单层球面网壳结构抗连续倒塌设计
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摘要
单层球面网壳冗余度较低,个别杆件失效容易引起结构连续倒塌。为提高单层球面网壳的抗连续倒塌能力,可以采用将单层网壳主肋设计为局部双层的方法。应用ABAQUS软件通过自编程序,考虑杆件失稳及失稳后行为,对比分析了采用局部双层前、后静力荷载作用下单层球面网壳极限承载力、节点位移和失效模态,以及采用局部双层前、后地震荷载作用下单层球面网壳极限承载力。分析了地震作用下局部双层厚度不同时单层球面网壳结构的极限承载力。分析结果表明,将单层球面网壳主肋设计为局部双层可提高网壳结构极限承载力,改变网壳失效模式。
Since single-layer reticulated shell has low level of redundancy,progressive collapse may occur when single member fails.To prevent progressive collapse from happening,partial double-layer reticulated shell is adopted to improve the collapse-resisting capacity.In this paper,static analysis was carried out to analyze single-layer reticulated shell using ABAQUS,and the results of ultimate bearing capacity,node displacement and failure mode were compared to the results of partial double-layer shell.Also,dynamic analysis was conducted to compare the ultimate bearing capacity between single-layer and partial double-layer shells under strong earthquakes.The analysis results indicate that the method of designing partial double-layer shell can enhance the ultimate bearing capacity of the structure,and it can also change the failure mode of single-layer reticulated shells.
Since single-layer reticulated shell has low level of redundancy,progressive collapse may occur when single member fails.To prevent progressive collapse from happening,partial double-layer reticulated shell is adopted to improve the collapse-resisting capacity.In this paper,static analysis was carried out to analyze single-layer reticulated shell using ABAQUS,and the results of ultimate bearing capacity,node displacement and failure mode were compared to the results of partial double-layer shell.Also,dynamic analysis was conducted to compare the ultimate bearing capacity between single-layer and partial double-layer shells under strong earthquakes.The analysis results indicate that the method of designing partial double-layer shell can enhance the ultimate bearing capacity of the structure,and it can also change the failure mode of single-layer reticulated shells.
引文
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[12]ISO 10721-1 Steel Structure.Material and Design[S].Switzerland:European Committee for Standardization,1997
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[14]陆新征,叶列平,缪志伟,等.建筑抗震弹塑性分析———原理、模型与在ABAQUS,MSC.MARC和SAP2000上的实践[M].北京:中国建筑工业出版社,2009Lu Xinzheng,Ye Lieping,Miao Zhiwei,et al.Elasto-plastic analysis of buildings against earthquake—theory modal and implementation on ABAQUS,MSC,MARC and SAP2000[M].Beijing:China Architecture&Building Press,2009(in Chinese)
[2]于志伟,支旭东,范峰,等.K8型单层球面网壳支座减振[J].哈尔滨工业大学学报,2009,41(4):7-11Yu Zhiwei,Zhi Xudong,Fan Feng,et al.Seismic reduction of single-layer reticulated domes under earthquakes[J].Journal of Harbin Institute of Technology,2009,41(4):7-11(in Chinese)
[3]张毅刚,梁海彤.替换可控杆件的双层柱面网壳半主动控制策略[J].北京工业大学学报,2003,29(3):320-324Zhang Yigang,Liang Haitong.Semi-active control strategy of double layer cylindrical lattice shell replacing controllable chords[J].Journal of Beijing University of Technology.2003,29(3):320-324(in Chinese)
[4]杨飏,李友明,沈世钊,等.单层网壳结构阻尼减振控制分析[J].世界地震工程,2009,25(1):143-147Yang Yang,Li Youming,Shen Shizhao et al.Vibration control of single-layer lattice spherical shells with bar-type dampers[J].World Earthquake Engineering,2009,25(1):143-147(in Chinese)
[5]杜文风,高博青,董石麟.单层网壳动力失效的形式与特性研究[J].工程力学,2009,26(7):39-46,65Du Wenfeng,Gao Boqing,Dong Shilin.Study on types and characters of dynamical failure for single layer latticed shells[J].Engineering Mechanics,2009,26(7):39-46,65(in Chinese)
[6]曹正罡,陈肖达,范峰.均布荷载作用下单层球面网壳的弹塑性失稳模式研究[J].建筑钢结构进展,2011,13(6):19-23,30Cao Zhenggang,Chen Xiaoda,Fan Feng.Elasto-plastic instability mode of single-layer latticed domes under uniform load[J].Progress in Steel Building Structures,2011,13(6):19-23,30(in Chinese)
[7]沈世钊,支旭东.球面网壳在强震作用下的失效机理[J].土木工程学报,2005,38(1):11-20Shen Shizhao,Zhi Xudong.Failure mechanism of reticular shells subjected to dynamic actions[J].China Civil Engineering Journal,2005,38(1):11-20(in Chinese)
[8]丁阳,葛金刚,李忠献.考虑损伤累积及杆件失稳效应的网壳结构极限承载力分析[J].工程力学,2012,29(5):13-18Ding Yang,Ge Jingang,Li Zhongxian.Analysis on ultimate bearing capacity of reticulated shell considering cumulative damage and instability for member[J].Engineering Mechanics,2012,29(5):13-18(in Chinese)
[9]陈务军,付功义,龚景海,等.带肋局部双层网壳的失稳特征研究[J].工程力学,2002,19(4):61-66Chen Wujun,Fu Gongyi,Gong Jinghai,et al.Instability behavior of partial double-layer lattice-ribbed domes[J].Engineering Mechanics,2002,19(4):61-66(in Chinese)
[10]陈务军,董石麟,付功义,等.凯威特型局部双层网壳结构特性分析[J].空间结构,2001,7(1):25-33Chen Wujun,Dong Shilin,Fu Gongyi,et al.Structural analysis for partial double-layer Kiewitt domes[J].Spatial Structures,2001,7(1):25-33(in Chinese)
[11]陈务军,董石麟,付功义.大型局部双层网壳的体系及稳定性研究[J].建筑结构学报,2005,26(1):1-10Chen Wujun,Dong Shilin,Fu Gongyi.Structural formation and stability performance investigations of large partial double layer reticulated shell structures[J].Journal of Building Structures,2005,26(1):1-10(in Chinese)
[12]ISO 10721-1 Steel Structure.Material and Design[S].Switzerland:European Committee for Standardization,1997
[13]Marshall P W,Gates W E,Anagnostopoulos S.Inelastic dynamic analysis of tubular offshore structures[C]//Proceedings of Ninth Annual Offshore Technology Conference.Houston,U S A,1977:235-246
[14]陆新征,叶列平,缪志伟,等.建筑抗震弹塑性分析———原理、模型与在ABAQUS,MSC.MARC和SAP2000上的实践[M].北京:中国建筑工业出版社,2009Lu Xinzheng,Ye Lieping,Miao Zhiwei,et al.Elasto-plastic analysis of buildings against earthquake—theory modal and implementation on ABAQUS,MSC,MARC and SAP2000[M].Beijing:China Architecture&Building Press,2009(in Chinese)
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