44 / 2022-03-27 21:32:05

Performance of Precast Concrete Joints in Cyclic Shear by using Prepacked Concrete.

Shear, Prepacked, Joints, Damage

Joints created by consequent casting or by using of individual manufactured units with connecting steel bars creates a weak zone for shear transfer. Structures with such flat joint interfaces has shown a simultaneous deterioration of both joint planes and adjacent structural concrete. Localized damages due to shear transfer across this flat interface with intersecting bars are widely investigated. However, structural performances indicate a gap in full understanding of joints. Experimental results of double shear beams under high intensity low cycle loading indicated that shear transfer across flat joint interface creates a localized curvature of steel bars close to the interface. This localized curvature of the bar further transfers stress to concrete resulting in consequent failure of both concrete volume and joint interface. This showed tremendous deterioration of structural life and failure of structure before utilizing reinforcement bar capacity at interface. Increment of joint slip of the structure is found to indicate the damage occurred on structure and thus used in determining remaining life of the structure. Performance of precast concrete interface joints in shear by using prepacked concrete, which may transfer bearing stresses directly thought contact points of coarse aggregates, is studied and comparison is done with normal concrete in which the aggregates are suspended sparsely. The main interest is directed to the fatigue life of the structure.