城市高架桥半封闭式声屏障的车致振动试验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (16) : 14-21.

论文

谢伟平1，余华彬1，孙亮明1，胡喆2，赵寒冰 1

作者信息 +

Experimental investigation on train-induced vibrations of a semi-closed noise barrier on the urban viaduct

XIE Weiping1,YU Huabin1,SUN Liangming1,HU Zhe2，ZHAO Hanbing1

Author information +

文章历史 +

摘要

为研究地铁列车低速通过时高架桥上半封闭式声屏障的振动响应及传播规律，对某城市轨道交通高架桥上的半封闭式声屏障进行了试验研究。基于实测数据，分析了高架桥和声屏障的动力特性、地铁列车过桥时的激励特性以及半封闭式声屏障的振动响应特征，并讨论了列车速度对高架桥上半封闭式声屏障车致振动的影响。结果表明：地铁列车低速过桥时具有“移动轴重激励”的荷载特性；声屏障的振动相对于桥面轨道板有显著的放大效应，其立柱顶端的各向加速度响应相当，但纵向振动稍大，其亚克力板的横向振动相对于其立柱的也明显增大；此外，地铁列车在正常运营情况下，不同车速对高架桥和声屏障的振动加速度级影响一般在5dB以内，且主要表现为列车轴距加载频率处振动分量幅值的变化。

Abstract

In order to investigate the vibration responses and its propagation law of a semi-closed noise barrier on the urban viaduct when a subway train is slowly passing through, field measurements are performed for the semi-closed noise barrier on the viaduct of a certain urban rail transit.Based on the measured data, the dynamic characteristic and vibration response of the semi-closed noise barrier on the viaduct as well as the excitation characteristic of subway train were analyzed.Finally, the influence of train speed for the train-induced vibrations was also been discussed.The results show that the amplitudes of predominant components of train loads excited by slowly passing train fluctuate in accordance with the moving of train bogies.The vertical, lateral, and longitudinal acceleration responses on the top of H-shaped steel column approach to each other while the longitudinal one is slightly greater, but they are all more prominent than the responses of track slab.It is shown that the vibration response of acrylic board is usually severer than that of H-shaped steel column especially in the lateral direction.In addition, the vibration acceleration level differences of the structure between different train speeds are generally lower than 5 dB when the subway train is travelling at the operation speed.And the speed of train mainly affects the amplitude of vibration component excited by the periodic loading of wheelsets in the frequency domain.

导出引用

谢伟平1，余华彬1，孙亮明1，胡喆2，赵寒冰 1 . 城市高架桥半封闭式声屏障的车致振动试验研究[J]. 振动与冲击, 2019, 38(16): 14-21

XIE Weiping1,YU Huabin1,SUN Liangming1,HU Zhe2，ZHAO Hanbing1. Experimental investigation on train-induced vibrations of a semi-closed noise barrier on the urban viaduct[J]. Journal of Vibration and Shock, 2019, 38(16): 14-21

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