水平荷载下底部框架的内力计算方法  

Forces calculation of bottom frames of multi-story masonry buildings under horizontal loads

作　　者：郑文忠[1] 闫凯[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《华中科技大学学报（自然科学版）》2011年第4期119-123,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：教育部长江学者奖励计划资助项目(2009-37);高等学校博士学科点专项科研基金资助项目(20092303110046);黑龙江省自然科学基金资助项目(E200916)

摘　　要：为研究水平荷载下底部框架砖房的底部框架力学性能,对400个考虑上部砌体影响的底部框架进行有限元分析,考察了底部框架梁柱线刚度比和托梁高跨比对水平荷载下,底部框架托梁梁端弯矩与框架柱顶端弯矩比值、托梁梁端轴力与框架柱剪力比值、托梁梁端剪力与框架柱轴力比值;底部框架柱的反弯点和剪力分配的影响规律,以及托梁的内力分布.结果表明:与纯框架相比,考虑上部砌体影响时的框架托梁梁端弯矩和剪力均较小,梁端轴力较大.基于底部剪力法,给出了考虑上部砌体影响的水平荷载下该类建筑的底部框架内力计算方法.In order to study the mechanical behavior of the bottom frames of multi-story masonry buildings under horizontal load, 400 bottom frames were analyzed by finite element method considering the effect of upper brick masonry. The effect of some parameters was investigated, including stiffness ratio of beam to column and depth-span ratio of the joist on the moment ratio of the end of the joist and the top of the column, the ratio of axial force at the end of the joist and shear force at the top of the column, the ratio of shear force at the end of the joist and axial force at the top of the column, the position of inflection point of the column, shear force distribution in bottom columns, and force distribution of the joist. The results show that compared with pure frame, both moment and shear force at the end of the joist are smaller, and axial force at the end of the joist is larger. Based on equivalent base shear method, calculation method for the force of the bottom frames of multi-story masonry buildings with the effect of upper brick masonry under horizontal load was proposed

关 键 词：底部框架 水平荷载 内力计算 托梁 反弯点 底部剪力法 

分 类 号：TU375.4[建筑科学—结构工程] TU362