以实际工程案例为背景,分析在不同地震强度下黏滞阻尼器参数对结构附加阻尼比的影响,以及规范方法与能量比值法对附加阻尼比的计算差异。考虑阻尼系数、阻尼指数以及地震强度等因素,采用Etabs软件对案例进行参数分析。研究结果表明：不同强度地震下阻尼系数和阻尼指数与附加阻尼比的关系均呈抛物线状,先增大后减小,存在最优解,且随着地震强度增加,最优解参数变大;阻尼系数或指数较小时,多遇地震下阻尼比最大,阻尼系数或指数适中时,设防地震下阻尼比最大,阻尼系数或指数较大时,罕遇地震下阻尼比最大;楼层矮、扭转效应小或者地震强度小时规范方法计算的附加阻尼比大于能量比值法,而对于楼层高、扭转效应明显或者地震强度较大时二者的关系会随之发生改变。
Abstract
In this study, actual engineering cases serve as the background for analyzing the influence of viscous damper parameters on the additional damping ratio under different seismic intensities. The calculation differences of the additional damping ratio between the normative method and the energy ratio method are also examined. Taking into account factors such as damping coefficient, damping index and seismic intensity, parametric analysis is carried out using Etabs software. It was found that the relationship between the damping coefficient and damping index and the additional damping ratio under earthquakes of different intensities is parabolic, where it initially increases and then decreases. There exists an optimal solution, and as earthquake intensity increases, the optimal solution parameters become larger. When the damping coefficient or index is small, the damping ratio is maximum under frequent earthquakes. When moderate, it is maximum under design basis earthquakes,and when large is maximum under rare earthquakes. The normative method yields larger results than the energy ratio method when the floor is low, torsional effects are small, or seismic intensity is low, with the relationship between the two varying accordingly.
关键词
黏滞阻尼器 /
附加阻尼比 /
地震强度 /
规范法 /
能量比值法 /
无害位移
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Key words
viscous damper /
additional damping ratio /
seismic intensity /
normative method /
energy ratio method /
harmless displacement
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