基于改进迟滞阻尼模型的混合结构抗震分析SRSS法
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TU311.3

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国家自然科学基金(51578343)


SRSS method for seismic analysis of mixed structure based on improved hysteretic damping model
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    摘要:

    混合结构的阻尼矩阵不再满足经典阻尼条件,无法直接采用模态叠加法。迟滞阻尼模型具有每周期耗散能量与外激励频率无关的优点,且时域计算结果稳定收敛,但不满足能量守恒原则。利用结构每周期耗散能量与阻尼做功相等,对迟滞阻尼模型的阻尼系数进行修正,得到了改进迟滞阻尼模型,并提出了对应的混合结构模态叠加法。在此基础上,分析改进迟滞阻尼模型的反应谱特点,计算最不利地震作用效应组合,提出了基于改进迟滞阻尼理论的混合结构抗震分析SRSS法。算例分析表明,改进迟滞阻尼模型计算的地震作用效应比粘性阻尼模型计算的地震作用效应更大,其增大幅度约为15%~20%。

    Abstract:

    Damping matrix of mixed structure no longer satisfies the classical damping condition. In such a case, the modal superposition method may become invalid. The advantage of hysteretic damping model is that energy consumption is related to external excitation frequencies in each cycle. At the same time, the calculation results of time-domain are stable. However, it does not meet the principle of energy conservation. By the equivalence of energy dissipation and damping power in each cycle, damping coefficient of hysteresis damping model can be modified. Subsequently, an improved hysteretic damping model and its own modal superposition method of mixed structure are proposed in this paper. The characteristics of improved hysteretic damping model response spectrum are firstly analyzed. Then, the most unfavorable combination of seismic effects could be calculated. Based on the improved hysteretic damping model, SRSS method for seismic analysis of mixed structure is performed. Results show that seismic effects of the improved hysteretic damping model are more significant than that of viscous damping model, and the increase is about 15%~20%.

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孙攀旭,杨红,刘庆林.基于改进迟滞阻尼模型的混合结构抗震分析SRSS法[J].土木与环境工程学报(中英文),2019,41(2):93-98. Sun Panxu, Yang Hong, Liu Qinglin. SRSS method for seismic analysis of mixed structure based on improved hysteretic damping model[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2019,41(2):93-98.10.11835/j. issn.2096-6717.2019.034

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  • 收稿日期:2018-05-12
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  • 在线发布日期: 2019-04-30
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