钢塔架连续倒塌动力响应的仿真分析
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摘要
偶然荷载作用下,钢塔架连续倒塌是近年来钢结构领域研究的热点问题。通过采用显式动力分析方法对钢塔架的连续倒塌过程进行了数值模拟分析,考察关键杆件失效时的位移及结构倒塌过程中能量随时间的变化规律,再现钢塔架发生连续倒塌的动力过程,揭示了钢塔架倒塌的破坏机制。基于数值模拟分析结果,给出了不同杆件失效时位移-时间曲线与结构倒塌过程中能量-时间曲线,通过对比分析,给出了相关设计建议:在输电塔塔架结构设计时,应加强主杆件的设计,同时应避免截面突变,以提高结构的抗连续倒塌能力。
In recent years,progressive collapse of steel towers caused by accidental loads is a hot issue in the field of steel structures. In the paper,the progressive collapse process of steel tower was numerically simulated by explicit dynamic analysis. The displacement of failed key members and the energy variation with time in the collapse process were investigated. The dynamic process of progressive collapse of steel tower was reproduced,and the failure mechanism of steel tower collapse was revealed. Based on the results of numerical simulation,the paper showed the displacement-time curves and the energy-time curves in the collapse process of different member failure. Through the comparative analysis,some design suggestions were given: in the design of transmission tower structure,in order to improve the anti-progressive collapse capacity of the structure,the main bar should be strengthened and the sudden change of section should be avoided.
In recent years,progressive collapse of steel towers caused by accidental loads is a hot issue in the field of steel structures. In the paper,the progressive collapse process of steel tower was numerically simulated by explicit dynamic analysis. The displacement of failed key members and the energy variation with time in the collapse process were investigated. The dynamic process of progressive collapse of steel tower was reproduced,and the failure mechanism of steel tower collapse was revealed. Based on the results of numerical simulation,the paper showed the displacement-time curves and the energy-time curves in the collapse process of different member failure. Through the comparative analysis,some design suggestions were given: in the design of transmission tower structure,in order to improve the anti-progressive collapse capacity of the structure,the main bar should be strengthened and the sudden change of section should be avoided.
引文
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[15]PANDEY P C,BARAI S V.Structural Sensitivity as a Measure of Redundancy[J].Journal of Structural Engineering,1997,123(3):360-364.
[2]中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010-2010[S].北京:中国建筑工业出版社,2015.
[3]BSI.Structural Use of Steelwork in Building:Code of Practice for Design:Rolled and Welded Sections:BS 5950-1∶2000[S].London:British Standards Institution,2000.
[4]CEN.Eurocode 1-Actions on Structures.Part 1-7:General Actions-Accidental Actions:EN 1991-1-7[S].Brussels:European Committee for Standardization,2005.
[5]DOD.Unified Facilities Criteria,Design of Building to Resist Progressive Collapse[S].Washington D.C.:Department of Defense,2009.
[6]General Service Administ ration.Progressive Collapse Analysis and Design Guidelines for New Federal Office Building and Major Modernization Project:GSA 2003[S].US:General Service Administration,2003.
[7]范圣刚,刘杰,刘美景.基于钢塔架敏感性的连续倒塌分析与数值模拟[J].工程力学,2013,30(4):322-330.
[8]中华人民共和国国家经济贸易委员会.110~500 kV架空送电线路设计技术规程:DL/T 5092-1999[S].北京:中国电力出版社,1999.
[9]中华人民共和国住房和城乡建设部.建筑结构荷载规范:GB50009-2012[S].北京:中国建筑工业出版社,2012.
[10]中华人民共和国住房和城乡建设部.钢结构设计标准:GB50017-2017[S].北京:中国建筑工业出版社,2017.
[11]谢甫哲,舒赣平,风俊敏.基于抽柱法的钢框架连续倒塌分析[J].东南大学学报,2010,40(1):154-159.
[12]胡晓斌,钱稼茹.多层平面钢框架连续倒塌仿真分析[J].力学与实践,2008,30(4):54-57.
[13]李艳.空间钢框架连续倒塌动力响应仿真分析[D].南宁:广西大学,2008.
[14]BYFIELD M,PARAMASIVAM S.Catenary Action in SteelFramed Buildings[J].Structures&Buildings,2007,160:247-257.
[15]PANDEY P C,BARAI S V.Structural Sensitivity as a Measure of Redundancy[J].Journal of Structural Engineering,1997,123(3):360-364.