Influence of Constitutive Laws on Shear Failure of Concrete Beams Without Web Reinforcement in Several Shear-Span Ratios

摘要

In this paper, numerical simulations were carried out to examine the performance of constitutive models for describing the cracking behavior and the load-displacement characteristics of shear failure of concrete structures. The problem of shear failure of RC beams was employed as a practical application of numerical modeling. Concrete deep beams without web reinforcement, in different shear-span ratios (0.5 to 1.5), were analyzed. In addition, in order to expand the comprehension on the effect of constitutive model parameters in the deep beams to slender beams, the beams in the shear-span ratio of 4.0 were numerically simulated. The structural analysis was carried out by means of the nonlinear finite element method. A smeared crack approach using a rotating crack model without shear strain on the crack plane was employed. Based on this analytical work, the effect of the compressive strength reduction after cracking and the post-peak ductility in the compressive constitutive law on shear fracture behavior for different shear-span ratios was discussed. Furthermore, the sensitivity of numerical results to the tensile constitutive laws was investigated.