Experimental Study of Dynamic Progressive Collapse in Flat-Plate Buildings Subjected to an Interior Column Removal
Publication: Journal of Structural Engineering
Volume 144, Issue 8
Abstract
The experimental results of dynamically removing an interior column in a single-story, 2-bay-by-2-bay reinforced concrete flat-plate substructure are presented. The test specimen represented pre-1971 designed flat-plate buildings. The specimen was loaded with dead weight at a load level equal to 78% of the unfactored design load and the support under the interior column suddenly removed by means of a collapsing jack. The test specimen experienced punching failures at four neighboring slab-column connections, but did not fully collapse due to postpunching capacity. Because the gravity load acting on the slab was only slightly greater than a typical service load in a flat-plate building, an older flat-plate building may be at risk for progressive punching failures under a sudden column removal scenario. The measured axial force in two adjacent columns at punching failure was 36% less than the punching load in an isolated column test due to the effects of unbalanced moment, in-plane restraint, and dynamic loading. However, the slab rotation at punching was consistent with predicted rotation capacity and previous test data. The measured lateral expansion of the specimen indicated the presence of compressive membrane forces in the slab at the time of punching failure. The experimental results validated a macro model developed for simulating the behavior of plate-plate structures.
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Acknowledgments
This paper is based on work supported by the National Science Foundation under Grant Nos. 1100877 and 1100146. The authors gratefully acknowledge the financial support from the National Science Foundation. The opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsor.
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Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: May 10, 2017
Accepted: Feb 4, 2018
Published online: May 18, 2018
Published in print: Aug 1, 2018
Discussion open until: Oct 18, 2018
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