地震作用下钢筋混凝土框架结构防倒塌的判别
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摘要
在地震作用下保证钢筋混凝土框架结构耗能最大化,同时保证在弹塑性变形条件下大震不倒,对框架结构意义重大。基于功能原理,对框架结构在水平地震作用下达到最大弹塑性位移时的2种变形破坏模式柱铰机制和梁铰机制进行分析,给出结构倒塌指标KS的下限值和防倒塌的评估判别式,通过算例和实例对规范中框架结构防倒塌的相关要求进行了计算验证。结果显示,现行抗震规范对罕遇地震作用下钢筋混凝土框架结构变形控制值是略偏保守的。
It is the great significance to ensure maximum energy consumption of the R C frame structure subjected to earthquakes and to prevent structure from collapse under the elastic-plastic deformation.Based on Workenergy principle,two kinds of collapse deformation mode column plastic hinge mechanism and beam plastic hinge mechanism for R C frame structure are analyzed,which have achieved limit deformation prescribed by code.A minimum collapse index K_S and an assessment formular of avoiding collapse are given.Through calculating examples the relevant requirements in current code for seismic design of buildings are checked.The results showed that the structure deformation limit value of R C framework subject to severe seismic action is still a little bit conservative.
It is the great significance to ensure maximum energy consumption of the R C frame structure subjected to earthquakes and to prevent structure from collapse under the elastic-plastic deformation.Based on Workenergy principle,two kinds of collapse deformation mode column plastic hinge mechanism and beam plastic hinge mechanism for R C frame structure are analyzed,which have achieved limit deformation prescribed by code.A minimum collapse index K_S and an assessment formular of avoiding collapse are given.Through calculating examples the relevant requirements in current code for seismic design of buildings are checked.The results showed that the structure deformation limit value of R C framework subject to severe seismic action is still a little bit conservative.
引文
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[2]胡庆昌.建筑结构抗震设计与研究[C].北京:中国建筑工业出版社,1999:400-407.
[3]戴国莹.结构的抗震变形验算[J].建筑结构,1990(6):31-33.
[4]李国强,李杰,苏小卒.建筑结构抗震设计[M].北京:中国建筑工业出版社,2005:83-85.
[5]R.帕克,T.波利.钢筋混凝土结构[M].秦文钺,等译.重庆:重庆大学出版社,1985:106-107,118-120.
[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):155-161.
[7]杨文星,罗少锋.单自由度体系地震能量反应的计算[J].西安建筑科技大学学报,2006,26(1):40-47.
[8]熊仲明,史庆轩.钢筋混凝土框架结构倒塌破坏能量分析的研究[J].振动与冲击,2003,22(4):8-11.
[9]KATO B,AKIYAMA H.Energy input and damagesin structures to severe earthquakes[J].Tans ArchTnst,1957(235):9-18.
[10]UANG C M,BERTERO V V.Evaluation seismicenergy in structures[J].Earthquake Engineering andStructure,Dynamics,1990,19(1):77-90.
[11]张雷明,刘西拉.钢筋混凝土结构倒塌分析的前沿研究[J].地震工程与工程振动,2003,23(3):47-52.
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