摘要
该文提出了一种角部螺旋箍筋约束的新型空腔式钢筋混凝土框架柱。为了验证上述新型构造的合理性和可靠性,明确该新型空腔式RC柱的抗震性能,设计了3个足尺空腔柱和1个足尺实心柱试件,开展了低周反复荷载下的拟静力试验。对比分析了空腔柱和实心柱的破坏模式、承载能力、变形能力和耗能能力,探究了空腔率和轴力对空腔柱抗震性能的影响规律。结果表明:空腔柱中的螺旋箍筋对混凝土提供了强有效的约束,使得相同轴力作用下的空腔柱延性优于实心柱,同时承载力与实心柱相当;空腔率对空腔柱的破坏模式和抗震性能具有显著影响,低空腔率空腔柱试件和实心柱试件发生了弯曲破坏且延性较好,高空腔率试件发生了弯剪破坏且延性小于低空腔率试件;轴力对空腔柱的破坏模式和抗震性能存在一定影响,低轴力试件延性更好。该文的相关研究成果可为空腔式RC框架柱的进一步发展提供重要参考。
A new type of reinforced concrete frame hollow column with spiral hoops at section corners is proposed in this paper. To investigate the seismic performance of this hollow column, 3 full-scale specimens with hollow section and 1 full-scale solid column are designed and tested under pseudo-static load. The failure mode, load-bearing, deformation and energy dissipation capacities of hollow columns and solid column are compared and analyzed. The influence of hollow ratio and axial load on the seismic performance of hollow column are investigated. The results indicate that the spiral hoops provide strong confinement for the concrete. Hence, under an identical axial load, the ductility of hollow column is better than that of the solid column and the load-bearing capacities are approximately identical. Hollow ratio has significant influence on the failure mode and seismic performance of hollow columns. In comparison with the solid column, the hollow column with lower hollow ratio exhibits better ductility and flexural failure mode is also observed on it. In contrast, the hollow column with a higher hollow ratio exhibits worse ductility and flexure-shear failure occurs. The axial load also has some influence on the failure mode and seismic performance of hollow columns. The hollow column with a lower axial load shows better ductility. The research results provide useful reference for further development of the RC hollow column.
作者
杨参天
解琳琳
李爱群
陈越
YANG Can-tian;XIE Lin-lin;LI Ai-qun;CHEN Yue(Beijing advanced innovation center for future urban design,Beijing 100044,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing 100044,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)
出处
《工程力学》
EI
CSCD
北大核心
2019年第6期60-69,共10页
Engineering Mechanics
基金
国家重点研发计划项目(2017YFC0703600)
北京未来城市设计高精尖创新中心(UDC2016030200)
博士启动项目(KYJJ2017005)
关键词
角部螺旋箍筋
混凝土空腔柱
抗震性能
足尺试验
约束混凝土
spiral hoops at section corners
reinforced concrete hollow column
seismic performance
full-scale experiment
confined concrete
