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Advances in Civil Engineering
Volume 2018 (2018), Article ID 4863503, 10 pages
Research Article

The Analysis of Stress Waves at a Junction of Beam and String

1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
2School of Civil Engineering, Shijiazhuang Tiedao University, Shjiazhuang 050043, China

Correspondence should be addressed to Niujing Ma

Received 3 September 2017; Revised 14 November 2017; Accepted 19 December 2017; Published 7 March 2018

Academic Editor: Tayfun Dede

Copyright © 2018 Mu Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In the bridge engineering, there are some problems about the dynamics that traditional theory cannot solve. So, the theory about stress waves is introduced to solve the related problems. This is a new attempt that the mechanic theory is applied to practical engineering. The stress wave at a junction of the structure composed of beams and strings is investigated in this paper. The structure is studied because the existence of a soft rope makes the transmission of the force in the bridge structure different from the traditional theory, and it is the basis for further research. The equilibrium equations of the displacement and the internal force are built based on the hypothesis. The fast Fourier transform (FFT) numerical algorithm is used to express an incident pulse of arbitrary shape. The analytical solutions are substantiated by comparing with the finite element programs. The conclusion that if the cross section of the string is relatively small, then the energy density of the structure is relatively large, which is disadvantageous to the structure, can be obtained from this paper.