基于增量动力分析的带耗能腋撑钢筋混凝土转换结构抗震性能评估  

Seismic performance of reinforced concrete transfer structure with energy dissipation haunch brace based on incremental dynamic analysis

作　　者：吴轶[1] 何铭基[1] 杨春[2,3] 张春梅[1] 周云[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]华南理工大学土木与交通学院,广东广州510640 [3]亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《地震工程与工程振动》2010年第5期72-79,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(56078040);广东省自然科学基金项目(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);中央高校基本科研业务费资助项目(20092M0230)

摘　　要：增量动力分析(IDA)是一种用于结构抗震性能评估的参数分析方法。通过分析IDA曲线,可更全面地了解结构的地震需求、刚度退化、强度退化与地震动强度的关系。基于转换结构抗震性能差的问题,在转换层处设置耗能腋撑,以普通和带耗能腋撑钢筋混凝土框架转换结构为研究对象,对其进行增量动力分析,评估普通与带耗能腋撑钢筋混凝土转换结构的抗震性能。分析表明,耗能腋撑能有效地降低转换层处的地震反应,不同工况下的最大层间位移角减幅为20%～60%,最大层间位移角均值曲线在转换层处的突变得到减缓。普通与带耗能腋撑钢筋混凝土框架转换结构对应"基本完好"和"防止倒塌"性能水准的层间位移角限值分别为1/850、1/100与1/720、1/80,均小于高规规定框架结构在相应性能水准下的层间位移角限值1/550和1/50。普通与带耗能腋撑钢筋混凝土框架转换结构无法满足"大震不倒"的要求,需要调整耗能腋撑的参数以满足规范要求。Incremental dynamic analysis（IDA） is a parametric analysis method to estimate the structural seismic performance.The relationship among earthquake motion intensity,structural seismic demand,stiffness and strength degradation can be more comprehensively understood by IDA curves.Energy dissipation haunch brace（EDHB） was proposed to be installed at the transfer story to improve the poor seismic performance of transfer structure.The seismic performance of reinforced concrete（RC） transfer frame structure with or without EDHB was evaluated by incremental dynamic analysis.Results show that the earthquake responses of RC transfer frame structures can be significantly decreased by EDHB.The maximum inter-story drift angle can be decreased 20%～60% under different ground motions,abrupt change of the average curves of maximum inter-story drift angle can be alleviated at the transfer story.The limits of elastic and elasto-plastic inter-story drift angle of transfer frame structure with or without EDHB,are 1/850,1/100 and 1/720,1/80 respectively corresponding to two performance levels ＂intact＂ and ＂collapse preventing＂,less than the limits of frame structure,1/550 and 1/50 defined in the specification of tall building.The requirement,preventing collapse,set down in the specification can not be satisfied for RC frame transfer structures with or without EDHB.The parameters of EDHB should be adjusted to meet the requirements of the specification.

关 键 词：耗能腋撑 钢筋混凝土转换结构 增量动力分析 抗震性能评估 

分 类 号：P315.95[天文地球—地震学] TU352.1[天文地球—固体地球物理学]