Concrete members historically have used either pre-stressed steel or steel bars. In recent years there has been an increased interest in the use of fiber reinforced polymer (FRP) materials. However, the flexure behavior of a hybrid system reinforced by the combination of pre-stressed steel and glass fiber reinforced (GFRP) is still relatively unknown. The purpose of this work is to study this. Two slabs of 4 and 6-inch thickness, with a span of 7 ft. reinforced with both prestressing steel and glass fiber reinforced (GFRP) were constructed and tested to failure using ACI 318-11 and ACI 440.1R-15. The concrete had strength of 4.5 ksi and the slabs were respectively reinforced with 5#4 bars and 3#5 bars. Each slab had .058 square inch prestressing wire with a failure stress of 250 ksi. The flexural strength of slabs were compared with their respective theoretical slabs with either pre-stressed steel or GFRP rebar, or hybrid system. It was found that the hybrid system produces better results.
July 27th, 2016
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