应变速率型RC梁柱显式分析单元及其在ABAQUS软件中的实现
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摘要
为准确、高效地分析钢筋混凝土(RC)梁柱结构在强动载作用下的损伤破坏甚至倒塌,建立了能够描述大变形、大应变的空间纤维Timoshenko梁单元,并将其与考虑率相关效应的钢筋、混凝土材料模型相结合,通过用户显式单元子程序在ABAQUS中实现。基于所建立的应变速率型3D纤维梁显式单元,借助ABAQUS的前后处理及求解功能,对爆炸荷载作用下的RC梁柱构件的动态响应和破坏模式及RC框架结构的连续性倒塌进行分析。结果表明:建立的应变速率型3D纤维梁柱单元能够合理描述RC构件的变形特性及钢筋、混凝土的应变速率效应;可以模拟爆炸作用下RC构件的弯曲、弯剪及直剪破坏模式,以及RC框架的连续倒塌过程;将纤维梁柱单元与率相关模型相结合于ABAQUS软件提供了一种强动载作用下高效、精确的RC结构非线性分析方法。
In order to predict the damage,failure and even collapse of the reinforced concrete(RC) structures subjected to severe dynamic loads precisely and efficiently,a user defined 3D fiber Timoshenko beam element model considering large deformation and large strain was established,which was embedded into the commercial software ABAQUS combining with the rate-dependent constitutive model of steel and concrete.With the help of ABAQUS,the efficient finite element method adopting the proposed rate-dependent 3D fiber Timoshenko beam element was developed to investigate the damage mechanism and progressive collapse of RC structures under severe dynamic loads.The analytical results indicated that the developed user defined 3D fiber Timoshenko beam element model could simulate the deformation,and failure modes of flexure,flexure-shear,direct shear of RC members,and even progressive collapse of RC structures under dynamic loads properly.The user defined rate-dependent 3D fiber Timoshenko beam element model embedded into ABAQUS provides a precise and efficient method to analyze the nonlinear dynamic responses of RC structures.
In order to predict the damage,failure and even collapse of the reinforced concrete(RC) structures subjected to severe dynamic loads precisely and efficiently,a user defined 3D fiber Timoshenko beam element model considering large deformation and large strain was established,which was embedded into the commercial software ABAQUS combining with the rate-dependent constitutive model of steel and concrete.With the help of ABAQUS,the efficient finite element method adopting the proposed rate-dependent 3D fiber Timoshenko beam element was developed to investigate the damage mechanism and progressive collapse of RC structures under severe dynamic loads.The analytical results indicated that the developed user defined 3D fiber Timoshenko beam element model could simulate the deformation,and failure modes of flexure,flexure-shear,direct shear of RC members,and even progressive collapse of RC structures under dynamic loads properly.The user defined rate-dependent 3D fiber Timoshenko beam element model embedded into ABAQUS provides a precise and efficient method to analyze the nonlinear dynamic responses of RC structures.
引文
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[17]基格.巴尔萨拉.浅埋结构对爆炸荷载的反应[J].防护工程,1982,3(1):34―39.Bagheera J G.Effects of low buried structures subjected to blast loads[J].Protective Engineering,1982,3(1):34―39.(in Chinese)
[18]Stanley C Woodson,James T Baylot.Structural collaspe:quarter scale model experiments[R].Engineering Research and Development Center,Technical Report SL-99-8,1999.
[19]师燕超.爆炸荷载作用下钢筋混凝土结构的动态响应行为与损伤破坏机理[D].天津:天津大学,2009.Shi Yanchao.Dynamic responses and damage of RC structures subjected to blast loads[D].Tianjin:Tianjin University,2009.(in Chinese)
[2]还毅,方秦,陈力.大型地下空间结构地震风险评估研究[J].解放军理工大学学报,2010,11(4):445―450.Huan Yi,Fang Qin,Chen Li.Assessment of seismic risk of large underground structures[J].Journal of PLA University of Science and Technology,2010,11(4):445―450.(in Chinese)
[3]张传爱.常规武器对钢筋混凝土结构的破坏效应研究[D].南京:解放军理工大学,2010.Zhang Chuan’ai.Investigation on the damage of RC structures subjected to conventional weapons[D].Nanjing:PLA University of Science and Technology,2010.(in Chinese)
[4]陆新征,叶列平,缪志伟.建筑抗震弹塑性分析[M].北京:中国建筑工业出版社,2009:12―58.Lu Xinzheng,Ye Lieping,Liao Zhiwei.Elastic-plastic analysis of buildings against earthquake[M].Beijing:China Building Industry Press,2009:12―58.(in Chinese)
[5]禚一,李忠献.基于FENP平台的钢筋混凝土桥墩非线性动力分析[J].天津大学学报,2010,43(10):906―911.Zhuo Yi,Li Zhongxian.Nonlinear dynamic analysis of RC bridge piers based on FENAP platform[J].Journal of Tianjin University,2010,43(10):906―911.(in Chinese)
[6]禚一,李忠献.钢筋混凝土纤维梁柱单元实用模拟平台[J].工程力学,2011,28(4):102―108,127.Zhuo Yi,Li Zhongxian.A practical simulation platform of RC fiber beam-column element[J].Engineering Mechanics,2011,28(4):102―108,127.(in Chinese)
[7]聂利英,李建中,范立础.弹塑性纤维梁柱单元及其单元参数分析[J].工程力学,2004,21(3):15―20.Nie Liying,Li Jianzhong,Fan Lichu.Elastic-plastic fiber beam-column element and its parametric analysis[J].Engineering Mechanics,2004,21(3):15―20.(in Chinese)
[8]Izzuddin B A,Fang Qin.Rate-sensitive analysis of framed structures Part I:Model Formulation and verification[J].Structural Engineering&Mechanics,1997,5(3):221―237.
[9]Fang Qin,Izzuddin B A.Rate-sensitive analysis of framed structures Part II:Implementation and application to steel and R/C frames[J].Structural Engineering&Mechanics,1997,5(3):239―256.
[10]方秦,柳锦春,张亚栋,钱七虎.爆炸荷载作用下钢筋混凝土梁破坏形态有限元分析[J].工程力学,2001,18(2):1―8.Fang Qin,Liu Jingchun,Zhang Yadong,Qian Qihu.Finite element analysis of failure modes of blast-loaded R/C beams[J].Engineering Mechanics,2001,18(2):1―8.(in Chinese)
[11]Owen D R J,Thington E.Finite element of plastic mechanics–theory and application[M].Beijing:Weapon Industry Press,1989:32―56.
[12]杜柏松,项海帆,葛耀君.剪切效应梁单元刚度和质量矩阵的推导及应用[J].重庆交通大学学报,2008,27(4):503―507.Du Baisong,Xiang Haifan,Ge Yaojun.Derivation and application of3D-Beam’s element stiffness and mass matrix with shear effect[J].Journal of Chongqing Jiaotong University,2008,27(4):503―507.(in Chinese)
[13]还毅.强震作用下地铁车站结构损伤破坏的精细化数值仿真与隔震技术研究[D].南京:解放军理工大学,2011.Huan Yi.Fine numerical study on the dynamic response and shock isolation technique of metro station structure under the intensive seismic shock[D].Nanjing:PLA University of Science and Technology,2011.(in Chinese)
[14]Bodner J R,Symonds P S.Plastic deformations in impact and impulsive loading of beams[C].Rhode Island,USA:Proceedings of the Second Symposium on Naval Structural Mechanics,1960:488―500.
[15]Soroushian P,Choi K,Alhamad A.Dynamic constitutive behavior of concrete[J].ACI,1986,83(2):251―258.
[16]Ghabossi J,Millavec W A,Isenberg J.RC Structures under impulsive loading[J].Journal of Structural Engineering,1984,110(3):505―522.
[17]基格.巴尔萨拉.浅埋结构对爆炸荷载的反应[J].防护工程,1982,3(1):34―39.Bagheera J G.Effects of low buried structures subjected to blast loads[J].Protective Engineering,1982,3(1):34―39.(in Chinese)
[18]Stanley C Woodson,James T Baylot.Structural collaspe:quarter scale model experiments[R].Engineering Research and Development Center,Technical Report SL-99-8,1999.
[19]师燕超.爆炸荷载作用下钢筋混凝土结构的动态响应行为与损伤破坏机理[D].天津:天津大学,2009.Shi Yanchao.Dynamic responses and damage of RC structures subjected to blast loads[D].Tianjin:Tianjin University,2009.(in Chinese)
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