This paper describes the fatigue behaviour of two segments of the cast in situ full scalemodel of a bridge deck slab. Each segment was reinforced with either GFRP (glass fiber reinforcedpolymer) or CFRP (carbon fiber reinforced polymer) internal and external steel straps. This hybrid FRPand steel strap design reduces the development of longitudinal crack widths and eliminates corrosioncompletely from the deck slabs. Both segments of the bridge deck slab were tested under 25 ton cyclicloading to investigate the fatigue behaviour. From the test results, it was found that at a 25 ton load level,both segments of the bridge deck slab completed one million cycles without significant damage. Based onexperimental results and analytical approach, this satisfied the serviceability and lifetime number of axlesthat a bridge deck slab would experience. It was also observed that the performance of both segmentswere comparable when completing one million cycles under a 25 ton load level. Since GFRP is muchcheaper than CFRP, internal GFRP and external steel strap is an economical alternative to reduce thelongitudinal crack width and eliminate corrosion completely from the deck slab. To investigateperformance under cyclic loading, both segments of the bridge deck slab were monitored through anumber of sensors, including: linear variable displacement transducers (LVDTs), pi-gauges, and straingauges. The deflection behaviour, crack width and strain distribution in CFRP as well as GFRP bars andsteel straps with the number of cycles are reported in this paper.
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