钢筋混凝土框架结构层间弹塑性位移计算方法及试验研究  

Calculation method and experimental study of elasto-plastic inter-story drift of reinforced concrete frame structures

作　　者：刘伯权[1] 马煜东 苏佶智 黄娇 LIU Boquan;MA Yudong;SU Jizhi;HUANG Jiao(School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑结构学报》2022年第2期116-126,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51578077),陕西省国际科技合作与交流计划项目(2016KW-056)。

摘　　要：钢筋混凝土框架结构的层间弹塑性位移是判别结构倒塌极限状态的重要指标,目前我国抗震规范规定的弹塑性位移限值仍是基于构件试验研究的结果,缺乏结构层面的计算方法和试验验证。为此,将规则框架结构的层间位移等效为梁柱组合体的侧移变形,分析组合体变形的组成,建立了梁柱组合体变形与构件变形的转换方法,提出了“强柱弱梁”型框架结构层间弹塑性位移及顶点位移的计算方法,将框架结构弹塑性变形问题的研究由构件层次过渡到了结构层次。同时,通过3榀“强柱弱梁”型平面框架试验,分析了框架结构层间位移角及弹塑性阶段构件变形与梁柱组合体变形关系的演化规律,并对所建立的计算方法进行了验证。结果表明,梁变形贡献在加载初期受轴压比影响较大,其随轴压比的增加而减小;轴压比较小时,节点变形贡献极小,始终稳定在0.9%左右;对于“强柱弱梁”型框架,轴压比和梁柱线刚度比对梁柱组合体最终的变形组成影响较小;针对“强柱弱梁”型框架结构层间位移及顶点位移的理论计算结果与试验结果较为吻合。The elasto-plastic inter-story drift of reinforced concrete frame structures is an important criterion for checking whether a building collapses under rare earthquake.At present,the elastoplastic deformation limits specified in Chinese seismic code are obtained from relevant tests on structural members,without considering the overall system behavior,nor supported by the system-level tests.In this paper,the inter-story drift of frame structures was converted to the deformation of beam-column sub-assemblages.The deformation constitution of the sub-assemblages was analyzed.The transformation methods between the deformation of the sub-assemblages and members were established.The calculation methods of the inter-story drift angle and the overall lateral drift of the frame structures with‘strong column and weak beam’mechanism were proposed,with considering the deformation properties of frame structures.Three reinforced concrete frame structures were tested,the inter-story drift angle of the frame structures and the development of the relationship between the deformation of members and sub-assemblages were analyzed.The calculation methods were verified.The results show that the deformation contributed by the beams is greatly affected by the axial compression ratio at the initial stage of loading.The beam deformation decreases with the increase of axial compression ratio.The deformation contributed by the joints(about 0.9%)is negligible under a small axial compression ratio.The axial compression ratio and beam column linear stiffness ratio have little influence on the deformation constitution of the sub-assemblages for the frame structures with‘strong column and weak beam’mechanism.The calculation results of the inter-story drift angle and the overall lateral drift of the frame structures with“strong column and weak beam”mechanism show good agreement with the test results.

关 键 词：钢筋混凝土框架结构 层间位移角 梁柱组合体 拟静力试验 构件变形 变形组成 

分 类 号：TU375.4[建筑科学—结构工程]