地震作用下工业厂房高低跨伸缩缝处碰撞反应分析
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摘要
针对工业厂房高低跨在地震作用下伸缩缝处的碰撞现象,采用非线性时程积分法,研究了地震作用下工业厂房高低相邻跨结构的非同向振动特性和伸缩缝处的碰撞效应.通过对刚体碰撞模型分析,推导出阻尼常数与恢复系数间的关系表达式,在此基础上建立了厂房高低相邻跨结构伸缩缝处的碰撞模型,并对伸缩缝间隙、相邻跨周期参数进行了影响分析.分析结果表明:当相邻高低跨结构周期相差较大时,会导致伸缩缝处相邻高低跨结构较大的相对位移和碰撞,碰撞导致低跨结构地震反应增大;伸缩缝间隙大小对碰撞力影响较大,但对结构位移的影响不是很明显.
Based on pounding phenomenon at expansion joints of high-low-span industry structures under earthquakes,nonlinear time-history integration method is employed to study the characteristics of out-of-phase vibrations and pounding effects of adjacent high-low-span industry structures at expansion joints.The relational expression between damping constant and resuming coefficient is deduced based on a rigid-body pounding model.The pounding model of pounding under earthquakes is presented.Effects of the gap distance and the differences in the periods of adjacent structures are analyzed.The results indicate that strong erthquakes can lead to large relative displacements and pounding of adjacent structures at expansion joints due to the differences in the periods of adjacent structures.The pounding amplifies the responses of low-span structure.Furthermore,pounding force rises with increase in gap distance,but the structurale displacement response change is not obvious.
Based on pounding phenomenon at expansion joints of high-low-span industry structures under earthquakes,nonlinear time-history integration method is employed to study the characteristics of out-of-phase vibrations and pounding effects of adjacent high-low-span industry structures at expansion joints.The relational expression between damping constant and resuming coefficient is deduced based on a rigid-body pounding model.The pounding model of pounding under earthquakes is presented.Effects of the gap distance and the differences in the periods of adjacent structures are analyzed.The results indicate that strong erthquakes can lead to large relative displacements and pounding of adjacent structures at expansion joints due to the differences in the periods of adjacent structures.The pounding amplifies the responses of low-span structure.Furthermore,pounding force rises with increase in gap distance,but the structurale displacement response change is not obvious.
引文
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[10]ROBERTJ K,KRZYSZTOF W,YOZO F.Reductionof pounding effects in elevated bridges during earth-quakes[J].Earthquake Engineering and Structural Dy-namics,2000,29:195-212.
[2]唐曹明.解决已有建筑物地震时碰撞问题的几点讨论[J].建筑结构学报,2001,22(1):76-78.
[3]STAVROS A,ANAG N.Equivalent viscous dampingfor modeling inelastic impacts in earthquake poundingproblems[J].Earthquake Engineering and StructuralDynamics,2004,33:897-902.
[4]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.
[5]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,39(1):54-59.
[6]吴乃森,王元生,何涛.大跨度钢筋混凝土拱桥地震反应分析[J].郑州大学学报:工学版,2009,30(3):30-34.
[7]秦志英,陆启韶.基于恢复系数的碰撞过程模型分析[J].动力学与控制学报,2006,4(4):294-298.
[8]MANDER J B,PRIESTLY MJ N,PARK R.Theoreti-cal stress strain model for confined concrete[J].Jour-nal of Structural Engineer ASCE,1988,114(8):123-129.
[9]PRAVEEN K M.Dynamics of seismic pounding at ex-pansion joints of concrete bridges[J].Journal of Engi-neering Mechanics ASCE,1998,124(7):181-187.
[10]ROBERTJ K,KRZYSZTOF W,YOZO F.Reductionof pounding effects in elevated bridges during earth-quakes[J].Earthquake Engineering and Structural Dy-namics,2000,29:195-212.
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