Characteristics of structural state of stress for steel frame in progressive collapse

This paper studies the failure mechanism during the structural progressive collapse process of a spatial steel frame with concrete floor by applying structural state of stress theory. Firstly, structural state of stress is modeled by generalized strain energy density (GSED) derived from the experimental strain data. Then, the Mann-Kendall criterion is used to detect the leap characteristic of structural state of stress from the GSED sum-load...