ENERGY-BASED PROGRESSIVE COLLAPSE RESISTANCE ANALYSIS OF STEEL FRAME STRUCTURES WITH SEMI-RIGID CONNECTIONS¹⁾

In order to study the anti-progressive collapse capacity of steel frame structures with semi-rigid connections, the resistance-displacement curve of the steel frame structures under the progressive collapse condition is obtained based on an energy method, as well as the resistance expression at each stage. The performance of the steel frame structure is analyzed based on a beam mechanism in the small deformation state and a catenary mechanism in the large deformation state to prevent the occurrence of the progressive collapse. The reliability of the theoretical formula is verified by comparing with the experimental results of the existing experiments, and a good agreement is observed. It is shown that the progressive collapse resistance expression of the steel frame structures with semi-rigid connections is simple and the results are reliable, and it can be used in the rapid analysis of the progressive collapse resistance of steel frame structures in the related design.