不確定性を考慮した免震橋梁の性能評価に関する一考察

抄録

The seismically isolated bridge is generally designed so that the seismic isolation device would absorb total energy mainly. So the pier would behave in stationary range. However, under the huge earthquake, it would be realistic to allow the pier inelastic behavior as well and to design so that both the seismic isolation device and the pier absorb the energy.This paper presents Monte Carlo simulation reliability analysis of RC isolated bridge based on results of dynamic analysis considering uncertainty of material properties of two structural members e.g. the pier and laminated rubber bearing and earthquake waves. Then, the distribution characteristics of dynamic responses of these members were discussed. Furthermore, what the primary nonlinear and the secondary nonlinear should be discussed in term of probability. According to the evaluation, we assume that yield strength of the concrete pier could be reduced.