钢管混凝土柱-钢梁多层平面框架倒塌分析研究
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摘要
该文建立了钢管混凝土柱-钢梁平面框架结构的有限元计算模型,探讨了该类组合框架的倒塌判断标准。基于构件拆除法对组合框架结构进行了计算,研究了倒塌工况下组合框架结构的变形和内力分布规律。结果表明:钢管混凝土柱-钢梁平面框架结构剩余变形主要集中在梁端。按照规范设计的组合框架在不考虑节点区破坏前提下满足抗倒塌要求,但节点区内力变化明显,成为倒塌设计中的关键部位之一。
A finite element analysis(FEA) model of CFST(concrete filled steel tube) column-steel beam planar frames is presented in this paper.The collapse criteria of this kind of planar frame is discussed.Alternate path method is used to simulate the collapse of the composite frame.The distribution of the deformation and internal force of the frames are analyzed.The results show that the deformation of the left frame structure mainly concentrates at the beam ends.The composite frame according to design codes can satisfy the requirement of collapse when the failure of joints is ignored.However,the forces increase significantly in the joints next to the lost column,which become one of key parts in the design considering collapse.
A finite element analysis(FEA) model of CFST(concrete filled steel tube) column-steel beam planar frames is presented in this paper.The collapse criteria of this kind of planar frame is discussed.Alternate path method is used to simulate the collapse of the composite frame.The distribution of the deformation and internal force of the frames are analyzed.The results show that the deformation of the left frame structure mainly concentrates at the beam ends.The composite frame according to design codes can satisfy the requirement of collapse when the failure of joints is ignored.However,the forces increase significantly in the joints next to the lost column,which become one of key parts in the design considering collapse.
引文
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[2]Fu F.Progressive collapse analysis of high-rise buildingwith 3-D finite element modeling method[J].Journal ofConstructional Steel Research,2009,65(6):1269―78.
[3]陆新征,李易,叶列平,马一飞,梁益.钢筋混凝土框架结构抗连续倒塌设计方法的研究[J].工程力学,2008,25(增刊II):150―157.Lu Xinzheng,Li Yi,Ye Lieping,Ma Yifei,Liang Yi.Study on design method to resist progressive collapse forreinforced concrete frames[J].Journal of EngineeringMechanics,2008,25(Suppl II):150―157.(in Chinese)
[4]United States General Services Administration(GSA).Progressive collapse analysis and design guidelines fornew federal office buildings and major modernizationprojects[S].Washington,D.C.,2003.
[5]Department of Defense(DoD).Unified Facilities Criteria(UFC):Design of structures to resist progressive collapse[S].Washington,D.C.,2010.
[6]韩林海,陶忠,王文达.现代组合结构和混合结构-试验、理论和方法[M].北京:科学出版社,2009.Han Linhai,Tao Zhong,Wang Wenda.Advancedcomposite mixed structures-testing,theory and designapproach[M].Beijing:China Science Press,2009.(inChinese)
[7]韩林海.钢管混凝土结构—理论与实践[M].第2版.北京:科学出版社,2007.Han Linhai.Concrete filled steel tubular structures[M].2nd ed.Beijing:China Science Press,2007.(Chinese)
[8]王先铁,郝际平,周观根,张耀,马尤苏夫.两层两跨方钢管混凝土框架抗震性能试验研究[J].地震工程与工程振动,2010,30(3):70―76.Wang Xiantie,Hao Ji’ping,Zhou Guan’gen,Zhang Yao,Ma Yousufu.Experimental research on seismic behaviorof two-story two-bay concrete filled square steel tubecolumns frame[J].Journal of Earthquake Engineeringand Engineering Vibration,2010,30(3):70―76.(inChinese)
[9]DBJ/T13-51-2010,钢-混凝土组合结构技术规程[S].福州:福建省建设厅,2010.DBJ/T 13-51-2010,Technical specification forconcrete-filled steel tubular structures[S].Fuzhou:TheConstruction Department of Fujian Province,2010.(inChinese)
[10]GB50017-2003,钢结构设计规范[S].北京:中国计划出版社,2003.GB 50017-2003,Code for design of steel structures[S].Beijing:China Planning Press,2003.(in Chinese)
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