考虑结构空间作用的RC框架梁轴向约束刚度研究  

Research on axial constraint stiffness of RC frame beams considering structural spatial effect

作　　者：季静[1,2] 黄芷若 丁迅 杨坚 林鹏 郑振光 韩小雷[1,2] JI Jing;HUANG Zhiruo;DING Xun;YANG Jian;LIN Peng;ZHENG Zhenguang;HAN Xiaoei(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Building Science(South China University of Technology),Guangzhou 510640,China;Guangzhou Pearl River Foreign Investment Architectural Designing Institute Co.,Ltd,Guangzhou 510060,China)

机构地区：[1]华南理工大学土木与交通学院,广州510640 [2]亚热带建筑科学国家重点实验室(华南理工大学),广州510640 [3]广州珠江外贸建筑设计院有限公司,广州510060

出　　处：《建筑结构》2024年第20期112-120,111,共10页Building Structure

基　　金：国家自然科学基金项目(52178483、52378515);广东省自然科学基金(2024A1515010536);亚热带建筑科学国家重点实验室自主研究课题(2022KA02)。

摘　　要：为真实反映结构对框架梁的空间约束作用,提出了轴向约束刚度指标以量化结构空间约束,并建立可模拟框架结构空间约束作用的数值模型。对比足尺框架结构试验数据表明,按规范计算的框架梁抗弯承载力与试验值相对误差为42%~75%,考虑结构轴向约束作用后相对误差缩小至25%以内,说明该模型可较好地模拟框架结构轴向约束作用,验证了该数值模型的合理性和可靠性。在有限元软件SAP2000中建立等效弹性数值模型,通过单参数分析得到对RC框架梁轴向约束刚度有显著影响的关键变量。在常见工程的取值范围内对关键变量进行充分的排列组合,开展规模化数值分析并总结结构空间约束的作用机理与RC框架梁极限状态下轴向约束刚度分布规律,得出了极限状态下RC框架梁轴向约束刚度的计算方法。To truly reflect the spatial constraint effects of the structure on the frame beam,the axial constraint stiffness index was proposed to quantify the spatial constraint effect of the structure and a numerical model was established to simulate the spatial constraint effects of the frame structure.Comparing with the test data of the full-scale frame structure shows that the bending capacity of the frame beam calculated according to the specifications has a relative error ranging from 42%to 75%,but after considering the axial constraint effects of the structure,the relative error is reduced to less than 25%,which shows that the model can simulate the axial constraint effect of the frame structure and verifies the rationality and reliability of the numerical model.The equivalent elastic model was established in the finite element software SAP2000.By single-parameter analysis,the key variables that have significant influence on the axial constraint stiffness of RC frame beams were found out.These key variables were fully arranged and combined within the value range of common projects,and large-scale numerical analysis was carried out to analyze the mechanism of structural space constraints and the distribution law of axial constraint stiffness of RC frame beams under the limit state,and the calculation method of axial constraint stiffness of RC frame beams under the limit state was obtained.

关 键 词：钢筋混凝土框架结构 结构空间作用 轴向约束刚度 规模化数值分析 分布规律 回归分析 

分 类 号：TU375[建筑科学—结构工程]