某封闭式声屏障对高层建筑的降噪效果分析

Analysis of Noise Reduction Effect of a ConfinementSound Barrier for High-Rise Buildings

基于典型案例研究封闭式声屏障对高层建筑的降噪效果,通过模型模拟分析各测点在不同预测情景下的预测结果,为交通类环境影响评价及声屏障设计提供参考。由预测结果可知:在无声屏障条件下,预测点各楼层贡献值随楼层的增加呈先增大后减小的趋势,最大值出现在中间楼层(9~21层);设置封闭式声屏障之后,预测点各楼层贡献值随楼层的增加呈先增大后保持相对稳定的趋势,最大值均出现在高楼层(26~32层)。封闭式屏障对高层建筑所有楼层都有降噪效果;位于声屏障中间位置的预测点的降噪效果比位于端口处的预测点的降噪效果平均高3~4 dB(A);延长声屏障长度对端口处预测点和中低楼层有更好的降噪效果。在实际应用中,要结合环境保护目标的降噪要求,经过综合论证比选之后确定声屏障的外延长度。

The noise reduction effect of a confinement sound barrier for high-rise buildings is studied.The prediction results of different points at different scenarios are analyzed by model simulation.If without sound barrier,the predicted values trend to increase first and then decrease as the floor rises,with the maximum value in middle floor(9~21).When a confinement sound barrier is setting up,the predicted values trend to increase gradually and then maintain relatively stable as the floor rises,with the maximum value in high floor(26~32).The confinement barrier has noise reduction effect on all floors of high-rise buildings.As for noise reduction effect is concerned,the measuring points in the middle of barrier is 3~4 dB(A)better than those of at the ends.Extending the length of sound barrier is an effective way to improve the noise reduction effect for middle-low floors and the floors at the ends of barrier.For different cases,it is necessary to think of specific environmental requirement and economic budget and select technologically suitable length of sound barrier.