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Author : Liangcai He
Publisher :
ISBN 13 :
Total Pages : 418 pages
Book Rating : 4.:/5 (318 download)
Download or read book Parallel Finite Element Modeling of Earthquake Liquefaction Response written by Liangcai He and published by . This book was released on 2006 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jinchi Lu
Publisher :
ISBN 13 :
Total Pages : 359 pages
Book Rating : 4.:/5 (76 download)
Download or read book Parallel Finite Element Modeling of Earthquake Ground Response and Liquefaction written by Jinchi Lu and published by . This book was released on 2006 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parallel computing is gradually becoming a main stream tool in geotechnical simulations. The need for high fidelity and for modeling of fairly large 3-dimensional (3D) spatial configurations is motivating this direction of research. The main objective of this thesis is to develop a state-of-the-art nonlinear parallel finite element program for earthquake ground/structure response and liquefaction simulation. In the developed parallel code, ParCYCLIC, finite elements are employed within an incremental plasticity, coupled solid-fluid formulation. A constitutive model calibrated by physical tests represents the salient characteristics of sand liquefaction and associated accumulation of shear deformations. Key elements of the computational strategy employed in ParCYCLIC include the development of a parallel sparse direct solver, the deployment of an automatic domain decomposer, and the use of the Multilevel Nested Dissection algorithm for ordering of the finite element nodes. Conducted large-scale geotechnical simulations show that ParCYCLIC is efficiently scalable to a large number of processors. Calibrated FE simulations are increasingly providing a reliable environment for modeling liquefaction-induced ground deformation. Effects on foundations and super-structures may be assessed, and associated remediation techniques may be explored, within a unified framework. Current capabilities of such a FE framework are demonstrated via a series of 3-dimensional (3D) simulations. High-fidelity 3D numerical studies using ParCYCLIC are shown to provide more accurate results. Much time and effort is expended today in building an appropriate finite element mesh and associated data files. User-friendly interfaces can significantly alleviate this problem allowing for high efficiency and much increased confidence. Pre- and post processing interfaces are developed to facilitate use of otherwise computational environments with numerous (often vaguely defined) input parameters. User-friendly interfaces are useful not only for simple model simulations on single-processor computers but also for large-scale modeling on a parallel machine.
Author : Zhaohui Yang
Publisher :
ISBN 13 :
Total Pages : 286 pages
Book Rating : 4.:/5 (318 download)
Download or read book Numerical Modeling of Earthquake Site Response Including Dilation and Liquefaction written by Zhaohui Yang and published by . This book was released on 2000 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. H. Barbat
Publisher :
ISBN 13 :
Total Pages : 622 pages
Book Rating : 4.3/5 (91 download)
Download or read book Structural Response Computations in Earthquake Engineering written by A. H. Barbat and published by . This book was released on 1989 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Terje Haukaas
Publisher :
ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (321 download)
Download or read book Finite Element Reliability and Sensitivity Methods for Performance-based Earthquake Engineering written by Terje Haukaas and published by . This book was released on 2004 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work in this report is motivated by the performance-based engineering approach advocated by PEER. A comprehensive, object-oriented software framework for finite element sensitivity and reliability analysis is developed. The work builds on the existing software OpenSees. The software framework is used to investigate and address challenges particular to nonlinear finite element reliability analysis. As a result, smoothed material models, modifications in existing search algorithms, and a search algorithm hitherto not used in reliability analysis are developed.
Author : M. Hori
Publisher : CRC Press
ISBN 13 : 1000615774
Total Pages : 192 pages
Book Rating : 4.0/5 (6 download)
Download or read book Integrated Earthquake Simulation written by M. Hori and published by CRC Press. This book was released on 2022-09-26 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated earthquake simulation (IES) is a new method for evaluating earthquake hazards and disasters induced in cities and urban areas. It utilises a sequence of numerical simulations of such aspects as earthquake wave propagation, ground motion amplification, structural seismic response, and mass evacuation. This book covers the basics of numerical analysis methods of solving wave equations, analyzing structural responses, and developing agent models for mass evaluation, which are implemented in IES. IES makes use of Monte-Carlo simulation, which takes account of the effects of uncertainties related to earthquake scenarios and the modeling of structures both above and below ground, and facilitates a better estimate of overall earthquake and disaster hazard. It also presents the recent achievement of enhancing IES with high-performance computing capability that can make use of automated models which employ various numerical analysis methods. Detailed examples of IES for the Tokyo Metropolis Earthquake and the Nankai Trough Earthquake are given, which use large scale analysis models of actual cities and urban areas.
Author : Juan M. Pestana
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.F/5 ( download)
Download or read book FEQDrain written by Juan M. Pestana and published by . This book was released on 1997 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rui Wang
Publisher : Springer
ISBN 13 : 3662496631
Total Pages : 131 pages
Book Rating : 4.6/5 (624 download)
Download or read book Single Piles in Liquefiable Ground written by Rui Wang and published by Springer. This book was released on 2016-03-17 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the seismic response of piles in liquefiable ground. It describes the design of a three-dimensional, unified plasticity model for large post-liquefaction shear deformation of sand, formulated and implemented for parallel computing. It also presents a three-dimensional, dynamic finite element analysis method for piles in liquefiable ground, developed on the basis of this model,. Employing a combination of case analysis, centrifuge shaking table experiments and numerical simulations using the proposed methods, it demonstrates the seismic response patterns of single piles in liquefiable ground. These include basic force-resistance mode, kinematic and inertial interaction coupling mechanism and major influence factors. It also discusses a beam on the nonlinear Winkler foundation (BNWF) solution and a modified neutral plane solution developed and validated using centrifuge experiments for piles in consolidating and reconsolidating ground. Lastly, it studies axial pile force and settlement during post-earthquake reconsolidation, showing pile axial force to be irrelevant in the reconsolidation process, while settlement is process dependent.
Author : Wen-Gen Liao
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.F/5 ( download)
Download or read book The Behavior of Submerged, Multiple Bodies in Earthquakes written by Wen-Gen Liao and published by . This book was released on 1982 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yuan Feng
Publisher :
ISBN 13 : 9780438930803
Total Pages : pages
Book Rating : 4.9/5 (38 download)
Download or read book High-fidelity Inelastic Finite Element Analysis on Parallel Computers written by Yuan Feng and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented is the development of high-fidelity elastoplastic finite element simulation for earthquake soil-structure interaction problems. Part I presents the modeling and simulation systems for earthquake soil-structure interaction problems, Part II presents the high-fidelity modeling aspects of the systems, and Part III presents the high-performance aspects of the systems. Part I presents the modeling and simulation systems for earthquake soil-structure interaction (ESSI ) problems. The simulation system was named ESSI, which shares the same name with the target problem. The ESSI simulation system is based on the finite element analysis (FEA). Three features are presented as follows: (i) A domain-specific language (DSL) was extended in ESSI to facilitate the modeling of FEA. (ii) To reduce the simulation domain in an earthquake, a new interface of seismic input using wave deconvolution and domain reduction method is developed. (iii) To improve the availability of ESSI system, a remote desktop containing ESSI systems, preprocess and postprocess utilities is deployed on the cloud computing platform. The performance and cost of ESSI cloud computing services are discussed.Part II focuses on high-fidelity elastoplastic material modeling in ESSI system. To improve the earthquake-resistant design, the realistic modeling of soil stress-strain behavior plays a crucial role in the elastoplastic finite element analysis. Three features about the elastoplastic material modeling are presented as follows: (i) To simulate the realistic shear behavior unload cyclic loading, multi-surface plastic model is implemented to match the shear modulus reduction and damping properties. (ii) To represent the micro-structure of soil materials, the three-dimensional finite element formula of Cosserat elastoplasticity are developed and implemented. With the additional couple stress, researchers are able to control the free rotations on particles. The Cosserat elastoplastic models achieve mesh-independent plastic zones in the localization problems. (iii) To build trust in the developed elastoplastic materials, the constitutive algorithms are verified using prescribed solution forcing, Richardson extrapolation, and grid convergence index.Part III focuses on high-performance aspects of ESSI system, including coarse-grain parallelism and fine-grain parallelism. In coarse-grain parallelism, hardware-aware plastic domain decomposition (HAPDD) algorithm is developed for load balancing. Elastoplastic finite element simulation has two computation phases: solving elastoplastic material at Gauss points and solving systems of equations of all elements. HAPDD aims to balance the computation load of solving elastoplastic material. Metis/ParMetis and Scotch/PtScotch are used to adaptively repartition the computation graph. A parametric study is conducted to tune the partitioning kernel for the specific application code in earthquake soil-structure interaction. In fine-grain parallelism, a small tensor library is developed to accelerate the elastoplastic algorithms. While the conventional linear algebra optimizes the large-scale matrix operations, however, in elastoplastic algorithms, millions of small tensor algebra dominates the computation time. Explicit SIMD intrinsic functions are used to improve the tensor algebra performance.Based on the three parts above, the ESSI system was significantly improved in thisresearch in terms of simulation features and performance.
Author : Yan-Hong Chen
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (227 download)
Download or read book Transient finite element analysis of the response of dams to earthquakes written by Yan-Hong Chen and published by . This book was released on 1990 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michele Barbato
Publisher :
ISBN 13 :
Total Pages : 590 pages
Book Rating : 4.:/5 (182 download)
Download or read book Finite Element Response Sensitivity, Probabilistic Response and Reliability Analyses of Structural Systems with Applications to Earthquake Engineering written by Michele Barbato and published by . This book was released on 2007 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: The geometric, mechanical, material and loading parameters used to define the mechanics-based finite element (FE) models of structural systems as well as their seismic input are characterized by significant uncertainties. The rational treatment of uncertainties in computational mechanics has been the object of increasing attention in recent years. Modern design codes indirectly account for parameter and model uncertainties in order to ensure satisfactory designs. Thus, in addition to accurate deterministic models, methods are needed to propagate uncertainties from the parameters defining the FE model of a structure to the engineering demand parameters. FE response sensitivities (RSs) to both model and loading parameters represent an essential ingredient in studying this complex uncertainty propagation. New RS algorithms based on the Direct Differentiation Method (DDM) are derived and implemented in general-purpose nonlinear structural analysis frameworks. The use of the DDM is extended to (1) force-based frame elements, (2) steel-concrete composite structures, and (3) three-field mixed FEs. In addition, the effects on RS continuity of using smooth versus non-smooth material constitutive models are thoroughly examined. An efficient simulation technique for an existing fully non-stationary stochastic earthquake ground motion model is developed. The definition of non-geometric spectral characteristics is extended to general complex-valued non-stationary stochastic processes. Closed-form approximate solutions of the first-passage problem are developed for single- and multi-degree-of-freedom linear elastic systems. First-order second-moment approximations of the first- and second-order statistics of the response of linear/nonlinear structural systems with random/uncertain parameters and subjected to quasi-static and/or dynamic load(s) are computed efficiently using DDM-based FE RSs. The probability of a structural response quantity exceeding a specified threshold level is obtained by using the First-Order Reliability Method in conjunction with the DDM-based FE RSs in the search for the Design Point(s) (DP). A new method, referred to as Multidimensional Visualization in the Principal Planes, is developed to explore the geometry of limit-state surfaces near the DP(s) in reduced-spaces defined by planes of major principal curvatures at the DP. A new hybrid reliability analysis method (DP search - Response Surface - Importance Sampling) is developed and tested. Based on pushover and time history analyses, examples of both time-invariant and time-variant reliability analysis of structural systems are presented to illustrate the probabilistic methods developed.
Author : Masao Hayashi
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (254 download)
Download or read book Three dimensional earthquake response analysis of the continuum by the finite element method written by Masao Hayashi and published by . This book was released on 1971 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Long Chen
Publisher :
ISBN 13 :
Total Pages : 457 pages
Book Rating : 4.:/5 (126 download)
Download or read book Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications written by Long Chen and published by . This book was released on 2020 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: Human and economic losses caused by earthquake-induced soil liquefaction underscore the importance of assessing liquefaction hazards, both by determining whether a soil is likely to liquefy and by estimating consequences that these events may cause. Numerical simulations have proven to be useful for these purposes. Reliable numerical analysis requires constitutive models to represent the in-situ soil behavior as well as general loading and drainage conditions. In this context, the main objective of this research is to implement, verify, and validate two newly developed constitutive models, PM4Sand and PM4Silt (Boulanger and Ziotopoulou, 2017, 2018), in the finite element platform OpenSees (OpenSees, 2007). These models are developed for earthquake engineering applications and can achieve reasonable approximations of desired behavior including pore pressure generation and dissipation, limiting strains, and cyclic mobility with straightforward calibration process. The verification study compares the response of the same model implemented in three different frameworks, OpenSees, FLAC, and PLAXIS, using stress point, element model, and 1D analyses. The validation study demonstrates the models0́9 capability in capturing realistic soil behavior under different scenarios including case-histories and a large-scale shake table test. For further validation of PM4Sand, the second part of this dissertation concentrates on the contribution of the UW numerical simulation team to three recent LEAP workshops that have focused on validating constitutive models using high quality laboratory and centrifuge experiments. The simulated models include a constant slope subject to lateral spreading and a sheet pile retaining structure supporting liquefiable soils. Lastly, this dissertation addresses two case studies using PM4Sand and PM4Silt to shed light on their application for analyzing lateral spreading induced by liquefaction. The first case focuses on a typical highway bridge embankment and investigates the efficiency of different intensity measures for estimating lateral displacement. The second case focuses on a real case study that showed zero-displacement lateral spreading during a recent earthquake event due, possibly, to interbedded sand, silt, and clay deposits.
Author : Charles Richard Noble
Publisher :
ISBN 13 :
Total Pages : 508 pages
Book Rating : 4.:/5 (76 download)
Download or read book Finite Element Techniques for Realistically Simulating the Seismic Response of Concrete Dams written by Charles Richard Noble and published by . This book was released on 2007 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tetsuo Tobita
Publisher :
ISBN 13 :
Total Pages : 358 pages
Book Rating : 4.:/5 (54 download)
Download or read book Energy-based Modeling of Liquefaction and Earthquake Site Response written by Tetsuo Tobita and published by . This book was released on 2002 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nima Tafazzoli
Publisher :
ISBN 13 : 9781267663160
Total Pages : pages
Book Rating : 4.6/5 (631 download)
Download or read book Methods, Computational Platform, Verification, and Application of Earthquake-soil-structure-interaction Modeling and Simulation written by Nima Tafazzoli and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic response of soil-structure systems has attracted significant attention for a long time. This is quite understandable with the size and the complexity of soil-structure systems. The focus of three important aspects of ESSI modeling could be on consistent following of input seismic energy and a number of energy dissipation mechanisms within the system, numerical techniquesused to simulate dynamics of ESSI, and influence of uncertainty of ESSI simulations. This dissertation is a contribution to development of one such tool called ESSI Simulator. The work is being done on extensive verified and validated suite for EESI Simulator. Verification and validation are important for high fidelity numerical predictions of behavior of complex systems. This simulator uses finite element method as a numerical tool to obtain solutions for large class of engineering problems such as liquefaction, earthquake-soil-structure-interaction, site effect, piles, pile group, probabilistic plasticity, stochastic elastic-plastic FEM, and detailed large scale parallel models. Response of full three-dimensional soil-structure-interaction simulation of complex structures is evaluated under the 3D wave propagation. Domain-Reduction-Method is used for applying the forces as a two-step procedure for dynamic analysis with the goal of reducing the large size computational domain. The issue of damping of the waves at the boundary of the finite element models is studied using different damping patterns. This is used at the layer of elements outside of the Domain-Reduction-Method zone in order to absorb the residual waves coming out of the boundary layer due to structural excitation. Extensive parametric study is done on dynamic soil-structure-interaction of a complex system and results of different cases in terms of soil strength and foundation embedment are compared. High efficiency set of constitutive models in terms of computational time are developed and implemented in ESSI Simulator. Efficiency is done based on simplifying the elastic-plastic stiffness tensor of the constitutive models. Almost in all the soil-structure systems, there are interface zones in contact with each other. These zones can get detached during the loading or can slip on each other. In this dissertation the frictional contact element is implemented in ESSI Simulator. Extended verification has been done on the implemented element. The interest here is the effect of slipping and gap opening at the interface of soil and concrete foundation on the soil-structure system behavior. In fact transferring the loads to structure is defined based on the contact areas which will affect the response of the system. The effect of gap openings and sliding at the interfaces are shown through application examples. In addition, dissipation of the seismic energy due to frictional sliding of the interface zones are studied. Application Programming Interface (API) and Domain Specific Language (DSL) are being developed to increase developer's and user's modeling and simulation capabilities. API describes software services developed by developers that are used by users. A domain-specific language (DSL) is a small language which usually focuses on a particular problem domain in software. In general DSL programs are translated to a common function or library which can be viewed as a tool to hide the details of the programming, and make it easier for the user to deal with the commands.
