【摘要】 桥梁结构在车辆的动力作用下,将产生振动并辐射低频噪声,这种低频噪声对人体健康有很大的危害。针对这一问题,提出了一种基于桥面板振动的桥梁低频噪声预测方法,主要包括考虑桥面板振动的车桥耦合振动、桥面板辐射声波以及空气波传播分析。以一座辐射低频噪声较强的钢桥为对象,分别采用基于桥面板振动和基于梁格振动的方法计算了结构振动与噪声,并与实测值进行了对比。结果表明,基于桥面板振动的预测更为准确。在此基础上,探讨了降低桥梁低频噪声的方法,结果表明,降低桥面粗糙度可以降低桥梁低频噪声,但当达到ISO极好路面标准后,进一步降低粗糙度产生的效果不明显;对端横梁用混凝土进行加强是一种简便有效的降低桥梁低频噪声的方法。更多还原

【Abstract】 Under the dynamic load of vehicle,the bridge will vibrate and radiate low-frequency noise which is harmful to human health.A method for predicting the low-frequency noise is proposed based on the analysis of vibration of bridge deck.The prediction includes the analysis of vehicle-bridge coupling vibration considering the bridge deck and the analysis of sound radiation and propagation in the air.By taking a bridge with low-frequency noise as example,the vibration and sound radiation of the bridge are analyzed respectively by the current method and the previous method based on the grillage model.The results show that the prediction based on the vibration of bridge deck is more accurate.Furthermore,the measures to reduce the noise of bridge are explored,and the results indicate that a smoother road surface leads to lower noise.But when the condition of road surface is up to the extremely good standard defined by ISO,the effect of reducing the roughness of surface is not significant.Also,strengthening the crossbeam in the bridgehead is a simple and effective way to reduce the low-frequency noise of bridge.更多还原