考虑模态侧向力组合的结构抗震性能评估方法  

SEISMIC PERFORMANCE EVALUATION OF STRUCTURES CONSIDERING THE COMBINATION OF MODAL LATERAL FORCES FOR PUSHOVER ANALYSIS

作　　者：白久林[1] 欧进萍[1,2] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090

出　　处：《工程力学》2016年第4期58-66,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51261120376);国家自然科学基金重大研究计划项目(91315301);教育部博士研究生学术新人奖项目(2012)

摘　　要：结构在地震作用下的振动是结构各阶模态共同参与的结果。该文在已有研究基础上发展了考虑结构模态侧向力组合的静力弹塑性分析方法。采用模态贡献修正系数作为各阶模态参与的权重,考虑模态侧向力的方向,构造了基于模态侧向力组合的推覆分析侧向力模式,将各侧力模式分析结果的包络值作为结构的抗震响应。以两个5层和12层的钢筋混凝土框架结构为例,研究了结构的能力曲线和目标位移处的楼层变形分布;分别采用能量方法和非弹性响应谱来构造结构的能力曲线和需求曲线,对比分析了结构的层间位移角和楼层侧向位移。结果表明:结构的能力曲线由四种组合侧力模式共同决定,性能点处的抗震响应由两种组合侧力模式控制;该文方法能较好的预测结构的抗震响应,比常规的侧向力模式精度更高。The structural vibration induced by earthquakes is contributed by all modal responses. In the present study, a pushover analysis procedure was developed by considering the combination of modal lateral forces based on existing researches. Using the modal contribution factor to weigh the relative participation of each mode and considering the direction of modal forces, lateral force patterns were constructed based on the combination of modal forces, and the envelope of all load patterns was used as the seismic response. For the cases of 5-story and 12-story moment resisting frames, the capacity curves of structures and floor lateral displacement profiles were obtained. Using energy approach and inelastic response spectrum to construct the capacity curve and demand curve of structures, respectively, the paper assessed and compared the inter-story drift ratio and floor lateral displacements. The results indicate that capacity curves were jointly determined by four load patterns while the seismic response for performance point was determined by two load patterns. It also demonstrates that the present approach can predict the seismic response effectively and achieves a better result than common lateral patterns.

关 键 词：模态侧向力组合 推覆分析 抗震性能 响应包络值 RC框架结构 

分 类 号：TU375.4[建筑科学—结构工程] TU352.11