A model test study on controlling vibration of an elevated track box girder structure with TMD
ZHANG Xinya1,LEI Xiaoyan2,LUO Kun2
1.Guangzhou Metro Design and Research Institute Co., Ltd., Guangzhou 510010, China;
2.MOE Engineering Research Center of Railway Environment Vibration and Noise, East China Jiaotong University, Nanchang 330013, China
Abstract:The vibration and noise problems of elevated track bridge structure have become an important factor restricting the development of railway traffic.In order to study the damping effect of tuned mass damper (TMD) on an elevated track box girder structure, taking the 32 m simple supported box girder bridge as the prototype, with 10 ∶1 as geometric scale.According to the scale ratio, a similar model of the track box girder structure was designed and fabricated, and the TMD vibration damping device was designed and manufactured according to the working principle of TMD.On the basis of verifying the reliability of the test model, the TMD damping device for controlling the first and second-order modal vibration were installed.The vibration response of measuring points on the structure was obtained by a single-point excitation test on the model bridge.Damping performance of TMD for the box girder bridge was analyzed.The results show that before the 1st and 2nd order TMDs were installed, the vibration response showed a significant peak near the modal natural frequency.After the TMD is installed, the effective acceleration value of the flange and web plate is significantly suppressed near the modal frequency, and the closer the excitation frequency is to the natural frequency, the better the TMD vibration reduction effect.Vibration reduction effect is better than 0.01 when TMD mass ratio is 0.02.
张新亚,雷晓燕,罗锟. TMD控制高架轨道箱梁结构振动的模型试验研究[J]. 振动与冲击, 2021, 40(16): 220-226.
ZHANG Xinya,LEI Xiaoyan,LUO Kun. A model test study on controlling vibration of an elevated track box girder structure with TMD. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(16): 220-226.
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