摘要
椭圆形GFRP管约束型钢混凝土柱是由椭圆形GFRP外管、内置型钢以及管内填充的混凝土组成。为研究该类柱的抗震性能,设计3根椭圆形GFRP管约束型钢混凝土柱,对其进行了恒定轴压和水平往复荷载试验,研究了椭圆形GFRP约束型钢混凝土柱的破坏形态、滞回曲线和延性等,分析了GFRP管厚度和侧向力加载方向(即绕椭圆形截面强轴加载或弱轴加载)对其抗震性能的影响。研究结果表明:试验柱均为弯曲破坏,GFRP管和混凝土的破坏主要在柱根部;GFRP管越厚,柱水平承载力越大,延性越好;绕强轴方向加载的柱承载力和延性都远大于绕弱轴方向加载的。基于OpenSees建立的数值模型可对滞回曲线进行偏于保守的预测。
Elliptical GFRP-confined profiled-steel reinforced concrete columns consist of an outer GFRP tube with an elliptical cross-section,an encased profiled-steel and the concrete-filled inside.Three elliptical GFRP-confined profiled-steel reinforced concrete columns were tested under constant axial compression and lateral cyclic loading to study their seismic behavior.The failure mode,the hysteretic curve,and the ductility of specimens were investigated to analyze the effects of the GFRP thickness and the loading direction(i.e.,the lateral cyclic loading around the strong axis or the weak axis)on seismic performance.The results indicate that all specimens fail with a flexural failure mode,and the damage of the GFRP tube and the concrete is localized at the bottom of the column.With the increase in GFRP thickness,the peak lateral load and the ductility of specimens increase.The peak lateral load and the ductility for the specimen loaded around the strong axis are much superior to the specimen loaded around the weak axis.The numerical model based on OpenSees can conservatively predict the hysteretic curve for elliptical GFRP-confined profiled-steel reinforced concrete columns.
作者
彭宇韬
张冰
周冲
朱恩仪
孙家铭
PENG Yutao;ZHANG Bing;ZHOU Chong;ZHU Enyi;SUN Jiaming(College of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2022年第S01期147-154,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51978332,51608263)
关键词
GFRP管混凝土
椭圆形截面
型钢
拟静力试验
抗震性能
GFRP-confined concrete
elliptical cross-section
profiled-steel
quasi-static test
seismic behavior
作者简介
彭宇韬,出生于1996年,男,博士研究生,主要从事新材料与新结构方面的研究。email:pyt_1114@163.com;通信作者:张冰,出生于1985年,男,工学博士,副教授,主要从事新材料与新结构方面的研究。email:zhangbing2003@hit.edu.cn
