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在消能减震设计中,附加阻尼比直接影响到地震影响系数的大小,也是评价消能减震方案的重要宏观指标。针对现有的由结构响应计算附加阻尼比的方法存在计算繁琐且不够准确等不足,将随机减量法运用在消能结构阻尼比的计算中,即从结构的地震响应信号中提取自由振动衰减信号,从而很方便地利用对数衰减法确定消能结构的阻尼比。算例结果表明,该法可以近似地分析减震结构耗能随振动强度和时间的变化。最后采用工程实例介绍消能减震结构的分析以及阻尼比的计算方法,并通过其来评价两种消能方案,从而为消能减震结构设计提供参考。由随机减量法计算得到的阻尼比作为一个重要评价指标可以在今后的设计中应用。
In the design of energy dissipation and damping, the additional damping ratio directly affects the magnitude of the earthquake influence coefficient, which is also an important macro index to evaluate the energy dissipation and damping scheme. Aiming at the existing problems of calculating the additional damping ratio from the structural response, such as the calculation is complicated and not accurate enough, the random decrement method is used in the calculation of the damping ratio of the energy dissipation structure, that is, the free vibration attenuation is extracted from the seismic response signal of the structure Signal, so it is very convenient to use logarithmic decay method to determine the damping ratio of energy dissipation structure. The experimental results show that this method can approximate the change of energy dissipation with vibration intensity and time of the shock-absorbing structure. Finally, the engineering example is introduced to analyze the structure of energy dissipation and damping and the calculation method of damping ratio, and two kinds of energy dissipation schemes are evaluated to provide reference for energy dissipation structure design. The damping ratio calculated by random decrement method can be used in the future design as an important evaluation index.