Design Of Bridge Barriers For New loadings From DR00375

Bott, Andrew (2002). Design Of Bridge Barriers For New loadings From DR00375 B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Bott, Andrew
Thesis Title Design Of Bridge Barriers For New loadings From DR00375
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2002
Thesis type B.Sc Thesis
Supervisor F. Albermani
Total pages 91
Language eng
Subjects 0905 Civil Engineering
Formatted abstract
The current barrier loadings are set to increase with the introduction of the new draft code (DR00374). The current code does not give guidelines for the analysis of bridge rail barriers and only specifies that a barrier design must be based on crash testing. The new code specifies barrier loads (in all three directions x,y,z) and load application lengths for different performance levels.

This report analyses the design of bridge barriers under the new higher loadings of the draft code DR00374 and also includes a mathematical model that simulates the behaviour of a steel bridge barrier. The model in this report was developed to determine the deflected shape and member loads of a bridge rail barrier system after impact from a wayward vehicle.

The new loadings are based on the fact that traffic on the roads in Australia is changing significantly. There are more heavy vehicles in haulage and lighter and lighter passenger vehicles. The bridge barrier is more constrained than normal road barriers, as on a bridge there is far less room for lateral movement before the vehicle encroaches on the pedestrian path or even falls off the edge of the bridge. The system must redirect an impacting vehicle without creating excess hazard to the vehicle as well as not deflecting enough to cause risk to pedestrians or other traffic.

At the moment very few studies have looked at the modelling of non-rigged barrier systems. The non-linear behaviour and large plastic deflections make it difficult. The plastic deformation of the barrier and the vehicle is a necessary as reduces the energy in the collision, stoping the vehicle being sprung back onto the roadway. This lack of information and the fact that most of the studies done are road not bridge barriers means that a way of analysing these nonrigid systems needs to be developed.
Keyword bridge design

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Wed, 07 Jan 2015, 15:06:01 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service