防屈曲支撑钢框架结构抗震性能分析
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摘要
防屈曲支撑是一种新型的耗能减震构件,能够显著提高结构的抗震性能。以云南省"校安工程"中的某小学为例,通过弹性以及弹塑性分析方法研究了安装防屈曲支撑的钢管混凝土结构的抗震性能。结果表明,随着支撑刚度的增加,结构的周期和层间位移角均有所减小;在小震作用下,防屈曲支撑处于弹性状态,为结构提供支撑刚度,在中震作用下,防屈曲支撑开始屈服耗能。结构的整体屈服是一个平稳渐变的过程,破坏模式为梁铰机制。
Buckling-restrained brace( BRB) is a new type of prospective energy dissipation component,which can improve the seismic performance of the structure. A primary school in Yunnan is taken for example,in this paper,to study the seismic behaviors of the concrete-filled steel tubular structures with BRB by elastic and elasto-plastic analysis. According to the analysis results,the story drift and the period of structures generally decrease as the stiffness of the brace increases. When subjected the frequent earthquakes,the BRB included in the structure are still in elastic state,and may provide stiffness for the main structure. When subjected the moderate earthquakes,quite a number of BRB are in postyielding state,and may provide the additional energy-dissipation capacity for the main structure. The overall structure possessed a stable and gradual capacity curve,and the failure modes of the structure are beam-hinge mechanism both in direction X and direction Y.
Buckling-restrained brace( BRB) is a new type of prospective energy dissipation component,which can improve the seismic performance of the structure. A primary school in Yunnan is taken for example,in this paper,to study the seismic behaviors of the concrete-filled steel tubular structures with BRB by elastic and elasto-plastic analysis. According to the analysis results,the story drift and the period of structures generally decrease as the stiffness of the brace increases. When subjected the frequent earthquakes,the BRB included in the structure are still in elastic state,and may provide stiffness for the main structure. When subjected the moderate earthquakes,quite a number of BRB are in postyielding state,and may provide the additional energy-dissipation capacity for the main structure. The overall structure possessed a stable and gradual capacity curve,and the failure modes of the structure are beam-hinge mechanism both in direction X and direction Y.
引文
[1]周云,唐荣,钟根全,王浩.防屈曲耗能支撑研究与应用的新进展[J].防灾减灾工程学报,2012,32(4):393-407.
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[3]汪家铭,中岛正爱,陆烨(译).屈曲约束支撑体系的应用与研究进展(I)[J].建筑钢结构进展,2005,7(1):1-12.
[4]李国强,孙飞飞,陈素文.大吨位国产TJII型屈曲约束支撑的研制与试验研究[J].建筑钢结构进展,2009,11(4):22-26.
[5]Federal emergency management agency.Prestandard and commentary for the seismic rehabilitation of buildings(FEMA 356),2000.
[6]孙建华,罗开海,王亚勇,白雪霜.含屈曲约束耗能支撑的高层建筑地震作用效应分析[J].工程抗震与加固改造,2007,29(4):1-8.
[2]陈建兴姜文伟穆为.Pushover分析在性能化抗震设计中的应用[J].结构工程师,2008,24(3):81-86.
[3]汪家铭,中岛正爱,陆烨(译).屈曲约束支撑体系的应用与研究进展(I)[J].建筑钢结构进展,2005,7(1):1-12.
[4]李国强,孙飞飞,陈素文.大吨位国产TJII型屈曲约束支撑的研制与试验研究[J].建筑钢结构进展,2009,11(4):22-26.
[5]Federal emergency management agency.Prestandard and commentary for the seismic rehabilitation of buildings(FEMA 356),2000.
[6]孙建华,罗开海,王亚勇,白雪霜.含屈曲约束耗能支撑的高层建筑地震作用效应分析[J].工程抗震与加固改造,2007,29(4):1-8.
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