Behavior of Reinforced Concrete Column–Steel Beam Roof Level T-Connections under Displacement Reversals
Publication: Journal of Structural Engineering
Volume 132, Issue 7
Abstract
Results from an experimental study on the seismic response of two hybrid RC column-to-steel (S) beam (RCS) roof level T-connection subassemblies are presented. The primary variables investigated were: (1) anchorage requirements in column longitudinal bars; and (2) confinement requirements in RCS roof level T-connections. In the first subassembly the column bars were anchored by providing a development length of diameters and an end mechanical anchor with twice the diameter of the bar, while connection confinement was provided by steel band plates wrapping around the column regions just above and below the steel beam. This specimen exhibited a stable response up to 4.0% drift, the displacement at which a column bar anchorage failure occurred, which led to excessive bar slip through the connection with the associated decay in stiffness and strength. In the second specimen the development length for the column longitudinal bars was increased to diameters and a larger bearing area for the mechanical anchors was provided through steel channel sections running transversely above the top flange of the steel beam. The behavior of the second specimen was characterized by large column inelastic rotations, good stiffness retention and energy dissipation capacity, and limited joint damage. Thus, experimental results indicate that properly designed RCS roof level T-connections exhibit a stable behavior under large inelastic deformation reversals, such as those induced by strong earthquakes.
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Acknowledgments
The research study described herein was sponsored by the National Science Foundation under Grant No. NSFCMS-0219503. The writers would also like to thank Mr. Robert Smith for support from ERICO, who supplied the headed bars used in this project. The suggestions of Professor James K. Wight are also greatly appreciated. The opinions expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsor.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 7 • July 2006
Pages: 1041 - 1051
Copyright
© 2006 ASCE.
History
Received: Jan 19, 2005
Accepted: Sep 14, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
Notes
Note. Associate Editor: Yahya C. Kurama
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