粘滞阻尼器与金属屈服耗能器的设计参数与性能比较

Design parameters and performance comparison of viscous dampers and metallic yield dampers

非线性粘滞阻尼器和无粘结支撑等金属屈服耗能器是今后结构抗震设计与加固的主要手段之一.针对这两类耗能装置,根据基本的模型参数将非线性的耗能特性转化为线性条件下的等效阻尼比,考察各基本参数的影响情况和合理的参数值,并分析了框架剪力比等结构设计中的重要参数.再通过单自由度系统的动力时程计算,分析了阻尼耗能与滞回耗能的能量耗散情况.结果表明,金属屈服耗能器一定程度上改变了结构的动力特性,能显著减小结构的总能量输入,并减小对结构的延性需求,在等效阻尼比接近的情况下具有比粘滞阻尼器更突出的耗能性能.

Nonlinear viscous dampers and metallic yield dampers （steel buckling-restrained bracing, et al）, are ones of most important ways of structural seismic-resistance design and retrofitting in future. This paper establishes the models and its primary parameters of these two dampers and achieves their equivalent damping ratios from nonlinear characteristic of energy dissipation, and other important parameters in structural design, such as shear ratio of frame, are studied. Then time-history analyses due to strong ground motion are conducted for a single degree of freedom system installed with metallic yield dampers and viscous dampers. The results show that metallic yield damper could change the dynamic characteristic of structural system in a certain extent and remarkably reduce the total input energy and ductility demands. It＇s performance of energy dissipation is greatly better than that of viscous dampers when their equivalent damping ratios are equal.