拉-压变轴力下小剪跨比RC剪力墙受剪试验研究  

EXPERMENTAL STUDY ON SHEAR BEHAVIOR OF LOW-ASPECTRATIO RC WALLS UNDER VARIABLE AXIAL TENSION-COMPRESSION FORCES

作　　者：黄健康 程小卫[1] 李易[1] 孙亚 HUANG Jian-kang;CHENG Xiao-wei;LI Yi;SUN Ya(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;China Architecture Design&Research Group Co.,Ltd,Beijing 100044,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]中国建筑设计研究院有限公司,北京100044

出　　处：《工程力学》2024年第S01期228-237,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(52108429);北京市科技新星计划项目(Z211100002121097);北京市教育委员会科技/社科计划项目(KM202210005018)。

摘　　要：近年来,高层建筑中底部剪力墙因受拉,处于拉-压变轴力和水平荷载耦合受力的问题得到了广泛的关注。为了研究拉-压变轴力下小剪跨比钢筋混凝土(RC)剪力墙的受剪性能,该文完成了3个剪跨比为1.0的RC剪力墙在拉-压变轴力下的往复受剪试验,研究参数为拉-压变轴力变化幅值和加载路径。结果表明:不同加载路径下RC墙均在压剪方向发生剪压破坏,压剪方向极限位移角为1.2%~1.4%;拉-压变轴力变化幅值改变墙体拉剪和压剪承载力,加载路径对墙体的拉剪强度有一定的影响,但对压剪强度影响很小;拉-压变轴力下剪力墙的滞回曲线呈现明显不对称现象,拉-压变轴力的变化幅值对滞回曲线的形状影响较小,但加载路径改变滞回曲线的形状;拉-压变轴力的变化幅值将增加剪力墙拉剪与压剪刚度的差别,在双肢墙结构中可能导致更多的剪力从受拉墙体转移到受压墙体;基于OpenSees建立了可准确模拟拉-压变轴力下RC剪力墙受剪行为的有限元模型。In recent years,extensive attention has been paid to shear behavior of RC shear walls subjected to coupled variable axial tension-compression forces.In order to investigate the shear behavior of RC walls under variable axial tension-compression forces,an experimental test was conducted on three low-aspect-ratio RC walls.The test variables are fluctuating ranges and loading paths of the variable axial forces.Test results indicated:The final failure of RC walls subjected to variable axial forces was controlled by the shear-compression failure in compressive-shear direction and the ultimate drift ratio in compressive-shear direction ranging from 1.2%to 1.4%.The fluctuating ranges of variable axial forces changed the tension-shear strength and the compression-shear strength,while the loading paths only affected the tension-shear strength.The hysteretic curves of RC walls subjected to variable axial tension-compression forces were asymmetric.The fluctuating range of axial forces had limited influence on the shape of hysteretic curves,while the loading patterns significantly changed the shape of these hysteretic curves.The fluctuating ranges of variable axial forces enlarged the difference between the tension-shear and the compression-shear stiffness,probably resulting in more shear force being transferred from the tension wall to the compression wall in coupled wall system.A numerical model was developed using OpenSees,which can accurately simulate the shear behavior of RC wall under variable axial tension-compression.

关 键 词：钢筋混凝土剪力墙 拉-压变轴力 往复受剪试验 破坏模式 承载力 

分 类 号：TU398.2[建筑科学—结构工程]