Impact Factors for Fatigue Design of Steel I-Girder Bridges Considering the Deterioration of Road Surface Condition
Publication: Journal of Bridge Engineering
Volume 21, Issue 5
Abstract
The purpose of this paper is to evaluate the impact factor (IM) in LRFD bridge design specifications for fatigue design and to propose a method for determining reasonable IMs for the fatigue design of steel I-girder bridges that can more rationally consider the effect of the deterioration of the road surface condition (RSC) during its whole lifecycle. The deterioration process of the RSC was investigated under the given traffic and environmental conditions, and the number of truck passages taken for the RSC to deteriorate from one class to the next was investigated. A three-dimensional coupled vehicle–bridge model was developed to simulate the interaction between the bridge and vehicle, with both the bridge and fatigue load models adopted from an existing LRFD code. The IM of the stress range (IM_SR), which is calculated using the stress range instead of the maximum stress used traditionally, was used for the fatigue analysis of steel girders. Numerical simulations were performed to study the IM_SR of steel I-girder bridges under different RSCs while taking into consideration the effect of two other important parameters: bridge span length and vehicle speed. Results show that the RSC has a greater impact on the IM_SR than on the traditional IM, and the IM_SR is greater than the traditional IM calculated using the maximum stress. By considering the cumulative fatigue damage caused by the passage of each truck under different RSCs and the deterioration process of the RSC during its whole lifecycle, simple and reasonable expressions were proposed for the IMs for fatigue design of steel I-girder bridges under the given traffic and environmental conditions.
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Acknowledgments
The authors acknowledge financial support provided by the National Natural Science Foundation of China (Grants 51208189 and 51478176) and the Excellent Youth Foundation of Hunan Scientific Committee (Grant 14JJ1014).
References
AASHTO. (2012). LRFD bridge construction specifications, 3rd Ed., Washington, DC.
ANSYS 14.5 [Computer software]. ANSYS, Canonsburg, PA.
Brady, S. P., O’Brien, E. J., and Žnidarič, A. (2006). “Effect of vehicle velocity on the dynamic amplification of a vehicle crossing a simply supported bridge.” J. Bridge Eng., 241–249.
Chang, D., and Lee, H. (1994). “Impact factors for simple-span highway girder bridges.” J. Struct. Eng., 704–715.
Chotickai, P., and Bowman, M. D. (2006). “Truck models for improved fatigue life predictions of steel bridges.” J. Bridge Eng., 71–80.
da Silva, J. D. S. (2004). “Dynamical performance of highway bridge decks with irregular pavement surface.” Comput. Struct., 82(11–12), 871–881.
Deng, L. (2009). “System identification of bridge and vehicle based on their coupled vibration.” Ph.D. thesis, Louisiana State Univ., Baton Rouge, LA.
Deng, L., and Cai, C. S. (2009). “Identification of parameters of vehicles moving on bridges.” Eng. Struct., 31(10), 2474–2485.
Deng, L., and Cai, C. S. (2010a). “Development of dynamic impact factor for performance evaluation of existing multi-girder concrete bridges.” Eng. Struct., 32(1), 21–31.
Deng, L., and Cai, C. S. (2010b). “Identification of dynamic vehicular axle loads: theory and simulations.” J. Vib. Control, 16(14), 2167–2194.
Deng, L., and Cai, C. S. (2010c). “Bridge model updating using response surface method and genetic algorithm.” J. Bridge Eng., 553–564.
Dodds, C., and Robson, J. (1973). “The description of road surface roughness.” J. Sound Vib., 31(2), 175–183.
Huang, D., and Wang, T.-L. (1992). “Impact analysis of cable-stayed bridges.” Comput. Struct., 43(5), 897–908.
Hwang, E.-S., and Nowak, A. S. (1991). “Simulation of dynamic load for bridges.” J. Struct. Eng., 1413–1434.
ISO. (1995). “Mechanical vibration—Road surface profiles—Reporting of measured data.” ISO 8068:(E), Geneva.
Jaksic, V., Connor, A. O., and Pakrashi, V. (2014). “Damage detection and calibration from beam–moving oscillator interaction employing surface roughness.” J. Sound Vib., 333(17), 3917–3930.
Liu, C., Huang, D., and Wang, T.-L. (2002). “Analytical dynamic impact study based on correlated road roughness.” Comput. Struct., 80(20), 1639–1650.
O’Brien, E., Li, Y., and González, A. (2006). “Bridge roughness index as an indicator of bridge dynamic amplification.” Comput. Struct., 84(12), 759–769.
Paterson, W. D. (1986). “International roughness index: Relationship to other measures of roughness and riding quality.” Transportation Research Record, 1084, 49–59.
Patrick, P., Omar, C., and Jean, P. (1992). “Bridge dynamics and dynamic amplification factors—A review of analytical and experimental findings.” Can. J. Civ. Eng., 19(2), 260–278.
Rao, V., and Talukdar, S. (2003). “Prediction of fatigue life of a continuous bridge girder based on vehicle induced stress history.” Shock Vib., 10(5), 325–338.
Sayers, M., and Karamihas, S. (2007). The little book of profiling: Basic information about measuring and interpreting road profiles, Univ. of Michigan, Ann Arbor, MI.
Schenk, C. A., and Bergman, L. A. (2003). “Response of continuous system with stochastically varying surface roughness to moving load.” J. Eng. Mech., 759–768.
Shi, X. (2006). “Structural performance of approach slab and its effect on vehicle induced bridge dynamic response.” Ph.D. thesis, Louisiana State Univ., Baton Rouge, LA.
Shiyab, A. (2007). “Optimum use of the flexible pavement condition indicators in pavement management system.” Ph.D. thesis, Curtin Univ. of Technology, Perth, Australia.
Snyder, R. E., Likins, G. E., and Moses, F. (1985). “Loading spectrum experienced by bridge structures in the United States.” Rep. No. FHWA/RD-85/012, Bridge Weighing Systems Inc., Warrensville, OH.
Wu, S. Q., and Law, S. S. (2011). “Vehicle axle load identification on bridge deck with irregular road surface profile.” Eng. Struct., 33(2), 591–601.
Yang, Y.-B., Liao, S.-S., and Lin, B.-H. (1995). “Impact formulas for vehicles moving over simple and continuous beams.” J. Struct. Eng., 1644–1650.
Zhang, W., and Cai, C. S. (2012). “Fatigue reliability assessment for existing bridges considering vehicle speed and road surface conditions.” J. Bridge Eng., 443–453.
Zhang, W., and Cai, C. S. (2013). “Reliability-based dynamic amplification factor on stress ranges for fatigue design of existing bridges.” J. Bridge Eng., 538–552.
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© 2016 American Society of Civil Engineers.
History
Received: May 25, 2015
Accepted: Oct 28, 2015
Published online: Jan 22, 2016
Published in print: May 1, 2016
Discussion open until: Jun 22, 2016
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