RC框架核心筒结构的地震易损性研究  

Seismic fragility of RC frame-core wall structures

作　　者：郑山锁[1] 张艺欣 秦卿[1] 杨威[1] 甘传磊 左英[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《振动与冲击》2016年第23期106-113,共8页Journal of Vibration and Shock

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);陕西省科研项目(2013JC16;2014JQ7231)

摘　　要：为研究高层RC框架核心筒结构的地震易损性,设计9榀相同层高但不同跨度和地震设防烈度的典型结构模型。考虑地震动输入的不确定性,采用Perform-3D对其进行弹塑性动力时程分析得到结构地震响应,进而结合我国抗震规范对框架核心筒结构体系性能水平限值要求建立相应的地震易损性曲线,对比分析了不同跨度和设防烈度下结构的地震易损性差异;结果表明:较低设防烈度结构的地震易损性曲线差别不明显,而较高抗震设防烈度下结构的地震易损性曲线差别显著;在相同设防烈度下,随着结构跨度的增加其地震易损性曲线变化不大,从一个方面验证了结构设计的不确定性对其地震易损性的影响较小。研究为进行城市高层建筑结构的地震灾害损失评估提供了理论依据。In order to establish fragility curves of high-rise RC frame-core wall structures,nine typical RC frame-core wall structures with uniform story height,different spans and earthquake fortification intensity were designed and numerically modeled.Considering the randomness of earthquake ground motions input,their seismic responses were obtained through nonlinear dynamic time history analysis adopting the finite element software Perform-3D.Ultimate damage states of all structures were defined on the basis of current seismic design code to build the corresponding seismic fragility curves.The influences of structural span and seismic fortification intensity on structures＇seismic fragility were analyzed.The results showed that low seismic fortification intensity makes no obviuos differences among structure vulnerability curves,while with increase in the intensity,the differences become obvious;although spans are divers,the fragility curves are similar under the same seismic fortification intensity;so,the design uncertainties have smaller effects on structures＇seismis fragility.The results provided a reference for the seismic loss estimation of city high-rise buildings.

关 键 词：高层RC框架核心筒结构 易损性曲线 地震动输入 结构设计 

分 类 号：TU375[建筑科学—结构工程]