（1清华大学土木工程系， 北京 100084； 2 中冶建筑研究总院有限公司， 北京 100088）

［摘要］利用振动台试验，对附加黏滞型阻尼器的RC框架进行附加阻尼比研究。共设计模拟小震到大震的11个工况，每组工况包括白噪声扫频、2个天然波和1个人工波激励，利用结构振动过程中的加速度响应数据进行动力参数识别，得到随工况进展、损伤累计的结构自振频率、阻尼比与振型等动力特征；同时，利用无阻尼器的对比框架振动试验得到纯框架部分的阻尼比，近似计算得到附加阻尼比的识别值；最后，利用应变能法与强行解耦法以及振动时程数据、识别得到的结构模态参数，对附加阻尼比进行计算。计算结果与识别值的对比发现，在层间位移较大的情况下，应变能法计算结果偏大，而强行解耦法结果偏小。

［关键词］RC框架； 振动台试验； 滞型阻尼器； 附加阻尼比； 应变能法； 强行解耦法

中图分类号：TU352-1， TU311-41文献标识码：A文章编号：1002-848X(2019)08-0043-06

Shaking table test  study of a RC frame with viscous damper  

Liu Yufei1,2, Li Zhongyu2, Hui Yunling2, Guo Xiaohua2

(1 Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Central Research Institute of Building and Construction, MCC Group, Beijing 100088, China)

Abstract:The supplemental damping ratio of a RC frame with additional viscous dampers was studied using shaking table test. Totally 11 test conditions were designed and each condition includes the white noise excitation, two natural earthquake records and one artificial seismic wave. Modal identification was conducted using the acceleration response data  of structural vibration, and   the natural frequency, damping ratio and mode shape of the structure were extracted with the progress of the working condation and damage accumulation. Meanwhile, another tested RC frame without damper was excited under the same test conditions to obtain the basic damping ratio of the RC frame. With the identified damping ratio known, the supplemental damping ratio was calculated approximately. Finally the strain energy method and forcing decoupling method were employed to calculate the supplemental damping ratio using the time-history data and identified modal data. The comparison  results  show that when the story drift is large, the strain energy method is tending to produce larger supplemental damping ratio than the identified value, while the forcing decoupling method is just the opposite.

Keywords:RC frame; shaking table test; viscous damper; supplemental damping ratio; strain energy method; forcing decoupling method

*十三五国家重点研发计划项目（2016YFC0701302）。

作者简介：刘宇飞，博士，助理研究员，Email: liuyufei@tsinghua.edu.cn。