Abstract
This retort describes the process by which the authors derived an ultimate load bearing capacity formula based on yield line theory for various kinds of floor slabs with unidirectional slab bands. The authors conducted tests on slabs with two unidirectional slab bands as samples to verify their formula. Furthermore, a few model floor slabs were compared with the samples on the basis of elasto-plastic analysis. Slab thickness, width, number of rows, and the span ratio of the slab bands were varied as the load bearing characteristics of the floor slabs with slab bands were compared and studied in various ways.