基于损伤演化的杆件断裂模拟方法及其应用
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摘要
建立了钢材的弹塑性损伤本构模型,将其与有限单元法中分段纤维梁模型结合,实现了杆件不同位置损伤程度评估,根据评估结果实时修正杆件特性,建立了杆件断裂数值模拟方法。将所建立的杆件断裂模拟方法应用于单调递增荷载作用下的梁系结构和地震作用下的单层网壳结构,结果表明,所建立方法可有效地模拟杆件断裂;杆件断裂突然,与其相连的节点位移及杆件应变能突增,可能导致与其相连杆件破坏;强震作用下单层网壳结构可能发生杆件断裂,导致结构局部刚度降低,引起结构倒塌破坏。
Considering damage evolution,steel elastic-plastic constitutive model was built and applied to segmentation fiber beam to evaluate the damage level at different positions of a member.Based on damage value,a simulation method of member fracture was established by modifying the member characteristics in real time.Then,the simulation method of member fracture was applied to a beam structure under a monotonously increasing load and a single-layer reticulated shell under earthquake.The analysis results showed that the simulation method is able to simulate member fracture effectively;since member fracture is sudden,node displacement and strain energy of members connected to the fractured member increase suddenly,it may lead to failure of members;member fracture may occur in a single-layer reticulated shell under strong earthquake,then it decreases the local structural stiffness and results in structural collapse.
Considering damage evolution,steel elastic-plastic constitutive model was built and applied to segmentation fiber beam to evaluate the damage level at different positions of a member.Based on damage value,a simulation method of member fracture was established by modifying the member characteristics in real time.Then,the simulation method of member fracture was applied to a beam structure under a monotonously increasing load and a single-layer reticulated shell under earthquake.The analysis results showed that the simulation method is able to simulate member fracture effectively;since member fracture is sudden,node displacement and strain energy of members connected to the fractured member increase suddenly,it may lead to failure of members;member fracture may occur in a single-layer reticulated shell under strong earthquake,then it decreases the local structural stiffness and results in structural collapse.
引文
[1]Tavarez F A,Plesha M E.Discrete element method formodeling solid and particulate materials[J].InternationalJournal for Numerical Methods in Engineering,2007,70:379-404.
[2]Wu J H,Ohnishi Y,Shi G H,et al.Theory of three-dimensional discontinuous deformation analysis and itsapplication to a slope toppling at Amatoribashi[J].International Journal of Geomechanics,2005,5(3):179-195.
[3]Tagel-Din H,Meguro K.Nonlinear simulation of RCstructures using applied element method[J].Struct Eng/Earthquake Eng,2000,17(2):137-148.
[4]Benavent A C.An energy-based damage model for seismicresponse of steel structures[J].Earthquake Engineering andStructural Dynamics,2007,36:1049-1064.
[5]贲庆国.钢框架结构地震作用下累积损伤分析及试验研究[D].南京:南京工业大学土木工程学院,2003.
[6]沈祖炎,董宝,曹文衔.结构损伤累积分析的研究现状和存在的问题[J].同济大学学报,1997,25(2):135-140.SHEN Zu-yan,DONG Bao,CAO Wen-xian.Developmentand evaluation of researches on damage cumulation analysisfor building structures[J].Journal of Tongji Univercity,1997,25(2):135-140.
[7]Shen Z,Dong B.An experiment-based cumulative damagemechanics model of steel under cyclic loading[J],Advancesin Structural Engineering,1997(1):39-46.
[8]宋振森.超高层钢结构考虑损伤和损伤累积分析方法[D].上海:同济大学土木工程学院,2004.
[9]于建华,谢用久,魏泳涛,等.高等结构动力学[M].成都:四川大学出版社,2001.
[10]GB50011-2010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[11]ISO10721-1,Steel structure,material and design[S].Switzerland:European Committee for Standardization,1997.
[12]Marshall P W,Gates W E,Anagnostopoulos S.Inelastic dynamic analysis of tubular offshore structures[A].In:Proceedings of Ninth Annual Offshore Technology Conference[C].Houston,U S A,1977:235-246.
[2]Wu J H,Ohnishi Y,Shi G H,et al.Theory of three-dimensional discontinuous deformation analysis and itsapplication to a slope toppling at Amatoribashi[J].International Journal of Geomechanics,2005,5(3):179-195.
[3]Tagel-Din H,Meguro K.Nonlinear simulation of RCstructures using applied element method[J].Struct Eng/Earthquake Eng,2000,17(2):137-148.
[4]Benavent A C.An energy-based damage model for seismicresponse of steel structures[J].Earthquake Engineering andStructural Dynamics,2007,36:1049-1064.
[5]贲庆国.钢框架结构地震作用下累积损伤分析及试验研究[D].南京:南京工业大学土木工程学院,2003.
[6]沈祖炎,董宝,曹文衔.结构损伤累积分析的研究现状和存在的问题[J].同济大学学报,1997,25(2):135-140.SHEN Zu-yan,DONG Bao,CAO Wen-xian.Developmentand evaluation of researches on damage cumulation analysisfor building structures[J].Journal of Tongji Univercity,1997,25(2):135-140.
[7]Shen Z,Dong B.An experiment-based cumulative damagemechanics model of steel under cyclic loading[J],Advancesin Structural Engineering,1997(1):39-46.
[8]宋振森.超高层钢结构考虑损伤和损伤累积分析方法[D].上海:同济大学土木工程学院,2004.
[9]于建华,谢用久,魏泳涛,等.高等结构动力学[M].成都:四川大学出版社,2001.
[10]GB50011-2010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[11]ISO10721-1,Steel structure,material and design[S].Switzerland:European Committee for Standardization,1997.
[12]Marshall P W,Gates W E,Anagnostopoulos S.Inelastic dynamic analysis of tubular offshore structures[A].In:Proceedings of Ninth Annual Offshore Technology Conference[C].Houston,U S A,1977:235-246.
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