底部框架结构中铅阻尼器的应用
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摘要
采用一种新型的抗震技术——结构被动控制,针对底部框架结构设计一种构造简单、施工方便、耐久性好的剪切型阻尼器——铅阻尼器。通过抗震性能试验研究,从滞回曲线图形可以看出滞回环较为丰满,是一种较好的耗能器。采用大型通用有限元ANSYS软件对某5层底部框架结构进行有限元整体分析,通过对原结构及安置了阻尼器的结构进行比较,结果表明:①铅剪切阻尼器弹性刚度很大,屈服位移很小。屈服后,随位移增加,刚度明显降低,体现明显的塑性性质,滞回环较为丰满;②设置阻尼器的结构比原结构的水平位移减小了约33.3%～44%;加速度减小约31%～52%;③从底部剪切时程曲线的比较可以看出,设置阻尼器的结构比原结构的底部剪切减小了约40%;④设置该铅阻尼器后,铅阻尼器能产生较强的控制力,显著改善结构软弱层的控制能力,减弱传统结构上的地震作用,达到了对结构振动控制的目的。
A new anti-seismic technology,the passive control of the structure,is used in the base frame structure.A shear damper-the leaded damper which has the good features of the simple structure,the convenient construction and durability is designed.In the experiment on the leaded damper's ability,the stagnating circle is full through the stagnating curve,it proves that the leaded damper is a good energy dissipater.A finite element analysis of a five floors in the base frame structure is exampled using ANSYS.The theory of time-history analysis to the seismic response of the base frame structure and the lead damper installment structure shows:① the elastic stiffness of shear damper-leaded damper is large,the yield displacement is small,post yield,with increasing displacement,stiffness decreased which reflects a clear plastic nature;② the level displacement in comparison is reduced about 33.3%~44%,the acceleration is reduced about the percent of 31%~52%;③ the base floor shear forces is reduced about 40% through the time-history curves of base floor shear forces;and ④ the leaded damper can make strong control in the process of energy-dissipation,significantly improve the structure of weak floors of the seismic capacity and reduce the spread of the earthquake action on masonry structures so as to achieve the purpose of dynamic control.
A new anti-seismic technology,the passive control of the structure,is used in the base frame structure.A shear damper-the leaded damper which has the good features of the simple structure,the convenient construction and durability is designed.In the experiment on the leaded damper's ability,the stagnating circle is full through the stagnating curve,it proves that the leaded damper is a good energy dissipater.A finite element analysis of a five floors in the base frame structure is exampled using ANSYS.The theory of time-history analysis to the seismic response of the base frame structure and the lead damper installment structure shows:① the elastic stiffness of shear damper-leaded damper is large,the yield displacement is small,post yield,with increasing displacement,stiffness decreased which reflects a clear plastic nature;② the level displacement in comparison is reduced about 33.3%~44%,the acceleration is reduced about the percent of 31%~52%;③ the base floor shear forces is reduced about 40% through the time-history curves of base floor shear forces;and ④ the leaded damper can make strong control in the process of energy-dissipation,significantly improve the structure of weak floors of the seismic capacity and reduce the spread of the earthquake action on masonry structures so as to achieve the purpose of dynamic control.
引文
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[2]张同忠.粘滞阻尼器和铅阻尼器的理论与试验研究[D].北京:北京工业大学学报,2004(ZhangTongzhong.Theoryandexperimental study of viscous and leader dampers[D].Beijing:Beijing University of Technology,2004(in Chinese))
[3]Lai M L,Lu P,Lunsford D A,et al.Viscoelastic damper:a damper with linear or nonlinear materia[lC]//Proceedingsof 11th World Conference on Earthquake Engineering.Mexico,1996
[4]Samali B,Kwok K C S.Use of viscoelastic dampers inreducing wind and earthquake induced motion of buildingstructure[sJ].Engineering Structures,1995,17(9):639-654
[5]王铁英,王艳武,王焕定,等.两类铅阻尼器的滞回性能研究[J].世界地震工程,2005,21(1):134-139(WangTieying,Wang Yanwu,Wang Huanding,et al.Research onhysteretic characteristics of two kinds of vertical lead dampers[J].World Information on Earthquake Engineering,2005,21(1):134-139(in Chinese))
[6]何政,欧进萍.钢筋混凝土结构非线性分析[M].哈尔滨:哈尔滨工业大学出版社,2006
[7]Yao J T P.Concept of structure control[J].Journal of theStructural Division,1972,98(7):1567-1574
[8]周福霖.工程结构减震控制[M].北京:地震出版社,1997
[2]张同忠.粘滞阻尼器和铅阻尼器的理论与试验研究[D].北京:北京工业大学学报,2004(ZhangTongzhong.Theoryandexperimental study of viscous and leader dampers[D].Beijing:Beijing University of Technology,2004(in Chinese))
[3]Lai M L,Lu P,Lunsford D A,et al.Viscoelastic damper:a damper with linear or nonlinear materia[lC]//Proceedingsof 11th World Conference on Earthquake Engineering.Mexico,1996
[4]Samali B,Kwok K C S.Use of viscoelastic dampers inreducing wind and earthquake induced motion of buildingstructure[sJ].Engineering Structures,1995,17(9):639-654
[5]王铁英,王艳武,王焕定,等.两类铅阻尼器的滞回性能研究[J].世界地震工程,2005,21(1):134-139(WangTieying,Wang Yanwu,Wang Huanding,et al.Research onhysteretic characteristics of two kinds of vertical lead dampers[J].World Information on Earthquake Engineering,2005,21(1):134-139(in Chinese))
[6]何政,欧进萍.钢筋混凝土结构非线性分析[M].哈尔滨:哈尔滨工业大学出版社,2006
[7]Yao J T P.Concept of structure control[J].Journal of theStructural Division,1972,98(7):1567-1574
[8]周福霖.工程结构减震控制[M].北京:地震出版社,1997
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