Minimum spacing between reinforcement bars in foundation tie-beams

Concrete casting in foundation tie-beams is not an easy procedure. These beams are not fixed together with a slab as are superstructure beams; consequently concrete has to be poured down the beam’s narrow top opening and reach the bottom of the beam. Because of the fact that tie-beams normally have a considerable height and therefore dispose of a large internal lever, it is preferable to place rebars in two or even three layers along their height.