高速铁路50 m简支钢-混结合梁的声振特性研究  

Research on Acoustic Vibration Characteristics of a 50 m Simply Supported Steel-Concrete Composite Beam on High-speed Railway

作　　者：崔可儿 孔德睿 鄢玉胜[2] 张迅 CUI Keer;KONG Derui;YAN Yusheng;ZHANG Xun(Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi??an 710043,China)

机构地区：[1]西南交通大学桥梁工程系,成都610031 [2]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道标准设计》2024年第12期91-100,共10页Railway Standard Design

基　　金：国家自然科学基金项目(51978580)。

摘　　要：为探究钢-混结合梁在列车激励下的声振特性,以时速400 km高速铁路50 m简支钢-混结合梁为对象,基于混合有限元-边界元-统计能量分析(FE-BE-SEA)预测法计算桥梁在车辆作用下的声振响应,并对比相同激励条件下同等跨度混凝土简支箱梁的声振响应结果,研究轨道参数(减震垫)和结构参数(桥面板板厚、横隔板间距)对桥梁振动与声辐射特性的影响规律。结果表明:在钢箱结合梁各板件中,桥面板的总振动加速度级最大;在大部分频段,与结合梁相比,混凝土梁的振动和噪声响应显著下降,其中混凝土腹板的振动响应下降值最大;减振垫对于中、高频段的减振降噪效果显著;改变桥面板厚度可以适当减少钢箱结合梁结构噪声,桥面板厚度增加50%,结构噪声的总声压级变化-3.0~-2.9 dB(A);减小横隔板间距也可以显著减少桥梁结构噪声,当横隔板间距减少50%时,总声压级变化-5.6~-5.0 dB(A)。In order to investigate the acoustic vibration characteristics of steel-concrete composite(SCC)beams under train excitation,a 50 m simply supported SCC beam on a high-speed railway with a train speed of 400 km/h was taken as the subject.The acoustic vibration responses of the bridge under vehicle load were calculated using a hybrid Finite Element-Boundary Element-Statistical Energy Analysis(FEBE-SEA)prediction method.The results were compared with those of a concrete simply supported box beam of similar span under the same excitation conditions.The effects of track parameters(such as damping pads)and structural parameters(including deck thickness and diaphragm spacing)on the vibration and acoustic radiation characteristics of the bridge were studied.The results showed that,among the components of the steel-concrete composite beam,the deck exhibited the highest total vibration acceleration level.In most frequency bands,compared with SCC,the vibration and sound responses of concrete beam were significantly lower,with the vibration responses of the concrete web being reduced the most.The damping pads were found to be highly effective in vibration reduction and noise attenuation,particularly in the mid-to-high frequency ranges.Changing the thickness of the bridge deck reduced the structural noise of the SCC.When the deck thickness increased by 50%,the total sound pressure levels(SPLs)of the structural noise changed by-3.0 dB(A)to-2.9 dB(A).Reducing the diaphragm spacing also significantly reduced the structural noise of the bridge.When the diaphragm spacing was reduced by 50%,the total SPLs changed by-5.6 dB(A)to-5.0 dB(A).

关 键 词：高速铁路 振动 噪声 钢-混结合梁 统计能量法 边界元法 

分 类 号：U238[交通运输工程—道路与铁道工程] U448.21[建筑科学—桥梁与隧道工程] TB123[理学—工程力学]