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1
Denney, Dennis. "Broadband Seismic: Ultimate Input for Quantitative Seismic Interpretation." Journal of Petroleum Technology 65, no. 03 (March 1, 2013): 154–56. http://dx.doi.org/10.2118/0313-0154-jpt.
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Uzdin, A. M., G. V. Sorokina, and Kh Kh Kurbanov. "A simple seismic input model for estimating the seismic resistance of structures." Journal of Physics: Conference Series 2131, no. 3 (December 1, 2021): 032010. http://dx.doi.org/10.1088/1742-6596/2131/3/032010.
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Abstract The paper formulates the principles for shaping the design input, in particularly that the design input is not required to be similarto the real input. It is suggested that the seismic input should be set as a sinusoidal segment. This requires that the sinusoid be hazardous to the structure and causes it to reach the same limit state as a real earthquake. The amplitude of the sine wave is set equal to the average value of the peak boosts. The frequency of the exposure is set as dangerous for the structure to be designed and the duration is set according to the frequency of the exposure. The proposed seismic modelling approach makes it possible to assess the potential for progressive collapse and low-cycle fatigue of the designed structure. The model is based on statistical data on past earthquakes to estimate the average level of peak accelerations and the correlation between the prevailing period and the duration of the seismic event. The proposed input model greatly simplifies the computational assessment of seismic stability and the modeling of inputs on the seismic platform.
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Liu, Yue Wei, and Yang Zhou. "Seismic Rotations and Rotational Seismic Input for Building Design." Applied Mechanics and Materials 405-408 (September 2013): 1953–56. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1953.
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The rotational seismic inputs for building design were discussed. The free ground rotations and the relation between free ground rotations and basement rotations were derived. The results show that the relation depends on the basement size, site and seismic frequency. For most building, the differences between the free ground rotations and the basement rotations are small. The suggestion is that for tall buildings the free ground rotations can be taken as the seismic input, but for low-rise building with large basement, the response spectra in short period region should be reduced.
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Xu, Yang, Jun Zhao, Xiao Yan Xu, and Dan Zhu. "Response Spectrum Analysis of a Large-Span Hangar Subjected to Multi-Dimensional Seismic Inputs." Advanced Materials Research 639-640 (January 2013): 906–10. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.906.
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The multi-dimensional seismic response of a single-span hangar was studied by response spectrum analysis method. The lateral displacements of the structure, forces of its supporting columns and its roof structure were calculated and compared with each other for cases of one-, two- and three-dimensional (1D, 2D and 3D) seismic inputs. The results show that, compared with the case of 1D earthquake input, the effects of horizontally 2D earthquake inputs on the internal forces and displacements of its supporting columns in the primary direction of input are obvious when it is along the symmetrical axis of the hangar and their effects in the secondary direction of input are even more important which results in great increases of the internal forces and displacements in that direction. The vertical seismic input has almost no effect on the internal forces and displacements of columns. The internal forces in different parts of the roof structure are controlled by horizontal or vertical inputs, respectively, and, compared with those from horizontally or vertically 1D inputs, the responses from 3D inputs are increased and the effects should be considered in seismic design.
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Uzdin, Alexander, and Sergei Prokopovich. "Some principles of generating seismic input for calculating structures." E3S Web of Conferences 157 (2020): 06021. http://dx.doi.org/10.1051/e3sconf/202015706021.
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In this paper different models of seismic input are analyzed. The most essential characteristics of seismic effects are peak ground acceleration, peak ground velocity, peak ground displacement, Arias intensity, cumulative absolute velocity, seismic energy density, harmonic coefficient κ, pseudo spectral kinematic characteristics, root-mean-square peak kinematic characteristics, plastic forces work and damage spectrum. The influence of seismic impulse on characteristics of seismic input is studied. A.A. Dolgaya’s and L.N. Dmitrovskaya’s models with seismic impulse are compared. L.N. Dmitrovskaya’s model allows to reach estimated values of energy characteristics of seismic input with the smallest deviation. When generating such processes, it is important to take into account both the properties of real actions and the limiting state of the calculated structure. The considered models of seismic inputs should be applied in the following cases: a) in case of designing mass construction projects when it is not possible to get a package of design accelerograms, b) in typical designing when the design object can be located on sites with different seismic and geological conditions, c) at early stages of designing important objects when the package of design accelerograms is not available yet but it is necessary to make technical solutions.
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Sari, Anggun Mayang, and Afnindar Fakhrurrozi. "SEISMIC HAZARD MICROZONATION BASED ON PROBABILITY SEISMIC HAZARD ANALYSIS IN BANDUNG BASIN." RISET Geologi dan Pertambangan 30, no. 2 (December 30, 2020): 215. http://dx.doi.org/10.14203/risetgeotam2020.v30.1138.
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The geological and seismic-tectonic setting in the Bandung Basin area proliferates the seismicity risk. Thus, it is necessary to investigate the seismic hazards caused by the foremost seismic source that affects the ground motions in the bedrock. This research employed Probability Seismic Hazard Analysis (PSHA) method to determine the peak ground acceleration value. It considers the source of the earthquakes in the radius of 500 km with a return period of 2500 years. The analysis results showed that the Peak Ground Acceleration (PGA) in this region varies from 0.46 g to 0.70 g. It correlates with the magnitude and hypocentre of the dominant earthquake source of the study locations. The PGA value on the bedrock was used as an input to develop the seismic hazard microzonation map. It was composed using the Geographic Information System (GIS) to visualise the result. This research provides a scientific foundation for constructing residential buildings and infrastructure, particularly as earthquake loads in the building structure design calculations. ABSTRACT - Mikrozonasi Bahaya Seismik Berdasarkan Probability Seismic Hazard Analysis di Cekungan Bandung. Kondisi geologi dan seismik-tektonik di Cekungan Bandung meningkatkan risiko kegempaan di wilayah tersebut. Oleh karena itu, perlu dilakukan penelitian tentang bahaya seismik yang disebabkan oleh sumber-sumber gempa di sekitarnya yang mempengaruhi gelombang gempa di batuan dasar. Penelitian ini menggunakan metode Probability Seismic Hazard Analysis (PSHA) untuk menentukan nilai percepatan gelombang gempa di batuan dasar. Lebih lanjut penelitian ini menggunakan sumber gempa dalam radius 500 km dengan periode perulangan 2500 tahun. Hasil analisis menunjukkan bahwa Peak Ground Acceleration (PGA) di wilayah ini bervariasi dari 0,46 g hingga 0,70 g. Hal ini berkorelasi dengan magnitudo dan jarak hiposenter sumber gempa dominan terhadap lokasi penelitian. Nilai PGA di batuan dasar digunakan sebagai input data dalam pembuatan peta mikrozonasi bahaya seismik. Peta mikrozonasi bahaya seismik disusun dan divisualisasikan menggunakan Sistem Informasi Geografis (SIG). Luaran penelitian ini menghasilkan landasan ilmiah pada konstruksi bangunan tempat tinggal dan infrastruktur, khususnya sebagai pembebanan gempa dalam perhitungan desain struktur bangunan.
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Panza, G. F., F. Vaccari, G. Costa, P. Suhadolc, and D. Fäh. "Seismic Input Modelling for Zoning and Microzoning." Earthquake Spectra 12, no. 3 (August 1996): 529–66. http://dx.doi.org/10.1193/1.1585896.
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The strong influence of lateral heterogeneities and of source properties on the spatial distribution of ground motion indicates that the traditional methods require an alternative when earthquake records are not available. The computation of broadband synthetic seismograms makes it possible, as required by a realistic modelling, to take source and propagation effects into account, fully utilizing the large amount of geological, geophysical and geotechnical data, already available. For recent earthquakes, where strong motion observations are available, it is possible to validate the modelling by comparing the synthetic seismograms with the experimental records. The realistic modelling of the seismic input has been applied to a first-order seismic zoning of the whole territory of several countries. Even though it falls in the domain of the deterministic approaches, the method is suitable to be used in new integrated procedures which combine probabilistic and deterministic approaches and allow us to minimize the present drawbacks which characterise them when they are considered separately. Detailed modelling of the ground motion for realistic heterogeneous media (up to 10 Hz) can be immediately used in the design of new seismo-resistant constructions and in the reinforcement of existing buildings, without having to wait for a strong earthquake to occur. The discrepancies between the ground responses computed with standard methods and the results of our detailed modelling cannot be ignored when formulating building codes and retrofitting the built environment.
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Shargh, Ghasem Boshrouei, and Reza Barati. "Estimation of inelastic seismic input energy." Soil Dynamics and Earthquake Engineering 142 (March 2021): 106505. http://dx.doi.org/10.1016/j.soildyn.2020.106505.
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Eguchi, Ronald T. "Seismic hazard input for lifeline systems." Structural Safety 10, no. 1-3 (May 1991): 193–98. http://dx.doi.org/10.1016/0167-4730(91)90014-z.
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Langer, H. "Input parameters for estimating seismic loading." Natural Hazards 3, no. 2 (1990): 125–39. http://dx.doi.org/10.1007/bf00140427.
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Teng, Xiaofei, Ping Tan, Dewen Liu, Linli Zhou, Jianmin Jin, Huating Chen, and Yanhui Liu. "Influence of different seismic motion input modes on the performance of isolated structures with different seismic measures." Open Physics 18, no. 1 (August 18, 2020): 448–58. http://dx.doi.org/10.1515/phys-2020-0140.
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AbstractIn order to obtain the influence of different seismic motion input modes on the performance of isolated structures with different seismic measures, the two aspects from near-fault seismic motion velocity pulse input and different dimension seismic motion input modes are studied. The finite element model of traditional seismic and base isolation frame structure with different aspect ratios is established. The actual near-seismic strong earthquake record with forward directional effect and slipping speed pulse is used as the input method of structural seismic motion to carry out nonlinear dynamics. The different dimensional seismic motion input method is selected as the quantitative, the tensile–compression stiffness ratio is the variable, and the time-history analysis of the isolation performance of a high-rise isolated structure is carried out. The experimental results show that for structures with an aspect ratio H/B of 1, 2, 3, and 4, the smaller the aspect ratio is, the better the damping effect is; the different dimensional vibration input has less isolation performance for the isolation bearing. From small to large, it is: one-dimensional vibration input, two-dimensional vibration input, three-dimensional vibration input.
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Du, Min, Xiao Yun Guo, and Yan Zhao. "Ground Motion Parameters Influences on Input Seismic Energy." Applied Mechanics and Materials 204-208 (October 2012): 2520–23. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2520.
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Based on the energy analysis of a multi-degree-of-freedom (MDOF) system, a mode decomposition method for the input seismic energy is proposed, which substitutes a MDOF system with equivalent single-degree-of-freedom (SDOF) systems. The input seismic energy is obtained, using the actual earthquake data. The influence of ground motion parameters is analyzed. The results show that the seismic input energy increases proportionally with the square of ground motion acceleration peak. The bigger the predominant period is, the more the input seismic energy is.
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Xia, Chen, Chengzhi Qi, and Xiaozhao Li. "Viscoelastic Boundary Conditions for Multiple Excitation Sources in the Time Domain." Mathematical Problems in Engineering 2018 (October 10, 2018): 1–11. http://dx.doi.org/10.1155/2018/7982342.
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Transmitting boundaries are important for modeling the wave propagation in the finite element analysis of dynamic foundation problems. In this study, viscoelastic boundaries for multiple seismic waves or excitations sources were derived for two-dimensional and three-dimensional conditions in the time domain, which were proved to be solid by finite element models. Then, the method for equivalent forces’ input of seismic waves was also described when the proposed artificial boundaries were applied. Comparisons between numerical calculations and analytical results validate this seismic excitation input method. The seismic response of subway station under different seismic loads input methods indicates that asymmetric input seismic loads would cause different deformations from the symmetric input seismic loads, and whether it would increase or decrease the seismic response depends on the parameters of the specific structure and surrounding soil.
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Klügel, Jens-Uwe, Richard Attinger, and Shobha Rao. "Adjusting Fragility Analysis to Seismic Hazard Input." Journal of Disaster Research 5, no. 4 (August 1, 2010): 395–406. http://dx.doi.org/10.20965/jdr.2010.p0395.
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This paper shows that the results of contemporary probabilistic seismic hazard analysis (PSHA), uniform hazard spectra, and hazard curves are inconsistent with the fragilitymethod used for seismic probabilistic risk assessment (PRA). The calculation used in PSHA is based on the evaluation of the probability of exceeding specified acceleration levels without considering the damaging effects of earthquakes. Empirical fragility of structures and components derived from field observations or qualification tests is conditioned to model large earthquakes, so fragility analysis must be adjusted to correspond with PSHA hazard estimates. Adjustment based on energy absorption principles is presented in the sections that follow, andmacroseismic information from intensity is used for verification. The procedure suggested was applied in seismic probabilistic risk assessment for the Goesgen, Switzerland, nuclear power plant (NPP).
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Yan, Xian Li, Qing Ning Li, Fan Yang, Chang Gao, and Lei Wei. "Seismic Response Analysis of the Curved Bridges with Different Line Shapes." Applied Mechanics and Materials 204-208 (October 2012): 2501–4. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2501.
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Two curved bridges with typical line shapes: C shaped curved bridge and S shaped curved bridge were selected to study the influence of line shapes on the dynamic parameters of the curved bridge. Spatial finite element analysis models were established and the seismic responses of the two bridges in different earthquake input directions were studied by the elastic dynamic time history method. Results show that: except for the first natural period, the rest natural periods of the two bridges are basically the same; the earthquake resistant capability of the C shaped curved bridge is worse than that of the S shaped curved bridge; under earthquake, the control input direction is Y-direction, and the control internal force is the axial force-Fx, shear Fy, and the moment Mz; relative to the horizontal seismic inputs, the internal force produced by the vertical seismic input is very small, and it can be resisted by structural measures in seismic design.
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NAKAI, Kentaro, and Toshihiro NODA. "SEISMIC ASSESSMENT OF INPUT SEISMIC WAVES ON GROUND-CHIMNEY INTERACTION SYSTEM." Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 72, no. 2 (2016): I_409—I_418. http://dx.doi.org/10.2208/jscejam.72.i_409.
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Li, Yu, Yan Yang Che, and Sen Wang. "Improved Seismic Checking for Pier Based on Seismic Energy Response Method." Applied Mechanics and Materials 455 (November 2013): 224–27. http://dx.doi.org/10.4028/www.scientific.net/amm.455.224.
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Based on prophase research work, seismic checking for pier based on energy method is improved. The seismic input energy demand of pier is determined by using the seismic input energy response spectra and hysteretic energy dissipation spectra of sing-degree-of-freedom. Meanwhile, the Pushover Method is used to determine the hysteretic deformation capacity of pier. Then, based on the equilibrium principal between hysteretic deformation capacity and seismic input energy demand of pier, seismic checking for pier is carried on. Then, this improved seismic checking for pier based on energy method is applied in the design examples of piers. Comparing with the calculation of nonlinear time history analyses, it is known that improved seismic checking for pier based on energy method can evaluate the seismic performance of pier effectively. So, these valuable results can provide the meaningful reference for the seismic design of bridge engineering.
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Zhou, Yundong, Yongxin Wu, Ziheng Shangguan, and Zhanbin Wang. "Effects of Spatially Varying Seismic Ground Motions and Incident Angles on Behavior of Long Tunnels." Advances in Civil Engineering 2018 (June 11, 2018): 1–6. http://dx.doi.org/10.1155/2018/8195396.
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Seismic behavior of long circle tunnels is significantly influenced by the nature of input motion. This study, based on the 3D finite-element method (FEM), evaluates the effects of spatially varying seismic ground motions and uniform input seismic ground motions and their incident angles on the diameter strain rate and tensive/compressive principal stresses under different strata. It is found that (1) the spatially varying seismic ground motions induced larger diameter strain rate (radially deformation) than the uniform input seismic motion, (2) the spatially varying seismic ground motions had an asymmetric effect on the radial strain rate distributions, and (3) the rising incident angles changed the pure shear stress state into a complex stress state for tunnels under specified input motion.
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Nowak, Paul S., and John F. Hall. "Arch Dam Response to Nonuniform Seismic Input." Journal of Engineering Mechanics 116, no. 1 (January 1990): 125–39. http://dx.doi.org/10.1061/(asce)0733-9399(1990)116:1(125).
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Teruna, Daniel Rumbi. "The Use Of Seismic Energy And Damage Index For Assesment Seismic Performance Of Building Under Seismic Excitation." Talenta Conference Series: Energy and Engineering (EE) 1, no. 1 (October 16, 2018): 145–53. http://dx.doi.org/10.32734/ee.v1i1.125.
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Seismic input energy is transmitted into building consists of the kinetic energy, elastic strain energy, damping energy, and hysteretic energy. The amount of the input energy induced by earthquake transmitted into a building depends on earthquake characteristics and building dynamic properties. In this context, the hysteretic energy directly associated with damage to structural members through a parameter which known as the damage index were introduced. For this purposes, influence of earthquake characteristic on energy spectra for SDOF system were described and presented. In addition, influence of structural dynamic properties are also described and discussed. Next, to assess the damage potential to a building under seismic excitation, four story steel moment resisting frame were investigated under three selected ground motion records matching to the response spectra design the new Indonesian code. Furthermore, nonlinear dynamic time history analysis were performed using ABAQUS to obtain responses parameters in term of base shear, drift, input and hysteretic energy. Finally, the seismic performance of the building based on Park and Ang damage index model is presented and summarized.
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Zhang, Yun, Pin Tan, and Xiao Rong Zhou. "The Research of Input Ground Motion on Seismic Fragility Analysis of Bridges." Advanced Materials Research 490-495 (March 2012): 1826–30. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1826.
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Analyzed the importance of selecting reasonably ground motion input in seismic fragility analysis of the bridge. Based on the common methods of synthesis artificial seismic wave which used trigonometric series and according to the characters of Fourier series, extracted phase spectrum from practical seismic waves ,through modulating the Fourier amplitude spectrum, obtained the artificial seismic wave which fitted compatible with the design response spectrum. Similar to nature small earthquake records, it has the character of non-stationary on time-domain and frequency-domain. Synthesize a series of artificial seismic waves in this method, can improve the accuracy and pertinence of the bridge seismic fragility.
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Pan, Hongke, and Xinxin Jiang. "On the Characteristics of Ground Motion and the Improvement of the Input Mode of Complex Layered Sites." Civil Engineering Journal 6, no. 5 (May 1, 2020): 848–59. http://dx.doi.org/10.28991/cej-2020-03091512.
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It is a hot research topic to perform the dynamic interaction analysis between the engineering structure and the soil by using the time-domain method. This paper studies the seismic behaviour of the layered sites and the seismic response of the structures using the viscous-spring artificial boundary theory. The artificial boundary model of viscous-spring is initially based on homogeneous foundation. For the layered site (Foundation), the traditional homogeneous model or equivalent load input mode is not suitable, which may bring great error. By introducing the changes of coefficients and phases of reflection and transmission of seismic waves at the interface between layers, an improved method of equivalent load input mode of traditional viscous-spring artificial boundary model is proposed. This new wave model can simulate the propagation law of seismic wave in layered site more accurately, which is available for the seismic performance of engineering structure under the condition of large and complex layered site. At last, the simplified homogeneous model, the equivalent load input method and the improved layered model input method are used to study the seismic response of the engineering example. It is shown that the results calculated by the three methods are different, which shows that the homogeneous foundation model and the conventional equivalent load input method of seismic wave cannot simulate the seismic force accurately, whereas the improved wave input model can better reflect the characteristic of traveling wave in layered sites.
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Li, Yu, Hua Bai, and Tao Wang. "Effect of Seismic Characteristics on Seismic Energy Response of Bridge." Advanced Materials Research 413 (December 2011): 46–50. http://dx.doi.org/10.4028/www.scientific.net/amr.413.46.
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The energy equations of MDOF bridges are established based on the energy equilibrium theory. With considering the seismic characteristics, the FEA model of one double-column pier of passenger dedicated line is established in order to research the seismic energy response and its distribution rules when MDOF bridges entry the nonlinear state. The study results are obtained as follow: Bridge subjected to minor ground motion is depended on damping energy dissipation to consume seismic input energy. On the contrary, a large number of inelastic deformation is generated when bridge is subjected to strong ground motion. So the seismic input energy is mainly consumed by hysteretic energy dissipation. So, some meaningful references are provided for the seismic design for bridge by using energy concept.
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Zhao, Tao, Fangyu Li, and Kurt J. Marfurt. "Seismic attribute selection for unsupervised seismic facies analysis using user-guided data-adaptive weights." GEOPHYSICS 83, no. 2 (March 1, 2018): O31—O44. http://dx.doi.org/10.1190/geo2017-0192.1.
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With the rapid development in seismic attribute and interpretation techniques, interpreters can be overwhelmed by the number of attributes at their disposal. Pattern recognition-driven seismic facies analysis provides a means to identify subtle variations across multiple attributes that may only be partially defined on a single attribute. Typically, interpreters intuitively choose input attributes for multiattribute facies analysis based on their experience and the geologic target of interest. However, such an approach may overlook unsuspected or subtle features hidden in the data. We therefore augment this qualitative attribute selection process with quantitative measures of candidate attributes that best differentiate features of interest. Instead of selecting a group of attributes and assuming all the selected attributes contribute equally to the facies map, we weight the interpreter-selected input attributes based on their response from the unsupervised learning algorithm and the interpreter’s knowledge. In other words, we expect the weights to represent “which attribute is ‘favored’ by an interpreter as input for unsupervised learning” from an interpretation perspective and “which attribute is ‘favored’ by the learning algorithm” from a data-driven perspective. Therefore, we claim the weights are user guided and data adaptive, as the derivation of weight for each input attribute is embedded into the learning algorithm, providing a specific measurement tailored to the selected learning algorithm, while still taking the interpreter’s knowledge into account. We develop our workflow using Barnett Shale surveys and an unsupervised self-organizing map seismic facies analysis algorithm. We found that the proposed weighting-based attribute selection method better differentiates features of interest than using equally weighted input attributes. Furthermore, the weight values provide insights into dependency among input attributes.
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Park, Ji-Hun, Dong-Hyun Shin, and Seong-Ha Jeon. "Seismic Fragility and Risk Assessment of a Nuclear Power Plant Containment Building for Seismic Input Based on the Conditional Spectrum." Applied Sciences 12, no. 10 (May 20, 2022): 5176. http://dx.doi.org/10.3390/app12105176.
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A procedure for the seismic fragility assessment of nuclear power plants by applying ground motions compatible with the conditional probability distribution of a conditional spectrum (CS) is presented with a case study of a containment building. Three CSs were constructed using different control frequencies to investigate the influence of the control frequency. Horizontal component-to-component directional variability was introduced by randomly rotating the horizontal axes of the recorded ground motions. Nonlinear lumped mass stick models were constructed using variables distributed by Latin hypercube sampling to model the uncertainty. An incremental dynamic analysis was performed, and seismic fragility curves were calculated. In addition, a seismic input based on a uniform hazard response spectrum (UHRS) was applied to the seismic fragility assessment for comparison. By selecting a control frequency dominating the seismic response, the CS-based seismic input produces an enhanced ‘high confidence of low probability of failure’ capacity and lower seismic risk than the UHRS-based seismic input.
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Puspasari, Trevi Jayanti, and Sumirah Sumirah. "APLIKASI METODE PSEUDO 3D SEISMIK DI CEKUNGAN JAWA BARAT UTARA MENGGUNAKAN K.R. BARUNA JAYA II." Oseanika 1, no. 2 (January 14, 2021): 1–12. http://dx.doi.org/10.29122/oseanika.v1i2.4562.
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ABSTRAK
Tuntutan untuk mengikuti perkembangan kebutuhan industri migas menjadi motivasi dalam mengembangkan teknik penerapan dan aplikasi akuisisi seismik multichannel 2D. Perkembangan kebutuhan eksplorasi industri migas tidak diimbangi dengan anggaran peningkatan alat survei seismik milik negara termasuk yang terpasang di K.R. Baruna Jaya II – BPPT. Penerapan metode pseudo 3D pada disain survei dan pengolahan data dapat menjadi solusi efektif dan efisien dalam mengatasi persoalan tersebut. Metode Pseudo 3D merupakan suatu teknik akuisisi dan pengolahan data dengan menitik beratkan pada disain akuisisi dan inovasi pengolahan data seismik 2D menghasilkan penampang keruangan (3D) berdasarkan input data seismik yang hanya 2D. Penelitian ini bertujuan untuk mengaplikasikan metode pseudo 3D seismik di Cekungan Jawa Barat Utara menggunakan wahana KR. Baruna Jaya II yang dilakukan pada Desember 2009. Sebagai hasil, pengolahan data 2D lanjutan telah dilakukan dan diperoleh profil penampang seismik keruangan (3D). Profil hasil pengolahan data Pseudo 3D ini dapat menjadi acuan dalam pengambilan keputusan dan rencana survei berikutnya.
Kata Kunci: Seismik Pseudo 3D, Seismik multichannel 2D, K.R. Baruna Jaya II, Cekungan Jawa Barat Utara.
ABSTRACT
[Aplication of Seismic Pseudo 3D in Nort West Java Basin Using K.R. Baruna Jaya II]
The demand to follow the growth of needs in the oil and gas industry is a motivation in the developing of techniques for assessment and applying 2D multichannel seismic acquisition. The development of exploration needs for the oil and gas industry is not matched by budget for an upgrade Government’s seismic equipment including equipment installed in K.R. Baruna Jaya II. Applied Pseudo 3D method in survey and seismic data processing can be an effective and efficient solution. The pseudo 3D method is a data acquisition and processing technique with an emphasis on the acquisition design and 2D seismic data processing innovation to produce a 3D seismic volume. This study aims to apply the pseudo 3D seismic method in the North West Java Basin using the K.R. Baruna Jaya II which was held in Desember 2009. As a Result, advanced seismic processing was carried out to output a seismic volume (3D) profile. This profile can be used as a reference in making decisions and planning the next survey.
Keywords: Pseudo 3D Seismic, Seismic 2D multichannel, K.R. Baruna Jaya II, Nort West Java Basin.
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Vaseghi Amiri, J., G. Ghodrati Amiri, and B. Ganjavi. "Seismic vulnerability assessment of multi-degree-of-freedom systems based on total input energy and momentary input energy responses." Canadian Journal of Civil Engineering 35, no. 1 (January 2008): 41–56. http://dx.doi.org/10.1139/l07-085.
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In energy-based seismic evaluation and design, input energy as a seismic demand parameter and hysteretic energy are two important factors. Previous studies for seismic assessment and design based on energy approach have been generally limited to single-degree-of-freedom (SDOF) structures. The purpose of this paper is to find a suitable energy-based parameter for estimation of the damaging potential of ground motion in reinforced concrete frames of multi-degree-of-freedom (MDOF) systems. In this regard, 40 common reinforced concrete frames subjected to four different earthquakes have been analyzed. The results indicate that maximum momentary input energy is a more appropriate parameter than maximum total input energy for estimation of structural damage in short-duration earthquakes or those in which the major damage to structures happens within a short duration of ground motion. In addition, in earthquakes with a wide frequency range, the predominant period of ground motion in Fourier spectrum is shown to be the period corresponding to maximum input energy.
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Rabinowitz, Nitzan, and David M. Steinberg. "Seismic hazard sensitivity analysis: A multi-parameter approach." Bulletin of the Seismological Society of America 81, no. 3 (June 1, 1991): 796–817. http://dx.doi.org/10.1785/bssa0810030796.
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Abstract We propose a novel multi-parameter approach for conducting seismic hazard sensitivity analysis. This approach allows one to assess the importance of each input parameter at a variety of settings of the other input parameters and thus provides a much richer picture than standard analyses, which assess each input parameter only at the default settings of the other parameters. We illustrate our method with a sensitivity analysis of seismic hazard for Jerusalem. In this example, we find several input parameters whose importance depends critically on the settings of other input parameters. This phenomenon, which cannot be detected by a standard sensitivity analysis, is easily diagnosed by our method. The multi-parameter approach can also be used in the context of a probabilistic assessment of seismic hazard that incorporates subjective probability distributions for the input parameters.
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Xu, Bin, Yang Zhou, Chenguang Zhou, Xianjing Kong, and Degao Zou. "Dynamic responses of concrete-faced rockfill dam due to different seismic motion input methods." International Journal of Distributed Sensor Networks 14, no. 10 (October 2018): 155014771880468. http://dx.doi.org/10.1177/1550147718804687.
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The concrete-faced rockfill dam valley foundation was considered as an open energy system and a reasonable non-uniform seismic motion input method was applied to the dynamic analysis of a concrete-faced rockfill dam based on the generalized plastic model. First, the corresponding program was validated by means of the scattering question of an idealized semicircle valley. Subsequently, the seismic elasto-plastic finite element analyses were performed to compare and investigate the performances of a concrete-faced rockfill dam under different seismic motion input methods. The results show that the dynamic responses of the concrete-faced rockfill dam are decreased by 10%–30% approximately with the use of non-uniform seismic motion input method. As a result, the traditional uniform seismic motion input method would overestimate the responses of the dam. From the perspective of seismic safety evaluation, the overestimations would disturb the reasonable assessment of the aseismic capacity of the dam. Moreover, the slope stability analysis results might be conservative and unreasonable due to overestimating the accelerations during the earthquake.
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Al-Hunaidi, M. O., Ikuo Towhata, and Kenji Ishihara. "Modification of Seismic Input for Fully Discretized Models." Soils and Foundations 30, no. 2 (June 1990): 114–18. http://dx.doi.org/10.3208/sandf1972.30.2_114.
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Viti, Stefania, Marco Tanganelli, Vittorio D’intinosante, and Massimo Baglione. "Effects of Soil Characterization on the Seismic Input." Journal of Earthquake Engineering 23, no. 3 (September 21, 2017): 487–511. http://dx.doi.org/10.1080/13632469.2017.1326422.
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Jeong, C., and E. Esmaeilzadeh Seylabi. "Seismic Input Motion Identification in a Heterogeneous Halfspace." Journal of Engineering Mechanics 144, no. 8 (August 2018): 04018070. http://dx.doi.org/10.1061/(asce)em.1943-7889.0001495.
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Kori, Jagadish G., and R. S. Jangid. "Semi-active MR dampers for seismic control of structures." Bulletin of the New Zealand Society for Earthquake Engineering 42, no. 3 (September 30, 2009): 157–66. http://dx.doi.org/10.5459/bnzsee.42.3.157-166.
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Magnotorheological (MR) dampers have been demonstrated to be more effective in reducing the structural response due to earthquakes using only a small amount of external power. The performance of MR damper depends upon type of control law used and the damper force is directly depends on the input command voltage. The purpose of this study is to evaluate the effectiveness of input command voltage on MR damper system against recently proposed control laws under different earthquakes. The magnitude of control force increases with the increase in the input command voltage of MR damper, however for the different damper locations and configurations maximum command voltage to the current driver may not always effective in reducing the structural responses. To investigate the effective performance of the MR dampers, different control algorithms with multiple MR damper locations are considered in this study. A phenomenological model of a shear- mode MR damper, based on a Bouc–Wen element, is employed in the analysis of the controlled building. The control algorithms are tested on a five-story framed building and parametric study on variation in the input command voltage is conducted for different real earthquake ground motions. The numerically evaluated optimum parametric values are considered for the analysis of the different damper locations in the building in order to reduce the displacement, acceleration and the base shear of the building. It is shown numerically that the performance of the MR damper has a great potential in suppressing structural vibrations over a wide range of seismic inputs by selecting appropriate optimum input command voltages.
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Witarsa, Jarnal, Dwi Pujiastuti, and Elistia Liza Namigo. "Karakterisasi Reservoar Hidrokarbon Menggunakan Atribut Energi dan Metode Seismic Coloured Inversion (SCI) Pada Lapangan Penobscot Kanada." Jurnal Fisika Unand 8, no. 2 (April 1, 2019): 113–19. http://dx.doi.org/10.25077/jfu.8.2.113-119.2019.
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Telah dilakukan karakterisasi reservoar hidrokarbon pada Lapangan Penobscot Kanada menggunakan atribut energi dan metode Seismic Coloured Inversion (SCI) di sepanjang inline 1284 m. Penelitian ini menggunakan data seismik post stack sebagai data input dan data sumur sebagai data kontrol untuk menentukan nilai impedansi akustik (AI). Analisis sensitivitas log yang digunakan menunjukkan bahwa gamma ray log lebih sensitif dalam pemisahan lapisan sand dan shale. Analisis atribut energi dilakukan untuk meningkatkan resolusi vertikal dari penampang seismik untuk menentukan zone of interest. Analisis inversi SCI dilakukan untuk melihat pola sebaran nilai AI pada penampang seismik yang diteliti. Dari hasil inversi SCI terhadap penampang seismik diperoleh nilai AI antara 2,00 x 106 kg/m2s sampai 5,56 x 106 kg/m2s. Hal ini menunjukkan bahwa pada penampang seismik yang diteliti terdapat potensi reservoar hidrokarbon.Kata kunci: atribut energi, Seismic Coloured Inversion (SCI), Acoustic Impedance (AI), Zone Of Interest.
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Zhao, Yingying, Weiming Gong, Xianzhang Ling, Peng Li, Ziyu Wang, and Hong Fan. "Model Test on the Vibration Reduction Characteristics of a Composite Foundation with Gravel Cushion under Different Seismic Wave Amplitudes." Shock and Vibration 2021 (February 6, 2021): 1–13. http://dx.doi.org/10.1155/2021/6696031.
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Gravel cushions have been introduced as a practical and efficient seismic isolation technology to ensure the safety of nuclear power plants. This study investigated the seismic isolation effect of a gravel cushion by conducting a series of shaking table tests on a model foundation with a cushion built of three different types of graded aggregates (single-sized (2–5 mm), two-sized (2–5 mm:5–10 mm = 3 : 1), and continuously graded) under input El Centro seismic waves with three different peak accelerations (0.1 g, 0.2 g, and 0.3 g). The testing results showed that the seismic isolation effect of the gravel cushion increased with the peak seismic acceleration. The gravel cushion built with single-sized aggregates had better seismic isolation performance than gravel cushions built with two-sized or continuously graded aggregates. Under input seismic waves with 0.1 g peak acceleration, the single-sized aggregate gravel cushion still had a seismic isolation effect with a vibration reduction rate of approximately 11.81%, whereas the other two gravel cushions had no effect. Under input seismic waves with peak accelerations of 0.2 g and 0.3 g, all three gravel cushions had seismic isolation effects with vibration reduction rates of approximately 18.63% and 17.92%, respectively. An empirical model is proposed for predicting the vibration reduction rate of the cushion. Under input seismic waves with 0.3 g peak acceleration, the ultimate vibration reduction rate of the gravel cushion fell between 20.44% and 31.33%. The gravel cushion is an excellent option for nuclear power plant foundations with high requirements for seismic isolation, provided that the required bearing capacity is satisfied.
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Liu, Tong, Fuwang Xu, Qinghe Wang, and Huaiyu Xu. "Structural dynamic response of underground structure with vertical ground motion input." E3S Web of Conferences 293 (2021): 02016. http://dx.doi.org/10.1051/e3sconf/202129302016.
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Since many cases of structural damage in past earthquakes have been attributed to strong vertical ground motion, our understanding of vertical seismic load effects and their influence on seismic performance of subway station structure is limited. In this study, the Daikai subway station is taken as a typical example. A two-dimensional finite element model of both soil and structure was established using finite element software ABAQUS. Two input approaches of ground motion are considered, including the horizontal component alone and the vertical and horizontal motions simultaneously. Four groups of ground motion records are selected according to the site type of this station and scaled to the strong intensity which can make the station damage. Results show that the vertical seismic load increases the axial force of the column component apparently, while horizontal seismic load has little effect on axial compression ratio.
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Lv, Liang, Bin Liang, and Wen Sheng Wang. "Research on Seismic Displacement Response of Cable Stayed Bridge without Back Stays." Advanced Materials Research 919-921 (April 2014): 1039–42. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1039.
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Seismic displacement response of cable stayed bridge without back stays was studied in this paper. Based on the cable stayed bridge without back stays on Zhenshui Road in Xinmi City, finite element method (FEM) was applied to calculate and analyze natural vibration and peak displacement response of the structure. The results show that with regard to mid-span and consolidation of pier and main tower, uniaxial seismic wave input results in peak displacement response of corresponding direction is bigger than that of any other direction. Peak displacement response of the top of the main tower is bigger than those of mid-span and consolidation of pier and main tower in any seismic wave input cases, which indicates that the top of the tower needs to be focused in the process of design and construction. Seismic wave along triaxial direction has the biggest impact on the structure. Keywords: cable stayed bridge without back stays; seismic displacement response; seismic wave input; peak displacement response
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Cheng, Yin, Chao-Lie Ning, and Wenqi Du. "Spatial Cross-Correlation Models for Absolute and Relative Spectral Input Energy Parameters Based on Geostatistical Tools." Bulletin of the Seismological Society of America 110, no. 6 (August 18, 2020): 2728–42. http://dx.doi.org/10.1785/0120200142.
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ABSTRACT In recent years, energy-based seismic design methodology has received increasing attention because it takes into account not only the force and displacement behavior of a structure but also the cumulative damage effect caused by seismic loading. Specifically, as a fundamental parameter, input energy parameters (both absolute and relative measures) are directly related to the cumulative damage potential; therefore, they are commonly used in energy-based seismic design and seismic risk assessment. This study thus proposes new spatial cross-correlation models for absolute and relative elastic input energy parameters, using 2219 ground-motion records selected from 12 earthquake events. The normalized within-event residuals for both absolute and relative measures are first calculated. Semivariogram analysis is then conducted to quantify the spatial correlation of residuals for the input energy parameters at multiple sites and multiple periods. The linear model of coregionalization (LMC) approach is adopted to fit the empirical data; it is observed that the proposed LMC-based function performs reasonably well in capturing the spatial variability of the input energy measures. The influence of regional site conditions on the spatial cross correlation of input energy parameters is also investigated, and generic models are proposed using the averaged standardized coregionalization matrices of 12 events. The spatial cross-correlation models developed for input energy parameters can be used in regional seismic risk assessment within an energy-based framework.
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Zhan, Yong Xiang, Hai Lin Yao, and Guan Lu Jiang. "Characteristics of Liquefaction Resistance for the Saturated Silty Soil Ground Treated by Compacted Gravel Pile Composite Foundation." Advanced Materials Research 446-449 (January 2012): 2573–76. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.2573.
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Based on Beijing-Shanghai high speed railway, the numerical simulation mainly researched on the seismic behavior for the saturated silty soil ground, which was treated by compacted gravel pile composite foundation. It has been analyzed that the region of liquefaction distribution and the transferring rule of excess pore water pressure under a series of input acceleration seismic loads in the treated and untreated foundation. The research results indicate that the untreated saturated silty soil ground is almost whole liquefaction when the amplitude of input acceleration is more than 0.15 g. While for compacted gravel pile composite foundation, out of treated region is less liquefaction when the amplitude of input acceleration is 0.15 g, with the increasing of input acceleration, liquefaction region is further more and gradually expands to the inner soil between piles, and compacted gravel pile composite foundation is only partial liquefaction when the amplitude of input acceleration is 0.25g. Excess pore water pressure is increased with the increasing of input acceleration seismic load, and the increasing of excess pore water pressure can be restrained effectively by compacted gravel pile composite foundation, and the quality of liquefaction resistance is improved. The design of compacted gravel pile composite foundation can satisfy the seismic requirements of Beijing-Shanghai high speed railway under the condition of 7 degree seismic fortification.
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Nes, O. M., R. M. Holt, and E. Fjær. "The Reliability of Core Data as Input to Seismic Reservoir Monitoring Studies." SPE Reservoir Evaluation & Engineering 5, no. 01 (February 1, 2002): 79–86. http://dx.doi.org/10.2118/76641-pa.
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Summary There is a potential for improving the reliability of standard core tests for seismic monitoring studies. A primary concern is the ability to quantify and correct for core-damage effects, which significantly enhance the stress dependency of wave velocities. This problem is most relevant for relatively low-strength rocks cored in high-stress environments. We have used synthetic sandstones formed under stress to perform a systematic study of stress-release- induced core-damage effects. The results show that careful laboratory procedures and modeling efforts may reduce core damage effects. However, no simple procedure is currently available to eliminate the problem. The use of simplified laboratory test procedures, particularly the application of an inappropriate effective stress principle, may lead to erroneous interpretations. Introduction Time-lapse (4D) seismic provides a potentially powerful tool to identify changes in a reservoir induced during production. This is accomplished by running repeated seismic surveys throughout the production period and looking for changes in the seismic response. Such changes can, in principle, be ascribed to several parameters, the most obvious being fluid saturation, pore pressure, and temperature. 1,2 Thus, by monitoring the reservoir at various timesteps during an enhanced oil recovery operation such as a water injection, one may identify nonflooded compartments within the reservoir. This information permits subsequent positioning of new production and injection wells or modification of the existing depletion strategy in a way that significantly improves the total recovery of the reservoir. During the past 5 years or so, the number of commercial 4D seismic surveys has increased from fewer than 5 to approximately 25 per year. The cost of a reservoir monitoring project is in many places comparable to that of drilling a new well, and benefits have, in many cases, proven so large that most companies now consider it a natural part of reservoir management. There are, however, a number of factors that influence the success for such surveys, be they related to the reservoir itself in terms of depth, stress, temperature, and structural and compositional complexity, or to such intrinsic reservoir properties as the rock and fluid properties at the given reservoir conditions. The success also is affected by the quality of the seismic acquisition parameters during the surveys, such as the degree of repeatability between subsequent surveys,3 as well as the final processing of the seismic data (see Lumley et al.4 for a technical risk summary). Because of this substantial variability, one should always perform a seismic monitoring feasibility study in advance to quantify the extent to which expected production-induced changes may be detectable from a planned seismic monitoring study. Such a study needs integrated input from a number of disciplines; after a proper reservoir model is built, reservoir simulations must be undertaken to produce relevant scenarios to be expected throughout production. Thereafter, these must be translated into corresponding seismic parameters from rock physical principles before, finally, seismic modeling can be undertaken for various acquisition geometries and subsequent processing alternatives can be tested. Traditionally, seismic monitoring parameters have been deduced from post-stack data through changes in the vertical P-wave reflection coefficient, expressed by the corresponding acoustic impedance ZP = ?·VP, where VP = the acoustic P-wave velocity and p=the density. This, essentially, has allowed for inversion for only one effective reservoir parameter. Knowing that there may be concurrent changes in several parameters has made the interpretation of the seismics difficult. More recently, however, a practical use of amplitude-vs.-offset (AVO) data has been introduced5 that enables the determination of the corresponding shear-wave impedance ZS. This simultaneous determination of P- and S-wave impedances has allowed for distinction between changes in multiple reservoir properties such as saturation and pore pressure, assuming that other parameters remain constant. A crucial point in the initial feasibility study, as well as in the final interpretation of deduced changes in seismic parameters during monitoring, is the quantitative rock physical interpretation of the seismic parameters in terms of changes in reservoir parameters. A number of factors affect the acoustic velocities in a complicated manner, and no theory exists that can be applied generally. Therefore, laboratory testing on core material at representative test conditions is required as a natural part of a feasibility study to quantify the effects of pore pressure, saturation, and temperature that can be encountered during monitoring. The objective of this paper is to elucidate some fundamental questions related to these key issues. In particular, we focus on the neglected effect of core damage upon the laboratory-measured stress sensitivity of velocities6 and the importance of using proper stress conditions during such experiments. We handle this by performing systematic laboratory measurements on synthetic reservoir sandstones formed under stress, and we try to tune the properties of the synthetics to match specific reservoir sandstones. Even if this procedure is not fully representative of all reservoir sandstones, our experience is that it may at least be applicable for weakly cemented, clean sandstone reservoirs. Furthermore, we also illustrate pitfalls in the common use of the so-called effective stress principle. Fundamental Questions As in all core testing, one has to deal with two fundamental questions when running experiments to quantify effects of pore pressure, saturation, and temperature on acoustic velocities:Are the cores representative of the reservoir rock?Are the tests performed under the appropriate conditions for prediction of in-situ behavior? Core Representativity. The first question has two different aspects. First, the small core may not be representative of a large heterogeneous reservoir. The most obvious way to deal with this is to test many cores and then perform some kind of statistical analysis on the acquired data. Still, the reservoir may contain fractures and faults at subseismic length scales, which are not present in the core samples but contribute to seismic velocities. The second aspect to consider is core damage: a rock is "born" and "lives all its life" in a stressed earth. When drilled and brought to the surface, it meets the hostile world of atmospheric conditions. The stress release may be sufficient to induce microcracks or broken grain bonds in the rock core, leading to altered rock properties. The damage is permanent and has been shown to have strong effects on rock mechanical and acoustic parameters.7 In the present paper, we discuss in more detail how core damage affects the predicted stress sensitivity of the seismic velocity.
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Bao, Xin, Jingbo Liu, Dongyang Wang, Shutao Li, Fei Wang, and Xiaofeng Wang. "Modification Research of the Internal Substructure Method for Seismic Wave Input in Deep Underground Structure-Soil Systems." Shock and Vibration 2019 (August 19, 2019): 1–13. http://dx.doi.org/10.1155/2019/5926410.
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A new internal substructure method for seismic wave input in soil-structure systems was recently proposed. This method simplifies the calculation of equivalent input seismic loads and avoids the participation of artificial boundaries in the process of seismic wave input. However, in previous research and applications, the internal substructures are usually intercepted down from the free surface, which forms large substructures and increases the computational effort for data management on the substructure nodes, especially for deep underground structures. In this study, the internal substructure method is modified by intercepting the internal substructures entirely beneath the free surface and adjacently around the underground structures. Then, the equivalent input seismic loads are obtained through the dynamic analysis of the internal substructures and applied to the corresponding positions of the total soil-structure models. Thus, the earthquake energy can be more efficiently input into the region near the underground structures without losing computational accuracy. We provide the detailed implementation procedures of this modified method and validate its applicability and accuracy through the scattered problems of underground cavities in homogeneous and layered half-space sites.
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Uzdin, A. M., T. V. Ivanova, G. V. Sorokina, Hong Lin, Kh Kh Kurbanov, and Sh Sh Nazarova. "Setting the level of design inputs for the seismic stability structures." Journal of Physics: Conference Series 2388, no. 1 (December 1, 2022): 012080. http://dx.doi.org/10.1088/1742-6596/2388/1/012080.
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Abstract The paper deals with the task of setting the level of the design input for assessing the structure seismic resistance. An increase in the expected peak ground accelerations with the development of the earthquake engineering from 1 m/s2 to 7 m/s2 is noted. The absence of a correlation between the peak ground accelerations and the seismic action intensity, as well as the dependence of the peak ground accelerations on the action spectral composition, is explained. A method of determining the ground design acceleration using the standard seismic scale in force in Russia is shown. The illogicality of setting the design input according to of the Guidelines “Earthquake Engineering” in force in Russia is shown and ways of correcting the current situation are indicated. It is noted that to solve the problem of setting the design input, no seismic zoning maps are required. Information on seismic hazard can be represented by a single number characterizing the relationship between the intensity and repeatability of the action on the construction site. The relationship between the design accelerations stated in the «Earthquake Engineering» Guidelines and the peak ground accelerations in the «Seismic Intensity Scale» State Standard is explained. The approach described in the paper is the basis for input setting for performance-based designing.
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Yang, T. Y., Dimitrios Konstantinidis, and James M. Kelly. "The Influence of Isolator Hysteresis on Equipment Performance in Seismic Isolated Buildings." Earthquake Spectra 26, no. 1 (February 2010): 275–93. http://dx.doi.org/10.1193/1.3276901.
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The seismic isolation code which must be used for all seismic isolated buildings in the United States is conservative in many of its provisions. While seismic isolation is flourishing in other countries, it is underused in the United States. For static analysis and for the selection of time histories, the spectrum is constant-velocity for periods of one second and longer, leading to large displacements for long period systems and forcing the designer to use added damping to reduce these displacements. The damping systems used are hysteretic with the characteristic that damping decreases with increasing displacement. To achieve the damping needed to reduce these large displacements, expected from very rare seismic input, means that at smaller displacements, caused by realistic levels of seismic input, the damping will be very much higher, and there may be stiffening of the isolation system, meaning that the building may not act as isolated and there may be an impact on sensitive internal equipment. This paper shows how highly damped isolation systems are counterproductive to isolation and suggests an alternative approach that will conform to code requirements but ensure that, at moderate earthquake inputs, the equipment remains protected, and the large code-mandated displacements are kept to acceptable levels.
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Fujii, Kenji. "Bidirectional Seismic Energy Input to an Isotropic Nonlinear One-Mass Two-Degree-of-Freedom System." Buildings 11, no. 4 (April 1, 2021): 143. http://dx.doi.org/10.3390/buildings11040143.
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The test results obtained for reinforced concrete columns by several studies have revealed that the peak displacement and cumulative hysteresis energy are important parameters for evaluating the damage of columns under horizontal bidirectional and unidirectional loading. Therefore, the seismic parameters related to the nonlinear peak displacement and cumulative hysteresis energy with regard to horizontal bidirectional seismic input should be investigated. In this study, the bidirectional seismic input to an isotropic nonlinear one-mass two-degree-of-freedom system was evaluated. First, a dimensionless parameter γ, which controls the low-cycle fatigue effect, was formulated as a function of two energy input parameters (the maximum momentary input energy and total input energy) and a nonlinear system (ductility and normalized hysteresis energy absorption during a half cycle). Then, the maximum momentary input energy and total input energy were evaluated according to the ground motion characteristics (Fourier coefficient of horizontal ground motion components) and system properties. Finally, the nonlinear peak displacement and parameter γ of the nonlinear system were evaluated on the basis of the maximum momentary input energy and total input energy. The results revealed that the nonlinear peak displacement and parameter γ can be properly evaluated using two energy parameters.
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Stamatovska, G. "Seismic safety of structures — case study: Probabilistic methodological approach to definition of seismic input." Acta Geodaetica et Geophysica Hungarica 43, no. 2-3 (June 2008): 337–48. http://dx.doi.org/10.1556/ageod.43.2008.2-3.18.
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Lin, Sen, Zhi Cheng Lu, Zhu Bing Zhu, Po Gao, and Sheng Li. "Study of Shaking Table Test on Seismic Performance of 750 kV Post Insulator." Advanced Materials Research 1065-1069 (December 2014): 1491–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1491.
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The applicability of seismic waves for the seismic performance estimation of 750 kV post insulator has been investigated in full-scale shaking table test. the input seismic waves comprise El Centro seismic wave, Landers seismic wave, sine beat wave and artificial standard wave. The testing results indicate that, high dynamic responses of the equipment can be obtained under artificial standard wave condition. In addition, due to comprehensive enveloping ability and gentle spectral curve, artificial standard wave is ideal for the seismic performance evaluation of 750 kV post insulator in the test. An finite element model has been developed and numerical seismic analysis has been performed. Satisfactory match between the simulated and measured results reveals the reliability of the test. The achievements obtained in this paper are helpful in choosing reasonable input wave for shaking table test, and also provide technical support on determining seismic capacity of high voltage electrical equipment.
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Dai, Jian-Bo, Gui-Di Zhang, Cheng-Tao Hu, and Kai-Kai Cheng. "Study on Synthesis Method of Multipoint Seismic Waves for Buried Oil and Gas Pipeline in Shaking Table Tests." Shock and Vibration 2021 (July 31, 2021): 1–8. http://dx.doi.org/10.1155/2021/4624871.
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The buried oil and gas pipeline is a linear structure with infinite length. In the shaking table test of its seismic response, it is necessary to input the spatially related multipoint seismic wave considering the propagation characteristics of ground motion. The multipoint seismic excitation shaking table tests and loading scheme of buried oil and gas pipelines are designed and formulated. The synthesis method of spatial correlation multipoint seismic wave for the buried oil and gas pipeline test is proposed in this study. The values of relevant parameters are analyzed, and corresponding program is compiled by MATLAB. The results show that the developed multipoint excitation shaking table seismic wave input scheme is reasonable. At the same time, the synthesized multipoint seismic wave based on the actual seismic record and artificial random simulation seismic wave can meet the test requirements, which suggests the testing effect is good.
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Hampshire De C. Santos, Sergio, Luca Zanaica, Carmen Bucur, and Silvio De Souza Lima. "Comparative Study of Codes for Seismic Design of Structures." Mathematical Modelling in Civil Engineering 9, no. 1 (March 1, 2013): 1–12. http://dx.doi.org/10.2478/mmce-2013-0001.
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Abstract This paper presents a comparative evaluation among some international, European and American, seismic design standards. The study considers the criteria for the analysis of conventional (residential and commercial) buildings. The study is focused on some critical topics: definition of the recurrence periods for establishing the seismic input; definition of the seismic zonation and shape of the design response spectra; consideration of local soil conditions; definition of the seismic force-resisting systems and respective response modification coefficients; definition of the allowable procedures for the seismic analysis. A model for a standard reinforced concrete building (“Model Building”) has been developed to permit the comparison among codes. This building has been modelled with two different computer programs, SAP2000 and SOFiSTiK and subjected to seismic input according to the several seismic codes. The obtained results compared are leading to some important conclusions.
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Xu, Guo Lin, Ya Shuang Bai, and Wen Gang Chen. "The Influence of Seismic Motion Input Direction and Damping on the Dynamic Analysis of Mega Steel-Frame Structure." Advanced Materials Research 295-297 (July 2011): 236–39. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.236.
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A more accurate simulation of the response to the structure under seismic load action can be generated through taking bi-directional seismic motion input into consideration. The commonly used four calculation methods of bi-directional input are adopted in this paper to compare the different dynamic responses of mega steel-frame structure to seismic load action. The paper also provides a method for choosing Raleigh damping coefficients applicable to the dynamic analysis of mega steel-frame structure.
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Dmitrachkov, D. K., and M. I. Protasov. "Seismic inversion of depth migration results." Russian Journal of Geophysical Technologies, no. 4 (March 10, 2022): 4–15. http://dx.doi.org/10.18303/2619-1563-2021-4-4.
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Seismic inversion is used in practice as a tool for predicting reservoir properties. It allows one to extract a model with a high level of detail from seismic data, i.e., high-frequency component of the model. In this case, the input data are the time processing results, and the issues related to the low-frequency component of the model are not considered usually. In the presented work, a model-based seismic inversion algorithm is implemented. The input data for the inversion are the depth image results in true amplitudes and the depth migration velocity model. The possibilities of seismic inversion are numerically investigated to refine the low-frequency component of the model. Experiments were carried out using synthetic seismic data got for realistic Sigsbee model.