| Title |
Shear Response of Concrete Beams Based on a Fixed-Angle Crack Model |
| Keywords |
Aggregate Interlock ; Beams ; Cracking ; Crack Width and Spacing ; Shear Properties ; Shear Strength |
| Abstract |
The modified compression field theory(MCFT) was extended to include the slip deformation across the crack based on the fixed-angle crack model, thereby allowing for the non-coincident directions of the principal strain and stress. To investigate the significance of crack modelling on the analysis, a series of tests on beams without transverse reinforcement was predicted by the rotating- and fixed-angle crack models in the MCFT. The results predicted by the fixed-angle MCFT were dependent on the choice of an initial crack angle and the shear friction law, but having the initial crack angle of 45 deg. and the friction law related improved the strength predictions significantly, comparable to the rotating-angle MCFT. Nonetheless, the average strains predicted with the fixed-angle MCFT are still much greater than those from the rotating-angle MCFT due to the inclusion of slip at the crack interface. It is therefore concluded that the inclusion of slip at the crack interface is influential at least as far as deformation, rather than strength, is concerned. |