钢连梁-部分外包组合剪力墙弱节点抗震性能研究  

Study on seismic performance of weak joints in steel coupling beam-partially encased composite shear wall

作　　者：贺小刚 石韵 苏明周[1,3] 陈锘 HE Xiaogang;SHI Yun;SU Mingzhou;CHEN Nuo(School of Civil Engineering,Xi’an University of Architecture and Technology,710055 Xi’an,China;School of Mechanical Engineering,Xi’an Shiyou University,710065 Xi’an,China;National Experimental Teaching Demonstration Center for Civil Engineering(XAUAT),710055 Xi’an,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安石油大学机械工程学院,西安710065 [3]西安建筑科技大学国家级土木工程实验教学中心,西安710055

出　　处：《应用力学学报》2023年第2期350-363,共14页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51908461);陕西省高校科协青年人才托举计划(No.20200426)。

摘　　要：为研究钢连梁-部分外包组合剪力墙弱节点的抗震性能,设计出钢连梁-部分外包组合剪力墙模型试件。通过有限元软件ABAQUS,对其进行低周往复加载数值模拟,研究混凝土强度、水平加劲肋和竖向加劲肋构造形式、连梁跨高比等因素对节点抗震性能的影响。分析表明:钢连梁-部分外包组合剪力墙节点抗震性能优良,滞回曲线饱满且稳定,位移延性系数大于3,跨高比不大于3.8的试件梁端极限转角均达到0.05 rad,节点试件延性较好;混凝土强度的提高能够提高节点试件初始刚度,水平加劲肋和竖向加劲肋的设置提高了对墙肢混凝土的约束作用,能够有效阻止裂缝扩展速度。加劲肋是节点区域应力传递的有效途径,加劲肋的设置使节点区的应力能够平稳传递到相邻区域,降低了加载后期荷载下降速度,提升了节点抗震性能;随着连梁跨高比的增加,节点的承载力和刚度降低。当连梁跨高比大于3.8时,梁端极限转角由0.05 rad降至0.03 rad。In order to study the seismic performance of weak joints of steel coupling beam-partially enclosed composite shear wall,a model specimen of the steel coupling beam-partially enclosed composite shear wall was designed,and the low-cycle reciprocating loading numerical simulation was carried out through the finite element software ABAQUS.The influences of factors such as concrete strength,the details horizontal stiffener and vertical stiffener,and span-to-height ratio of connecting beams on the seismic performance of joints are studied.The analysis results show that the steel coupling beam-partially enclosed composite shear wall joint has excellent seismic performance,the hysteretic curve is full and stable,the displacement ductility coefficient is greater than 3,the limit angle of the beam end of some specimens can reach 0.05 rad,and the specimen ductility is good.The increase of concrete strength can improve the initial stiffness of joint specimen.The setting of horizontal stiffeners and vertical stiffeners improves the restraint effect on the wall concrete and can effectively prevent the crack propagation speed.The setting of stiffener is an effective way of stress transfer in the joint area,which enables the stress in the joint area to be smoothly transferred to the adjacent area,reduces the load drop speed in the later stage of loading,and improves the seismic performance of the joint as the span-to-height ratio of the connecting beam increases When the span-to-height ratio of the connecting beam is greater than 3.8,the limit angle of the beam end is reduced from 0.05 rad to 0.03 rad.

关 键 词：钢连梁 混合联肢PEC墙 弱节点 抗震性能 有限元分析 

分 类 号：TU391[建筑科学—结构工程]