大跨空间结构的竖向静力弹塑性分析

对于大跨刚性空间结构,国内外关于静力弹塑性竖向抗震理论方面的研究成果还比较稀少;本文参照高层结构的静力弹塑性分析方法提出了一种新的大跨刚性空间结构竖向静力弹塑性计算方法即Push-down方法;对该方法的基本原理进行详细论述和推导,如竖向弹塑性能力谱和竖向需求谱的建立,并提出了几种竖向荷载式;通过一个计算实例,详细描述Push-down法的计算步骤.该方法可以对第一振型为竖向变形的大跨刚性空间结构进行有效的抗震性能评估,从而使设计人员全面了解在竖向地震作用下大跨刚性空间结构的动力特性和抗震性能.

Vertical Static Elasto-Plastic Analysis of Long Span Spatial Structure

Few researches on static elasto-plastic analysis method about vertical seismic response of long span spatial structure are found.According to Push-over method used in analysis of tall building,a new static elasto-plastic method,named Push-down,was proposed.The fundamental principle of the method was presented.The elasto-plastic capacity spectrum and inelastic demand spectrum were derived.Some kinds of vertical load patterns were proposed.Finally,a calculating example is given to explain the steps in detail.The aseismic performance of the long span spatial structures,whose first mode is vertical,can be simply and effectively evaluated by method of Push-down.Meanwhile,it easily enables the designer to understand and evaluate the dynamic characters and seismic performances of long span rigid spatial structures in vertical seismic response.