多因素作用下承重墙刚度退化伪静力试验研究  

Study on pseudo static test of stiffnessdegeneration of bearing wallunder role of multi factors

作　　者：汪澜涯 彭斌[1] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《水资源与水工程学报》2015年第5期197-202,共6页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51208300);上海市专业学位研究生基地项目(10252085213);2015年度上海理工大学研究生核心课程建设项目

摘　　要：为研究砂浆强度、开洞率和高宽比3个因素对砌体承重墙刚度退化的影响,以3层砌体房屋的底层承重墙为原型,设计4片1∶2的缩尺试件进行伪静力试验。试验结果表明:在加载初期,各因素影响类似,刚度退化均较快;试件开裂后,刚度退化均放缓,各试件在开裂、极限和破坏等特征点的刚度退化系数在76%、20%和16%左右。砂浆强度愈低,砂浆粘结性能较差,试件初始刚度愈小,开裂后刚度退化稍缓,试件塑性变形小。开洞率愈大,初始刚度愈小,开裂后刚度退化加剧,试件塑性变形最小。高宽比愈大,初始刚度愈小,开裂后刚度退化幅度最小。研究成果可为深入探讨各因素对砌体墙刚度退化的研究提供参考。To study the effect of three aspects such asmortar strength , of opening rate and ratio of height and width on thestiffness degradationof masonry bearing walls ,the paper took the bottom walls of a 3-sto-ry masonry structure as prototype ,and designed four scaled wall specimens to carry out pseudo static test . The results show that the stiffness degenerates quicklyat the preliminary stage of loading .The influence of every factor is similar .The stiffness degradation slows downafter cracking of test-piece .Thecoefficient stiff-ness degradation at some feature points such as crack load , ultimate load and failure load is respectively about 76%, 20%and 16%.The lower the mortar strength ,the poorer the viscidity of mortar .Thelessthe initial stiffness , the slower the stiffness degradates after cracking , theplastic deformationof test-piece is small.The lager ratio of openings, the smaller initial stiffness.thestiffness degradation intensify after cracking .The plastic deformation is the minimum .The larger the ratio of height and width , the less the initial stiffness ,the stiffness degradation is the minimum .Theresult can provide reference for further re-search of effect of every factor on stiffness degeneration of masonry wall .

关 键 词：砌体承重墙 砂浆强度 开洞率 高宽比 刚度退化 伪静力试验 

分 类 号：TU317[建筑科学—结构工程] TU364