带黏弹性阻尼器结构振动台试验设计与数值分析

Testing design and numerical analyses of shaking table test on structure added with viscoelastic dampers

本文基于某个三层带黏弹性阻尼器钢框架结构振动台试验,提出了带黏弹性阻尼器结构振动台试验设计和数值分析方法。试验设计包括输入地震动、试验工况、测点布置、阻尼器尺寸和布置方式的确定,核心内容为黏弹性阻尼器尺寸的选择;数值分析包括阻尼器力学模型、分析方法的确定以及减震效果的分析。本方法中,应用黏弹性阻尼器相似性理论可避免对一系列不同尺寸的阻尼器逐个进行性能试验而获得它们的滞回曲线,使用Bouc-Wen模型可较准确地对其进行参数识别,利用OpenSees非线性时程分析模拟不同尺寸阻尼器的试验过程,最后通过考察阻尼器的减震效果和最大应变确定阻尼器的尺寸。研究结果表明,本方法可以简单方便地确定合适的阻尼器尺寸,所提方法可使试验取得良好的减震效果。本文提出的试验设计和数值分析方法对于黏弹性阻尼器的研究和应用有一定参考价值。

The testing design and numerical analyses method of shaking table test on structure added with viscoelas- tic （VE） dampers are proposed, on the basis of an example of a 3-story steel frame added with VE dampers. Tes- ting design deals with the determinations of earthquake ground motions, loading cases, sensors placement, damper size and damper arrangement. Numerical analysis deals with the determinations of mechanical model, analytical method and control effect analysis of dampers. In the proposed methods, dampers with various sizes have no need to be tested one by one in order to obtain the hysteretic loops based on the similarity relations. The hysteretic loops can be well parametrically identified by Bouc-Wen model, and the shaking table test can be simulated by OpenS- ees. Finally the appropriate damper size can be determined through a comprehensive consideration of control effect and maximum strain of the dampers. The results indicate that the appropriate damper size can be conveniently de- termined and the control effect of VE dampers is good. The methods proposed in this paper will give significant ref- erence for the research and application of VE dampers.