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icubed consulting were engaged in late 2016 to complete the detailed design of a new AS5100 compliant road bridge on Grady’s Creek Road for Kyogle Council in NSW. The 8m wide by 46m road bridge was broken up into four 11.25m spans and was constructed using Wagners CFT Fibre Reinforced Polymer beams and a reinforced concrete deck wearing surface.
Kyogle Council were looking for a maintenance free, simple bridge design for their construction team to continue repairing and replacing bridges in their road network. The bridge is founded on reinforced concrete bored piers founded into low lying basalt. icubed were able to assist with constructability by designing a modular abutment structure made from Wagners Megablocks. The Megablocks were precast and delivered to site and installed on top of the pile cap footing without having to wait for typical abutment walls or columns to cure before placing the girders.
Grady’s Creek Bridge proved to be a complex design exercise as the region is frequently inundated with large flood waters from their vast catchment. The bridge was required to withstand 3.5m/s flood and debris forces which included log impact loads on the piers and deck. The bridge also was assessed for earthquake design actions to AS5100 and AS1170.4. The two-lane road bridge would be subjected to SM1600 design vehicles over its design life. Fatigue, thermal effects, shrinkage and creep assessments were undertaken to evaluate the performance of the structure over time. The analysis of the bridge structure was completed using Finite Element Software, Strand7 with excellent results.
If you would like more information about FRP bridge design please contact Rohan McElroy at our Toowong office on 07 3870 8888.