钢筋混凝土框架柱端弯矩增大系数初探
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摘要
四川汶川地震中,房屋典型的震害表现为,一些钢筋混凝土框架结构柱端出现了严重的塑性铰,而梁端震害反而较轻,"强柱弱梁"的抗震设计目标在混凝土框架中未能实现。本文首先总结了我国现行规范中关于"强柱弱梁"的相关规定及存在的问题,然后分析不同柱端弯矩增大系数对框架结构塑性铰分布的影响,结果表明,当柱端弯矩增大系数取为1.7时能有效地实现"强柱弱梁"。
In the Wenchuan Earthquake,earthquake damage about houses typically expressed as a number of reinforced concrete frame structures are damaged seriously with plastic hinges occurred at column ends rather than beam ends,which is significantly different to the failure mode expected in the seismic design of strong column weak beam.In this paper,the relevant provisions on Chinese existing design code about "strong column-weak beam" and the existing problems are presented,and then the effect of different moment amplification factor of column on distribution of plastic hinges is analyzed.Analysis shows that when the moment amplification factor is 1.7 can effective achieve"strong column weak beam".
In the Wenchuan Earthquake,earthquake damage about houses typically expressed as a number of reinforced concrete frame structures are damaged seriously with plastic hinges occurred at column ends rather than beam ends,which is significantly different to the failure mode expected in the seismic design of strong column weak beam.In this paper,the relevant provisions on Chinese existing design code about "strong column-weak beam" and the existing problems are presented,and then the effect of different moment amplification factor of column on distribution of plastic hinges is analyzed.Analysis shows that when the moment amplification factor is 1.7 can effective achieve"strong column weak beam".
引文
[1]GB50011-2001,建筑抗震设计规范[S]GB50011-2001,Code for Seismic Design of Buildings[S](in Chinese)
[2]JGJ3-2002,高层建筑混凝土结构技术规程[S]JGJ3-2002,Technical Specification for Concrete Structures of Tall Building[S](in Chinese)
[3]陆新征,江见鲸.利用ANSYS Solid65单元分析复杂应力条件下的混凝土结构[J].建筑结构,2003,33(6):22～24Lu Xin-zheng,Jiang Jian-jing.Analysis for Concrete Structure under Complex Stress Condition with Solid65FEA Element of ANSYS[J]Building Structure,2003,33(6),22～24(in Chinese)
[4]林旭川,潘鹏,叶列平,等.汶川地震中典型RC框架结构的震害仿真与分析[J].土木工程学报,2009,42(5):13～20Lin Xu-chuan,Pan Peng,Ye Lie-ping,et al.Analysis on damage mechanism of a typical RC frame in Wenchuan Earthquake[J].China Civil Engineering Journal,2009,42(5):13～20(in Chinese)
[5]叶列平,曲哲,马千里,等.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):52～59Ye Lie-ping,Qu Zhe,Ma Qian-li,et al.Study on ensuring the strong column-weak beam mechanism for RC frames based on the damage analysis in the Wenchuan Earthquake[J].Building Structure,2008,38(11):52～59(in Chinese)
[6]杨红,韦锋,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):156～161Yang Hong,Wei Feng,Bai Shao-liang,et al.Effect of moment amplification factors of columns on Controlling plastic hinge mechanism of RC frames[J].Engineering Mechanics,2005,22(2):156～161(in Chinese)
[7]薛彦涛,黄世敏,姚秋来,等.汶川地震钢筋混凝土框架结构震害及对策[J].工程抗震与加固改造,2009,31(5):93～100Xue Yan-tao,Huang Shi-min,Yao Qiu-lai,et al.Seismic Damage and Design Concept from the Buildings of RC Frame Structure in Wenchuan Earthquake[J].Earthquake Resistant Engineering and Retrofitting,2009,31(5):93～100(in Chinese)
[2]JGJ3-2002,高层建筑混凝土结构技术规程[S]JGJ3-2002,Technical Specification for Concrete Structures of Tall Building[S](in Chinese)
[3]陆新征,江见鲸.利用ANSYS Solid65单元分析复杂应力条件下的混凝土结构[J].建筑结构,2003,33(6):22～24Lu Xin-zheng,Jiang Jian-jing.Analysis for Concrete Structure under Complex Stress Condition with Solid65FEA Element of ANSYS[J]Building Structure,2003,33(6),22～24(in Chinese)
[4]林旭川,潘鹏,叶列平,等.汶川地震中典型RC框架结构的震害仿真与分析[J].土木工程学报,2009,42(5):13～20Lin Xu-chuan,Pan Peng,Ye Lie-ping,et al.Analysis on damage mechanism of a typical RC frame in Wenchuan Earthquake[J].China Civil Engineering Journal,2009,42(5):13～20(in Chinese)
[5]叶列平,曲哲,马千里,等.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):52～59Ye Lie-ping,Qu Zhe,Ma Qian-li,et al.Study on ensuring the strong column-weak beam mechanism for RC frames based on the damage analysis in the Wenchuan Earthquake[J].Building Structure,2008,38(11):52～59(in Chinese)
[6]杨红,韦锋,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):156～161Yang Hong,Wei Feng,Bai Shao-liang,et al.Effect of moment amplification factors of columns on Controlling plastic hinge mechanism of RC frames[J].Engineering Mechanics,2005,22(2):156～161(in Chinese)
[7]薛彦涛,黄世敏,姚秋来,等.汶川地震钢筋混凝土框架结构震害及对策[J].工程抗震与加固改造,2009,31(5):93～100Xue Yan-tao,Huang Shi-min,Yao Qiu-lai,et al.Seismic Damage and Design Concept from the Buildings of RC Frame Structure in Wenchuan Earthquake[J].Earthquake Resistant Engineering and Retrofitting,2009,31(5):93～100(in Chinese)
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