Behavior of Tension Lap Splices Confined by Transverse Reinforcement on Different Types of Reinforced Concrete Beams

Abstract

In the recent years, many research efforts have been carried out on the effect of different parameters on modifying bond strength of tension lap spliced reinforcing bars in beams such as lap splice length. Comparatively, Limited attention has been directed towards the effect of using transverse reinforcement along the splice length. An experimental program consists of sixteen reinforced concrete beams was conducted in the concrete research laboratory of Cairo university to investigate the effect of providing transverse reinforcement within the splice region and splice bond strength. The parameters covered are number, diameter and shape of transverse reinforcement provided for different concrete types. The used concrete types on the research are normal strength concrete, high strength concrete and self - compacting concrete. The research involved tests on simply supported beams of 1800mm span and 150*250 mm cross section where tensile steel was spliced in the constant moment zone. Load - deflection relationship, steel strain and crack propagation are recorded during loading from which we can judge the effect of each parameter on the ductility and mode of failure of each beam.