Hysteretic Behavior and Strength Capacity of Shallowly Embedded Steel Column Bases
Publication: Journal of Structural Engineering
Volume 135, Issue 10
Abstract
A series of shallowly embedded steel column base consisting of an exposed column base and a covering reinforced concrete floor slab were tested under horizontal cyclic loading to very large deformation. By adjustments to the floor slab thickness, shape, and reinforcing bars in the slab, the initial stiffness, maximum strength, and dissipated energy of the shallowly embedded column base increase significantly with respect to those of the exposed column base. It is found to be practical to strengthen the shallowly embedded column base so that it would behave like a fully embedded column base. Punching shear failure in the floor slab around the column due to the uplift of the base plate occurs when the shallowly embedded column base fails. Based on the plastic theory, a mechanical model that considers the contributions of the anchor bolts and the bearing and punching shear of the floor slab is proposed to evaluate the maximum strength. The evaluated results have good agreement with the test results, with errors not greater than 20%.
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Acknowledgments
The research was sponsored by the Japanese Society of the Promotion of Science (Basic Research Category S: 14102018). The third writer was the principal investigator of this research. The writers express their gratitude to R. Yamamoto and T. Uemura for their assistance in carrying out the research.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 10 • October 2009
Pages: 1231 - 1238
Copyright
© 2009 ASCE.
History
Received: Aug 20, 2008
Accepted: Mar 30, 2009
Published online: Apr 1, 2009
Published in print: Oct 2009
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