45°方向地震作用下RC空间梁柱节点破坏机制研究
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摘要
汶川地震中大量钢筋混凝土结构房屋柱端严重破坏、甚至引起房屋倒塌,没有形成"强柱弱梁"破坏机制.本文从空间梁柱节点受力分析、模型试验和有限元数值分析3个方面论述了钢筋混凝土空间梁柱节点在45°方向地震作用下的破坏机制,在现行抗震设计规范规定沿结构两个主轴方向分别计算地震作用并进行抗震验算的设计方法中,没有考虑45°方向地震作用是造成不能形成"强柱弱梁"破坏机制的主要原因之一,指出了在框架结构"强柱弱梁"抗震设计中应考虑45°方向地震作用的必要性.
The prefered strong-column weak-beam mechanism had not been realized in Wen-Chun earthquake and many buildings have been damaged for the reason of it.In this paper the damage mechanism of the spatial joint under the 45-degree direction earthquake affection was discussed through the mechanical analysis,cyclic loading experiment and the finite element analysis.The aseismic design method prefered in the code have not considered the 45-degree direction earthquake affection and it is considered as one of the main reason that the strong-column weak-beam mechanism had not been realized in earthquake,the necessity of the 45-degree direction aseismic designing is also suggested.
The prefered strong-column weak-beam mechanism had not been realized in Wen-Chun earthquake and many buildings have been damaged for the reason of it.In this paper the damage mechanism of the spatial joint under the 45-degree direction earthquake affection was discussed through the mechanical analysis,cyclic loading experiment and the finite element analysis.The aseismic design method prefered in the code have not considered the 45-degree direction earthquake affection and it is considered as one of the main reason that the strong-column weak-beam mechanism had not been realized in earthquake,the necessity of the 45-degree direction aseismic designing is also suggested.
引文
[1]中华人民共和国国家标准,《建筑抗震设计规范》GB50011—2010[S].北京:中国建筑工业出版社,2010.
[2]王亚勇.汶川地震建筑震害启示—抗震概念设计[J].建筑结构学报,2008,29(4):20-25.WANG Ya-yong.Lessons learnt from building damages in the Wenchuan earthquake—seismic concept design of buildings[J].Journal of Building Structures,2008,29(4):20-25.(in Chinese)
[3]叶列平,曲哲.从汶川地震框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.YE Lie-ping,QU Zhe.Study on ensuring the strong column-weak beam mechanism for RC Frames based on the damageanalysis in the Wenchuan earthquake[J].Building Structure,2008,38(11):52-59.(in Chinese)
[4]冯远,肖克艰.汶川地震灾害引发建筑结构设计者的思考[J].建筑结构,2008,38(7):25-27.FENG Yuan,XIAO Ke-jian.The structure designer’s consideration after the Wenchuan earthquake[J].Building Structure,2008,38(7):25-27.(in Chinese)
[5]日本建筑学会.结构抗震设计手册[M].日本:オ?ム株式会社,2008:266-270.
[6]中华人民共和国国家标准,《混凝土结构设计规范》GB50011—2010[S].北京:中国建筑工业出版社,2010.
[7]蔡建,周靖,方小舟.柱端弯矩增大系数取值对RC框架结构抗震性能影响的评估[J].土木工程学报,2007,40(1):7-14.CAI Jian,ZHOUJing,FANG Xiao-zhou.Evaluation of influences of various moment magnifying coefficients at column ends ofRC frames on seismic performance[J].China Civil Engineering Journal,2007,40(1):7-14.(in Chinese)
[8]杨红,韦峰,白绍良,等.柱增强系数取值对钢筋混凝土抗震框架塑性铰机构的控制效果[J].工程力学,2005,22(2):155-161.YANG Hong.WEI Feng,BAI Shao-liang,et al.Effect of moment amplification factorof columns on controlling plastic hingemechanism of RC frams[J].Engineering Mechanics,2005,22(2):155-161.(in Chinese)
[9]杨红,王建辉,白绍良.双向地震作用对框架柱端弯矩增大系数的影响分析[J].土木工程学报,2008,41(9):40-47.YANG Hong,WANG Jian-hui,BAI Shao-liang.Effect of bi-directional horizontal seismic excitation on the momentamplification factor of columns[J].China Civil Engineering Journal,2008,41(9):40-47.(in Chinese)
[2]王亚勇.汶川地震建筑震害启示—抗震概念设计[J].建筑结构学报,2008,29(4):20-25.WANG Ya-yong.Lessons learnt from building damages in the Wenchuan earthquake—seismic concept design of buildings[J].Journal of Building Structures,2008,29(4):20-25.(in Chinese)
[3]叶列平,曲哲.从汶川地震框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.YE Lie-ping,QU Zhe.Study on ensuring the strong column-weak beam mechanism for RC Frames based on the damageanalysis in the Wenchuan earthquake[J].Building Structure,2008,38(11):52-59.(in Chinese)
[4]冯远,肖克艰.汶川地震灾害引发建筑结构设计者的思考[J].建筑结构,2008,38(7):25-27.FENG Yuan,XIAO Ke-jian.The structure designer’s consideration after the Wenchuan earthquake[J].Building Structure,2008,38(7):25-27.(in Chinese)
[5]日本建筑学会.结构抗震设计手册[M].日本:オ?ム株式会社,2008:266-270.
[6]中华人民共和国国家标准,《混凝土结构设计规范》GB50011—2010[S].北京:中国建筑工业出版社,2010.
[7]蔡建,周靖,方小舟.柱端弯矩增大系数取值对RC框架结构抗震性能影响的评估[J].土木工程学报,2007,40(1):7-14.CAI Jian,ZHOUJing,FANG Xiao-zhou.Evaluation of influences of various moment magnifying coefficients at column ends ofRC frames on seismic performance[J].China Civil Engineering Journal,2007,40(1):7-14.(in Chinese)
[8]杨红,韦峰,白绍良,等.柱增强系数取值对钢筋混凝土抗震框架塑性铰机构的控制效果[J].工程力学,2005,22(2):155-161.YANG Hong.WEI Feng,BAI Shao-liang,et al.Effect of moment amplification factorof columns on controlling plastic hingemechanism of RC frams[J].Engineering Mechanics,2005,22(2):155-161.(in Chinese)
[9]杨红,王建辉,白绍良.双向地震作用对框架柱端弯矩增大系数的影响分析[J].土木工程学报,2008,41(9):40-47.YANG Hong,WANG Jian-hui,BAI Shao-liang.Effect of bi-directional horizontal seismic excitation on the momentamplification factor of columns[J].China Civil Engineering Journal,2008,41(9):40-47.(in Chinese)
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