空间网格结构连续倒塌分析的瞬时移除构件法
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摘要
用于连续倒塌分析的多传递路径法忽略了构件失效的成因、机理和对剩余结构的动力效应,且需假定构件失效位置,不适用于杆件众多的空间网格结构.以损伤累积作为构件失效判别准则,考虑材料非线性和几何非线性,提出实时删除失效构件的瞬时移除构件法.采用动力非线性分析,对比双杆模型和悬臂梁节点位移,验证瞬时移除构件法的正确性.考虑杆件失稳和损伤累积对地震作用下单层柱面网壳进行连续倒塌分析,结果表明,瞬时移除构件法简单有效,可应用于空间网格结构连续倒塌分析.
Since alternate path method applied to progressive collapse neglected the cause and mechanism of compo-nent failure and structural dynamic effect caused by component failure,and needed to assume the position of compo-nent failure,it was not suitable for space grid structure with many members.Based on the cumulative damage as the criterion of component failure,instantaneous component-removing method considering geometric nonlinearity and material nonlinearity was proposed to remove disabled component.Dynamic nonlinearity analysis was applied to dou-ble members and cantilever,and the node displacements were compared to certify the correctness of instantaneous component-removing method.Considering cumulative damage and instability of member,progressive collapse of sin-gle-layer latticed cylindrical shell in an earthquake was analyzed.The analysis results indicate that instantaneous component-removing method is simple and useful,and can be used in the analysis of progressive collapse of space grid structure.
Since alternate path method applied to progressive collapse neglected the cause and mechanism of compo-nent failure and structural dynamic effect caused by component failure,and needed to assume the position of compo-nent failure,it was not suitable for space grid structure with many members.Based on the cumulative damage as the criterion of component failure,instantaneous component-removing method considering geometric nonlinearity and material nonlinearity was proposed to remove disabled component.Dynamic nonlinearity analysis was applied to dou-ble members and cantilever,and the node displacements were compared to certify the correctness of instantaneous component-removing method.Considering cumulative damage and instability of member,progressive collapse of sin-gle-layer latticed cylindrical shell in an earthquake was analyzed.The analysis results indicate that instantaneous component-removing method is simple and useful,and can be used in the analysis of progressive collapse of space grid structure.
引文
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[13]ISO10721-1 Steel Structure:Material and Design[S].1997.
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[2]British Standard Institute.Structural Use of Concrete:(Part 1):Code of Practice for Design and Construc-tion[S].1997.
[3]European Committee for Standardization.Eurocode 1:Actions on Structures[S].2002.
[4]Department of Defense.Design of Buildings to Resist Progressive Collapse[S].2005.
[5]陆新征,李易,叶列平,等.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,20082,5(SupplⅡ)1:50-157.Lu Xinzheng,Li Yi,Ye Liepinge,t al.Study on design method to resist progressive collapse for reinforced con-crete frames[J].Engineering Mechanics,2008,25(SupplⅡ)1:50-157(in Chinese).
[6]Nanci B,Shalva M.SDOF model for progressive collapse analysis[C]//New York:Structures,ASCE,2005:2243-2254.
[7]Sidney A G,Erber T,Stefanis Je,t al.Plastic collapse,shakedown and hysteresis of multistory steel struc-tures[J].Journal of Structural Engineering,1986,112(12)2:610-2627.
[8]Darwin D,Nmai C K.Energy dissipation in RC beams under cyclic load[J].Journal of Structural Engineering,19861,12(8):1829-1846.
[9]杜修力,欧进萍.建筑结构地震破坏评估模型[J].世界地震工程1,991(3):52-58.Du Xiuli,Ou Jinping.Evaluation model of earthquake damage for building[J].World Earthquake Engineering,1991(3)5:2-58(in Chinese).
[10]Shen Zuyan,Dong Bao.An experiment-based cumulative damage mechanics model of steel under cyclic load-ing[J].Advances in Structural Engineering1,9971,(1):39-46.
[11]宋振森.超高层钢结构考虑损伤和损伤累积分析方法[D].上海:同济大学土木工程学院2,004.Song Zhensen.Research on Analysis Methods for Super High-Rise Steel Structure Considering Damage Accumu-lation[D].Shanghai:College of Civil Engineering,Tongji University2,004(in Chinese).
[12]庄茁,张帆,岑松,等.ABAQUS非线性有限元分析实例[M].北京:科学出版社,2005.Zhuang Zhuo,Zhang Fan,Cen Songe,t al.Examples of Nonlinear Finite Element Analysis in ABAQUS[M].Bei-jing:Science Press,2005(in Chinese).
[13]ISO10721-1 Steel Structure:Material and Design[S].1997.
[14]Higginbotham A B,Hanson R H.Axial hysteretic behav-ior of steel members[J].Journal of the Structural Divi-sion,ASCE,1976,102(7):1365-1381.
[15]Marshall P W,Gates W E,Anagnostopoulos S.Inelastic dynamic analysis of tubular offshore structures[C]//Pro-ceedings of Ninth Annual Offshore Technology Confer-ence.Houston,USA,1977:235-246.
[16]中华人民共和国建设部.GB50011—2001建筑抗震设计规范[S].2001.Ministry of Construction of the People's Republic of China.GB50011—2001 Code for Seismic Design of Buildings[S].2001(in Chinese).
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