不同支撑体系对钢框架抗震性能的影响分析
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摘要
带支撑的钢框架结构是小高层建筑中常见的一种抗侧力体系。针对一幢12层的钢框架结构,利用PKPM软件设计了具有X型、V型和人字型3种不同支撑形式的结构体系,提供了主要构件的尺寸和结构的振动特性,然后利用有限元软件SAP 2000建立了3种支撑形式的三维有限元分析模型,进行了多遇和罕遇地震作用下的反应谱分析和Pushover的弹塑性分析,探讨了不同支撑形式对该结构动力特性和地震响应的影响。分析结果表明,3种支撑形式对结构刚度提高的效果比较接近,而V型和人字型的计算结果基本一致,小高层钢框架结构通过设置支撑体系,能够保证结构满足多遇和罕遇地震作用下我国抗震设计规范的要求,分析结果可供工程设计人员在结构选型时参考。
In order to analyse dynamic characteristics of steel frame with different patterns brace,three structures with brace of X,V and inverted V patterns were designed utilizing PKPM software,respectively.Sizes of main members and dynamic characteristics are provided.Based on structural design,three dimension models for different brace patterns were made using SAP 2000.Response spectrum analysis and pushover under frequent and rare earthquakes have been conducted in order to investigate the effects exerted from different patterns brace on structural stiffness.Results showed that three differenr braces play an important role in strengthening structural stiffness.Braces with V and inverted V patterns have approximate properties.The story drift ratio and the overall torsion of three different braces met the requirements regulated by Chinese design codes.Conclusions might be useful in practical engineering design during structural system selection.
In order to analyse dynamic characteristics of steel frame with different patterns brace,three structures with brace of X,V and inverted V patterns were designed utilizing PKPM software,respectively.Sizes of main members and dynamic characteristics are provided.Based on structural design,three dimension models for different brace patterns were made using SAP 2000.Response spectrum analysis and pushover under frequent and rare earthquakes have been conducted in order to investigate the effects exerted from different patterns brace on structural stiffness.Results showed that three differenr braces play an important role in strengthening structural stiffness.Braces with V and inverted V patterns have approximate properties.The story drift ratio and the overall torsion of three different braces met the requirements regulated by Chinese design codes.Conclusions might be useful in practical engineering design during structural system selection.
引文
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[3]Kim S E,Chen W F.Practical Advanced Analysis for UnbracedSteel Frame Design[J].Structural Engineering,1996,122(11):1259-1265.
[4]Dhillon B S,Abdel-Majid S.Interactive Analysis and Design ofFlexibly Connected Frames[J].Computers and Structures,1990,36(2):189-202.
[5]北京金土木软件技术有限公司.SAP2000中文版使用指南[M].北京:人民交通出版社,2006.
[6]舒赣平,孟宪德,陈绍礼.钢框架的高等分析与设计[J].建筑结构学报,2005,26(1):51-59.
[7]GB 50011-2001建筑抗震设计规范[S].
[8]刘小强,吴惠弼.高层钢框架的非线性分析模型[J].工程力学,1993,10(4):42-51.
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