耗能腋撑对钢筋混凝土框架抗震加固性能分析  

Analyses of seismic retrofitting performances of reinforced concrete frame with energy dissipation haunch braces

作　　者：吴轶[1] 何铭基[1] 郑俊光[1] 刘爱荣[1] 邓雪松[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《广西大学学报（自然科学版）》2009年第6期725-730,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(56078040);广东省自然科学基金资助项目(8151009101000010);广东省自然科学基金研究团队项目(8351009101000001);建设部项目(2009-2K-36)

摘　　要：为了减小强烈地震作用下钢筋混凝土框架梁柱节点的损伤破坏,在不影响建筑使用空间的前提下,提出在梁柱节点区附近设置耗能腋撑,改善框架结构的抗震性能。以一榀普通单层钢筋混凝土框架结构为研究对象,耗能腋撑采用防屈曲支撑,对框架结构进行低周反复数值模拟试验研究,并变化耗能腋撑布置方式,研究耗能腋撑对框架抗震性能影响。计算结果表明,带耗能腋撑框架滞回曲线饱满,框架结构的强度与刚度退化得到减缓,延性系数提高了53%;随着耗能腋撑与梁端距离或夹角的增大,框架结构的初始刚度与承载力均得到提高,两者分别提高了48%和39%,其延性系数最大可达到8.66;而耗能腋撑与梁的夹角对框架结构的刚度退化系数影响并不显著。耗能腋撑有效地改善了钢筋混凝土框架的抗震性能。To decrease the damage and fracture of reinforced concrete beam-column joint under strong earthquake, energy dissipation haunch braces （EDHB） were proposed to be installed to improve the seismic performance of reinforced concrete （RC） frame without violating floor usage. A single-story reinforced concrete frame equipped with buckling restrained braces was selected, and numerical simulation investigations of the RC frame subjected to low cyclic loading were carried out and the effects of different arrangement of EDHBs on the seismic performances of the frame were studied. Results show that the hysteretic curves of the frame with EDHBs is plump, strength and stiffness degradation are alleviated, and the ductility coefficient can be increased 53% ; with the increase of the distance or the angle between EDHBs and the beam, the initial stiffness and bearing capacity of the frame can be enhanced 48% and 39% , the ductility coefficient maximally reaches 8.66, and the stiffness degradation of the frame can be influenced insignificantly by the angle between EDHBs and the beam. The seismic performances of the RC frame are improved effectively by EDHBs.

关 键 词：钢筋混凝土框架 耗能腋撑 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程]