声屏障结构的列车脉动风致振动分析

Vibration Analysis of Noise Barrier Structures Subjected to Train-Induced Impulsive Wind Pressure

在考虑桩-土-结构共同作用的基础上,用ANSYS软件对插板式声屏障结构的脉动风致振动响应进行了数值计算,分析了列车车型、运行速度、声屏障结构高度和长度对结构动力特性的影响,为高速铁路声屏障结构的设计提供了合理参数.结果表明:CRH2型列车比CRH3型列车通过时声屏障结构垂直构件的位移增大18.6%,弯矩增大8.5%;垂直构件的位移、弯矩随列车运行速度和结构高度增大呈非线性关系明显增大;随声屏障结构长度增大,垂直构件的位移和弯矩增大,但长度超过120 m以后减小,并逐渐趋于稳定值.

A numerical analysis of the dynamic response, induced by the impulsive wind pressure of trains, of noise barrier structures with stop plank was conducted by using ANSYS software and considering the interaction of pile, soil and structure. The dynamic characteristics of noise barrier structures were investigated by analyzing the effects of the type and speed of trains and the length and height of the structures. The reasonable parameters were provided for the design of the structures for a high-speed railway. The research shows that compared with a CRH3 train, a CRH2 train will result in a greater displacement and bending moment of props of a noise barrier structure, respectively with a increase of 18.6% and 8.5%. The displacement and the bending moment increase significantly with a nonlinear relationship with the increases of train speed and structure height. Under the condition that the length of a noise barrier structure is smaller than 120 m, the displacement and the bending moment increase with the increasing of the length, and then decrease and trend toward stable values.