强震下弦支穹顶结构的动力失效探讨
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摘要
为了揭示强震下弦支穹顶结构的动力失效机理,分别采用双线性本构模型和应变-损伤耦合本构模型,对一个8点支承的弦支穹顶结构进行了不同地震加速度下的全过程动力时程分析,考察了2种不同材料模型下的结构动力失效.同时对采用应变-损伤耦合本构模型的结构进行了深入研究,对该结构最大位移、塑性杆件数、杆件的应变能密度和动能密度、构件应力及应力变化率等多个物理量准则进行了考察分析.结果表明:采用应变-损伤耦合本构模型能更加准确地反映结构的动力失效,且这些物理量都能大致反映结构动力失效过程中的失效时刻;同时也反映了失效时结构最大位移、杆件塑性发展、索力松弛等失效特征.
In order to reveal the dynamic failure mechanism of suspend-dome structures under severe earthquakes,the dynamic time-history responses for an eight points supporting suspend-dome subjected to different seismic acceleration excitations were investigated by using bilinear constitutive model and strain-damage constitutive model respectively. Further researches on adopting strain-damage constitutive model to simulate the dynamic responses of the suspend-dome structures were implemented. Some physical quantities of the suspend-dome structures,such as the maximal displacement,the number of plastic members,strain energy and kinetic energy density of members,stress and stress change rate,were taken for the dynamic failure criteria and analyzed. The results show that it is more accurate by utilizing the strain-damage constitutive model than the bilinear constitutive model in the simulation of the dynamic failure. All the above physical quantities can roughly reflect when the dynamic failure happens. Also the results present some failure characteristics,such as maximal displacement,plastic development,and cables relaxation etc.
In order to reveal the dynamic failure mechanism of suspend-dome structures under severe earthquakes,the dynamic time-history responses for an eight points supporting suspend-dome subjected to different seismic acceleration excitations were investigated by using bilinear constitutive model and strain-damage constitutive model respectively. Further researches on adopting strain-damage constitutive model to simulate the dynamic responses of the suspend-dome structures were implemented. Some physical quantities of the suspend-dome structures,such as the maximal displacement,the number of plastic members,strain energy and kinetic energy density of members,stress and stress change rate,were taken for the dynamic failure criteria and analyzed. The results show that it is more accurate by utilizing the strain-damage constitutive model than the bilinear constitutive model in the simulation of the dynamic failure. All the above physical quantities can roughly reflect when the dynamic failure happens. Also the results present some failure characteristics,such as maximal displacement,plastic development,and cables relaxation etc.
引文
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[8]董宝,曹文衔,陈学潮.空间网架结构在地震作用下的损伤累积分析[J].上海力学,1996,17(2):127-131.DONG Bao,CAO Wen-xian,CHEN Xue-chao.Damage cumulation analysis of grid structure under earthquakes[J].Shanghai Journal of Mechanics,1996,17(2):127-131.
[9]沈祖炎,沈苏.高层钢结构考虑损伤累积及裂纹效应的抗震分析[J].同济大学学报,2002,30(4):393-398.SHEN Zu-ya,SHEN Su.Seismic Analysis of tall steel structures with damage cumulation and fracture effects[J].Journal of Tongji University,2002,30(4):393-398.
[10]张晓峰.2008奥运羽毛球馆弦支穹顶结构整体稳定及动力性能研究[D].北京:北京工业大学,2006.ZHANG Xiao-feng.The research of overall stability and dynamical capability to the suspen-dome structures of the badminton arena for2008Olympic Games[D].Beijing:Beijing Polytechnic University,2006.
[11]付志强.弦支穹顶结构动力灾变研究[D].杭州:浙江大学,2007.FU Zhi-qiang.Research on dynamic failure of suspen-dome structure[D].Hangzhou:Zhejiang University,2007.
[12]杜文风,高博青,董石麟.一种判定杆系结构动力稳定的新方法-应力变化率法[J].浙江大学学报:工学版,2006,40(3):506-510.DU Wen-feng,GAO Bo-qing,DONG Shi-lin.New judgement method on dynamic instability of truss struc-tures:stress rate method[J].Journal of Zhejiang Uni-versity:Engineering Science,2006,40(3):506-510.
[2]孙晓骥.弦支穹顶结构动力稳定性研究[D].兰州:兰州理工大学,2007.XUN Xiao-ji.Studies on dynamic stability of suspen dome structure[D].Lanzhou:Lanzhou University of Technology,2007.
[3]范峰,钱宏亮,邢洁慧,等.强震作用下球面网壳动力强度破坏研究[J].哈尔滨工业大学学报,2004,36(6):722-725.FAN Feng,QIAN Hong-liang,XING Jie-hui,et al.Dynamic strength fracture of reticular shells under se-vere earthquakes[J].Journal of Harbin Institute of Tech-nology,2004,36(6):722-725.
[4]沈世钊,支旭东.球面网壳结构在强震下的失效机理[J].土木工程学报,2005,38(1):11-20.SHEN Shi-zhao,ZHI Xu-dong.Failure mechanism of reticular shells subjected to dynamic Actions[J].China Civil Engineering Journal,2005,38(1):11-20.
[5]JEAN L.损伤力学教程[M].倪金刚,陶春虎,译.北京:科学出版社,1996:17-20.
[6]SHEN Zu-yan,DONG Bao.An experi ment-based cumu-lative damage mechanics model of steel under cyclic load-ing[J].Advances in Structural Engineering,1997,1(1):79-87.
[7]郭海山.单层球面网壳结构动力稳定性及抗震性能研究[D].哈尔滨:哈尔滨建筑大学,2002.GUO Hai-shan.Research on dynamic stability and aseismic performance of single-layer reticulated dome[D].Harbin:Harbin Institute of Technology,2002.
[8]董宝,曹文衔,陈学潮.空间网架结构在地震作用下的损伤累积分析[J].上海力学,1996,17(2):127-131.DONG Bao,CAO Wen-xian,CHEN Xue-chao.Damage cumulation analysis of grid structure under earthquakes[J].Shanghai Journal of Mechanics,1996,17(2):127-131.
[9]沈祖炎,沈苏.高层钢结构考虑损伤累积及裂纹效应的抗震分析[J].同济大学学报,2002,30(4):393-398.SHEN Zu-ya,SHEN Su.Seismic Analysis of tall steel structures with damage cumulation and fracture effects[J].Journal of Tongji University,2002,30(4):393-398.
[10]张晓峰.2008奥运羽毛球馆弦支穹顶结构整体稳定及动力性能研究[D].北京:北京工业大学,2006.ZHANG Xiao-feng.The research of overall stability and dynamical capability to the suspen-dome structures of the badminton arena for2008Olympic Games[D].Beijing:Beijing Polytechnic University,2006.
[11]付志强.弦支穹顶结构动力灾变研究[D].杭州:浙江大学,2007.FU Zhi-qiang.Research on dynamic failure of suspen-dome structure[D].Hangzhou:Zhejiang University,2007.
[12]杜文风,高博青,董石麟.一种判定杆系结构动力稳定的新方法-应力变化率法[J].浙江大学学报:工学版,2006,40(3):506-510.DU Wen-feng,GAO Bo-qing,DONG Shi-lin.New judgement method on dynamic instability of truss struc-tures:stress rate method[J].Journal of Zhejiang Uni-versity:Engineering Science,2006,40(3):506-510.
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