| 基于振动响应的高铁声屏障结构体系研究 |
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| 引用本文： | 卫星,张靖,魏欢博,胡喆,温宗意.基于振动响应的高铁声屏障结构体系研究[J].西南交通大学学报,2022,57(2):353-359, 409. |
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| 作者姓名： | 卫星 张靖 魏欢博 胡喆 温宗意 |
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| 作者单位： | 1.西南交通大学土木工程学院, 四川 成都6100312.中铁第四勘察设计院集团有限公司, 湖北 武汉430063 |
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| 基金项目： | 四川省科技创新人才项目（2020JDRC0009） |
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| 摘 要： | 为了研究不同开口形式的封闭式声屏障在高速列车所产生风压作用下的受力特征，以某高铁声屏障为研究对象，利用有限元软件Midas建立顶部不同开口间距的双侧封闭式声屏障及顶部不同覆盖长度的单侧封闭式声屏障整体模型；将速度为350 km/h的列车驶过时产生的脉动风压激励时程作用于声屏障结构整体模型，计算得到声屏障结构的静力响应和动力时程曲线；最后计算动力放大系数. 研究结果表明:双侧封闭式声屏障顶部增加开口间距和单侧封闭式声屏障顶部覆盖长度减小都有利于风压的释放，改善结构受力情况，随着开口间距增加或覆盖长度减小，有利作用愈加明显；对于双侧封闭式声屏障，开口2 m时立柱最大动应力是开口8 m时立柱最大应力的1.15倍，放大系数也增加0.12；对于单侧封闭式声屏障中，覆盖8 m时立柱的最大动应力是覆盖2 m时立柱的最大动应力的1.28倍，放大系数也增加0.37.
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| 关 键 词： | 高铁声屏障 脉动风压 瑞利阻尼 动力放大系数 有限元分析 |
| 收稿时间： | 2020-04-27 |
Structural Effect on Mechanical Behavior of High-Speed Railway Sound Barriers Based on Vibration Response |
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| 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. |
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| Authors: | WEI Xing ZHANG Jing WEI Huanbo HU Zhe WEN Zongyi |
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| Affiliation: | 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China2.China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China |
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| Abstract: | 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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