考虑RC楼板作用的组合节点抗震性能参数分析  

Parameter Analysis of Seismic Behavior of Composite Joint Considering Effect of RC Slab

作　　者：张冬芳[1] 陈荣波 康彦彪 赵均海[1] 张磊 ZHANG Dong-fang;CHEN Rong-bo;KANG Yan-biao;ZHAO Jun-hai;ZHANG Lei(School of Civil Engineering,Chang an University,Xi'an 710061,Shaanxi,China;Laboratory Management Department,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安石油大学实验室管理处,陕西西安710065

出　　处：《建筑科学与工程学报》2022年第6期143-153,共11页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51508028,51878056);陕西省自然科学基础研究计划项目(2021JM-165,2021JM-170,2021JM-177);中央高校基本科研业务费专项资金项目(300102280203)。

摘　　要：为研究钢筋混凝土(RC)楼板对组合节点抗震性能的影响,设计5个1/2缩尺组合节点试件,考虑了楼板作用、节点构造等因素,进行其在柱端轴力和水平低周往复荷载联合作用下的试验研究。同时,考虑钢管内混凝土的约束效应、混凝土损伤与刚度恢复特性等,建立了组合节点非线性有限元模型,在验证模型有效性的基础上,研究了拓展参数对组合节点受力性能和初始刚度的影响规律。结果表明:楼板作用有利于提高组合节点的承载力和初始刚度,同时也会导致组合节点的破坏形态由梁端破坏转为柱端破坏,因此,楼板作用在组合节点研究中不容忽视;柱轴压比、楼板厚度、柱截面含钢率、梁柱线刚度比在一定范围内均会提高组合节点的抗弯承载力和初始刚度;梁柱线刚度比是影响组合节点破坏形态的关键参数,为了避免发生柱端破坏,带楼板的组合节点梁柱线刚度比建议为1.0左右,此时节点受力性能也较好。In order to evaluate the effect of reinforced concrete(RC)slab on seismic behavior of the composite joint,five scale 1/2 composite joint specimens were designed considering the slab effect and the joint construction,which were tested under the combined action of vertical axial force and horizontal low-cycle reversal load at column end.Meanwhile,the nonlinear finite element analysis(FEA)model of the composite joint was established considering the confinement effect,damage and stiffness recovery characteristics of concrete filled in steel tubes.Based on the validated FEA model,the influence law of the design parameters on the mechanical behavior and initial stiffness of composite joints was investigated.The results show that slab action is beneficial to improve the bearing capacity and initial stiffness of composite joints.However,the failure mode of composite joints sometimes can change from beam failure to column failure.Therefore,the slab effect cannot be ignored in the study of composite joints.The flexural capacity and initial stiffness of composite joints are enhanced with increasing of column axial compression ratio,floor thickness,column steel ratio,and beam-column linear stiffness ratio in a certain range.The beam-column linear stiffness ratio is the crucial parameter which can influence the failure mode of composite joints.The beam-column linear stiffness ratio of the composite joints with slab is recommended to be about 1.0 to avoid column failure,and the mechanical performance of the composite joints is also better.

关 键 词：组合节点 RC楼板作用 破坏形态 抗震性能 参数分析 

分 类 号：TU375[建筑科学—结构工程]