- 摘 要
-
（1 廣西大學土木建筑工程學院， 南寧 530004； 2 桂林理工大學土木與建筑工程學院， 桂林 541004；3 桂林理工大學博文管理學院， 桂林 541006）
［摘要］為了研究多層屈曲約束支撐鋼框架（BRBF）動力響應機理，采用國際上最常見的BRBF結(jié)構(gòu)形式為研究對象，以屈曲約束支撐BRB水平力分擔率β為主要研究參數(shù)，進行彈塑性動力二階非線性分析，探討了層損傷分布機理以及構(gòu)件持有性能。結(jié)果表明：不同地震波的彈性體系能量譜曲線和結(jié)構(gòu)基本周期對應關系影響多層BRBF結(jié)構(gòu)的最大層間位移反應值和BRB的層最大延性比值；地震波加速度時程的隨機性對多層BRBF結(jié)構(gòu)動力損傷分布影響明顯，尤其多層BRBF結(jié)構(gòu)抗震設計時有必要考慮地震動瞬時能量影響；BRB對結(jié)構(gòu)減震效果明顯，隨著BRB水平力分擔率β值的增加，BRB最大延性比以及最大累積塑性延性比有相應減小的趨勢。
［關鍵詞］鋼框架； BRB水平力分擔率； 層塑性損傷； 構(gòu)件塑性損傷
中圖分類號：TU973-13, TU973-31文獻標識碼：A文章編號：1002-848X(2016)24-0095-06
Dynamic response mechanism analysis of multi-story buckling-restrained braced steel frame
Chen Yihu1,2,3, Sun Lingyun3, Zhao Yanlin1, Bao Enhe2， Jin Lingzhi2
(1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2 College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China; 3 Bowen College of Management, Guilin University of Technology, Guilin 541006, China)
Abstract:To study the dynamic response mechanism of multi-story buckling-restrained braced steel frame (BRBF), the most commonly used BRBF structural type was adopted as study object and average horizontal force sharing ratio β of buckling-restrained brace (BRB) was taken as the main study parameter to carry out second-order nonlinear elastic-plastic dynamic analysis to explore the story damage distribution mechanisms and the structural member performances. The research results are as follows. The corresponding relations between elastic system energy spectrum of different earthquake waves and structural fundamental period effect maximum inter-story drift response value of multi-story BRBF and maximum story ductility ratio of BRB. The randomness of seismic acceleration time-history response affects obviously the structural dynamic damage distribution of multi-story BRBF, so it′s particularly necessary to consider the seismic instantaneous energy response on the multi-layer BRBF in the seismic design. BRB damping effect on the structure is obvious, and with the increasing of β value, BRB maximum story ductility ratio and maximum accumulated story ductility ratio have a decreasing trend.
Keywords:steel frame; BRB average horizontal force sharing ratio； story plastic damage; structural member plastic damage
*國家自然科學基金項目(51368013)，廣西自然科學回國基金項目（2011GXNSFC018004），廣西高等學?？茖W研究項目（KY2015YB505），廣西高等學校特色專業(yè)及課程一體化建設項目（GXTSZY232）。
通訊作者：孫凌云，碩士，Email:602767894@qq.com。
