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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Appropriate viscous damping for nonlinear time-history analysis of base-isolated reinforced concrete buildings
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Appropriate viscous damping for nonlinear time-history analysis of base-isolated reinforced concrete buildings

机译：适当的粘滞阻尼用于基础隔震钢筋混凝土建筑物的非线性时程分析

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摘要

There is no consensus at the present time regarding an appropriate approach to model viscous damping in nonlinear time-history analysis of base-isolated buildings because of uncertainties associated with quantification of energy dissipation. Therefore, in this study, the effects of modeling viscous damping on the response of base-isolated reinforced concrete buildings subjected to earthquake ground motions are investigated. The test results of a reduced-scale three-story building previously tested on a shaking table are compared with three-dimensional finite element simulation results. The study is primarily focused on nonlinear direct-integration time-history analysis, where many different approaches of modeling viscous damping, developed within the framework of Rayleigh damping are considered. Nonlinear direct-integration time-history analysis results reveal that the damping ratio as well as the approach used to model damping has significant effects on the response, and quite importantly, a damping ratio of 1% is more appropriate in simulating the response than a damping ratio of 5%. It is shown that stiffness-proportional damping, where the coefficient multiplying the stiffness matrix is calculated from the frequency of the base-isolated building with the post-elastic stiffness of the isolation system, provides reasonable estimates of the peak response indicators, in addition to being able to capture the frequency content of the response very well. Furthermore, nonlinear modal time-history analyses using constant as well as frequency-dependent modal damping are also performed for comparison purposes. It was found that for nonlinear modal time-history analysis, frequency-dependent damping, where zero damping is assigned to the frequencies below the fundamental frequency of the superstructure for a fixed-base condition and 5% damping is assigned to all other frequencies, is more appropriate, than 5% constant damping.
机译：由于存在与能量耗散量化相关的不确定性，目前对于在基础隔震建筑物的非线性时间历史分析中采用适当的方法对粘滞阻尼进行建模尚无共识。因此，在这项研究中，研究了粘滞阻尼建模对地震作用下基础隔震钢筋混凝土建筑物响应的影响。将先前在振动台上测试过的缩小规模的三层建筑的测试结果与三维有限元模拟结果进行了比较。该研究主要集中于非线性直接积分时程分析，其中考虑了在瑞利阻尼框架内开发的许多不同的粘性阻尼建模方法。非线性直接积分时程分析结果表明，阻尼比以及用于建模阻尼的方法对响应具有显着影响，非常重要的是，在模拟响应时，阻尼比阻尼更合适的是1％比例为5％。结果表明，除了基础系统的频率与基础隔震系统的弹性后刚度外，刚度比例阻尼还可以提供合理的峰值响应指标估计值，其中系数乘以刚度矩阵即可能够很好地捕获响应的频率内容。此外，还进行了使用常数以及依赖于频率的模态阻尼的非线性模态时程分析，以进行比较。我们发现，对于非线性模态时程分析，频率相关的阻尼是零，在固定基础条件下，零阻尼被分配给上层建筑基础频率以下的频率，而5％阻尼被分配给所有其他频率。比5％恒定阻尼更合适。

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