双块式无砟轨道-箱梁结构振动与噪声参数影响分析

Influence of Noise Parameter on Structure Vibration of Box Girder with Double-block Ballastless Track

以跨度为32m的简支高架箱梁为研究对象,利用有限元法与间接边界元法相结合,分析了德国低干扰轨道谱激励下不同参数对双块式无砟轨道高架箱梁结构噪声的影响.结果表明:扣件刚度对钢轨的振动位移和箱梁底板的振动加速度影响较大,对高架箱梁结构噪声的影响主要在32Hz以下;行车速度对钢轨的振动加速度和箱梁底板的振动位移影响较大,对高架桥梁结构噪声的影响比较强烈,而且距离线路中心线距离越远的场点,其所受车速影响越大.

A simply supported concrete box girder with a span of 32 meters is simulated as a case study.Combining the indirect boundary element method with the finite element method,the influ-ence of the structure noise of the box girder with double-block ballastless track has been studied with different parameters under the excitation of German low interference track spectrum.The re-sults show that the fastener stiffness has great influence on the displacement of rail,and it has great influence on the acceleration of box girder base slab.The effects of the fastener stiffness on the noise of structure of viaduct mainly occur under 32Hz.The influence of the changing traveling speed on noise of structure of the viaduct is stronger.The further dimension of the site positions from the dimension of rail central line is,the greater effect it gets from the noise.