Citation: | WEI Xing, ZHANG Jing, WEI Huanbo, HU Zhe, WEN Zongyi. Structural Effect on Mechanical Behavior of High-Speed Railway Sound Barriers Based on Vibration Response[J]. Journal of Southwest Jiaotong University, 2022, 57(2): 353-359, 409. doi: 10.3969/j.issn.0258-2724.20200243 |
In order to study the mechanical behavior of different forms of enclosed sound barriers under wind pressure generated by high-speed trains, taking a high-speed rail sound barrier as the research object, global models for the double-sided enclosed sound barrier structure with different top opening spacing and for the single-sided enclosed sound barrier structure with different top covering lengths were established using the finite element software Midas. The pulsating wind pressure generated by the train passing by at a speed of 350 km/h were applied to the global model of the sound barrier structures as excitations, the static response and dynamic time history curves of the sound barrier structures were calculated, and then the dynamic amplification factors were obtained. The results show that the increase of the opening spacing on the top of the double-sided enclosed sound barrier and the reduction of the top covering length of the single-sided enclosed sound barrier are both beneficial to the release of wind pressure and improvement of structural stress. As the opening spacing increases or the covering length decreases, the beneficial effect becomes more obvious. For the double-sided enclosed sound barrier structure, the maximum dynamic stress of the columns with 2 m top opening spacing is 1.15 times that with 8 m opening spacing, and the amplification factor also increases by 0.12. For the single-sided enclosed sound barrier structure, the maximum dynamic stress of columns with 8 m top covering length is 1.28 times that with 2 m top covering length, and the magnification factor increases by 0.37.
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