基于纤维模型的钢筋混凝土构件的数值分析
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摘要
有限元分析软件Open Sees对钢筋混凝土结构非线性反应的模拟具有良好的精度。基于此,本文采用Open Sees,选取PEER数据库中由Kunnath等完成的钢筋混凝土试件的拟静力试验进行数值模拟,并对数值模拟过程中积分点数和纵筋低周疲劳效应的影响进行了讨论分析。结果表明:不同的积分点数、是否考虑纵筋的低周疲劳效应对模拟结果有显著的影响;对于较小位移幅值加载的试件,采用5个积分点,不考虑纵筋低周疲劳效应的模拟结果较好;对于较大位移幅值加载的试件,采用3个积分点,考虑纵筋低周疲劳效应的模拟结果较好。
The finite element analysis software,namely Open Sees can simulate the nonlinear responses of reinforced concrete structures accurately. In the paper,the pseudo static tests for reinforced concrete specimens conducted by Kunnath et al in the PEER database is simulated with Open Sees. Then the influence of the number of integration point and the effect of low cycle fatigue of longitudinal reinforcement is discussed. The results Indicate that different integration points and the low cycle fatigue effect of longitudinal reinforcement has a significant influence on the simulation results. For the specimen with smaller displacement amplitude,there is a good simulation results with five integration points and without regard to the low cycle fatigue effect of longitudinal reinforcement. For the specimen with larger displacement amplitude,the results with three integration points and considering the low cycle fatigue effect are acceptable.
The finite element analysis software,namely Open Sees can simulate the nonlinear responses of reinforced concrete structures accurately. In the paper,the pseudo static tests for reinforced concrete specimens conducted by Kunnath et al in the PEER database is simulated with Open Sees. Then the influence of the number of integration point and the effect of low cycle fatigue of longitudinal reinforcement is discussed. The results Indicate that different integration points and the low cycle fatigue effect of longitudinal reinforcement has a significant influence on the simulation results. For the specimen with smaller displacement amplitude,there is a good simulation results with five integration points and without regard to the low cycle fatigue effect of longitudinal reinforcement. For the specimen with larger displacement amplitude,the results with three integration points and considering the low cycle fatigue effect are acceptable.
引文
[1]杜轲.常用三维结构弹塑性分析软件的应用与比较[D].哈尔滨:中国地震局工程力学研究所,2010.DU Ke.The application and compare of three dimensional structure elastoplastic analysis softwares in common use[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2010.(in Chinese)
[2]Sashi K.Kunnath.Cumulative seismic damage of reinforced concrete bridges piers[R].University of Central Florida Orlando,Florida,1997.
[3]Mazzoni S,Mc Kenna F,Scott MH.Open Sees command language manual[M].Pacific Earthquake Engineering Research Center,2007.
[4]陈伟.基于Open Sees平台开发的混凝土滞回本构模型在结构分析中的应用[D].重庆:重庆大学,2012.CHEN Wei.Applicability of hysteretic constitutive models of concrete in structural analysis based on development of Open Sees[D].Chongqing:Chongqing University,2012.(in Chinese)
[5]杨红,张洛,张和平.考虑纵筋屈曲及疲劳损伤的钢筋混凝土柱抗震性能试验研究与非线性分析[J].建筑结构学报,2013,34(11):130-140.YANG Hong,Zh ANG Luo,ZHANG Heping.Experiments and nonlinear analysis on seismic behavior of RC columns considering buckling and fatigue damage of reinforcing steel bar[J].Journal of Building Structures,2013,34(11):130-140.(in Chinese)
[6]JIAN ZHAO,SRI SRITHARAN.Modeling of strain penetration effects in fiber-based analysis of reinforced concrete structures[J].ACI Structural Journal,2007,104(2):133-141.
[7]杜轲,孙景江,刘琛.基于力插值的非线性梁柱单元中固定端部求积节点的积分方法[J].工程力学,2013,30(9):1-27.DU Ke,SUN Jingjiang,LIU Chen.Integration methods for fixed integration point at the end of force-based beam-column elements[J].Engineering Mechanics,2013,30(9):1-27.(in Chinese)
[8]张和平.钢筋混凝土柱抗震性能试验及优化模拟分析[D].重庆:重庆大学,2012.ZHANG Heping.Experiment and optimized modeling on seismic performance of RC column[D].Chongqing:Chongqing University,2012.(in Chinese)
[2]Sashi K.Kunnath.Cumulative seismic damage of reinforced concrete bridges piers[R].University of Central Florida Orlando,Florida,1997.
[3]Mazzoni S,Mc Kenna F,Scott MH.Open Sees command language manual[M].Pacific Earthquake Engineering Research Center,2007.
[4]陈伟.基于Open Sees平台开发的混凝土滞回本构模型在结构分析中的应用[D].重庆:重庆大学,2012.CHEN Wei.Applicability of hysteretic constitutive models of concrete in structural analysis based on development of Open Sees[D].Chongqing:Chongqing University,2012.(in Chinese)
[5]杨红,张洛,张和平.考虑纵筋屈曲及疲劳损伤的钢筋混凝土柱抗震性能试验研究与非线性分析[J].建筑结构学报,2013,34(11):130-140.YANG Hong,Zh ANG Luo,ZHANG Heping.Experiments and nonlinear analysis on seismic behavior of RC columns considering buckling and fatigue damage of reinforcing steel bar[J].Journal of Building Structures,2013,34(11):130-140.(in Chinese)
[6]JIAN ZHAO,SRI SRITHARAN.Modeling of strain penetration effects in fiber-based analysis of reinforced concrete structures[J].ACI Structural Journal,2007,104(2):133-141.
[7]杜轲,孙景江,刘琛.基于力插值的非线性梁柱单元中固定端部求积节点的积分方法[J].工程力学,2013,30(9):1-27.DU Ke,SUN Jingjiang,LIU Chen.Integration methods for fixed integration point at the end of force-based beam-column elements[J].Engineering Mechanics,2013,30(9):1-27.(in Chinese)
[8]张和平.钢筋混凝土柱抗震性能试验及优化模拟分析[D].重庆:重庆大学,2012.ZHANG Heping.Experiment and optimized modeling on seismic performance of RC column[D].Chongqing:Chongqing University,2012.(in Chinese)
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