Rotation Capacity of Reinforced Concrete Slabs

Results of bending tests on three continuous reinforced concrete slab strips are compared with calculations according to linear, nonlinear, and limit analysis approaches, as well as with code provisions. It is demonstrated that the reduced ductility properties of cold-deformed and coiled small-diameter reinforcing bars and wires may result in dangerous strain localizations, impairing rotation capacity, permissible moment redistribution, and ultimate strength. A nonlinear analysis method for refined deformation investigations is presented, and minimum ductility requirements for reinforcing steel are suggested.