| Budget Amount *help |
¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2010: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Research Abstract |
In the present study, settlement phenomena of a railway ballasted track are simulated with 3-D FEM. Computational cost of 3-D ballast settlement analysis is reduced using a time-domain homogenization method, a multi-time scaling method or a cyclic densification model. The material parameters for the extended subloading surface elastoplasticity model are identified using the particle swarm optimization(PSO). The numerical method for simulating the variation of ballast settlement caused by the randomness of material parameters is developed with the first-order second-moment method(FOSM).
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