城市轨道交通连续梁和简支梁的结构噪声特性比较  

Comparison between structure-borne noise characteristics of continuous trough girders and those of simply supported ones in urban rail transit

作　　者：韩江龙 吴定俊[2] 李奇[2] HAN Jianglong;WU Dingjur;LI Qi(Department of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Department of Bridge Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]太原理工大学土木工程系,太原030024 [2]同济大学桥梁工程系,上海200092

出　　处：《振动与冲击》2019年第11期258-263,共6页Journal of Vibration and Shock

基　　金：上海市自然科学基金资助项目(15ZR1442800)

摘　　要：用模态叠加法计算列车经过时的桥梁动力响应,借助Sysnoise用边界元法求出桥梁结构的模态声传递向量(MATVs),进而由MATVs和桥梁的模态坐标响应计算桥梁的结构噪声。计算比较了三跨简支和连续槽型梁的结构噪声特性。计算表明:远场点噪声大小需要考虑邻跨的影响;与总长和跨径相同的简支梁相比,相同截面的连续梁结构噪声无明显改善;连续梁不能有效降噪的原因在于增加约束改变的是结构整体刚度而不是梁截面板的弯曲刚度。Dynamic responses of a bridge induced by moving trains were calculated using the mode superposition method. Modal acoustic transfer vectors(MATVs) were solved using the boundary element method and the software SYSNOISE. The structure-borne noise of the bridge was then computed with MATVs and modal responses of the bridge. The structure-borne noise of a 3-span simply supported trough girder and that of a 3-span continuous one were computed and their characteristics were compared. The results showed that the effects of adjacent spans on noise of a far field point should be considered;compared to a simply supported trough girder with the same total length and span, structure-borne noise of a continuous one with the same cross-section is not obviously improved;the reason why the continuous girder can’t be effectively de-noised is increase in constraints changing the global structural stiffness instead of bending stiffness of girder cross-section plate.

关 键 词：轨道交通 槽型梁 连续梁 简支梁 结构噪声 

分 类 号：U233[交通运输工程—道路与铁道工程] TB53[理学—物理]