A Study on Performance Based Aseismic Design Method of Structure-Foundation System for Level 2 Seismic Input Motion

动力相互作用对土-结构体系的影响已被许多研究人员所讨论，考虑动力相互作用的抗震设计方法是非常必要的。因此，建立考虑土-结构动力相互作用体系的基于性能的抗震设计方法是本研究的目标之一。我们的研究结果总结如下：(1)我们尝试在简单的摇摆-摇摆(SR)模型中加入土-结构动力相互作用的影响。然而，评估摇摆和摇摆弹簧的程序还没有很好地建立起来。本文提出了用Pushover分析计算桩-土相互作用的土弹簧的方法。(2)提出了考虑土-桩-土相互作用体系的强度需求谱，并讨论了强度需求谱的特点。(3)通过对比强度需求谱，考察了桩基础的非弹性行为对抗震性能的影响。研究了桥墩和桩基的弹塑性变形对结构体系抗震性能的影响。

Effects of dynamic interaction to the soil-structure system have been discussed by many researchers and aseismic design procedures taking into account the interaction effects are strongly expected. So an objective of this study is to establish a performance based aseismic design procedure taking into ac count dynamic Soil-structure interaction system. Our results are summarized as :(1) we try to incorporate the effects of the dynamic soil-structure interaction can be adapted briefly in the simple Sway-Rocking(SR) model. The procedure to evaluate the sway and rocking springs, however, has not been well established yet. We here propose the method to evaluate the soil springs of the soil-pile interaction by using pushover analysis. The results are compared with those of the finite element analysis and both are in good agreement.(2) Strength demand spectra taking into account soil-pile-interaction system are proposed and the characteristics of those specta are discussed.(3) we examined the effects of the inelastic behavior of the pile-foundations on the aseismic performance by comparing the strength demand spectra. We investigated the relationship between the inelastic deformation of the pier and the pile-foundation on the aseismic performance of the structure systems.