Prestressing tendons can improve the shear capacity of concrete section. It can also help resisting the shear force with counteracting vertical force, provided the tendon is inclined in appropriate direction.
When the principal
stress due to shear exceeds the tensile capacity of concrete, shear failure
will take place while the section remains uncracked in flexure.
To avoid this
failure, the maximum shear stress in concrete is often limited to acceptable
value.
When determining
the shear resistance of concrete section, only web resistance is considered.
Additional resistance against shear is provided using links or stirrups.
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