Novel principle for improving performance of steel frame structures in column-loss scenario

Abstract

The progressive collapse of frame structures is typically triggered by column-loss accidents. There is a tremendous need for developing new structures to resist progressive collapse. In this study, a novel principle for improving frame structures is proposed, which is called the partially out-shift plastic zone. Using this principle, a modified steel frame structure with corrugated steel plates is developed. The mechanical properties of the corrugated plates in elastic and plastic stages are investigated, indicating that part of the stress on the beam end can be steadily transmitted. The feasibility of the partially out-shift plastic zone principle is validated by the modified frame. For further optimization, multilayer steel plates and high-strength steels are applied to the modified steel frames. The multilayer configuration eliminates the composite effect so that damage accumulation can be mitigated. Excellent anti-collapse performance is observed. Because the elastic modulus differs little among steels of different strengths, the initial stiffness is hardly affected. Owing to the high strength in the plastic stage, all the peak loads are increased. The second peak load becomes the maximum one.