Question

What are the main factors affecting the shear capacity of the diagonal section?

Answer 1

Ans) Main factors affecting the shear capacity of diagonal section are :

1) Shear span ratio - Shear span is defined as the distance between the support and nearst concentrated load P acting on top of beam . Shear span ratio is ratio of shear span to effective depth of member. For shear span ratio less than 1.5 , failure is compressive failure

2) Grade of concrete - The concrete grade affects the capacity of residual concrete section on the tip of diagonal crack to resist compression and tension  Test results shows that diagonal section shear strength increases with increasing grade of concrete.

3) Longitudinal steel ratio - The longitudinal reinforcement affects the extending of diagonal cracks into compression zone and thus indirectly affects the shear capacity of diagonal section Test results shows that diagonal shear section strength increases very slightly with the increasing longitudinal steel ratio.

4) Shape of section - As the shape of section affects magnitude and orientation of the principal stress and thus affects the ultimate shear capacity of section.