结构附加粘滞阻尼器的抗震设计

Seismic Design of Supplemental Viscous Dampers to Structure

本文结合抗震设计规范反应谱,给出了一个附加非线性流体粘滞阻尼器结构的抗震设计方法。研究了非线性阻尼器的力学特性,引入了非线性流体阻尼器的等效线性阻尼比,给出了计算最大加速度时刻附加非线性流体阻尼器结构反应的荷载组合系数,提出了按阻尼力的水平力分量与楼层剪力成正比的原则分配阻尼器阻尼系数的方法。同时给出了基于抗震规范设计反应谱附加非线性阻尼器结构的设计流程,通过一个算例说明了使用该方法设计附加非线性粘滞阻尼器结构的全过程。算例分析表明,这种设计方法适合于手算,便于设计人员掌握,在初步设计阶段可以快速、有效地设计满足给定性能水平的附加非线性流体阻尼器体系。

This paper presents a seismic design method for existing buildings equipped with nonlinear fluid viscous dampers （FVD）. Mechanical properties of nonlinear FVD are first investigated. Equivalent linear viscous damping ratio provided by nonlinear FVD installed in buildings is introduced. Load combination factors used for evaluation the response of the supplemental damping systems at the stage of the maximum acceleration are given. A simple design procedure for building incorporating nonlinear FVD is proposed based on Chinese design response spectrum, in which the damping coefficient of damper is determined according to the principle that the horizontal component of the damper force is proportional to the corresponding story shear force demand. The application of the simple procedure is illustrated using an example. It is demonstrated that the presented method is effective and straight forward for design of buildings with nonlinear FVD, particularly at the stage of preliminary design.