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Author: Jinchi Lu Publisher: ISBN: Category : Languages : en Pages : 359
Book Description
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: Jinchi Lu Publisher: ISBN: Category : Languages : en Pages : 359
Book Description
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: Rui Wang Publisher: Springer ISBN: 3662496631 Category : Science Languages : en Pages : 131
Book Description
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: Nima Tafazzoli Publisher: ISBN: 9781267663160 Category : Languages : en Pages :
Book Description
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.
Author: M. Hori Publisher: CRC Press ISBN: 1000615774 Category : Technology & Engineering Languages : en Pages : 192
Book Description
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: Muneo Hori Publisher: Imperial College Press ISBN: 1860946208 Category : Science Languages : en Pages : 344
Book Description
This book introduces new research topics in earthquake engineering through the application of computational mechanics and computer science. The topics covered discuss the evaluation of earthquake hazards such as strong ground motion and faulting through applying advanced numerical analysis methods, useful for estimating earthquake disasters. These methods, based on recent progress in solid continuum mechanics and computational mechanics, are summarized comprehensively for graduate students and researchers in earthquake engineering. The coverage includes stochastic modeling as well as several advanced computational earthquake engineering topics. Contents: Preliminaries: Solid Continuum Mechanics; Finite Element Method; Stochastic Modeling; Strong Ground Motion: The Wave Equation for Solids; Analysis of Strong Ground Motion; Simulation of Strong Ground Motion; Faulting: Elasto-Plasticity and Fracture Mechanics; Analysis of Faulting; Simulation of Faulting; BEM Simulation of Faulting; Advanced Topics: Integrated Earthquake Simulation; Unified Visualization of Earthquake Simulation; Standardization of Earthquake Resistant Design; Appendices: Earthquake Mechanisms; Analytical Mechanics; Numerical Techniques of Solving Wave Equation; Unified Modeling Language. Key Features Includes a detailed treatment of modeling of uncertain ground structures, such as stochastic modeling Explains several key numerical algorithms and techniques for solving large-scale, non-linear and dynamic problems Presents applications of methods for simulating actual strong ground motion and faulting Readership: Graduate students and researchers in earthquake engineering; researchers in computational mechanics and computer science.
Author: A. S. Cakmak Publisher: Elsevier Science & Technology ISBN: Category : Buildings Languages : en Pages : 970
Book Description
Ideas in soil dynamics and earthquake engineering theory and practice. The text covers the excitation and propagation of dynamic waves in the ground, the determination of dynamic properties of soils and rock and the behaviour of structures under dynamic loads.
Author: Hong Hao Publisher: CRC Press ISBN: 1351850202 Category : Science Languages : en Pages : 1935
Book Description
Mechanics of Structures and Materials: Advancements and Challenges is a collection of peer-reviewed papers presented at the 24th Australasian Conference on the Mechanics of Structures and Materials (ACMSM24, Curtin University, Perth, Western Australia, 6-9 December 2016). The contributions from academics, researchers and practising engineers from Australasian, Asia-pacific region and around the world, cover a wide range of topics, including: • Structural mechanics • Computational mechanics • Reinforced and prestressed concrete structures • Steel structures • Composite structures • Civil engineering materials • Fire engineering • Coastal and offshore structures • Dynamic analysis of structures • Structural health monitoring and damage identification • Structural reliability analysis and design • Structural optimization • Fracture and damage mechanics • Soil mechanics and foundation engineering • Pavement materials and technology • Shock and impact loading • Earthquake loading • Traffic and other man-made loadings • Wave and wind loading • Thermal effects • Design codes Mechanics of Structures and Materials: Advancements and Challenges will be of interest to academics and professionals involved in Structural Engineering and Materials Science.
Author: A. S. Cakmak Publisher: Elsevier Publishing Company ISBN: Category : Technology & Engineering Languages : en Pages : 396
Book Description
Despite advances in the field of geotechnical earthquake engineering, earthquakes continue to cause loss of life and property in one part of the world or another. The Third International Conference on Soil Dynamics and Earthquake Engineering, Princeton University, Princeton, New Jersey, USA, 22nd to 24th June 1987, provided an opportunity for participants from all over the world to share their expertise to enhance the role of mechanics and other disciplines as they relate to earthquake engineering. The edited proceedings of the conference are published in four volumes. This volume covers: Constitutive Relations in Soil Dynamics, Liquefaction of Soils, and Experimental Soil Dynamics. With its companion volumes, it is hoped that it will contribute to the further development of techniques, methods and innovative approaches in soil dynamics and earthquake engineering.
Author: Jinchi Lu
Author: Jinchi Lu
Author: Liangcai He
Author: Rui Wang
Author: Zhaohui Yang
Author: Nima Tafazzoli
Author: M. Hori
Author: Muneo Hori
Author: A. S. Cakmak
Author: Hong Hao
Author: A. S. Cakmak