Reinforcement @ openings in walls

Doors and service openings in structural walls introduce weaknesses that are not confined merely to the consequential reduction in cross-section. Stress concentrations are developed at the corners, and adequate reinforcement needs to be provided to cater for these stresses. This reinforcement should take the form of diagonal bars positioned at the corners of the openings as illustrated in the figure below. The reinforcement will generally be adequate if it is designed to resist a tensile force equal to twice the shear force in the vertical component of the wall as shown, but should not be less than two size 16 bars across corner of the opening.