Abstract
Reinforced concrete slab models of several types with parts of their cross section moderately increasd in height that comprise drop panels and/or wide-flat beam type segments were put to the failure test and the resulting ultimate load-bearing capacitty for each type is compared herein with the corresponding Johansen value taking account of concrete tensile strength, as well as solution by a generalized Park method. Also a few field examples of forming such thicker stiffening zones in plan along one or both of slab centerlines are presented by way of suggesting the prospective use of those slab systems.
