Effect of bond, aggregate interlock and dowel action on the shear strength degradation of reinforced concrete

摘要

The macroscopic shear strength contribution of concrete in reinforced ocncrete members is supported by dowel action, aggregate interlocking across tension-shear cracks and the tensile stress field that becomes mobilised in concrete through reinforcement concret bond. The mechanics of this relationship are explored in this paper for the benefit of improved understanding of the degradation of shear strength in reinforced concrete as a function of imposed deformation demand. The amthematical formaultion uses the nonlinear smeared crack/smeared reinforcement appraoch to consider plane stress states in reinforced concrete elements. The significance of this modelling aproach on the overall shear strength was evaluated by the comparison of compute dresults with those obtained form the conventional model, wherein concrete participation is lumped artificially under the so-called `tension-stiffenig' property.