压弯剪扭实腹型钢混凝土柱抗震性能试验研究  

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF STEELREINFORCED CONCRETE COLUMNS UNDER COMPRESSIONFLEXURESHEAR-TORSION COMBINED ACTIONS

作　　者：陈宇良[1,2] 吉云鹏 陈宗平 CHEN Yu-liang;JI Yun-peng;CHEN Zong-ping(School of Civil Engineering,Guangxi University of Science and Technology,Liuzhou,Guangxi 545006,China;Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education,Guangxi University,Nanning,Guangxi 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：《工程力学》2023年第11期155-167,共13页Engineering Mechanics

基　　金：国家自然科学基金项目(51908141);广西自然科学基金项目(2019GXNSFBA245030);中国博士后科学基金项目(2021M693854);广西科技大学博士基金项目(校科博18Z09);广西研究生教育创新计划项目(YCSW2021319)。

摘　　要：为研究型钢混凝土(SRC)柱在压弯剪扭复合受力状态下的抗震性能,以截面尺寸、型钢含钢率、纵筋配筋率、体积配箍率和栓钉位置为变化参数,完成了12根型钢混凝土柱和1根钢筋混凝土(RC)对比柱的压弯剪扭低周反复试验。观察了试件在复合受扭状态下的破坏形态,对比分析了各试件的滞回曲线、骨架曲线、刚度退化、耗能及延性性能。结果表明:在压弯剪扭受力状态下,所有试件均发生弯扭破坏;荷载-柱顶位移滞回曲线呈饱满的梭形,扭矩-扭转角曲线为捏拢的“S”形;增大截面尺寸和配筋率可有效提高SRC柱的抗扭和抗弯承载力;峰值荷载前,抗扭刚度的退化速率明显快于抗弯刚度的退化速率,增大型钢含钢率和配筋率可延缓SRC柱的刚度退化;SRC柱的抗弯耗能能力优于抗扭耗能能力,扭转延性大于弯曲延性;与方形截面相比,矩形截面具有更好的扭转变形能力;在工字钢翼缘上焊接栓钉可有效提高SRC柱的抗震性能;根据现行规范和试验数据,提出SRC柱构造设计的相关建议和扭转耗能退化的经验公式。In order to reveal the seismic behavior of steel-reinforced concrete(SRC)columns under compression-flexure-shear-torsion combined actions,twelve SRC columns and one reinforced concrete(RC)column were tested by comprehensively considering the cross-sectional dimension of the column,the steel ratio,the reinforcement ratio,the stirrup ratio and,the welded stud location.The failure characteristics of specimens under composite torsional conditions were observed,and the influence of different parameters on the seismic indexes of SRC columns were analyzed,such as hysteric curve,stiffness degradation,energy dissipation and ductility.The test results indicate that the failure patterns of specimens mainly appear as the bending-torsion composite failure occurs.The load-displacement hysteric curves present full spindle shapes,and the torque-torsion angle curves are in“S”shapes with obvious pinching.The torsional and flexural bearing capacity of SRC columns can be effectively improved by increasing the section size or reinforcing ratio.Before the peak load,the degradation rate of torsional stiffness is significantly faster than that of flexural stiffness and,increasing the steel ratio and reinforcement ratio can delay the degradation of SRC column stiffness.The bending energy dissipation capacity of SRC columns is better than the torsional energy dissipation capacity,and the torsional ductility is greater than the bending ductility.SRC columns with rectangular cross-sections have better torsional deformation capacity than those with square cross-sections.Welding studs on I-shaped steel flanges can effectively improve the seismic behavior of SRC columns.According to the current seismic code and test data,some suggestions of structural measures of SRC columns and empirical formula of torsional energy degradation are put forward.

关 键 词：压弯剪扭 复合受力 型钢混凝土柱 抗震性能 拟静力试验 

分 类 号：TU398.1[建筑科学—结构工程]