钢结构基本构件的抗震延性分析.pdfVIP

第六届全国土木工程研究生学术论坛 清华大学 2008 钢结构基本构件的抗震延性分析 傅华风，朱召泉 (河海大学土木工程学院，江苏南京210098) 摘 要：结构体系的延性对于建筑物的抗震性能有着至关重要的意义。本文主要研究梁、柱等基本钢构件的 延性性能。首先，把基本构件转换为标准梁模型，然后，用塑性破坏机构法，建立标准梁的局部塑性屈曲模型， 运用基于最小势能原理的塑性分析，获得了屈曲临界后的M-θ 曲线，并结合解析方法（仅能获得对应最大弯矩的 M-θ 曲线），从理论上得到了完整的M-θ 曲线。通过综合考虑屈服率、应变率和周期荷载的影响对上述M-θ 曲线修 正后，从而能够反应构件在地震中的真实工作性能。通过有限元软件ANSYS 以及标准梁转角承载力的计算程序 DuctRot-M对上述M-θ 曲线进行对比，两种方法所得结果吻合较好。上述基本构件的延性分析结论对结构延性研 究提供了理论基础，从而可使得延性分析从定性转向定量。 关键词：延性；基本构件；抗震；塑性机构；塑性屈曲；转动承载力 The ductility analysis of seismic resistant of steel structural basic member Fu Huafeng , Zhu Zhaoquan (Civil Engineering School of Hohai University, Nanjing 210098, China) Abstract: The ductility of structure system is of importance to earthquake resistance of the buildings.This article mainly studies the ductility of basic steel members such as standard beams and columns. First ,the basic steel members were transformed into standard beam models.Then the standard beam’s local plastic buckling models are established using plastic collapse mechanism method.Using the plastic analysis based on the principle of the minimum of the total potential energy, the post-buckling curve of moment-rotation is obtained, and combining with the analytical methods which are limited in plotting the moment-rotation curve just until the maximum moment value, the complete moment-rotation curve can be obtained. Correcting the moment-rotation curve considering the dynamic effects of seismic loading such as the influence of yield ratio, strain-rate, cyclic loading, it can show the real working performance in the earthquake.By using the finite element Program named ANSYS and DuctRot-M computer program used to evaluate the rotat