380 km·h^(-1)以上高速铁路插板式声屏障动力特性及响应分析

Dynamic Characteristics and Response Analysis of Plug-in Sound Barrier for High-Speed Railway above 380 km·h^(-1)

随着高速铁路的发展,行车速度不断提升,对于声屏障的结构性能要求也逐步提高。基于数值分析方法,运用有限元软件Midas Civil,建立6种常用结构形式插板式声屏障模型,进行380 km·h^(-1)以上高速铁路插板式声屏障动力特性及响应研究。结果表明:不同结构形式的插板式声屏障在增设1 m高通透隔声板后自振基频减小;在车速为380,400和420 km·h^(-1)条件下,插板式声屏障立柱的横向位移、组合应力和纵向弯矩放大系数在未设置1 m高通透隔声板时均随车速的增大而增大,而在增设1 m高通透隔声板后则随车速的增大先增后减;在相同车速下,增设1 m高通透隔声板后,立柱的横向位移、组合应力和纵向弯矩放大系数均增大。针对增设1 m高通透隔声板的声屏障,设计时除需重点关注420 km·h^(-1)车速时的结构动力响应外,还需额外关注400 km·h^(-1)车速时的结构动力响应。

With the development of high-speed railway,the operation speed continues to increase,and the structural performance requirements for sound barriers are gradually increasing.Based on the numerical analysis method,six commonly used structural forms of plug-in sound barrier models are established by the finite element software Midas Civil,to study the dynamic characteristics and response of plug-in sound barriers for high-speed railway above 380 km·h^(-1).The results show that the natural vibration fundamental frequencies for different structural forms of plug-in sound barriers decrease after adding 1 m high transparent sound insulation boards.Under the conditions that the operation speeds are 380,400 and 420 km·h^(-1),the lateral displacement,combined stress and longitudinal bending moment amplification factors of the plug-in sound barrier upright columns increase with the increase of the operation speed without adding 1 m high transparent sound insulation boards,but increase first and then decrease with the increase of the operation speed after adding 1 m high transparent sound insulation boards.At the same operation speed,the lateral displacement,combined stress and longitudinal bending moment amplification factors of the upright columns all increase after adding 1 m high transparent sound insulation boards.For the sound barriers with adding 1 m high transparent sound insulation boards,in addition to focusing on the structural dynamic response at the speed of 420 km·h^(-1),more attention should be paid to the structural dynamic response at the speed of 400 km·h^(-1) in the design.