeting load model is formulated in time-domain by employing the Volterra series. Then, these Volterra kernels are identified from flutter derivatives. At last, the wind forces are applied to 3D fishbone finite element model of a suspension bridge and nonlinear buffeting analysis is performed. The time history analysis results show a good agreement in the simulation of Typhoon-induced buffeting response when compared with the measurement data of bridge displacements. Also, the analysis results are compared with the simulation results obtained from the existing wind load models to show the efficacy of the proposed framework.</p>
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Nai-bin, Jiang, Gao Li-xia, Huang Xuan, Zang Feng-gang et Xiong Fu-rui. « Research on Two-Phase Flow Induced Vibration Characteristics of U-Tube Bundles ». Dans ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65207.

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In steam generators and other heat exchangers, there are a lot of tube bundles subjected to two-phase cross-flow. The fluctuating pressure on tube bundle caused by turbulence can induce structural vibration. The experimental data from a U-tube bundle of steam generator in air-water flow loop are analyzed in this work. The different upper bounds of buffeting force are used to calculate the turbulence buffeting response of U-tubes, and the calculation results are compared with the experimental results. The upper bounds of buffeting force include one upper bound based on single-phase flow, and two upper bounds based on two-phase flow. It is shown that the upper bound based on single-phase flow seriously underestimated the turbulence excitation, the calculated vibration response is much less than the experimental measurement. On the other hand, the vibration response results calculated with the upper bounds based on two-phase flow are closer to the measured results under most circumstances.
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Huang, Haixin, Ying Zhang, Bo Liu et Fuyou Xu. « Influence Factors Analysis of Buffeting Response of Self-Anchored Cable-Stayed Suspension Bridge ». Dans Ninth International Conference of Chinese Transportation Professionals (ICCTP). Reston, VA : American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41064(358)347.

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Diana, Giorgio, Luca Amerio, Vincent De Ville, Santiago Hernández, Guy Larose, Simone Omarini, Stoyan Stoyanoff et al. « Super-long span bridge aerodynamics benchmark : additional results for TG3.1 Step 1.2 ». Dans IABSE Congress, Ghent 2021 : Structural Engineering for Future Societal Needs. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1982.

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<p>This paper presents the ongoing benchmark results of IABSE Task Group 3.1. The task of this working group is to create benchmark results for the validation of methodologies and software programs developed to assess the stability and the buffeting response of long span bridges. Indeed, accurate estimations of structural stability and response to strong winds are critical for the successful design of long-span bridges. While the first results of the benchmark, dealing with a section approach, have been already published, in this paper the ongoing activity and results of the task group are presented. The topic of these results is the numerical response of a full-bridge model under the actions of a multi-correlated wind field both in terms of aeroelastic stability and buffeting response.</p>
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Diana, Giorgio, Luca Amerio, Vincent De Ville, Santiago Hernández, Guy Larose, Simone Omarini, Stoyan Stoyanoff et al. « Super-long span bridge aerodynamics benchmark : additional results for TG3.1 Step 1.2 ». Dans IABSE Congress, Ghent 2021 : Structural Engineering for Future Societal Needs. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1982.

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<p>This paper presents the ongoing benchmark results of IABSE Task Group 3.1. The task of this working group is to create benchmark results for the validation of methodologies and software programs developed to assess the stability and the buffeting response of long span bridges. Indeed, accurate estimations of structural stability and response to strong winds are critical for the successful design of long-span bridges. While the first results of the benchmark, dealing with a section approach, have been already published, in this paper the ongoing activity and results of the task group are presented. The topic of these results is the numerical response of a full-bridge model under the actions of a multi-correlated wind field both in terms of aeroelastic stability and buffeting response.</p>
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