Experimental Study on Alignment of Lapped Bars in Tension Region in Fiber Reinforced Concrete Beams

Lap splices are widely used in masonry structures because of limited lengths of rebars combined with relative ease of construction and cost when compared to other splicing methods. Major design codes encourage staggering lapped joints in tension by imposing a penalty on lap length depending on the proportion of bars lapped at the same section .Staggering lapped joints increases the complexity of detailing and steel fixing, and may require additional resources and slow construction on site. An experimental program has been conducted in order to investigate the flexural behaviour of concrete beams by changing the alignment of tension reinforcement lap splice. A test series of four simple beams containing different lap splice length is been going to conduct in this investigation. The beams are of 2000 mm total length and 180*230 mm cross section. The parameters included in the experimental program are the splice length and the bar diameter 12mm. A traditional volume fraction of hooked steel fibers was adopted for FRC. The beam which is lapped in staggered manner without leaving a gap is found to fail at 110.6kN with a deflection of 11.95mm.Which has got good load carrying capacity as compared to other beams. As compared to control specimen the beam which is lapped in staggered manner without leaving a gap (B3) is found to have an increase of 13.38% of ultimate load and 62% of increase of deflection and first crack is formed at load of 40kN has got an increase of increase of 33.5%.