混凝土箱梁的结构噪声及其影响因素

摘要

In order to research on structure-borne noise of box-girder and its influence factors,a simply-supported concrete box-girder with a span of 32 m was selected as the case study,its structureborne noise was simulated by means of hybrid FEM-BEM method,and the computed results were validated by field measurements.On this basis,the influence laws of plate thickness and dip angle of web on structure-borne noise were probed into.The research results show that the dominate frequency ranges of box-girder vibration and structure-borne noise are 40.0 to 125.0 Hz and 31.5 to 100.0 Hz,respectively,and the peak frequency of noise around the bottom plate is 63.0 Hz.The structure-borne noise decreases with the increase of plate thickness,and the addition of top plate thickness is the most effective noise-reduction measure.The preferable dip angle of web is 0° to 12° for lower structureborne noise of box-girder.%为探讨箱梁的结构噪声及其影响因素,以跨度32 m的混凝土简支箱梁为研究对象,采用混合有限元-边界元法进行数值仿真,并进行了现场试验验证.在此基础上,探讨了板厚和腹板倾角对箱梁结构噪声的影响规律.研究结果表明:混合有限元-边界元法适用于箱梁的结构噪声分析；箱梁振动和结构噪声的主要频率范围分别为40.0～ 125.0 Hz和31.5～ 100.0 Hz,底板附近在63.0 Hz出现噪声峰值；增大板厚能降低箱梁结构噪声,且增大顶板厚度最有效；当腹板倾角为0°～ 12°时,箱梁的结构噪声较小.