设计因素对RC框架结构地震易损性的影响  

Influence of Design Factors on Seismic Fragility of RC Frame Structures

作　　者：郑捷[1] 左河山 李文博[1] 雷振东[1] 郑山锁[1] 

机构地区：[1]西安建筑科技大学建筑设计研究院,陕西西安710055

出　　处：《地震工程学报》2016年第4期491-497,524,共8页China Earthquake Engineering Journal

基　　金：国家科技支撑计划(2013BAJ08B03);教育部高等学校博士学科点专项科研基金(20136120110003)

摘　　要：考虑到结构抵抗地震作用的机制为结构和地震动的不确定性与非线性相互耦合的过程,采用增量动力分析(IDA)考虑地震动的不确定性,选取16条地震动记录,基于OpenSEES的有限元建模理论对13榀平面RC框架结构进行基于IDA方法的地震易损性分析,分别讨论轴压比、高宽比、混凝土强度以及纵筋强度等结构参数对RC框架结构抗震性能的影响。结果表明:柱轴压比对结构抗震性能的影响显著,而高宽比对结构抗震性能的影响不明显;在保证柱轴压比相近的前提下,提高柱混凝土强度能够提升结构的抗震性能;相同地震作用下梁柱配置纵筋强度较高的框架结构达到立即使用(IO)状态和生命安全(LS)状态的概率较配置纵筋强度较低的大,配置纵筋强度较高的框架结构较配置纵筋强度较低的表现出更好的抗倒塌能力。The seismic resistance of structures involves uncertainty regarding the structure and the earthquake,and is coupled with non-linear variables.This paper employs Incremental Dynamic Analysis（IDA）to analyze the earthquake uncertainties.Based on OpenSEES finite element modeling theory,16 ground motion records were selected.After a discussion on the seismic vulnerability of 13 plane frame structures,this paper clarifies the influence of 4parameters on the seismic resistance levels that RC frame structures can attain.These parameters are axial compression ratio,height-width ratio,concrete strength,and longitudinal reinforcement strength.The results show that RC frame constructions,which are designed in strict accordance with current specifications,can meet the target of ＂ no collapse in a large earthquake＂;the influence of the height-width ratio on seismic resistance is not obvious;on the premise of similar axial compression ratios,increase in concrete strength can improve the seismic resistance of structures.Under the same earthquake,for structures with high beam-column longitudinal reinforcement strength,the probability of reaching the immediate occupancy and life safe states is larger than that of structures with low beam-column longitudinal reinforcement strength,but the latter show better collapse resistance.

关 键 词：RC框架结构 轴压比 地震易损性 抗倒塌能力 

分 类 号：TU375[建筑科学—结构工程]