Abstract
For more reliable evaluation of liquefaction, an analysis model of higher fidelity should be used even though it requires more numerical computation. We developed a parallel finite element method (FEM), implemented with the non-linear multiple shear mechanism model. A bottleneck experienced when implementing the model is the use of vast amounts of CPU memory for material state parameters. We succeeded in drastically reducing the computation requirements of the model by suitably approximating the formulation of the model. An analysis model of high fidelity was constructed for a soil-structure system, and the model was analyzed by using the developed parallel FEM on a parallel computer. The amount of required CPU memory was reduced. The computation time was reduced as well, and the practical applicability of the developed parallel FEM is demonstrated.
Highlights
After the accident at the Fukushima Daiichi Nuclear Power station, Japanese electric companies are required to reexamine the seismic safety of existing nuclear power plants in order to continue operation
When a strong ground motion acts on the foundation of a nuclear power plant, soil near the surface behaves in a nonlinear manner, which may result in liquefaction
The finite element method (FEM) is a common tool for seismic design, which is especially used for important structures, such as nuclear power plants, that require superior seismic resistance
Summary
After the accident at the Fukushima Daiichi Nuclear Power station, Japanese electric companies are required to reexamine the seismic safety of existing nuclear power plants in order to continue operation. Effects of soil non-linearity on seismic responses must be more accurately computed when stronger designed ground motion is considered To this end, a high-fidelity analysis model should be analyzed by FEM. We are implementing tensorial non-linear soil constitutive relations based on the multiple shear mechanism model [4,5,6] and the excess pore water pressure model [7] in order to accurately and efficiently simulate the behavior of soil under liquefaction, to create an analysis model of high fidelity. The developed 3D multiple shear mechanism model is studied, and we show that the proposed model depicts non-linear soil behavior similar to the original model, and the required memory is reduced drastically. Development of Non-Linear Constitutive Relation Based on Multiple Shear Mechanism
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