高速铁路声视屏障结构振动响应仿真及控制技术

Simulation and Control Technology of Vibration Response of Noise-Visual Barrier for High Speed Railway

随着中国高速铁路的快速发展,降低列车对周围环境和社区的噪声影响已成为高速铁路设计、建设和运营中的一项关键任务,其重要性在生态敏感区、人口稠密区、景观保护区等关键区域尤为显著。为此,铁路项目通常会采用特殊声屏障来加强对此类区域的保护,这给声屏障设计和性能评估带来新的挑战。以川青铁路羊记沟大桥安装的5.6 m高的特殊声屏障为例,开展声视屏障结构振动响应仿真及控制技术研究。仿真结果表明:声视屏障比普通桥梁声屏障受列车风荷载影响更大,如果不采取控制措施,声视屏障单元板最大位移可能接近标准限值。针对这一问题,本文提出了一种在立柱顶端增设加固梁的改进方案,以限制单元板的位移。仿真分析和现场测量结果显示,加固结构可显著减少单元板位移,提升安全余量。

With the development of the Chinese high speed rail network,minimizing the impact of railway noise on the surrounding environment has become a critical aim in the design,construction,and operation of high speed railways.Its importance is particularly prominent in key areas such as ecologically sensitive areas,densely populated areas,and landscape protection areas.For this reason,railway projects usually use special noise barriers to enhance the protection of such areas,which poses new challenges to the design and performance evaluation of noise barriers.Taking the 5.6 m high special noise barrier installed on the Yangjigou Bridge of the Sichuan-Qinghai Railway as an example,the vibration response simulation and control technology research of the noise-visual barrier structure was carried out.The simulation results show that the noise-visual barrier is more affected by train wind loads than the ordinary bridge noise barrier.If control measures are not taken,the maximum displacement of the noise-visual barrier plate may be close to the standard limit value.In response to this issue,this paper proposed an improved scheme of adding a reinforced beam at the top of the column to limit the displacement of plate.Simulation analysis and on-site measurement results show that reinforced structures can significantly reduce the displacement of plate and improve safety margins.