型钢混凝土L形截面柱压弯剪扭的抗震性能  

Seismic behavior of steel reinforced concrete L-shaped columns under compression-bending-shear and torsion

作　　者：莫琳琳 陈宗平[1,2] 徐定一 Mo Linlin;Chen Zongping;Xu Dingyi(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Stiucture 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：《土木工程学报》2021年第9期66-78,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(51268004,51578163);广西八桂学者专项研究(2019[79])。

摘　　要：为研究型钢混凝土L形截面柱在压弯剪扭复合受力下的抗震性能,以配钢形式、扭弯比以及肢高肢厚比为变化参数,对12根型钢混凝土L形柱进行恒定轴力下低周反复弯-剪-扭的试验。基于试验数据,对比分析L形柱的破坏特征、滞回曲线以及延性、刚度、耗能等特征点参数;重点研究在压弯剪扭复合受力下不同配钢形式对L形柱抗震性能指标的影响。结果表明:型钢混凝土L形柱的破坏特征差异主要取决于扭弯比的大小,可分为弯曲破坏、弯剪破坏以及弯扭破坏;配钢形式对试件最终破损程度有影响。弯矩-位移、扭矩-扭转角滞回曲线均出现捏拢效应。增大扭弯比可以提高试件抗扭能力但抗弯能力变弱,刚度退化越快;减小肢高肢厚比可以提高型钢混凝土L形截面柱的延性和耗能。综合对比可知,在压弯剪扭复合受力下,空腹式T型钢混凝土L形截面柱具有较好的抗震性能。To investigate the seismic performance of steel reinforced concrete( SRC) L-shaped columns under compression-bending-shear and torsion,12 steel reinforced concrete L-shaped columns were tested,in which the steel layout form,the torsion bending ratio,and the ratio of limb height to limb thickness were considered. Based on the test data,the failure characteristics,hysteretic curves,ductility,stiffness and energy dissipation of the L-shaped columns were compared and analyzed. The influence laws of different steel forms on the seismic performance index of the L-shaped column under the combined stress of compression-bending-shear and torsion were studied. The results show that the failure characteristics of SRC L-shaped columns with different torsion to bending ratios can be divided into bending failure,bending shear failure and bending torsion failure. The steel layout form affects the final damage degree of the specimens and the moment-displacement and torque-torsion angle hysteretic curves exhibit a pinch effect. The torsion resistance of the specimen increases with the torsion to bending ratio,while the bending capacity becomes weaker,and the stiffness degradation is faster. The ductility and energy dissipation of the SRC L-shaped columns can be improved by reducing the ratio of limb height to limb thickness. A comprehensive analysis shows that the open web T-shaped SRC Lshaped column has good seismic performance under the combined stresses of compression-bending-shear and torsion.

关 键 词：型钢混凝土 L形截面柱 配钢形式 压弯剪扭 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程]