Resistance of Flat-Plate Buildings against Progressive Collapse. I: Modeling of Slab-Column Connections
Publication: Journal of Structural Engineering
Volume 141, Issue 12
Abstract
A macromodel for slab-column connections is created for use in the system-level progressive collapse analyses of reinforced concrete flat-plate structures. The proposed model jointly uses shell and connector elements to simulate the complex behavior of slabs. Shell elements are used to simulate the flexural response of slab and the load redistribution over floor slabs. The connector elements, which permit simulating separation of slab from column on a punching failure, are defined with nonlinear responses for primary bending moment and torsion. A deformation-based punching failure criterion is defined for connector elements to simulate the punching failure at a slab-column connection and failure propagation. Parameters defining concrete tension stiffening behavior under static loading, including the peak tensile stress and the tensile strain when stress degrades to zero, are calibrated from two experiments. To ensure applicability, the proposed model is validated by 24 large-scale tests conducted on isolated slab-column connection specimens subjected to concentric gravity loading, torsional loading, and uneven gravity loading.
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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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Published In
Journal of Structural Engineering
Volume 141 • Issue 12 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 27, 2014
Accepted: Jan 26, 2015
Published online: Mar 18, 2015
Discussion open until: Aug 18, 2015
Published in print: Dec 1, 2015
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