强震下单层球面网壳连续倒塌机理
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摘要
以单层凯威特球面网壳连续倒塌全过程非线性仿真计算为例,通过对地震过程中结构构件变形、受力、损伤等参量发展特征的研究分析,提出单层球面网壳连续倒塌过程可分为3个阶段,阐述了结构连续倒塌全过程的机理.分析不同地震峰值加速度条件下这3个阶段中结构重心竖向位移的变化特征,在此基础上,提出了适用于单层球面网壳结构的性态水平描述,并建立基于结构重心竖向相对位移的损伤评估指数.这些工作对于空间结构强震下灾变机理的进一步研究有较好的参考意义.
Based on nonlinear simulation of progressive collapse of single-layer Kiewitt spherical shell,this paper studies the characteristics of deformation,load-bearing,and damage development of members,and presents a theory called three-phase that explains the progressive collapse mechanism very well in detail.Then,the development of deformation during the three phases is analyzed under different peak ground accelonations(PGA) and thus a new description of behavior level of spherical shell is set up with a damage assessment index based on relative displacement of gravity.All the work is useful for further study on the catastrophic mechanism of space structure under severe earthquake.
Based on nonlinear simulation of progressive collapse of single-layer Kiewitt spherical shell,this paper studies the characteristics of deformation,load-bearing,and damage development of members,and presents a theory called three-phase that explains the progressive collapse mechanism very well in detail.Then,the development of deformation during the three phases is analyzed under different peak ground accelonations(PGA) and thus a new description of behavior level of spherical shell is set up with a damage assessment index based on relative displacement of gravity.All the work is useful for further study on the catastrophic mechanism of space structure under severe earthquake.
引文
[1]SHIMADA Y,MATSUOKA Y,YAMADA S,et al.Dynamic collapse test on 3-D steel frame model[C]∥The14th World Conference on Earthquake Engineering,Beijing,October 12-17,2008.
[2]TSITOS A,MOSQUEDA G,FILIATRAULT A,et al.Experimental investigation of progressive collapse of steelframes under multi-hazard extreme loading[C]∥The 14thWorld Conference on Earthquake Engineering,Beijing,October 12-17,2008.
[3]易建伟,何庆峰,肖岩,等.钢筋混凝土框架结构抗倒塌性能的试验研究[J].建筑结构学报,2007,28(5):104-117.YI Jian-wei,HE Qing-feng,XIAO Yan,et al.Collapseperformance of RC frame structure[J].Journal of BuildingStructures,2007,28:104-117.(in Chinese)
[4]周艳,张雷明,刘西拉.美国Cypress高架桥地震倒塌的仿真分析[J].岩石力学与工程学报,2005,24(17):3035-3044.ZHOU Yan,ZHANG Lei-ming,LIU Xi-la.Collapsesimulation and analysis of cypress viaduct during lomaprieta earthquake[J].Chinese Journal of Rock Mechanicsand Engineering,2005,24(17):3036-3044.(inChinese)
[5]顾祥林,印小晶,林峰,等.建筑结构倒塌过程模拟与防倒塌设计[J].建筑结构学报,2010,31(6):179-186.GU Xiang-lin,YIN Xiao-jing,LIN Feng,et al.Simulationof collapse process and design method to resist collapse forbuilding structures[J].Journal of Building Structure,2010,31(6):179-186.(in Chinese)
[6]KOICHIRO Ishikawa,SHOJI Okubo.Evaluation methodfor predicting dynamic collapse of double layer latticedspace truss structures due to earthquake motion[J].International Journal of Space Structures,2000,15(3):249-257.
[7]支旭东.单层网壳失效机理分析[D].哈尔滨:哈尔滨工业大学土木工程学院,2005.ZHI Xu-dong.Analysis on failure mechanism of single-layer latticed shell[D].Harbin:School of CivilEngineering,Harbin Institute of Technology,2005.(inChinese)
[8]沈祖炎,叶继红.运动稳定性理论在结构动力分析中的应用[J].工程力学,1997,14(3):21-28.SHEN Zu-yan,YE Ji-hong.Structural dynamic analysis bymotion stability theory[J].Engineer Mechanics,1997,14(3):21-28.(in Chinese)
[9]周海涛,张毅刚,吴金志.基于材料塑性损伤累积效应的梁单元数值模拟分析方法[J].空间结构,2010,16(3):13-17.ZHOU Hai-tao,ZHANG Yi-gang,WU Jin-zhi.Numericalsimulation method considering the cumulative effect ofplastic damage for beam element[J].Spatial Structures,2010,16(3):13-17.(in Chinese)
[10]CHOPRA A K.Dynamics of structure:theory andapplications to earthquake engineering[M].Beijing:Tingshua Pub,2005:171-174.
[11]谢礼立,马玉宏,翟长海.基于性态的抗震设防与设计地震动[M].北京:科学出版社,2009:37-38.
[2]TSITOS A,MOSQUEDA G,FILIATRAULT A,et al.Experimental investigation of progressive collapse of steelframes under multi-hazard extreme loading[C]∥The 14thWorld Conference on Earthquake Engineering,Beijing,October 12-17,2008.
[3]易建伟,何庆峰,肖岩,等.钢筋混凝土框架结构抗倒塌性能的试验研究[J].建筑结构学报,2007,28(5):104-117.YI Jian-wei,HE Qing-feng,XIAO Yan,et al.Collapseperformance of RC frame structure[J].Journal of BuildingStructures,2007,28:104-117.(in Chinese)
[4]周艳,张雷明,刘西拉.美国Cypress高架桥地震倒塌的仿真分析[J].岩石力学与工程学报,2005,24(17):3035-3044.ZHOU Yan,ZHANG Lei-ming,LIU Xi-la.Collapsesimulation and analysis of cypress viaduct during lomaprieta earthquake[J].Chinese Journal of Rock Mechanicsand Engineering,2005,24(17):3036-3044.(inChinese)
[5]顾祥林,印小晶,林峰,等.建筑结构倒塌过程模拟与防倒塌设计[J].建筑结构学报,2010,31(6):179-186.GU Xiang-lin,YIN Xiao-jing,LIN Feng,et al.Simulationof collapse process and design method to resist collapse forbuilding structures[J].Journal of Building Structure,2010,31(6):179-186.(in Chinese)
[6]KOICHIRO Ishikawa,SHOJI Okubo.Evaluation methodfor predicting dynamic collapse of double layer latticedspace truss structures due to earthquake motion[J].International Journal of Space Structures,2000,15(3):249-257.
[7]支旭东.单层网壳失效机理分析[D].哈尔滨:哈尔滨工业大学土木工程学院,2005.ZHI Xu-dong.Analysis on failure mechanism of single-layer latticed shell[D].Harbin:School of CivilEngineering,Harbin Institute of Technology,2005.(inChinese)
[8]沈祖炎,叶继红.运动稳定性理论在结构动力分析中的应用[J].工程力学,1997,14(3):21-28.SHEN Zu-yan,YE Ji-hong.Structural dynamic analysis bymotion stability theory[J].Engineer Mechanics,1997,14(3):21-28.(in Chinese)
[9]周海涛,张毅刚,吴金志.基于材料塑性损伤累积效应的梁单元数值模拟分析方法[J].空间结构,2010,16(3):13-17.ZHOU Hai-tao,ZHANG Yi-gang,WU Jin-zhi.Numericalsimulation method considering the cumulative effect ofplastic damage for beam element[J].Spatial Structures,2010,16(3):13-17.(in Chinese)
[10]CHOPRA A K.Dynamics of structure:theory andapplications to earthquake engineering[M].Beijing:Tingshua Pub,2005:171-174.
[11]谢礼立,马玉宏,翟长海.基于性态的抗震设防与设计地震动[M].北京:科学出版社,2009:37-38.
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