客运专线钢板结合连续梁桥结构噪声分析

Analysis of the Structure-borne Noise of Composite Steel Plate Continuous Bridge in Passenger Dedicated Line

研究目的：钢板结合梁桥因使用了具有较大面积的钢结构构件而向周围环境辐射较大的结构噪声，这种噪声尚无法通过传统的声屏障措施予以抑制。为了有的放矢地提出结构噪声治理措施，首要任务应掌握该类桥梁结构噪声的频率、空间分布特性，以及桥梁各部分的噪声贡献率。为此，本文基于统计能量原理对一座典型的钢板混凝土结合梁桥的结构噪声进行分析，从而获得其辐射噪声的各种规律。研究结论：（1）钢板结合梁桥结构噪声以125～1250Hz为主，属于中高频辐射噪声；（2）基于典型声场场点的计算结果，在各桥梁部件中，钢主梁腹板是最主要的噪声源，其辐射贡献率达50％以上；（3）该类桥梁结构噪声在地面附近处的衰减速度随着距离的增加而变缓；（4）该研究成果可为铁路钢板结合梁桥的结构噪声治理提供技术指导。

Research purposes： The composite steel plate bridge can generate larger structure - borne noise which cannot be reduced by conventional sound barrier due to the larger area of steel structural component of the bridge. In order to reduce the structure - borne noise, the frequency and space distribution characteristic, and the contribution of the steel subsystem should be considered firstly. So, the characteristics of structure - borne noise of the composite steel plate bridge were obtained based on the statistical energy analysis method. Research conclusions： （ 1 ） The structure - borne noise is mainly in 125 - 1 250 Hz called medium and high frequency bands. （2） Based on results of typical sound field sites, the web of steel girder is the main noise source, of which the radiation contribution rate is more than 50%. （ 3 ） The decay speed of the structure - borne noise near the ground becomes slow with the incensement of the distance from the bridge. （4） The research results can provide important technical guidance for the structure - borne noise control of railway composite steel plate bridge.