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阻尼比对结构的地震反应有重要的影响,目前结构抗震设计阶段通常取阻尼比为常数,不能真实反映建筑物的阻尼机理。基于对钢筋混凝土建筑物非线性阻尼比的分析研究,通过数值分析,提出了建筑抗震设计反应谱的非线性阻尼比修正系数,建立了非线性阻尼比地震反应谱曲线。该曲线不仅考虑了设防烈度和场地条件对建筑物地震反应的影响,也可反映建筑物不同结构类型和结构振动过程中阻尼性能的变化对结构地震反应影响。非线性阻尼比地震反应谱曲线与现行建筑抗震设计规范中标准地震反应谱曲线之间能保持理论体系上的一致性,对工程设计具有一定的参考价值。
The damping ratio has an important influence on the seismic response of the structure. At present, the damping ratio is usually taken as a constant in the seismic design stage of the structure, and the damping mechanism of the building can not be truly reflected. Based on the analysis of the nonlinear damping ratio of reinforced concrete buildings, the nonlinear damping ratio correction coefficient of the seismic design response spectrum of the building was proposed by numerical analysis, and the seismic response spectrum curve of nonlinear damping ratio was established. The curve not only considers the influence of fortification intensity and site conditions on seismic response of buildings, but also reflects the influence of the change of damping performance on the seismic response of structures due to different types of structures and vibration of structures. The consistency of the theoretical system can be maintained between the non-linear damping ratio seismic response spectrum curve and the standard seismic response spectrum curve of the current building seismic design code, which is of certain reference value to engineering design.