ABSTRACT
Circular slabs are encountered in the form of bottom plates and covers for containers, wells and similar structures, and as footings for columns, foundation slabs, etc. The load is frequently symmetrical about the centre, so we will confine ourselves to this case (a number of asymmetrical cases are dealt with in YLT, pages 23-25). The worst, but still the most frequently used type of reinforcement is isotropic reinforcement, i.e. the same reinforcement in two directions at right - angles to each other. We will therefore begin with the treatment of the polar method of reinforcement, i.e. rings about the centre and straight bars along the radii. The rings may possibly be replaced by spirals whereby the number of laps can be reduced. At the centre we let two bars intersect at right - angles.
