采用强化弹塑性模型的钢筋混凝土结构抗震性能设计谱方法
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摘要
建筑结构的常规抗震设计,是按多遇地震作用对结构进行承载力及弹性侧移计算。为了保证结构的抗震性能,须验算结构在设防地震及罕遇地震作用下的承载力及弹塑性侧移。本文采用振型分解反应谱法,其中等效单自由度体系采用强化弹塑性模型,模型主要参数由常规抗震设计确定,屈服后刚度及阻尼比按模型强化段进行调整,利用规范的地震反应谱,进行结构的弹塑性反应分析。二层钢筋混凝土框架结构算例计算结果表明,采用本文提出的设计谱方法与弹塑性时程分析方法的计算结果基本相当,而计算则大为简化。按本文方法所得设防地震及罕遇地震作用下的结构地震响应可用于结构承载力验算,所得侧移可用于结构侧移控制及变形能力设计。
In the conventional seismic design of structures,the strength and elastic deflection are calculated according to frequent earthquakes.In order to ensure the structural seismic performance,the strength and elasto-plastic deflection must also be checked according to the design level earthquake and rare earthquake.Mode-superposition response spectrum method was adopted in this paper.The strengthened elasto-plastic model was used in ESDOF system.The main characteristic values of the model were determined from the conventional seismic design.The post-yield stiffness and damping ratio were modified along the hardened segment of model.The earthquake responses of structure were calculated with the response spectrum of the code.The example analysis of a two-story RC frame shows that the results obtained by the design spectrum method and the elasto-plastic time-history analysis are similar,but the computational process is greatly reduced for the former method.The design level earthquake and rare earthquake actions obtained by the proposed method may be used for checking the structural strength,and the corresponding deflection may be used to control structural deflection and for deformation capacity design.
In the conventional seismic design of structures,the strength and elastic deflection are calculated according to frequent earthquakes.In order to ensure the structural seismic performance,the strength and elasto-plastic deflection must also be checked according to the design level earthquake and rare earthquake.Mode-superposition response spectrum method was adopted in this paper.The strengthened elasto-plastic model was used in ESDOF system.The main characteristic values of the model were determined from the conventional seismic design.The post-yield stiffness and damping ratio were modified along the hardened segment of model.The earthquake responses of structure were calculated with the response spectrum of the code.The example analysis of a two-story RC frame shows that the results obtained by the design spectrum method and the elasto-plastic time-history analysis are similar,but the computational process is greatly reduced for the former method.The design level earthquake and rare earthquake actions obtained by the proposed method may be used for checking the structural strength,and the corresponding deflection may be used to control structural deflection and for deformation capacity design.
引文
[1]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.(GB 50011—2010 Codefor seismic design of buildings[S].Beijing:ChinaArchitectures&Building Press,2010.(in Chinese))
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[3]翟长海,谢礼立.钢筋混凝土框架结构超强研究[J].建筑结构学报,2007,28(1):101-106.(ZHAIChanghai,XIE Lili.Study on overstrength RC framestructures[J].Journal of Building Structures,2007,28(1):101-106.(in Chinese))
[4]JGJ 3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2010.(JGJ 3—2010 Technical specification for concrete structures of tallbuilding[S].Beijing:China Architectures&BuildingPress,2010.(in Chinese))
[5]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.(GB 50010—2010 Code for design of concrete structures[S].Beijing:China Architectures&Building Press,2010.(inChinese))
[6]Chopra A K,Goel R.A modal pushover analysisprocedure for estimating seismic demands for buildings[J].Earthquake Engineering and Structural Dynamics,2002,31(1):561-582.
[7]魏琏,王森,王志远,等.静力弹塑性分析方法的修正及其在抗震设计中的应用[J].建筑结构2,006,36(8):97-102.(Wei Lian,Wang Sen,Wang Zhiyuan,et al.Modification on nonlinear static analysis methodand application in seismic design of tall building[J].Building Structure,2006,36(8):97-102.(inChinese))
[8]Applied Technology Council.Seismic evaluation andretrofit of concrete building[R].Report ATC-40,California:ATC,1996.
[9]丰定国,王社良.抗震结构设计[M].武汉:武汉工业大学出版社,2000.(FENG Dingguo,WANGSheliang.Seismic design of structures[M].WuhanUniversity of Technology Press,2000.(in Chinese))
[10]Chopra A K.Dynamics of structures,theory andapplications to earthquake engineering[M].Beijing:Tsinghua University Press,2005.
[2]童岳生,梁兴文,辛力.钢筋混凝土结构抗震性能的设计谱曲线[J].建筑结构,2008,38(5):49-54.(Tong Yuesheng,Liang Xingwen,Xin Li.Designspectrum curve of seismic performance for reinforcedconcrete structure[J].Engineering Structure,2008,38(5):49-54.(in Chinese))
[3]翟长海,谢礼立.钢筋混凝土框架结构超强研究[J].建筑结构学报,2007,28(1):101-106.(ZHAIChanghai,XIE Lili.Study on overstrength RC framestructures[J].Journal of Building Structures,2007,28(1):101-106.(in Chinese))
[4]JGJ 3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2010.(JGJ 3—2010 Technical specification for concrete structures of tallbuilding[S].Beijing:China Architectures&BuildingPress,2010.(in Chinese))
[5]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.(GB 50010—2010 Code for design of concrete structures[S].Beijing:China Architectures&Building Press,2010.(inChinese))
[6]Chopra A K,Goel R.A modal pushover analysisprocedure for estimating seismic demands for buildings[J].Earthquake Engineering and Structural Dynamics,2002,31(1):561-582.
[7]魏琏,王森,王志远,等.静力弹塑性分析方法的修正及其在抗震设计中的应用[J].建筑结构2,006,36(8):97-102.(Wei Lian,Wang Sen,Wang Zhiyuan,et al.Modification on nonlinear static analysis methodand application in seismic design of tall building[J].Building Structure,2006,36(8):97-102.(inChinese))
[8]Applied Technology Council.Seismic evaluation andretrofit of concrete building[R].Report ATC-40,California:ATC,1996.
[9]丰定国,王社良.抗震结构设计[M].武汉:武汉工业大学出版社,2000.(FENG Dingguo,WANGSheliang.Seismic design of structures[M].WuhanUniversity of Technology Press,2000.(in Chinese))
[10]Chopra A K.Dynamics of structures,theory andapplications to earthquake engineering[M].Beijing:Tsinghua University Press,2005.
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