高架桥上半封闭声屏障的车桥耦合振动分析

Vehicle-bridge Coupling Vibration Analysis of Semi-closed Sound Barrier on the Viaduct

以某城市高架桥上半封闭式声屏障为工程背景,基于车桥耦合振动理论建立了地铁列车-高架桥/声屏障相互作用系统的振动分析模型,进行了半封闭式声屏障的耦合振动分析。结果表明,不同于箱梁以竖向振动为主,声屏障的竖向和横向振动都较大,其中横向振动较箱梁明显放大,其幅值总体上随高度增加而增大。行车方向不同时对声屏障的位移响应影响较大,尤其敞开侧行车时结构横向位移比封闭侧行车时要大。行车速度不同时声屏障同一侧竖向位移和同一高度横向位移的变化规律基本一致。

Based on the coupled vibration theory of the vehicle-bridge interaction,a vibration analysis model of the subway train-elevated bridge/sound barrier interaction system was established,with a semi-enclosed sound barrier on a certain city's elevated bridge as the engineering background.The coupled vibration analysis of the semi-enclosed sound barrier was conducted.The results show that unlike box girders,the vertical and horizontal vibrations of the sound barrier are both intense,with the latter being significantly amplified compared to box girders.The amplitude of the horizontal vibration increases with height.The different driving directions have a great impact on the displacement response of the sound barrier,especially the lateral displacement of the structure when driving on the open side is greater than that when driving on the closed side.The vertical displacement of the same side of the sound barrier and the horizontal displacement of the same height at different driving speeds exhibit a similar changing trend.