基于等效弹簧单元的砌体填充墙框架结构有限元分析  

Finite element analysis of masonry- infilled frame structure based on equivalent spring element

作　　者：周晓洁[1] 陈培奇[1] 崔金涛[1] 

机构地区：[1]天津城建大学土木工程学院,天津300384

出　　处：《世界地震工程》2015年第3期23-32,共10页World Earthquake Engineering

基　　金：天津市科技支撑计划重点项目(12ZCZDSF00500);国家973项目(2011CB013603);天津市自然科学基金一般项目(13JCYBJC39100)

摘　　要：针对当前砌体填充墙框架结构数值模拟中缺乏简单有效的填充墙建模方法,缺少对填充墙-框架刚性连接和柔性连接的考虑等问题,提出了基于等效弹簧单元的填充墙框架结构有限元分析方法。首先,将填充墙框架结构拆分成空框架和等效约束填充墙,其中等效约束填充墙综合考虑了填充墙对框架柱的侧向约束,以及主体框架对填充墙的闭合约束;其次,在粉煤灰空心砌块墙体及砌体填充墙框架结构水平往复荷载试验的基础上,分析了墙-框刚性连接与柔性连接情况下等效约束填充墙的力学性能,提出了填充墙的滞回曲线模型及等效弹簧有限元分析模型;最后,分别进行了刚性连接和柔性连接填充墙框架结构水平单调荷载作用下的有限元试验拟合。计算结果表明:等效弹簧单元能够有效模拟等效约束填充墙的工作,且建模方式简便易行,特别适用于砌体填充墙框架整体结构的数值模拟分析。Aiming at the lack of simple and effective modeling method of filling wall and lack of consideration of rigid connection and flexible connection between filled wall and frame in the current numerical simulation of mason- ry-infilled frame structure, the finite element analysis method of wall-infilled frame structure based on equivalent spring element was proposed. First, the wall-infilied frame structure was split into empty frame and equivalent con- straint filled wall, in which the equivalent constraint filled wall considering the lateral constraint of filling wall with frame column, and the closure constraint of main frame with infilled wall. Then, based on the low cyclic horizontal load tests of fly-ash hollow block walls and masonry-infilled frame structure, the mechanical behaviors of equivalent constraint filled wall under rigid connection and flexible connection between filled wall and frame were analyzed and the hysteretic curve model and equivalent spring finite element analysis model of infilled walls were proposed. Fi- nally, the fitting between numerical simulations and experimental tests of wall-infilled frame structure with rigid connection and flexible connection under monotonic horizontal load test were performed respectively. Calculation re-suhs show that the equivalent spring element can effectively simulate the effect of equivalent constraint filled wall, and the modeling method is simple and convenient, which is especially suitable for the numerical simulation analy- sis of masonry-infilled frame structure.

关 键 词：填充墙框架结构 刚性连接 柔性连接 等效弹簧单元 有限元分析 

分 类 号：TU323.5[建筑科学—结构工程] TU375.4