抗震结构柱端塑性铰形成机制有限元分析
|
摘要
针对汶川地震中钢筋混凝土结构出现大量的脆性破坏,以抗震结构设计中的塑性铰为研究目标,应用ANSYS程序对框架结构中最易出现塑性铰的节点部位进行了有限元分析。计算中采用了钢筋单元与混凝土单元变形不协调模型。结果显示,引起柱端脆性破坏的原因在于节点部位梁与柱的刚度失衡,柱端延性下降。目前抗震设计规范中的"强柱弱梁"、"强剪弱弯"原则和相关措施,不能保证塑性铰一定出现在梁端,结构抗震设计中常用的本构关系模型有待改进。
In connection with a mass of brittle failures of reinforced concrete constructions in Whenchuan earthquake,plastic hinge in the anti-seismic design was selected as the research object,and ANSYS procedure was implemented to conduct a finite element analysis for nodes of the framework where plastic hinges may exist.In the calculation,the model with uncoordinated strain between steel and concrete units was adopted.The results demonstrate that the plastic hinges cannot always occur at the end of the beam according to the principles of "strong column weak beam" and "strong shear weak bending" from the current seismic design code.Cause leading to brittle failure of column-end is imbalanc of rigidity between beam-end and column-end.The ordinary constitutive model in seismic codes of structre remain to be improved
In connection with a mass of brittle failures of reinforced concrete constructions in Whenchuan earthquake,plastic hinge in the anti-seismic design was selected as the research object,and ANSYS procedure was implemented to conduct a finite element analysis for nodes of the framework where plastic hinges may exist.In the calculation,the model with uncoordinated strain between steel and concrete units was adopted.The results demonstrate that the plastic hinges cannot always occur at the end of the beam according to the principles of "strong column weak beam" and "strong shear weak bending" from the current seismic design code.Cause leading to brittle failure of column-end is imbalanc of rigidity between beam-end and column-end.The ordinary constitutive model in seismic codes of structre remain to be improved
引文
[1]GB50010-2002.混凝土结构设计规范[S],2002.
[2]叶列平,曲哲,马千里,林旭川,陆新征,潘鹏.从汶川地震中框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.
[3]叶列平,程光煜,陆新征,冯鹏.论建筑结构抗震的鲁棒性[J].建筑结构,2008,no.6:11-15
[4]Ye LP,Qu Z.Failure mechanism and its control of building structures under earthquakes based on structural system concept,The International Sym-posium on Advances in Urban Safety,Nanjing,China,Oct.2007:150-157
[5]周尚志,党发宁,陈厚群,刘瑛.单轴压缩CT条件下混凝土细观结构破裂分析,海洋工程,2009.5:89-94
[6]Base GD.Crack control in reinforced concrete-present position[M].Melbourne:Syposium on Service ability of concrete,1975
[7]Broms BB,Lntz LA.Effect of arrangement on crack width and spacing of reinforced concrete members[J].ACI 1965,62(11):1395-1410
[8]钱洪基,刘枫.建筑结构抗震分析反应谱理论的直接算法[J].建筑科学,2003.04:1-3
[9]刘齐茂,燕柳斌.基于零阶和一阶优化算法的建筑结构抗震优化设计.华南地震,2008.12:27-33
[2]叶列平,曲哲,马千里,林旭川,陆新征,潘鹏.从汶川地震中框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.
[3]叶列平,程光煜,陆新征,冯鹏.论建筑结构抗震的鲁棒性[J].建筑结构,2008,no.6:11-15
[4]Ye LP,Qu Z.Failure mechanism and its control of building structures under earthquakes based on structural system concept,The International Sym-posium on Advances in Urban Safety,Nanjing,China,Oct.2007:150-157
[5]周尚志,党发宁,陈厚群,刘瑛.单轴压缩CT条件下混凝土细观结构破裂分析,海洋工程,2009.5:89-94
[6]Base GD.Crack control in reinforced concrete-present position[M].Melbourne:Syposium on Service ability of concrete,1975
[7]Broms BB,Lntz LA.Effect of arrangement on crack width and spacing of reinforced concrete members[J].ACI 1965,62(11):1395-1410
[8]钱洪基,刘枫.建筑结构抗震分析反应谱理论的直接算法[J].建筑科学,2003.04:1-3
[9]刘齐茂,燕柳斌.基于零阶和一阶优化算法的建筑结构抗震优化设计.华南地震,2008.12:27-33
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心