竖向不规则框架结构静力弹塑性分析的侧向荷载分布研究

Lateral Load Pattern for Vertically Irregular Frame Structure in Pushover Analysis

侧向荷载分布模式的选取是静力弹塑性分析中的一个关键问题,尤其当高振型影响显著和结构不规则时其选取直接影响静力弹塑性(Pushover)分析结果。针对竖向不规则多高层结构楼层侧向刚度突变的特点,从楼层质量、侧向刚度、振型参与系数等影响因素出发,提出了一种改进的固定侧向荷载分布模式。本文对四种竖向不规则形式的结构在不同侧向荷载分布模式下进行Pushover分析,并与时程分析结果进行比较,研究了不同侧向荷载分布模式Pushover分析结果的有效性和适用性。

It is a key stage to select proper lateral load patterns in the pushover analysis,especially when higher modes influence is important and the structure form is irregular.A simple fixed lateral load pattern is developed with some important factors,such as story weight,story lateral stiffness and mode participation ratio,in which the particularity of irregular structure can be considered.In this paper,several common lateral patterns used in the pushover procedure are verified to be valid and applicable,according to the results of the nonlinear dynamic analysis for four types of vertically irregular structures.