大型空冷岛平台结构防屈曲支撑消能减震设计方案研究  

Study of design scheme of buckling resistance braces at air cooling platform for energy dissipation and seismic resistance

作　　者：曹谦[1] 高向宇[1] 尹学军 陆国栋[3] 周建军[4] 

机构地区：[1]北京工业大学,北京100124 [2]青岛科而泰环境振动控制技术有限公司,山东青岛266061 [3]电力规划设计总院,北京100120 [4]华北电力设计院工程有限公司,北京100120

出　　处：《武汉大学学报（工学版）》2013年第S1期108-112,共5页Engineering Journal of Wuhan University

摘　　要：大型空冷岛平台结构通常采用大直径管柱排架式结构体系,其抗震防线较为单薄,结构质量大且沿高度分布不均匀,难以进一步提高侧移刚度及抗震性能,具有特殊性.建议采用大型防屈曲支撑将空冷平台结构设计为消能减震结构体系.用Sap2000软件进行建模分析,比较分析了加入防屈曲支撑前后空冷岛模型的模态、周期、内力等数据,并进行非线性推覆分析及时程分析,结果表明,该结构体系可明显改善空冷岛平台结构在中震和大震下的抗震性能.提出了加入防屈曲支撑后管柱结构设计的改进方案,兼顾性能和经济,使应用可行性大为增加.The large air cooling platform construction is a particular structure,which usually uses a framed bent system with large-diameter tubular columns.It has a poor anti seismic lines of defense system.Its mass is large but asymmetrical vertically.So it is hard to improve its lateral stiffness and aseismic behavior.This paper suggests that change the structure to an energy dissipation structure by using large buckling resistance braces(LBRB).The structure is modeled and analyzed by Sap2000,models with and without LBRBs are compared on modality,period and endogen force;and a nonlinear pushover and time-history analysis is carried out.The results show that this structure can improve the a seismic behavior of air cooled platform structure in fortification intensity and rare earthquake intensity.A further improved solution,that the reduction of the area of columns in BRB-added construction is proposed.This solution would balance behavior and economy,so that its feasibility is enhanced.

关 键 词：空冷平台 防屈曲支撑 抗震设计 

分 类 号：TU352.11[建筑科学—结构工程]