Dynamic load allowance in different positions of the multi-span girder bridge with variable cross-section

Qing-fei Gao1 , Zong-lin Wang2 , Jun Li3 , Chuang Chen4 , Hong-yu Jia5

1, 2, 3, 4School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, China

1Department of Civil and Environmental Engineering, National University of Singapore, Singapore, Singapore

3School of Architecture Engineering and Technology, Heilongjiang College of Construction, Harbin, China

5Department of Civil Engineering, Southwest Jiaotong University, Emei campus, Emeishan, China

1Corresponding author

Journal of Vibroengineering, Vol. 17, Issue 4, 2015, p. 2025-2039.
Received 13 November 2014; received in revised form 3 February 2015; accepted 15 February 2015; published 30 June 2015

Copyright © 2015 JVE International Ltd. 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.
Creative Commons License

To investigate the dynamic performance of the multi-span girder bridge under moving vehicles, based on the synthesis modal method, the program for vehicle-bridge coupled vibration analysis is completed firstly. According to the numerical simulation, the estimation formulas in current codes (China and UK) and some other references (USA) have been proved problematic. Also, the roughness and the critical speed are fully discussed. In addition, the DLA in the side span is largely different from that in the other span, and the DLA in other spans are almost the same. The DLA of middle span is little influenced by the number of spans. However, the DLA of side span will be stable only when the number of spans is not less than five. And when the number of spans is not more than five, the DLA of the three-span bridge is biggest, that of the five-span bridge is second, and that of the four-span bridge is smallest. It has been proved that the DLA in current code is not rational enough, as it does not distinguish the positions. It may provide some basis for the design and evaluation of the dynamic performance of bridges to moving vehicles.

Keywords: multi-span girder bridge, dynamic response, dynamic load allowance, vehicle-bridge coupled vibration, natural frequency.


This work was supported by the China Scholarship Council (the 2013 China State-Sponsored Postgraduate Study Abroad Program), the National Natural Science Foundation of China (No. 51308465, No. 50678051, No. 51108132, No. U1234208) and the Fundamental Research Funds for the Central Universities (No. 2682014CX004EM). The authors would like to express their deep gratitude to all the sponsors for the financial aid.


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