支撑布置方式对不规则高层钢框架抗震的影响  

Influences of Seismic Behaviors of Irregular High-rise Steel Structures with Different Layout of Braces

作　　者：王兴国 肖亚明[1] WANG Xingguo;XIAO Yaming(School of Civil and Hydraulic Engineering,Hefei University of Technology,Heifei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《安徽建筑大学学报》2020年第3期20-25,共6页Journal of Anhui Jianzhu University

摘　　要：多高层钢结构常采用框架支撑体系,支撑的使用形式以及支撑的布置方式决定着结构各方面性能。对于不规则的高层钢结构,合理的布置支撑在节省钢材的同时可以提高钢框架的抗震能力,从而满足建筑的形态需求。建立9层的高层模型,采用Midas Gen进行反应谱分析和Pushover分析,对比多种支撑布置方案下结构的抗震性能。在分析计算的基础上探讨支撑布置的影响规律,为结构设计提供参考。结果表明:增加布置支撑的层数可使结构的抗侧刚度有较大提高,构件的挠度和应力比有所降低;采用偏心支撑,可以最大程度地减少结构成本,且结构耗能能力较强,延性好;采用跨层的K形支撑对结构的抗侧刚度提高显著,且在大震下结构抵抗地震作用的能力较强,构件的挠度和应力比较小。综合考虑多方面因素,将采用偏心支撑的方案确定为最佳方案。Multi-storey and high-rise steel structures usually adopt the braced frame system,the kind of brace and the layout of brace often play a decisive role in all respects performance of structures. For irregular high-rise steel structures,appropriate layout of brace not only can enhance the ability of the seismic performance of the high frame structures,but also can meet the requirements of shapes of the architecture. The model of high-rise building(9-storey)are set up,whose seismic properties are analyzed(including modal analysis,response spectrum analysis,pushover analysis) by finite element software Midas Gen. Comparing different seismic performance of schemes of layout of braces. On the basis of calculation and analysis,the influencing law of brace layout forms is also explored,so that it can provide a reference for the structure design. The results indicate that increase the layer of braces can enhance the lateral stiffness of the structure,and the deflection andstress ratio decrease;eccentrically brace can reduce cost of the structure,it can also dissipate energy better and its ductility is good.Under strong earthquake,cross-layer K shape braces can enhance the lateral stiffness of the structure observably,the structure’s ability of resisting earthquakes is brilliant and the deflection andstress ratio is small.Considering various factors,the scheme which adopt eccentrical brace is best.

关 键 词：支撑布置方式 不规则高层 抗震性能 

分 类 号：TU973.13[建筑科学—结构工程]