规则框架结构Push-over方法的改进研究
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摘要
针对Push-over分析方法的特点,对等效单自由度提出了一种新的等效方法。主要假设施加于框架结构上的侧向分布荷载是动力荷载,因此可用等效侧向荷载代替动力平衡方程中的地震作用,直接利用基底剪力一顶点位移曲线,避免了一般等效方法中的转换过程;同时利用强度折减系数对弹性加速度反应谱进行折减,根据等效周期求出相应目标位移,避免了复杂的迭代过程;最后用该方法对一框架进行了分析计算。结果表明:该方法简单实用,对结构计算分析具有一定的参考价值。
A new equivalent non-liner single-degree-of-freedom system is proposed.The main assumption of this paper is that the masses of the frame are loaded with lateral external dynamic forces so that the equivalent dynamic forces can substitute the seismic demand.Thus the curve of base shear forces-top displacement diagram can be used directly and the conversion of the common equivalent method can be avoided;Besides,the iteration is avoided by reducing the elastic spectrum through the strength reduction factor and calculating the target displacement according to the equivalent period.Finally,this method is verified by a six-story regular frame system.The results show that,this method is simple and practical,and it has certain reference significances for structure analysis.
A new equivalent non-liner single-degree-of-freedom system is proposed.The main assumption of this paper is that the masses of the frame are loaded with lateral external dynamic forces so that the equivalent dynamic forces can substitute the seismic demand.Thus the curve of base shear forces-top displacement diagram can be used directly and the conversion of the common equivalent method can be avoided;Besides,the iteration is avoided by reducing the elastic spectrum through the strength reduction factor and calculating the target displacement according to the equivalent period.Finally,this method is verified by a six-story regular frame system.The results show that,this method is simple and practical,and it has certain reference significances for structure analysis.
引文
[1]GB50011-2010,建筑抗震设计规范[S]
[2]Zou X K,Chan C M.Optimal Seismic Performance-based Design of Reinforced Concrete Building Using Nonlinear Push-over Analysis[J].Engineering Structures,2005,27:1289~1302
[3]陈代果,姚勇,邓勇军,等.罕遇地震作用下HADAS加固某大跨度结构的静力弹塑性分析[J].铁道科学与工程学报,2012,(5):19~24
[4][美]克劳夫.王光远译.结构动力学[M].北京:科学出版社,1982
[5]沈聚敏,周锡元.抗震工程学[M].北京:中国建筑工业出版社,2000
[6]Chopra A K,Goel R K.Capacity-demand-diagram Methods for Estimating Seismic Deformation of Inelastic Structures:SDF Systems,Report NO.PEER-1992/02[R].Pacific Earthquake Engineering Research Center,University of California,Berkeley,1999
[7]Peter Fajfar.Capacity Spectrum Method Based on Inelastic Demand Spectra[J].Earthquake Engineering and Structural Dynamics,1999,28,979~993
[2]Zou X K,Chan C M.Optimal Seismic Performance-based Design of Reinforced Concrete Building Using Nonlinear Push-over Analysis[J].Engineering Structures,2005,27:1289~1302
[3]陈代果,姚勇,邓勇军,等.罕遇地震作用下HADAS加固某大跨度结构的静力弹塑性分析[J].铁道科学与工程学报,2012,(5):19~24
[4][美]克劳夫.王光远译.结构动力学[M].北京:科学出版社,1982
[5]沈聚敏,周锡元.抗震工程学[M].北京:中国建筑工业出版社,2000
[6]Chopra A K,Goel R K.Capacity-demand-diagram Methods for Estimating Seismic Deformation of Inelastic Structures:SDF Systems,Report NO.PEER-1992/02[R].Pacific Earthquake Engineering Research Center,University of California,Berkeley,1999
[7]Peter Fajfar.Capacity Spectrum Method Based on Inelastic Demand Spectra[J].Earthquake Engineering and Structural Dynamics,1999,28,979~993
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