最不利主余震序列型地震动作用下RC框架结构易损性研究  

Fragility analysis for RC frame structure under the most unfavorable mainshock-aftershock sequence-type ground motions

作　　者：张宁[1] 何宝明[1] 米力[1] 李治国[2] ZHANG Ning;HE Baoming;MI Li;LI Zhiguo(Ordos Vocational College, Ordos 017000, China;Traffic in Ordos City Construction Project Engineering Quality Supervision Bureau, Ordos 017000, China)

机构地区：[1]鄂尔多斯职业学院,内蒙古鄂尔多斯017000 [2]鄂尔多斯市交通建设工程质量监督局,内蒙古鄂尔多斯017000

出　　处：《世界地震工程》2018年第2期181-189,共9页World Earthquake Engineering

摘　　要：余震的发生会造成结构的累积损伤,不同类型的主余震序列地震动对结构的影响有所差异。鉴于此,以主震卓越周期小于或接近余震卓越周期为基本原则,确定了最不利主余震序列地震动。选择4层RC框架结构为研究对象,在增量动力分析的基础上,定义了4个性能水平,以此来研究该结构的易损性。依据破坏状态概率和震害指数,得到7度多遇、7度设防和7度罕遇地震的易损性指数。研究结果表明:依据我国规范设计的RC框架结构的4个性能水平的量化指标限值依次为1/495、1/263、1/108和1/45,余震的出现会加剧结构的破坏状态。当以易损性指数作为评价指标时,可认为该结构能够满足小震不坏、中震可修和大震不倒的抗震设防目标。The occurrence of aftershocks can cause cumulative damage to structure, and the influence of different mainshock-aftershock sequence-type ground motions is different. In this paper, the most unfavorable mainshockaftershoek sequence ground motions are determined based on the principle that the predominant period of mainshock is less than or close to the predominant period of aftershock. The four-story RC frame structure was selected as the research object. Based on the incremental dynamic analysis, four performance levels were defined to study seismic vulnerability of the structure. According to the damage state probability and earthquake damage index, vulnerability indices of 7 degree frequently earthquake, 7 degree fortification earthquake and 7 degree rarely earthquake were obtained. Results show that the four performance levels quantification index limits of the RC frame structure designed according to current codes are 1/495, 1/263, 1/108, 1/45, the emergence of aftershocks can exacerbate the destruction of structure. When the vulnerability index is designed an evaluation index, the structure can satisfy seismic fortification target of ＂no damage under frequent earthquake＂, ＂no unrepairable damage under design-based earthquake＂, ＂no collapse under maximum consider earthquake＂ under the most unfavorable mainshock-aftershock sequence ground motions.

关 键 词：最不利主余震序列 RC框架结构 增量动力分析 失效概率 易损性指数 

分 类 号：P315.9[天文地球—地震学]