Bridge Piers with Structural Fuses and Bi-Steel Columns. I: Experimental Testing
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Volume 17, Issue 1
Abstract
Structural fuses, easily replaceable sacrificial elements to dissipate seismic energy while preventing damage to the gravity load-resisting structural system, are proposed as part of a multicolumn accelerated bridge construction (ABC) pier concept. Different types of structural fuses are investigated to compare the effect of each on ABC bridge bents. The piers of a three span-continuous bridge prototypes having two twin-column pier bents were designed using double-composite rectangular columns and structural fuses. Two corresponding -scale models were developed and were subjected to cyclic quasi-static tests. For the first specimen, steel-plate shear links (SPSLs) were installed between the columns as a series of structural fuses. Testing was performed, first up to a drift corresponding to the onset of columns yielding to investigate the effectiveness of adding the fuses in dissipating the seismic energy, then up to failure of the composite columns. The second tested specimen has buckling restrained braces (BRBs) as a series of structural fuses between the columns. The BRBs were then removed, and a cyclic test of the composite bent continued until failure of the columns. Both specimens exhibited stable hysteretic behavior, with the structural fuses also increasing stiffness and strength of the bent. Individual testing results for the SPSLs with various geometries and boundary conditions are then presented.
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Acknowledgments
This research was supported in part by the Federal Highway Administration under contract number FHADTFH61-07-C-00020 to the MCEER. The donation of the bi-steel panels by Corus Bi-Steel and the BRBs by Star Seismic is also sincerely appreciated. However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the writers and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Bridge Engineering
Volume 17 • Issue 1 • January 2012
Pages: 25 - 35
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Aug 12, 2010
Accepted: Feb 22, 2011
Published online: Feb 24, 2011
Published in print: Jan 1, 2012
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