塑性阶段联肢墙墙肢基底内力变化规律及其简化计算方法  

Variation and simplified calculation of base forces in wall piers for coupled walls during plastic stage

作　　者：陈永盛[1] 刘韬 张令心[1] CHEN Yongsheng;LIU Tao;ZHANG Lingxin(Institute of Engineering Mechanics,China Earthquake Administration,Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2021年第6期19-32,共14页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项(2019A02);国家自然科学基金面上项目(51678542);黑龙江省头雁行动计划。

摘　　要：联肢墙进入塑性阶段后墙肢会出现明显的内力重分布现象,分析并计算墙肢内力是实现合理设计及高效评估的前提。目前,塑性阶段墙肢内力通常采用复杂费时的有限元模拟获得,缺乏实用的简化计算方法。文中首先基于OpenSees平台分析了联肢墙墙肢基底内力的变化特点和规律;在此基础上,利用分析得到的附加轴力系数在塑性阶段稳定变化的特性和附加轴力与基底剪力呈三折线形式变化的规律,提出了墙肢基底附加轴力简化计算方法;然后,通过考虑附加轴力对墙肢刚度的影响,按照各墙肢刚度比例关系分配内力,给出了塑性内力重分布后墙肢剪力和弯矩的简化计算方法;最后,通过与算例数值模拟结果的对比,验证了文中简化计算方法的有效性与合理性。The significant redistribution of forces in wall piers(WPs)occurs as the coupled wall(CW)enters into plastic stage.Analysis and calculation of the forces in the WPs are essential to the reasonable design and efficient assessment of CWs.Currently,an effective and simple method of calculating forces in WPs during plastic stage is lacking,and the forces are mainly obtained via using complex and time-consuming finite element analysis.In this study,the characteristic and progression of changes to forces in WPs were first investigated on the basis of OpenSees.Based on this,a simplified approach to calculating base additional axial forces(AAFs)of the WPs was proposed by using the characteristic of both a steady change in the coefficient of AAF during plastic stage and the trilinear relationship between AAFs and shear forces at base from analyses.Then,by considering both the impact of AAF on stiffness of WPs and the connection between the stiffness and the distribution of forces in WPs,a simple technique for determining the plastic redistribution of shears and moments in base of WPs was presented.Finally,the validity and rationality of the proposed method was proved by the comparison with numerical simulation data.

关 键 词：联肢剪力墙 计算方法 塑性阶段 附加轴力 内力重分布 

分 类 号：TU311[建筑科学—结构工程]