Effect of Reinforcing Bar Size on Shear Transfer Across a Crack in Concrete.

摘要

The total study is concerned with the shear transfer strength of reinforced concrete subject to both single direction and cyclically reversing loading,the latter simulating earthquake conditions. The primary topics studied were the influence of the existence in the shear plane of an interface between concretes cast at different times,and the influence of reinforcing bar diameter on shear transfer across a crack in monolithic concrete. This Part 3of the Final Report is concerned with the effect of size of reinforcing bar on shear transfer across a crack in concrete,under both monotonic and cyclically reversing shear. Monotonic and cyclically reversing shear transfer tests were made of initially cracked concrete push-off specimens,having reinforcement varying from number 4to number 18in size. Some reduction in shear transfer strength occurred as the bar size was increased from number 8to number 18,but the monotonic loading strength of all specimens was conservatively predicted by the shear-friction equation. The strength under reversed cyclic loading was about 0.8of the strength under monotonic loading.