型钢混凝土十字形柱复合受扭滞回性能试验研究  

Experimental study on hysteretic behavior of steel reinforced concrete cross-shaped column under combined action of compression-flexure-shear and torsion

作　　者：陈宗平[1,2] 刘祥[1] 陈建佳 CHEN Zongping;LIU Xiang;CHEN Jianjia(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《建筑结构学报》2020年第6期108-118,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51268004,51578163);广西自然科学基金重点项目(2016GXNSFDA380032);广西八桂学者专项研究项目([2019]79号)。

摘　　要：为研究型钢混凝土十字形柱在压弯剪扭反复荷载作用下的的滞回性能,以扭弯比和配钢形式为变化参数,对9根柱试件进行了拟静力试验,对比分析各柱的破坏形态、滞回曲线、骨架曲线、承载能力、延性等。研究表明:恒定轴力反复弯剪扭作用下,型钢混凝土十字形柱表现为弯扭破坏和扭剪破坏两种破坏模式;荷载-位移滞回曲线与扭矩-扭转角滞回曲线均呈捏拢的S形;位移延性系数、开裂位移角及破坏位移角均能满足GB 50011-2010《建筑抗震设计规范》要求;弯剪黏滞阻尼系数随位移的增加呈上升趋势,而扭转黏滞阻尼系数则相反;当扭弯比小于0. 21时,扭矩的存在并未降低试件受弯承载力,但是对弯曲位移、延性及耗能能力均会有不利影响。In order to study the hysteretic behavior of steel reinforced concrete( SRC) cross-shaped column under compression-flexure-shear-torsion,taking the torsion-bending ratio and shaped-steel layout as the selected parameters,a total of nine SRC cross-shaped columns were designed for the quasi-static test subjected to cyclic loading. The failure patterns,hysteretic curves,skeleton curves,bearing capacity and ductility of SRC cross-shaped columns were studied.Under constant axial compression and cyclic reversed flexure-shear-torsion loading,the specimens show bending-torsion and torsion-shear failures. The load-displacement and torque-torsion curves are in "S"shape with obvious pinching.The ductility coefficient,crack point drift and failure point drift can meet the requirements of GB 50011-2010 ‘Code for seismic design of buildings ’. With the increase of displacement,the bending viscous damping coefficient increases,while the torsion viscous damping coefficient decreases. With the torsion-bending ratio less than 0. 21,the torsion has no influence on the flexural bearing capacity,but it shows unfavorable effect on the flexural displacement,ductility and energy dissipation capacity.

关 键 词：型钢混凝土 十字形柱 压-弯-剪-扭 拟静力试验 滞回性能 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1