Erfan Najaf
Maedeh Orouji
Abstract
In recent years, there has been significant progress in using FRP materials as masonry in civil engineering. In this regard, researchers have investigated the behaviour of reinforced beams with FRP and steel bars. One way to enhance these sections is pre-stressing FRP bars to increase the bending and shearing strength of sections. Reinforcing with a hybrid bar is a new method in which GFRP and steel bars are combined. In this research, first, the type of GFRP bars is determined, and then samples are pre-stressed. Samples are modelled using LSDYNA software. Bending and shearing failure modes of reinforced beams with FRP, GFRP, steel, and hybrid bars are analyzed, and finally load-displacement behaviour and crack width are compared. By studying bending and shearing behaviour and failure modes of the beam, we found out that using hybrid bars decreases the number of cracks Wider than 0.35 mm in the same displacement and greater loading capacity. By comparing load-displacement diagrams of samples, we conclude that the sample reinforced with hybrid bars has the best function. We can benefit from the anti-corrosion property of GFRP bars by arranging the reinforcements properly. the loading capacity can be increased of the sample by pre-stressing them about 65%, consequently, displacement of samples decreased.
Keywords
reinforced beams-bending failure-pre stressed GFRP-shearing failure-LSDYNA
