Optimization Analysis of Inverted T-Shaped Concrete Notched Beams

To study the effect of flange notch on the mechanical properties of inverted T-shaped concrete beam, two inverted T-shaped beam were designed for static tests, and the bearing capacity, failure mode, crack development and stress and strain of reinforcement were analyzed by comparing the two specimens.The finite element software ANSYS was used to model and verify the rationality. Based on this, the influence of material strength, longitudinal reinforcement ratio and stirrup spacing on the mechanical properties of notch beam was quantitatively analyzed. The results showed that the intact flanks of the inverted T-shaped notched beam gradually participated in the compression during the loading pro-cess, and the failure state was a typical bending-torsional failure. Compared with the intact inverted T-shaped beam,the inverted T-shaped notched beam had a significantly decrease in flexural capacity, but showed a better displacement ductility. Decreasing the stirrup spacing and increasing the longitudinal reinforcement ratio could significantly increase the characteristic load and bearing capacity of the inverted T-shaped notched beam in normal service limit state, improve the flexural stiffness of the notch beam, reduce the structural deformation, and make the notched beam effectively resist torsion.