刘艳辉, 赵世春, 强士中. 阻尼比对延性需求谱的影响[J]. 工程力学, 2011, 28(5): 200-206.
引用本文: 刘艳辉, 赵世春, 强士中. 阻尼比对延性需求谱的影响[J]. 工程力学, 2011, 28(5): 200-206.
LIU Yan-hui, ZHAO Shi-chun. THE DAMPING RATIO INFLUENCE ON DUCTILITY DEMAND SPECTRUM[J]. Engineering Mechanics, 2011, 28(5): 200-206.
Citation: LIU Yan-hui, ZHAO Shi-chun. THE DAMPING RATIO INFLUENCE ON DUCTILITY DEMAND SPECTRUM[J]. Engineering Mechanics, 2011, 28(5): 200-206.

阻尼比对延性需求谱的影响

THE DAMPING RATIO INFLUENCE ON DUCTILITY DEMAND SPECTRUM

  • 摘要: 阻尼比取值差异必然对结构响应计算结果产生影响。该文在PEER强震记录库中选择了434条水平向地震记录,并将其按我国现行抗震设计规范进行场地类别和设计地震分组的划分,对阻尼比为0.02、0.04、0.06、0.08、0.10的单自由度结构体系,进行弹塑性时程分析,得到了在不同阻尼比取值时,考虑不同场地类别和设计地震分组的阻尼比影响系数曲线。分析结果表明:阻尼比影响系数随结构屈服强度系数的变化不显著,屈服强度系数对阻尼比影响系数的影响可以忽略;阻尼比系数与结构的自振周期近似成直线关系,取值基本在0.75―1.25之间变化;阻尼比影响系数存在不敏感区,不敏感区的自振周期的分布范围受场地类别和设计地震分组的影响。最后,通过非线性回归分析,提出了在不同场地类别和地震动特征周期下的阻尼比影响系数取值的函数表达式。

     

    Abstract: Different damping ratio values must induce different outcomes of structural responses. In this paper, 434 horizontal seismic records are selected from PEER strong ground motion record database, and are divided according to the soil conditions (SC) and the design characteristic periods (DCP) in the Chinese current seismic design code. The elastic-plastic time-history analysis is carried out for a single degree-freedom structural system when the damping ratio values are 0.02,0.04,0.06,0.08, 0.10 respectively. The damping ratio influence factor curves are obtained under different damping ratios, different SC and different DCP. The results show that the change of damping ratio influence factors is not remarkable along with the change of yield strength coefficient, it could be ignored in design; an approximate linear relationship is showed between the damping ratio influence factor and natural periods of the structure , damping ratio influence factor values changes between 0.75―1.30; the insensitive regions of damping ratio influence factor are existence, and its distribution is influenced by the SC and DCP. Finally, by a non-linear regression analysis, the expressions of the damping ratio influence factors are presented under different SC and DCP.

     

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