钢筋混凝土框架刚塑性抗震设计方法研究
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摘要
在罕遇地震作用下,钢筋混凝土框架结构通常要经历相当大的塑性变形,地震输入的动能绝大部分转化为塑性变形能而被耗散,仅有很少部分转化为弹性变形能,基于这种能量转化机制,采用刚塑性模型来预测地震反应。同时建议在结构设计时于适当位置预设塑性铰,使结构在强烈地震作用下的能量耗散集中在塑性铰处,并保证结构整体性,从而达到结构大震不倒的设防水准。以塑性理论为基础,发展了一种适用于钢筋混凝土框架结构刚塑性抗震设计方法。文中最后以5层钢筋混凝土框架为例给出了分析结果,并与弹塑性时程分析进行了对比,两者的一致性是相当满意的。由此表明,刚塑性抗震设计方法概念清晰,计算简单,具有可靠精度,可以满足罕遇地震作用下钢筋混凝土框架结构抗震设计要求。
Under strong earthquake a reinforced concrete frame usually undergoes large plastic deformation.Most of kinetic energy rising from the earthquake is dissipated through plastic deformation,and only a little part is converted into elastic deformation energy.In view of the mechanism of energy transformation,a rigid-perfectly plastic model is used for predicting the earthquake response of R C frame structures.In order to avoid structure collapse under strong earthquake,the structures can be designed in such a way of arranging some plastic hinges in appropriate locations so that the dissipation of energy is concentrated in plastic hinges,and the entirety of the structures is retained.Based on the theory of plasticity,a new method of rigid-plastic-seismic-design for the reinforced concrete frame struclures is developed.The application of the method is illustrated by means of an example of a five-story reinforced concrete frame design.The comparison of results with ones by using non-linear time-history analysis shows good agreement.It follows that the method proposed in this paper has advantages of clear concept,simple calculation and reliable accuracy.It can be used in seismic design for the reinforced concrete frame structures.
Under strong earthquake a reinforced concrete frame usually undergoes large plastic deformation.Most of kinetic energy rising from the earthquake is dissipated through plastic deformation,and only a little part is converted into elastic deformation energy.In view of the mechanism of energy transformation,a rigid-perfectly plastic model is used for predicting the earthquake response of R C frame structures.In order to avoid structure collapse under strong earthquake,the structures can be designed in such a way of arranging some plastic hinges in appropriate locations so that the dissipation of energy is concentrated in plastic hinges,and the entirety of the structures is retained.Based on the theory of plasticity,a new method of rigid-plastic-seismic-design for the reinforced concrete frame struclures is developed.The application of the method is illustrated by means of an example of a five-story reinforced concrete frame design.The comparison of results with ones by using non-linear time-history analysis shows good agreement.It follows that the method proposed in this paper has advantages of clear concept,simple calculation and reliable accuracy.It can be used in seismic design for the reinforced concrete frame structures.
引文
[1]Pridstley MJ N.Myths and Fallacies in Earthquake Engineering[M].IUSS Press:Pavia,2003:52-68.
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[3]李晓丽,吴敏哲,郭棣.基于性能的抗震设计研究[J].世界地震工程,2004,20(1):153-156.
[4]Chopra AK,Goel R K.Direct displacement-based design:use of inelastic vs.elastic design spectra[J].Earthquake Spectra,2001;17(1):47-64.
[5]Domningues Costa J L,Bento R,Levtch V.Simplified non-linear time-history analysis based on theory of plasticity[C]//Proceedings of the ERES2005 Conference.Skiathos,Greece.WIT-Press:Southampton,U.K.2005:375-386.
[6]Paglietti A,C.porcu M.Rigid-plastic approximation to predict plastic motion under strong earthquakes[J].Earthquake Engineering and Structur-al Dynamics,2001,30(1):115-126.
[7]丁建,白国良,蒋建,等.钢筋混凝土框架结构直接基于损伤性能的抗震设计方法研究[J].世界地震工程,2007,23(4):199-204.
[8]霍奇P G,著.结构的塑性分析[M].蒋詠秋,熊祝华,译.北京:科学出版社,1996:115-120.
[9]王仁,黄文彬,等.塑性力学引论[M].北京:北京大学出版社,1999:53-66.
[10]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001:38-40.
[11]Dowel R K,Seible F,Wilson E L.Pivot hysteresis model for reinforced concrete members[J].Structural Journal of the ACI,1998,95(5):607-617.
[2]Gutierrez A M.An effective method for displacement-based earthquake design of buildings[C]//Proceedings of13th World Conference on Earth-quake Engineering.Vancouver:B.C.Canada,2004:1512-1519.
[3]李晓丽,吴敏哲,郭棣.基于性能的抗震设计研究[J].世界地震工程,2004,20(1):153-156.
[4]Chopra AK,Goel R K.Direct displacement-based design:use of inelastic vs.elastic design spectra[J].Earthquake Spectra,2001;17(1):47-64.
[5]Domningues Costa J L,Bento R,Levtch V.Simplified non-linear time-history analysis based on theory of plasticity[C]//Proceedings of the ERES2005 Conference.Skiathos,Greece.WIT-Press:Southampton,U.K.2005:375-386.
[6]Paglietti A,C.porcu M.Rigid-plastic approximation to predict plastic motion under strong earthquakes[J].Earthquake Engineering and Structur-al Dynamics,2001,30(1):115-126.
[7]丁建,白国良,蒋建,等.钢筋混凝土框架结构直接基于损伤性能的抗震设计方法研究[J].世界地震工程,2007,23(4):199-204.
[8]霍奇P G,著.结构的塑性分析[M].蒋詠秋,熊祝华,译.北京:科学出版社,1996:115-120.
[9]王仁,黄文彬,等.塑性力学引论[M].北京:北京大学出版社,1999:53-66.
[10]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001:38-40.
[11]Dowel R K,Seible F,Wilson E L.Pivot hysteresis model for reinforced concrete members[J].Structural Journal of the ACI,1998,95(5):607-617.
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