Effect of Infill Wall on Behavior of Steel Frame Connections with Concrete-Filled Steel Tube Columns under Explosion

The walls placed in structural frames can act as a loading surface against the explosion load and significantly increase the dynamic load applied to the structural members. Therefore, the durability of the walls against the blast load and how they are connected to the structural members may have a significant effect on the dynamic response of the structures to the blast load. To investigate this subject, finite element method and Abaqus software are used. Initially, to ensure the accuracy of the predictions of finite element model, verification is performed by modeling an explosive experiment on a concrete-filled steel tube column and a good agreement is observed. Then, the effect of the presence or absence of a concrete wall in the frame and how it is connected to the beam and column is investigated using dynamic explicit analysis. The results of the study showed that in the case of no wall and in the case where the wall is attached to the column only, the highest amount of plasticity has occurred in the beam. In specimens with wall-to-column connection, the maximum plastic strain is observed at the base of the column. The existence of infill wall and the attachment to a beam or column has a significant effect on the vertical displacement of the beam.