LI Song-hui, LI Shuo, NIE Rui-feng, ZHANG Xian-tang. Weight limits for highway bridges under different technical condition ratings[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 126-134. doi: 10.19818/j.cnki.1671-1637.2020.06.011
Citation: LI Song-hui, LI Shuo, NIE Rui-feng, ZHANG Xian-tang. Weight limits for highway bridges under different technical condition ratings[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 126-134. doi: 10.19818/j.cnki.1671-1637.2020.06.011

Weight limits for highway bridges under different technical condition ratings

doi: 10.19818/j.cnki.1671-1637.2020.06.011
Funds:

National Natural Science Foundation of China 51874189

Natural Science Foundation of Shandong Province ZR2020ME241

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  • Author Bio:

    LI Song-hui(1970-), male, associate professor, PhD, songhui.L@163.com

  • Received Date: 2020-06-12
  • Publish Date: 2020-06-25
  • In accordance with the current Code for Maintenance of Highway Bridges and Culverts(JTG H11—2004), a weight limit analysis method for reinforced concrete(RC) simply supported beam bridges was proposed by considering the actual technical condition ratings. Moreover, the typical vehicle weight limits for bridges under different technical condition ratings recommended in codes in different periods were determined. Based on the structural reliability theory and design expressions in the current code, a simplified analytical model of weight limits for highway bridges was established by taking the design live-to-dead load ratio as the fundamental parameter. The nominal resistances in the current bridge design code were used as the basis for determining the corresponding resistance correction factors for bridges under different technical condition ratings. A program for the weight limit analysis of highway bridges was used to calculate the weight limit factors of bridges under different technical condition ratings designed in accordance with the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(JTJ 023—85, JTG D62—2004, and JTG 3362—2018). The recommended weight limits of RC simply supported beam bridges were proposed under the assumption that the standard effect limit of design vehicle load was equivalent to the typical vehicle load effect. Analysis result shows that under the same technical condition rating and safety level, the bridge weight limits with ratings of truck-S20 and truck-20 in the JTJ 023—85 code are higher than those with safety levels of highway-Ⅰ and highway-Ⅱ in the JTG D62—2004 code, and the maximum differences are 1.2 and 5.0 t, respectively. The bridge weight limits with ratings of highway-Ⅰ and highway-Ⅱ in the JTG 3362—2018 code are significantly higher than those in the JTJ 023—85 and JTG D62—2004 codes, and the maximum differences are 13.8 and 8.6 t, respectively. Moreover, the higher the technical condition rating, the greater the difference between the bridge weight limits. The differences in the initial design resistance of bridges in codes in different periods lead to different typical vehicle weight limits under the same technical condition rating. When formulating the weight limit measures for existing bridges according to their technical condition ratings, the influences of design codes in different periods should be considered.

     

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