高强钢组合K形偏心支撑钢框架抗震性能研究  

Analysis of seismic performance of high strength steel composite K-eccentrically braced frames

作　　者：田小红[1] 苏明周[2] 李慎[3] 宋丹 TIAN Xiaohong;SU Mingzhou;LI Shen;SONG Dan(School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710048,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;Northwest Engineering Corporation Limited,Xi’an 710065,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,西安710048 [2]西安建筑科技大学土木工程学院,西安710055 [3]西安理工大学土木建筑工程学院,西安710048 [4]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《振动与冲击》2020年第12期95-102,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51178382)。

摘　　要：为了合理评估高强钢组合K形偏心支撑框架(K-HSS-EBFs)的抗震性能,设计了一个20层K-HSS-EBF结构,选取10条地震记录对其进行增量动力分析(IDA)。探讨了在强震作用下结构的薄弱部位、耗能梁塑性区的形成和发展、耗能梁变形和最大层间位移的关系,得到了结构概率分位值为10%、50%和90%的IDA曲线以及位移延性系数,结合定义的性能参数评估了结构的抗震性能。研究表明:随着峰值地震加速度的增加,各层耗能梁先后进入塑性,并逐渐发展,吸收地震能量;K-HSS-EBFs的易损曲线能很好地反映其抗震性能;按我国规范设计的高强钢组合K形偏心支撑框架偏保守,能承受远大于设防烈度的地震作用,造成结构设计的浪费。To evaluate the seismic performance of high-strength steel composite eccentrically braced frames(K-HSS-EBFs),a 20-story K-HSS-EBF was designed,and Incremental dynamic analysis(IDA)was carried out with 10 seismic ground motions.The weak parts of the structure,the formation and development of the plastic zones of the link and the relationship between deformation of link and maximum story drift under the action of strong earthquakes were investigated.The IDA curves of 10%,50%,and 90%fractiles and the displacement ductility coefficient were obtained.The seismic performance was assessed by combining the defined performance parameters.The results show that with the increase in the peak ground acceleration,the links successively entered the plastic state and absorbed the seismic energy.The collapse fragility curve can reflect the seismic performance of the K-HSS-EBFs.The K-HSS-EBFs designed according to the current code have negligible risk of collapse and high security reserve,which is more conserved and leads to cost waste.

关 键 词：高强钢 偏心支撑 增量动力分析 抗震性能 层间侧移角 

分 类 号：TU391[建筑科学—结构工程]