Experimental Study on Ultimate Axial Compression Capacity of Q420 Steel U-rib Stiffened Plates

Abstract:

Experimental study on the axial compression capacity of four Q420 steel U-rib stiffened plates with the scale ratio of 1∶2 is carried out to analyze the ultimate bearing capacity， failure mode and failure mechanism. The results show that the ultimate bearing capacities of the four plates all reach the full-section yield capacity. There are three failure modes including local buckling failure， global buckling failure and combined buckling failure. Under the ultimate compression state， the local buckling occurs before the plates reach the ultimate bearing capacity， and the global buckling finally leads to the failure of the plates. The failure positions predicted by the element slenderness are same as the experimental results， indicating that the element slenderness can be applied to the failure position prediction of the plates under the ultimate compression state.