凯威特型单层球面网壳在强震下的失效研究
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摘要
动力强度破坏是网壳结构在遭受地震时的主要失效形式,准确的失效判别需要以基于材料损伤理论的分析为基础。为在动力时程分析中考虑材料损伤累积的因素,编制了基于有限元软件ABAQUS的用户材料子程序,具有较高的计算精度和较好的收敛性,实现了网壳结构考虑材料损伤的动力有限元分析。对单层球面网壳在强震下的失效特点进行了系统的参数研究,探讨了考虑材料损伤因素对网壳失效特征的影响;综合网壳失效时刻的多项特征响应,拟合了能够评估网壳动力损伤程度的损伤模型;基于损伤模型表示的网壳极限状态的物理意义,建立了适用于跨度40m的凯威特单层球面网壳强震失效判别准则,可用之判定网壳在强震作用下的失效极限荷载。
The dynamic strength failure is the main seismic failure mode of single-layer reticulated shells, and the prediction of failure load requires the consideration of material damage cumulation. A material subroutine in the platform of ABAQUS is developed for analyzing reticulated shells subjected to dynamic loads considering damage cumulation. Then, the failure behavior of single-layer reticulated domes under severe earthquakes is investigated, and the effect of damage cumulation is discussed. According to characteristic responses of single-layer reticulated domes at the failure state, the explicit definitions of failure states are established, and the strength failure criterion is proposed.
The dynamic strength failure is the main seismic failure mode of single-layer reticulated shells, and the prediction of failure load requires the consideration of material damage cumulation. A material subroutine in the platform of ABAQUS is developed for analyzing reticulated shells subjected to dynamic loads considering damage cumulation. Then, the failure behavior of single-layer reticulated domes under severe earthquakes is investigated, and the effect of damage cumulation is discussed. According to characteristic responses of single-layer reticulated domes at the failure state, the explicit definitions of failure states are established, and the strength failure criterion is proposed.
引文
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[2]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB5001-2001,Code for seismic design of buildings[S].Beijing:China Architecture Industry Press,2001.(in Chinese)
[3]JGJ61-2003,网壳结构技术规程[S].北京:中国建筑工业出版社,2003.JGJ61-2003,Technical specification for latticed shells[S].Beijing:China Architecture Industry Press,2003.(in Chinese)
[4]叶继红.单层网壳结构的动力稳定性[D].上海:同济大学,1995.Ye Jihong.The dynamic stability of single-layer reticular shells[D].Shanghai:Tongji University,1995.(in Chinese)
[5]Shiro Kato,Takashi Ueki,Yoichi Mukaiyama.Study of dynamic collapse of single layer reticular domes subjected to earthquake motion and the estimation of statically equivalent seismic forces[J].International Journal of Space Structures,1997(3/4):191―204.
[6]Koichiro Ishikawa,Shiro Kato.Elastic-plastic dynamic buckling analysis of reticular domes subjected to earthquake motion[J].International Journal of Space Structures,1997(3/4):205―215.
[7]Shen Shizhao.The dynamic stability problem of reticular shells[C].Invited Lecture,IASS-APCS Symposium,Taibei,China,2003:44―46.
[8]郭海山,沈世钊.单层网壳结构动力稳定性分析方法[J].建筑结构学报,2003,24(3):1―9.Guo Haishan,Shen Shizhao.Analysis method of dynamic stability of single-layer reticulated domes[J].Journal of Building Structures,2003,24(3):1―9.(in Chinese)
[9]Fan F,Shen S Z.Study on the dynamic strength failure of reticulated domes under severe earthquakes[C].International Association for Shell and Spatial Structures Symposium.Montpellier,France,2004:140―141.
[10]沈世钊,支旭东.球面网壳在强震下的失效机理[J].土木工程学报,2005,38(1):11―20.Shen Shizhao,Zhi Xudong.Failure mechanism of reticular shells subjected to dynamic actions[J].China Civil Engineering Journal,2005,38(1):11―20.(in Chinese)
[11]董宝,沈祖炎,孙飞飞.考虑损伤累积影响的钢柱空间滞回过程的仿真[J].同济大学学报,1999,27(1):11―15.Dong Bao,Shen Zuyan,Sun Feifei.Simulation of spatial hysteretic behavior of steel columns considering effects of damage accumulation[J].Journal of Tongji University,1999,27(1):11―15.(in Chinese)
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