快速高架复合道路临街建筑物正面声场分析

Analysis of facade sound field of buildings along elevated complex expressway

采用虚声源法预测快速高架复合道路两侧临街建筑物正面声场的数学模型，其理论值与现场实测结果基本吻合，精度在±２．５ｄＢ（Ａ）之内。得出由于建筑物正面影响，一侧有建筑物时，建筑物前１ｍ处声级升高２ｄＢ（Ａ），两侧有建筑物则升高５．５ｄＢ（Ａ），同时指出这种效应只在建筑物前附近处才显著。

his article reports a mathematic model of the facade sound field for buildings along an elevated complex expressway calculated by the image source method. The computations are basically in agreement with the field observations. The precisions is within ±2.5dB(A). It is concluded that if there are buildings on one side of the expressway, the noise level at a distance of 1m from the buildings increases by 2dB(A); if there are buildings on both sides, the noise level increases by 5. 5dB(A). It is pointed out that the influence is significant only near the front of the buildings.