Time-dependent relaxation of the connection bolts of a high-speed railway noise barrier under train wind excitation

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 188-193.

WEI Xing1,LIU Mingyang1,WEN Zongyi1,HU Zhe2,XIAO Lin1

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Abstract

The noise barrier of high-speed railway is repeatedly excited by the wind of passing high-speed train and its bolted joints will fail due to vibration induced loosening. In order to predict loosening degree of the bolts under cyclic transverse shear load, a three-dimensional finite element model considering thread was established by ANSYS. The preload was applied by the temperature method, and the alternating transverse force was loaded. The loosening rate of different transverse force amplitude, initial preload and thread pitch was studied. The results show that the larger the amplitude of transverse force, the smaller the initial preload and the smaller the pitch of thread, the faster the loosening rate. By introducing some hypotheses, a simple method is established to predict the loosening degree of the noise barrier bolt under specific load spectrum. The results have guiding significance for noise barrier bolts maintenance.

Key words

noise barrier / bolted connection / preload / alternating load / self-loosening

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WEI Xing1,LIU Mingyang1,WEN Zongyi1,HU Zhe2,XIAO Lin1. Time-dependent relaxation of the connection bolts of a high-speed railway noise barrier under train wind excitation[J]. Journal of Vibration and Shock, 2021, 40(22): 188-193

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