混凝土箱梁的结构噪声及其影响因素

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. 

Structure-Borne Noise of Concrete Box-Girder and Its Influence Factors

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 structure-borne 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 structure-borne noise of box-girder.