Abstract: Based on the unified yield criterion (M. H. Yu, 1991), the plastic limit analysis for oblique plates and the unified limit loading expression are given, which includes a set of solutions from the single-shear yield criterion (Tresca , 1864) to the twin-shear yield criterion (M. H. Yu,1961). The relative curves between q and b are also got for square plates and rhombic plates. The results in the references about the problem are only the especial solutions. By using the unified yield criterion, the more proper limit loading for oblique plates about the different materials can be derived. The prominent economical benefit can be got from the engineering application of the solutions.

Key words: Oblique plate, Plastic limit loading, Rectangle plate, Rhombic plate, Square plate, Unified yield criterion