阻尼模型对混合结构地震耗能分析的影响
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摘要
本文采用14条地震波对3个不同阻尼模型下的钢框架-钢筋混凝土剪力墙混合结构进行动力时程分析,以了解不同阻尼模型对结构耗能分析的影响,结果表明:阻尼模型的选取对结构总输入能的计算影响不大,但对于滞回耗能在总输入能中所占比例(滞回耗能比)有很大影响。采用刚度比例和瑞雷阻尼模型进行地震耗能分析获得的滞回耗能比随结构自振周期的增大而减小,但质量比例阻尼模型的计算结果受结构周期影响不大;采用刚度比例阻尼模型计算获得的结构滞回耗能比与采用瑞雷阻尼模型相近,随着结构自振周期的增大,瑞雷阻尼模型会略大于刚度比例阻尼模型;采用质量比例阻尼模型计算获得的结构滞回耗能比最大,随着地震波峰值速度与峰值加速度比值(V/A)的增大,刚度比例和瑞雷阻尼模型的计算结果会与质量比例阻尼模型趋于一致。
A parametric study is presented on the influence of 3 mathematical modeling of viscous damping on seismic-energy dissipation analysis of steel framereinforced concrete shear wall systems to 14 ground motion records.The study shows that the input energy E_I is not affected by the type of damping model selected,but the ratio of hysteretic to input energy E_H/E_I is sensitive to the damping model.The E_H/ E_I ratio for the Rayleigh and stiffness-proportional damping model are decreased with the increase of fundamental period of structure T,and T has little influence on E_H/E_I for the mass-proportional damping model.The E_H/E_I ratio for the Rayleigh is little larger than the stiffness-proportional damping model,and the difference is increased with the T.The E_H/E_I ratio for the mass-proportional damping model is the biggest one,with the increase of peak ground velocity to acceleration ratio(V/A),the E_H/E_I ratio for the Rayleigh and stiffness-proportional damping model will be close to mass-proportional damping model.
A parametric study is presented on the influence of 3 mathematical modeling of viscous damping on seismic-energy dissipation analysis of steel framereinforced concrete shear wall systems to 14 ground motion records.The study shows that the input energy E_I is not affected by the type of damping model selected,but the ratio of hysteretic to input energy E_H/E_I is sensitive to the damping model.The E_H/ E_I ratio for the Rayleigh and stiffness-proportional damping model are decreased with the increase of fundamental period of structure T,and T has little influence on E_H/E_I for the mass-proportional damping model.The E_H/E_I ratio for the Rayleigh is little larger than the stiffness-proportional damping model,and the difference is increased with the T.The E_H/E_I ratio for the mass-proportional damping model is the biggest one,with the increase of peak ground velocity to acceleration ratio(V/A),the E_H/E_I ratio for the Rayleigh and stiffness-proportional damping model will be close to mass-proportional damping model.
引文
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[2]周云,徐彤,周福霖.抗震与减震结构的能量分析方法研究与应用.[J]地震工程与工程震动,1999,19(4):133~139.
[3]李国强,周向明,丁翔.钢筋混凝土剪力墙非线性动力分析模型[J].世界地震工程,2000,16(2):13~18.
[4]李国强,周昊圣,周向明.高层钢-混凝土混合结构弹塑性地震位移的工程实用计算[J].建筑结构学报,2003,24(1):40~45.
[5]Sucuoglu H,Nurtug A.Earthquake ground motioncharacteristics and seismic energy dissipation[J].EarthquakeEngineering&Structural Dynamics.1995,24(9):1195~1213.
[6]Leger P,Dussault S.Seismic-energy dissipation in MDOFstructures[J].J.Struct.Engrg,ASCE,1992,118(5),1251~1269.
[7]肖明葵.抗震结构总输入能量及其影响因素分析[J].重庆建筑大学学报,1996,18(2):20~33.
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