Large Scale Numerical Analysis Of Three Dimensional Seismic Waves
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Large Scale Numerical Analysis Of Three Dimensional Seismic Waves
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Author : G. L. Wojcik
language : en
Publisher:
Release Date : 1984
Large Scale Numerical Analysis Of Three Dimensional Seismic Waves written by G. L. Wojcik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
This report concludes our study of large-scale vectorized numerical analysis applied to time domain seismic wave phenomena in filled basins. Applications include calculations of waves from simple surface or buried sources in a variety of idealized 2-D Basin and Range models (36,000 to 120,000 nodes) described in an interim report, and one large 3-D model (400,000 nodes) from Yucca Flat, Nevada Test Site, described here. Analysis is based on an explicit, finite element, elastic wave solver designed for vectorized execution on the CRAY-1. The primary result of the present 3-D study is that, given the database available from investigations in Yucca Flat, Nevada Test Site, the size of feasible 3-D computational models on the CRAY-1S is adequate to simulate elastic wave fields and interpret arrivals for comparison with existing 3-D ground motion data. Synthetic seismograms from a 400,000 element 3-D simulation of the COALORA event a Yucca Flat indicate that a significant source of transverse motion on radial lines through the source is diffraction from a discontinuity in the Rainier Mesa tuff layer across the Yucca fault. Successful time-domain simulations in 3-D are feasible with pipelined supercomputers but optimal processing requires careful tailoring of the algorithm to vectorize inner code loops and eliminate nonessential arithmetic.
Three Dimensional Nonlinear Seismic Response Of Large Scale Ground Structure Systems
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Author : Kyung Tae Kim
language : en
Publisher:
Release Date : 2014
Three Dimensional Nonlinear Seismic Response Of Large Scale Ground Structure Systems written by Kyung Tae Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Effort is geared towards development of large-scale nonlinear ground-structure seismic response simulations. Mechanisms to allow for modeling of transmitting boundaries are incorporated, mainly relying on the Domain Reduction Method (DRM) approach. Parallel computing is employed to permit the execution of these large-scale simulations. A range of geometric configurations are addressed in order to explore various aspects of the involved seismic response characteristics. The OpenSees computational platform is employed throughout. To accommodate nonlinear response and soil/structure element stiffness considerations, an implicit time integration scheme is adopted. This scheme poses severe limitations on the number of parallel computing processors that can be used with reasonable efficiency (due to the required taxing communications between the different processors). Within the available constraints on time and computing resources, and the necessary additional OpenSees parallel-implementation machine-specific adaptions, the conducted DRM investigations mostly employed a soil domain 3D 8-node brick element of a 20 m side length (with about 150,000 such elements in the mesh). Consequently, severe limitations are imposed on the frequency content of the propagated seismic waves and the resulting system response. Future extensions in this direction of research can build solidly on the developments in this report and provide more accurate higher frequency system response. Significant attention is given to the simulation of a large-scale highway interchange system under seismic loading. A three-dimensional (3D) Finite Element model of an existing bridge interchange at the intersection of Interstates 10 and 215 (San Bernardino, CA) is developed. This interchange consists of three connectors at different bridge superstructure elevations. Initial focus is placed on modeling the three bridges, evaluation of vibration properties, and validation of one of the bridge models (North-West connector, NW) based on available earlier recorded earthquake response. A strategy to incorporate the above bridge structural models into a bridge-foundation-ground system (BFGS) is implemented based on the Domain Reduction Method (DRM) as developed by Bielak and his co-workers. A numerical implementation of this DRM by Petropolous and Fenves is employed and adapted as the soil domain. In this implementation, seismic waves are propagated from a realistic fault rupture scenario in southern California. As such, the BFGS can include the three-bridge interchange subjected to a 3D seismic excitation scenario. Within this numerical analysis framework, the effect of foundation soils of different stiffness and strength are investigated. The results are compared to the more conventional bridge model response under uniform as well as multi-support base excitation. In addition to this DRM-based implementation, a nonlinear ground-bridge model based on the actual local soil conditions at the interchange is investigated (with the NW only as the super-structure). Efforts include implementation and validation of a classical transmitting boundary at the base of the soil domain. Using this formulation, the BFGS response is compared and validated with earthquake recorded response at the bridge and local site. Under a potential site specific strong ground motion, computed force demands from the employed linear column models are compared to the strength as defined by a representative nonlinear column formulation. Finally, the seismic response of a large rigid structure with different embedment depths is assessed. Dynamic interaction between the structure and the surrounding soil is studied based on changes in soil elastic properties, depth of embedment, and characteristics of input excitation.
Three Dimensional Space Time Analysis Theory Of Geotechnical Seismic Engineering
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Author : Changwei Yang
language : en
Publisher: Springer Nature
Release Date : 2019-11-30
Three Dimensional Space Time Analysis Theory Of Geotechnical Seismic Engineering written by Changwei Yang and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-11-30 with Science categories.
Written by respected experts, this book presents essential findings on the Wenchuan earthquake. It establishes a series of time–frequency analysis methods, and subsequently applies them to the layered site, slope, and earth-retaining wall. Further, it examines various cases and their solutions, and shares the results of numerous shaking-table tests and numerical simulations. As such, it is a valuable resource for researchers and engineers in the fields of geotechnical engineering and anti-seismic engineering.
Afosr Technical Report Summaries
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Author :
language : en
Publisher:
Release Date : 1984
Afosr Technical Report Summaries written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Science categories.
Scattering Of Seismic Waves
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Author : E. Reinoso
language : en
Publisher: Computational Mechanics
Release Date : 2002
Scattering Of Seismic Waves written by E. Reinoso and has been published by Computational Mechanics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Mathematics categories.
This title deals with the application of boundary element technology to the study of scattering of seismic waves from irregular topographies and buried valleys. The author presents numerical refinements that allow the practical computation of two- and three-dimensional problems and then proves that these are accurate and efficient when compared with presently available solutions. The refinements are then applied to reproduce amplifications observed in the Mexico City Valley.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
The Shock And Vibration Digest
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Author :
language : en
Publisher:
Release Date : 1985
The Shock And Vibration Digest written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Shock (Mechanics) categories.
Full 3d Seismic Waveform Inversion
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Author : Po Chen
language : en
Publisher: Springer
Release Date : 2015-09-10
Full 3d Seismic Waveform Inversion written by Po Chen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-10 with Science categories.
This book introduces a methodology for solving the seismic inverse problem using purely numerical solutions built on 3D wave equations and which is free of the approximations or simplifications that are common in classical seismic inversion methodologies and therefore applicable to arbitrary 3D geological media and seismic source models. Source codes provided allow readers to experiment with the calculations demonstrated and also explore their own applications.
Elements Of 3d Seismology Third Edition
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Author : Christopher L. Liner
language : en
Publisher: SEG Books
Release Date : 2016-10-15
Elements Of 3d Seismology Third Edition written by Christopher L. Liner and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-15 with Science categories.
Elements of 3D Seismology, third edition is a thorough introduction to the acquisition, processing, and interpretation of 3D seismic data. This third edition is a major update of the second edition. Sections dealing with interpretation have been greatly revised in accordance with improved understanding and availability of data and software. Practice exercises have been added, as well as a 3D seismic survey predesign exercise. Discussions include: conceptual and historical foundations of modern reflection seismology; an overview of seismic wave phenomena in acoustic, elastic, and porous media; acquisition principles for land and marine seismic surveys; methods used to create 2D and 3D seismic images from field data; concepts of dip moveout, prestack migration, and depth migration; concepts and limitations of 3D seismic interpretation for structure, stratigraphy, and rock property estimation; and the interpretation role of attributes, impedance estimation, and AVO. This book is intended as a general text on reflection seismology, including wave propagation, data acquisition, processing, and interpretation and will be of interest to entry-level geophysicists, experts in related fields (geology, petroleum engineering), and experienced geophysicists in one subfield wishing to learn about another (e.g., interpreters wanting to learn about seismic waves or data acquisition).
Seismic Modeling And Imaging With The Complete Wave Equation
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Author : Ralph Phillip Bording
language : en
Publisher: SEG Books
Release Date : 1997
Seismic Modeling And Imaging With The Complete Wave Equation written by Ralph Phillip Bording and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Science categories.
Seismic modelling and imaging of the earth's subsurface are complex and difficult computational tasks. The authors of this volume present general numerical methods based on the complete wave equation for solving these important seismic exploration problems.