Study on Influence Factors of Column End Constraint in Steel Frame under Blast Loading

The constraint of frame column has a significant effect on its dynamic response under blast loading. To study the influence factors of column end constraint, the effect of adjacent members and distributed mass of floors is studied using numerical analysis. The results show that the members that are directly connected to the column end are the main contributors to its end constraint. And these adjacent members may be simplified as being fixed at the far ends. It has also been found that the displacement at the column end decreases with the increase of the column end floors mass. The results in this paper is useful for the further derivation of column end constraint model.