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http://dx.doi.org/10.12989/sem.2015.54.3.561

Improved definition of dynamic load allowance factor for highway bridges  

Zhou, Yongjun (Department of Highway School, Chang'an University)
Ma, Zhongguo John (Department of Civil and Environmental Engineering, University of Tennessee Knoxville)
Zhao, Yu (Department of Highway School, Chang'an University)
Shi, Xiongwei (Xi'an Highway Research Institute)
He, Shuanhai (Department of Highway School, Chang'an University)
Publication Information
Structural Engineering and Mechanics / v.54, no.3, 2015 , pp. 561-577 More about this Journal
Abstract
The main objective of this paper is to study the dynamic load allowance (DLA) calculation methods for bridges according to the dynamic response curve. A simply-supported concrete bridge with a smooth road surface was taken as an example. A half-vehicle model was employed to calculate the dynamic response of deflection and bending moment in the mid-span section under different vehicle speeds using the vehicle-bridge coupling method. Firstly, DLAs from the conventional methods and code provisions were analyzed and critically evaluated. Then, two improved computing approaches for DLA were proposed. In the first approach, the maximum dynamic response and its corresponding static response or its corresponding minimum response were selected to calculate DLA. The second approach utilized weighted average method to take account of multi-local DLAs. Finally, the DLAs from two approaches were compared with those from other methods. The results show that DLAs obtained from the proposed approaches are greater than those from the conventional methods, which indicate that the current conventional methods underestimate the dynamic response of the structure. The authors recommend that the weighted average method based on experiments be used to compute DLAs because it can reflect the vehicle's whole impact on the bridge.
Keywords
dynamic load allowance (DLA); vehicle-bridge coupling; vehicle oscillation; weighted average method; bridges;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 AASHTO LRFD (2012), LRFD bridge design specifications and commentary, Washington, DC.
2 Bakht, B. and Pinjarkar, S.G. (1989), "Review of dynamic testing of highway bridges", TRB REP. 880532, TRB and Research and Development Branch, MTO.
3 Beben, D. (2013), "Dynamic amplification factors of corrugated steel plate culverts", Eng. Struct., 46, 193-204   DOI
4 Billing, J.R. (1984), "Dynamic loading and testing of bridges in Ontario", Can. J. Civil Eng., 11(4), 833-843.   DOI
5 Chang, D. and Lee, H. (1994), "Impact factors for simple-span highway girder bridges", J. Struct. Eng., 120(3), 704-715.   DOI   ScienceOn
6 Chinese Bridge Code (2004), General Code for design of highway bridges and culverts, JTG D60-2014, Beijing, P.R. China.
7 Clarke, S.N., Deatherage, J.H., Goodpasture, D.W. et al. (1998), Influence of bridge approach, surface condition, and velocity on impact factors for fatigue-prone details, REP. NO: 1624, Council Transportation Research Record, 166-179.
8 Deng, L. and Cai, C.S. (2010), "Identification of dynamic vehicular axle loads: theory and simulations", J. Vib. Control, 16(14), 2167-2194.   DOI   ScienceOn
9 Galdos, N.H., Schelling, D.R. and Sahin, M.A (1993), "Methodology for impact factor of horizontally curved box bridges", J. Struct. Eng., 119(6), 1917-1934.   DOI
10 Green, M.F. (1993), "Bridge dynamics and dynamic amplification factors-a review of analytical and experimental findings-discussion", Can. J. Civ. Eng., 20(5), 876-877.   DOI
11 Huang, D.Z., Wang, T.L. and Shahawy, M. (1992), "Impact analysis of continuous multigirder bridges due to moving vehicles", J. Struct. Eng., 118(2), 3427-3443.   DOI
12 Hajjar, J.F., Krzmarzick, D. and Pallares, L. (2010), "Measured behavior of a curved composite I-girder bridge", J. Construct. Steel Res., 66(3), 351-368.   DOI
13 Jiang, X., Ma, Z. and Song, J. (2013), "Effect of shear stud connections on dynamic response of an FRP deck bridge under moving loads", ASCE J. Bridge Eng., 18(7), 644-652.   DOI
14 Jung, H., Kim, G., and Park, C. (2013), "Impact factors of bridges based on natural frequency for various superstructure types", KSCE Journal of Civil Engineering, 17(2), 458-464.   DOI
15 Kim, Y.J., Tanovic, R. and Wight, R.G. (2009), "Recent advances in performance evaluation and flexural response of existing bridges", J. Perform. Constr. Facil., 23(3), 190-200.   DOI   ScienceOn
16 Lalthlamuana, R. and Talukdar, S. (2014), "Effect of vehicle flexibility on the vibratory response of bridge", Coupl. Syst. Mech., 3(2), 147-170.   DOI
17 Mclean, D.I. and Marsh, M.L. (1998), Dynamic impact factors for bridges, Rep. No. NCHRP Synthesis 266, Washington D.C. University.
18 Park, Y.S., Shin, D.K. and Chung, T.J. (2005), "Influence of road surface roughness on dynamic impact factor of bridge by full-scale dynamic testing", Can. J. Civil Eng., 32(5), 825-829.   DOI
19 O'Brien, E.J., McGetrick, P. and Gonzalez, A. (2014), "A drive-by inspection system via vehicle moving force identification", Smart Struct. Syst., 13(5), 821-848.   DOI
20 Paeglite, I. and Paeglitis, A. (2013), "The dynamic amplification factor of the bridges in Latvia", 11th International Scientific Conference on Modern Building Materials, Structures and Techniques, 57, 851-858
21 Paultre, P., Chaallal, O. and Proul, J. (1992), "Bridge dynamics and dynamic amplification factors-a review of analytical and experimental findings", Can. J. Civ. Eng., 19(2), 260-278.   DOI
22 Paultre, P., Chaallal, O. and Proul, J. (1993), "Bridge dynamics and dynamic amplification factors-a review of analytical and experimental findings: reply", Can. J. Civil Eng., 20(5), 878.
23 Shepherd, R. and Aves, R.J. (1973), "Impact factors for simple concrete bridges", Proceedings of the Institution of Civil Engineers Part 2-Research and Theory, 55, 191-210.   DOI
24 Yang, Y.B., Liao, S.S. and Lin, B.H. (1995), "Impact formulas for vehicles moving over simple and continuous beams", J. Struct. Eng., 121(11), 1644-50.   DOI
25 Wang, T., Han, W.S., Yang, F. et al. (2014), "Wind-vehicle-bridge coupled vibration analysis based on random traffic flow simulation", J. Traf. Trans. Eng., English Edition, 1(4), 293-308.
26 Zhang, X., Sennah, K. and Kennedy, J. B. (2003), "Evaluation of impact factors for composite concrete-steel cellular straight bridges", Eng. Struct., 25(3), 313-321.   DOI