某博物馆结构防屈曲支撑减震分析
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摘要
防屈曲支撑(BRB)作为一种金属屈服耗能支撑构件,克服了普通支撑受压屈曲的缺点,在地震中具有良好的耗能能力和延性。针对某实际博物馆工程加普通钢支撑的原方案和替换为防屈曲支撑后的加固方案,分别分析在小震和大震作用下结构的柱顶加速度、柱底力和层间变形等指标,对比两种加固方案的效果。结果表明,在小震下,防屈曲支撑相当于普通支撑,仅为结构提供侧向刚度,减少结构侧向变形和柱底内力;在大震下,防屈曲支撑具有良好的滞回性能,有效限制了楼层最大位移和最大加速度,其综合性能明显优于普通支撑。
As a kind of energy dissipation brace members by the yielding of mental,Buckling Restrained Brace( BRB)can overcome shortcomings of the common braces' compression buckling,which has good energy dissipation capacity and ductility in earthquake. This paper aims at an actual museum engineering's original scheme and the reinforcement scheme which adds ordinary steel braces and BRB respectively,and analyses the top of pillars' acceleration,columns' bottom stresses and interlayer deformation in small and strong earthquakes,then compares the two reinforcement schemes' effects. The results show that,in small earthquake,BRB can only provide lateral stiffness for structure,which is equivalent to the ordinary braces,it also reduce structure's lateral deformation and shear stress in the bottom of column; in strong earthquake,BRB has good hysteretic energy dissipation capacity,which limits the floor's maximal displacement and maximum acceleration effectively,its comprehensive performance is superior to the ordinary braces.
As a kind of energy dissipation brace members by the yielding of mental,Buckling Restrained Brace( BRB)can overcome shortcomings of the common braces' compression buckling,which has good energy dissipation capacity and ductility in earthquake. This paper aims at an actual museum engineering's original scheme and the reinforcement scheme which adds ordinary steel braces and BRB respectively,and analyses the top of pillars' acceleration,columns' bottom stresses and interlayer deformation in small and strong earthquakes,then compares the two reinforcement schemes' effects. The results show that,in small earthquake,BRB can only provide lateral stiffness for structure,which is equivalent to the ordinary braces,it also reduce structure's lateral deformation and shear stress in the bottom of column; in strong earthquake,BRB has good hysteretic energy dissipation capacity,which limits the floor's maximal displacement and maximum acceleration effectively,its comprehensive performance is superior to the ordinary braces.
引文
[1]Wakabayashi M.Experimental study of elastic-plastic properties of precast concrete wall panels with built-in insulating braces[C]//Proceedings of the Summaries of Technical Papers of Annual Meeting.Tokyo,1973
[2]Kimura K,Yoshioka K,Takada T,et al.Tests on braces encased by mortar in-filled steel tubes[C]//Summaries of Technical Papers of Annual Meeting.Japan,1976
[3]杨昌民,牧野俊雄,李宏男.防屈曲支撑的研究进展及其工程应用[J].建筑科学与工程学报,2011,28(4):76-78(Yang Changmin,Toshio M,Li Hongnan.Research progress and its engineering application of bucklingrestrained brace[J].Journal of Architecture and Civil Engineering,2011,28(4):76-78(in Chinese))
[4]郝贵强,杜永山,齐建伟.防屈曲支撑(BRB)在抗震加固工程中的应用[J].建筑结构,2010,40:3(Hao Guiqiang,Du Yongshan,Qi Jianwei.The application of buckling-restrained braces(BRB)on earthquake resistant engineering and retrofitting[J].Building Structure,2010,40:3(in Chinese))
[5]贾明明,张素梅,吕大刚,等.抑制屈曲支撑布置原则对钢框架抗震性能的影响[J].工程力学,2009,26(7):141-146(Jia Mingming,Zhang Sumei,Lu Dagang,et al.Influence of layout principle of buckling-restrained braces on seismic performance of steel frame[J].Engineering Mechanics,2009,26(7):141-146(in Chinese))
[6]周建龙,汪大绥,姜文伟,等.防屈曲耗能支撑在世博中心工程中的应用研究[J].建筑结构,2009,39(5):30-31(Zhou Jianlong,Wang Dasui,Jiang Wenwei,et al.Research on application of buckling res trained braces in the EXPO Center[J].Building Structure,2009,39(5):30-31(in Chinese))
[2]Kimura K,Yoshioka K,Takada T,et al.Tests on braces encased by mortar in-filled steel tubes[C]//Summaries of Technical Papers of Annual Meeting.Japan,1976
[3]杨昌民,牧野俊雄,李宏男.防屈曲支撑的研究进展及其工程应用[J].建筑科学与工程学报,2011,28(4):76-78(Yang Changmin,Toshio M,Li Hongnan.Research progress and its engineering application of bucklingrestrained brace[J].Journal of Architecture and Civil Engineering,2011,28(4):76-78(in Chinese))
[4]郝贵强,杜永山,齐建伟.防屈曲支撑(BRB)在抗震加固工程中的应用[J].建筑结构,2010,40:3(Hao Guiqiang,Du Yongshan,Qi Jianwei.The application of buckling-restrained braces(BRB)on earthquake resistant engineering and retrofitting[J].Building Structure,2010,40:3(in Chinese))
[5]贾明明,张素梅,吕大刚,等.抑制屈曲支撑布置原则对钢框架抗震性能的影响[J].工程力学,2009,26(7):141-146(Jia Mingming,Zhang Sumei,Lu Dagang,et al.Influence of layout principle of buckling-restrained braces on seismic performance of steel frame[J].Engineering Mechanics,2009,26(7):141-146(in Chinese))
[6]周建龙,汪大绥,姜文伟,等.防屈曲耗能支撑在世博中心工程中的应用研究[J].建筑结构,2009,39(5):30-31(Zhou Jianlong,Wang Dasui,Jiang Wenwei,et al.Research on application of buckling res trained braces in the EXPO Center[J].Building Structure,2009,39(5):30-31(in Chinese))
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