基于截面纤维模型的弹塑性时程分析方法

为了得到适用性更广、稳定性更高的弹塑性时程分析方法，采用了通过材料本构关系直接反映构件恢复力特性的截面纤维模型，提出了基于该模型的计算方法和相应的材料本构关系；通过与钢筋混凝土柱拟动力反复加载试验对比，检验了该计算模型的准确性；对典型的底部框架多层砌体房屋在罕遇地震作用下的弹塑性变形性能进行了实例分析.试验对比及实例分析结果表明，所提出的计算方法及本构模型可描述结构构件进入弹塑性阶段后承载力下降的现象，直接反映构件轴力与弯矩的相互作用，适用于结构在罕遇地震作用下的弹塑性时程分析和抗震性能评估

Nonlinear time history analysis based on section fiber model

The section fiber model was used for developing more reliable and more stable nonlinear time history analysis method, and the stress-strain relationships of concrete and reinforcement were proposed. The experimental results of an RC column under cyclical lateral load, the reliability of the method and the proposed models were checked. Nonlinear time history analysis on seismic performance of typical piloti structures under high intensity earthquake showed that the section fiber model and the proposed material relationships can represent the descend of the capacity of structural member, reflect the interaction among the structural member's axial force and bending moment, and are suitable for nonlinear time history analysis of structure under high intensity earthquake.