High Performance Computing for Fault Displacement Simulation

Sawada, Masataka; Haba, Kazumoto; Hori, Muneo

doi:10.2208/jscejam.73.i_699

Cited by 5 publications

(5 citation statements)

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“…If we consider the Lagrangian for a body containing a discontinuity plane, then the rigorous formation of nonlinear joint elements is straightforward. 19 This formulation is more concise than that proposed by Bfer. 20 Having developed a rigorous formulation for a nonlinear joint element, we examined its convergence with respect to mesh sizes of 10 m, 5 m, 2.5 m, 2 m, and 1 m, with Figure 7A-B showing the numerical analysis model for the 10-m mesh.…”

Section: Nonlinear Joint Elementmentioning

confidence: 91%

“…This formulation is an approximate treatment because it does not consider the distributions of displacement and traction on the plane. If we consider the Lagrangian for a body containing a discontinuity plane, then the rigorous formation of nonlinear joint elements is straightforward 19 . This formulation is more concise than that proposed by Bfer 20 …”

Section: Implementation Of Tensorial Materials Propertiesmentioning

confidence: 99%

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Development of a general‐purpose parallel finite element method for analyzing earthquake engineering problems

Motoyama

Sawada

Hotta

et al. 2021

Earthq Engng Struct Dyn

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A parallel finite element method (FEM) based on high-fidelity models for solving diverse earthquake engineering problems is presented. Its key feature is a parallel solver that is tuned to solve large-scale wave equations. Tensorial material constitutive relations of concrete and soil and sophisticated nonlinear joint elements are implemented to broaden the applicability of the parallel FEM. The performance of the proposed parallel FEM is demonstrated for three examples; namely, seismic response, liquefaction, and surface earthquake fault analyses. A high-fidelity model was constructed for each analysis, and the numerical results were validated against observed data. The performance of the proposed parallel FEM approach was evaluated in terms of the resolution of the simulated results.Ensemble computing based on approximately a hundred high-fidelity models is useful for cases where there are considerable uncertainties regarding the material properties.

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Section: Nonlinear Joint Elementmentioning

confidence: 91%

Section: Implementation Of Tensorial Materials Propertiesmentioning

confidence: 99%

Development of a general‐purpose parallel finite element method for analyzing earthquake engineering problems

Motoyama

Sawada

Hotta

et al. 2021

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Joint elements for fault displacement simulations should be defined to ensure proper convergence for the chosen element sizes and applicability to curved faults. We developed a rigorous joint element in which element stiffness matrices are derived from the Lagrangian on a discontinuous surface using an isoparametric formulation [12]. The following is a formulation for a second-order triangular joint element.…”

Section: Fem For the Fault Displacement Problemmentioning

confidence: 99%

“…We implemented joint elements using a nonlinear spring-type constitutive equation to represent fault movement [12,13]. The constitutive equation for the shear movement of the joint element is defined as follows (see Figure 4):…”

Section: Fem For the Fault Displacement Problemmentioning

confidence: 99%

“…We developed an FEM strengthened with the following two functions: (1) a symplectic time integration explicit scheme to conserve the energy of the system and (2) rigorously formulated high-order joint elements. The FEM was also enhanced with parallel computing capabilities [12,13]. Another use of HPC is to perform multi-case analyses with different input conditions in parallel.…”

Section: Introductionmentioning

confidence: 99%

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Predictive Simulation for Surface Fault Occurrence Using High-Performance Computing

2022

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Numerical simulations based on continuum mechanics are promising methods for the estimation of surface fault displacements. We developed a parallel finite element method program to perform such simulations and applied the program to reproduce the 2016 Kumamoto earthquake, where surface rupture was observed. We constructed an analysis model of the 5 × 5 × 1 km domain, including primary and secondary faults, and inputted the slip distribution of the primary fault, which was obtained through inversion analysis and the elastic theory of dislocation. The simulated slips on the surface were in good agreement with the observations. We then conducted a predictive simulation by inputting the slip distributions of the primary fault, which were determined using a strong ground motion prediction method for an earthquake with a specified source fault. In this simulation, no surface slip was induced in the sub-faults. A large surface slip area must be established near a sub-fault to induce the occurrence of a slip on the surface.

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Estimation of Surface Fault Displacement by High Performance Computing

Sawada

Haba

Hori

2018

J. Earthquake and Tsunami

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Reliable estimation of surface fault displacements is crucial to the safety of nuclear power plant facilities. It is necessary to develop a numerical method for the estimation. In the study, we develop a finite element method in which the following two functions are implemented: (1) a symplectic time integration of an explicit scheme to properly conserve the energy of the system; and (2) rigorously formulated joint elements of high order. The finite element method is enhanced with parallel computing capability. We apply the developed method to solve simple three-dimensional models of faults embedded in a rock mass. It includes a comparison of results from quasi-static and dynamic simulations and investigation of the sensitivity of results to the shear stiffness on faults. In the study, we propose capacity computing with a quasi-static simulation for uncertainty quantification.

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High Performance Computing for Fault Displacement Simulation

Cited by 5 publications

References 0 publications

Development of a general‐purpose parallel finite element method for analyzing earthquake engineering problems

Development of a general‐purpose parallel finite element method for analyzing earthquake engineering problems

Predictive Simulation for Surface Fault Occurrence Using High-Performance Computing

Estimation of Surface Fault Displacement by High Performance Computing

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