Comparison between structure-borne noise characteristics of continuous trough girders and those of simply supported ones in urban rail transit
HAN Jianglong1,2, WU Dingjun2, LI Qi2
1. Department of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Department of Bridge Engineering, Tongji University, Shanghai 200092, China
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.
韩江龙1，2 吴定俊2 李奇2 . 城市轨道交通连续梁和简支梁的结构噪声特性比较[J]. 振动与冲击, 2019, 38(11): 258-263.
HAN Jianglong1,2, WU Dingjun2, LI Qi2. Comparison between structure-borne noise characteristics of continuous trough girders and those of simply supported ones in urban rail transit. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(11): 258-263.
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