- 摘 要
-
（1清華大學(xué)土木工程系， 北京 100084； 2 中冶建筑研究總院有限公司， 北京 100088）
［摘要］利用振動臺試驗，對附加黏滯型阻尼器的RC框架進(jìn)行附加阻尼比研究。共設(shè)計模擬小震到大震的11個工況，每組工況包括白噪聲掃頻、2個天然波和1個人工波激勵，利用結(jié)構(gòu)振動過程中的加速度響應(yīng)數(shù)據(jù)進(jìn)行動力參數(shù)識別，得到隨工況進(jìn)展、損傷累計的結(jié)構(gòu)自振頻率、阻尼比與振型等動力特征；同時，利用無阻尼器的對比框架振動試驗得到純框架部分的阻尼比，近似計算得到附加阻尼比的識別值；最后，利用應(yīng)變能法與強(qiáng)行解耦法以及振動時程數(shù)據(jù)、識別得到的結(jié)構(gòu)模態(tài)參數(shù)，對附加阻尼比進(jìn)行計算。計算結(jié)果與識別值的對比發(fā)現(xiàn)，在層間位移較大的情況下，應(yīng)變能法計算結(jié)果偏大，而強(qiáng)行解耦法結(jié)果偏小。
［關(guān)鍵詞］RC框架； 振動臺試驗； 滯型阻尼器； 附加阻尼比； 應(yīng)變能法； 強(qiáng)行解耦法
中圖分類號：TU352-1， TU311-41文獻(xiàn)標(biāo)識碼：A文章編號：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
*十三五國家重點(diǎn)研發(fā)計劃項目（2016YFC0701302）。
作者簡介：劉宇飛，博士，助理研究員，Email: liuyufei@tsinghua.edu.cn。
- 下載地址
-
