Abstract
To study the dynamic behavior of steel frames after a sudden column failure scenario, an experimental study was performed on a steel frame with three stories by employing an air cylinder to simulate the sudden failure of a column. The experimental results indicate that the remaining structure underwent a large plastic deformation and developed a distinct catenary action in the beams, and this action was more substantial for the first-floor beams compared to the other floor beams. A finite element model (FEM) was established and validated based on the experimental results. The influence of the material strain rate in the structural progressive collapse was analyzed. Comparing the results obtained in the numerical simulation and those obtained using the Department of Defense (DoD) standard equation, indicated that the dynamic increase factor is in the range of 1–2 when conducting static inelastic analysis on steel frames. The equation of the dynamic increase factor in the DoD standard can accurately reflect the dynamic effect of steel frames to a certain extent. However, the results provided by this equation monotonously decrease with the increase in the structural plastic deformation and do not correctly predict the rebound of the dynamic increase factor when the structural material enters the strengthening stage.
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