Hybrid flexural components: Testing pre-stressed steel and GFRP bars together as reinforcement for flexural members

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 pre-stressing 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...