防屈曲支撑作为可替换耗能元件抗震性能试验研究  

Experimental study on seismic performance of replaceable buckling-restrained braces in reinforced concrete frame

作　　者：吴徽[1] 张艳霞[1] 张国伟[1] 张扬[1] 赵健[1] 

机构地区：[1]北京建筑大学"工程结构与新材料"北京高等学校工程研究中心,北京100044

出　　处：《土木工程学报》2013年第11期29-36,共8页China Civil Engineering Journal

基　　金：住房和城乡建设部科技项目(2008-K2-17);北京市住建委科技项目(BJJQ-2010-169-01);北京市属高校创新团队建设与教师职业发展计划项目(IDHT20130512)

摘　　要：防屈曲支撑作为一种可替换耗能元件是框架结构在地震作用时的主要抗侧力和耗能单元,可以保护结构在地震作用下免受较大的损伤。为研究地震作用下可替换防屈曲支撑加固结构的抗震性能,对一个两榀两层三跨的防屈曲支撑RC框架模型进行了低周往复试验。试验和分析结果表明:由于防屈曲支撑的存在,框架结构在大震后仍具有很好的承载能力。将防屈曲支撑替换,对框架结构和受到损伤的防屈曲支撑分别进行拟静力试验,对比分析防屈曲支撑更换前后结构的抗震性能和震后防屈曲支撑的损伤。研究表明:两次低周往复试验中,防屈曲支撑都先于混凝土框架发生屈服并耗散大部分地震能量,提高了RC框架结构的抗震性能;将损伤后的防屈曲支撑更换,可使结构重新获得良好的抗震性能,迅速恢复结构的使用功能。As one type of replaceable energy dissipation components, the buckling-restrained brace provides the lateral force resistance and energy dissipation under earthquake actions and prevent the main structures from serious damage due to the earthquakes. To investigate the seismic performance of RC frame structure reinforced with replaceable buckling- restrained braces, a low-cycle test was carried out on a three-span structure model. It showed that the model structure still possessed a good bearing capacity even after the major earthquake. In a comparison, the quasi-static loading tests were conducted on the frame structure with removed braces and the damaged buckling-restrained braces, respectively, for their seismic performances. Test results showed that both two groups of buckling-restrained braces yielded prior to the other elements of the model structure since they absorbed most of seismic energy during the tests, indicating that they may improve the seismic performance of RC frame structures. Structures reinforced with replaced buckling-restrained braces could recover their seismic performance and be reused.

关 键 词：防屈曲支撑 可替换耗能元件 耗能 混凝土框架 

分 类 号：TU375.4[建筑科学—结构工程]