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Evolving live load criteria in bridge design code guidelines - A case study of India based on IRC 6

  • Karthik, P. (Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology Jalandhar) ;
  • Sharma, Shashi Kant (Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology Jalandhar) ;
  • Akbar, M. Abdul (Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology Jalandhar)
  • Received : 2022.02.28
  • Accepted : 2022.03.31
  • Published : 2022.03.25
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Abstract

One of the instances which demand structural engineer's greatest attention and upgradation is the changing live load requirement in bridge design code. The challenge increases in developing countries as the pace of infrastructural growth is being catered by the respective country codes with bigger and heavier vehicles to be considered in the design. This paper presents the case study of India where Indian Roads Congress (IRC) codes in its revised version from 2014 to 2017 introduced massive Special vehicle (SV) around 40 m long and weighing 3850 kN to be considered in the design of road bridges. The code does not specify the minimum distance between successive special vehicles unlike other loading classes and hence the consequences of it form the motivation for this study. The effect of SV in comparison with Class 70R, Class AA, Class A, and Class B loading is studied based on the maximum bending moment with moving load applied in Autodesk Robot Structural Analysis. The spans considered in the analysis varied from 10 m to 1991 m corresponding to the span of Akashi Kaikyo Bridge (longest bridge span in the world). A total of 182 analyses for 7 types of vehicles (class B, class A, class 70R tracked, class 70R wheeled, class AA tracked, AA wheeled, and Special vehicle) on 26 different span lengths is carried out. The span corresponding to other vehicles which would equal the bending moment of a single SV is presented along with a comparison relative to Standard Uniformly Distributed Load. Further, the results are presented by introducing a new parameter named Intensity Factor which is proven to relate the effect of axle spacing of vehicle on the normalized bending moment developed.

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