Experimental Simulation of Progressive Collapse of Perimeter Frames Due to Out-of-Plane Behavior

Abstract eng:
The framed-tube structure consists of rigid moment frames in the perimeters and floor-system which provides lateral-supports to prevent perimeter column buckling. When perimeter columns deform towards the outside of the structure, simple connections between perimeter columns and floor-system may break in tension. This behavior is simulated by static tests for laterally-supported columns, where lateral drift is imposed at each story under the constant axial load. Drift mode shape, axial loading level, and the number of lateral-supports are varied. Major findings are: (1) the test results are similar to the predicted response, (2) as the lateral-support strength decreases and as the constant axial load increases, the break of lateral-supports occur at smaller drift demand level, accelerating the progressive collapse, and (3) when higher drift mode shape is imposed on the column with small lateral-support strength, the progressive collapse may occur at small drift demand level less than 2% story drift angle.

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