Safe Bridge Barriers Tested and Simulated to EN 1317 and MASH with Low Forces Transmitted: Australian Example Compared with European Union Example

Historically in Europe, the loads transmitted to a bridge deck by a vehicle restraint system (VRS) were prescribed by a table. Because of the Europeans’ experience in crash testing, it is now known that different VRS will impart different loadings on a bridge deck and, as such, tables are inadequate for bridge deck design purposes. Better methodologies have been developed to determine loads on bridge decks transferred by a VRS. This paper will illustrate some of these methodologies and is focused on one that has been recently upgraded in Belgium to become the curve methodology detailed below. This paper will also apply the curve methodology to a specific reference VRS widely used in Australia and another one recently developed in Europe. In conclusion, the curve methodology has areas that can be improved for systems such as the MAO where it is a continuous interface between the VRS and the bridge deck. While the curve methodology can provide estimates of the loads for designing bridges with VRSs of this kind, it does not take into account the direct loads coming from the direct impact of a vehicle on the concrete elements. Further research would be helpful to develop a calculation method for estimates of the maximum loads coming from these direct impacts. Secondly, it is observed that this Australian MAO VRS has the propensity to impart large loads to the attached bridge deck. As a comparison, some of the newer VRS used in Europe for bridges transfer less than 50 kNm and 150 kN in moment and shear, respectively using the curve methodology. Finally, is has been shown that the rigid MAO system is severe for small vehicles impacting at high speed. Another system used on European bridges is under investigation to see if it could contain the heavy vehicles defined by the TL5 level according to MASH. Having passed European crash tests, it showed positive results with small vehicles with an ASI class B (<1.4). Currently, the numerical model of this bridge safety barrier is under development and TL5 simulation results should be available in the future.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 104-115
  • Monograph Title: Roadside Safety Design and Devices: International Workshop, March 26, 2015, Melbourne, Australia
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01675977
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Jul 24 2018 2:54PM