Study on Conditions for Preventing Progressive Collapse in Multistory Steel Frames

Abstract eng:
There are two possible cases of behaviors of multistory frames after the vertical collapse of one story, where the collapse occurs due to an event such as a fire, an explosion or an earthquake. In one case, the collapse proceeds to a certain extent and then ceases, while in the other, the collapse occurs continuously until all stories collapsed completely. In the latter case, the collapse is called a progressive collapse, which is an unstable phenomenon of frames resulting from gravity load. This study elucidates the frame conditions that enable the stories to resist progressive collapse by comparing the gravity potential energy released by the collapsed story with the energy absorbed by columns before they completely collapse due to compressive load.

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