均质场地非线性地震反应的半解析算法

A seimi- analytic computational method for nonlinear seismic response of homogeneous foundations

运用动态应力_应变关系及其推广的Masing加卸载准则,考虑土体在地震等产生的不规则加载条件下的非线性滞回特征,将增量法与相应场地地震线性反应解析解相结合,提出了该问题的非线性地震反应的半解析时域算法.针对Seed_Idriss给出的砂土平均曲线,计算了均匀密砂的非线性地震反应.算例结果表明,该算法是合理可行的.

The dynamic constitutive relationship of soil body, together with the extended Masing＇s rules, is employed to account for nonlinear hysteretic property of soil material under transient or cyclic loadings. Incremental method and the analytic solution to the soil material seismic response are combined to develop a seimianalytic calculating technique for dynamic nonlinear problem. Afterwards, a nonlinear analysis procedure is presented and numerically implemented for evaluating seismic response of homogeneous sand. The results of the examples indicate that this algorithm is rational and feasible.