复合受扭实腹式型钢混凝土柱恢复力模型研究  

A study on the restoring force model of composite torsional solid web steel reinforced concrete columns

作　　者：陈宇良[1,2] 李浩 陈宗平 CHEN Yuliang;LI Hao;CHEN Zongping(College of Civil and Architecture Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Engineering Research Center for Safety Prevention and Control of Assembly Structure,Guangxi University of Science and Technology,Liuzhou 545006,China;Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]广西科技大学广西装配结构安全防控工程研究中心,广西柳州545006 [3]广西大学工程防灾与结构安全教育部重点实验室,南宁530004

出　　处：《振动与冲击》2023年第8期69-78,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(51908141);广西自然科学基金(2019GXNSFBA245030);广西科技大学博士基金项目(校科博18Z09)。

摘　　要：为研究复合受扭作用下实腹式型钢混凝土柱的恢复力模型,考虑扭弯比、轴压比和剪跨比的影响,完成了9个实腹式型钢混凝土柱的拟静力加载试验,获取了扭矩-扭转角骨架曲线和滞回曲线,分析了扭弯比、轴压比和剪跨比等试验变化参数对其扭转滞回性能的影响。基于试验扭转骨架曲线和滞回曲线,提出以屈服点、峰值点和破坏点为特征点的三折线骨架曲线模型,同时对滞回规则进行简化,建立实腹式型钢混凝土柱复合受扭恢复力模型。结果表明:随着扭弯比的增大,试件破坏形态由弯曲破坏为主转为扭转破坏为主;扭弯比对实腹式型钢混凝土柱的抗扭承载力影响最大;在扭转骨架曲线特征参数计算时考虑了扭弯比、轴压比和剪跨比的影响,计算结果与实测结果吻合较好。提出的考虑卸载刚度退化影响的扭转恢复力模型,能较好地预测复合受扭作用下实腹式型钢混凝土柱的扭转滞回曲线,可为此类结构在压弯剪复合受扭作用下的弹塑性地震分析提供参考。In order to study the restoring force model of solid-web steel reinforced concrete columns under the effect of composite torsion,nine solid-web SRC columns were tested through a quasi-static loading test by considering the three main factors of torsion bending ratio,axial compression ratio,and shear span ratio.The torque-torsion angle skeleton curves and the hysteretic curves were obtained,and the influence laws of the torsion hysteretic performance under different torsion bending ratios,axial compression ratios,and shear span ratios were analyzed.Based on the experimental torque-torsion angle skeleton curves and the hysteretic curves,a trilinear model of the skeleton curve with the yield point,peak point,and failure point as characteristic point was proposed,while the hysteretic laws were simplified;the restoring force model under composite torsion of solid-web SRC column was established.Results show that with the increase of torsion bending ratio,the failure mode of specimens changed from bending failure to torsional failure.The torsion resistance of solid-web SRC columns is mostly influenced by torsion bending ratio.The torque-torsion angle skeleton curves’calculation results under different torsion bending ratios,axial compression ratios,and shear span ratios are in good agreement with the experiments.The proposed torsional restoring force model considering the influence of unloading stiffness degradation also preferably predicts the torsional hysteretic curves of solid-web SRC columns.The results can provide a reference for elastic-plastic seismic response analysis of such structures under complex stress states.

关 键 词：实腹式型钢混凝土 复合受扭 滞回曲线 骨架曲线 扭转恢复力模型 

分 类 号：TU398[建筑科学—结构工程] TU375.3