冻融多龄期钢筋混凝土框架地震易损性分析  

Seismic Fragility Analysis of Multiage Reinforced Concrete Frame under Freeze-Thaw

作　　者：王斌[1] 吕斌 汪锋[2] 郑山锁[2] 

机构地区：[1]西安工业大学建筑工程学院,西安710021 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《西安工业大学学报》2017年第10期736-741,共6页Journal of Xi’an Technological University

基　　金：教育部高等学校博士学科点专项科研基金项目(20136120110003);陕西省教育厅科研计划项目(15JK1357)

摘　　要：为研究冻融损伤后钢筋混凝土(Reinforcement Concrete,RC)框架结构的地震易损性,基于混凝土冻融试验,建立了混凝土冻融损伤模型.考虑建筑龄期的影响,设计了一栋3跨5层RC框架结构,基于有限元分析平台,通过输入22条不同记录的地震运动进行结构易损性分析,得到了不同龄期下的结构易损性.研究结果表明:地震作用下非倒塌破坏的概率将随着龄期的增加而增大;在干燥环境下,冻融循环次数的不断增加对结构损伤有一定程度的影响,但影响不大,为地震作用下冻融环境中框架结构损失评估提供参考.To research the seismic fragility of reinforcement concrete （RC） frame structures with freeze -thaw damage,based on the freeze-thaw test of concrete,the freeze-thaw damage model of concrete was established. A five story and three span RC frame structure was designed,and the finite element models were also constructed using finite element program at different age of RC frame structures. With the program and 22 seismic ground motion records, seismic fragility analysis was carried out and fragility was derived for different age of RC frames. Meanwhile,the performance of fragility was compared for the two different age RC structures. The study results showed： The un-collapse probability of structure was increase with the increase of age of structures under the earthquake; Meanwhile, the structure damage was affected to some extent by the increase of the number of freeze-thaw cycle under the dry environment,but not very seriously. The study results provide reference for seismic risk evaluation of existing RC structures under freeze-thaw environment.

关 键 词：钢筋混凝土框架 冻融损伤模型 多龄期 地震易损性 

分 类 号：TU375.4[建筑科学—结构工程]