Seismic Performance of Steel Girder Bridges with Ductile Cross Frames Using Buckling-Restrained Braces
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Volume 132, Issue 3
Abstract
Ductile end cross frames have been proposed in the past for seismic design of steel plate girder bridges. In this paper buckling-restrained braces (BRBs) are investigated as ductile end cross frames and compared against the performance of yielding X braces. Component experiments on the BRBs showed that these braces dissipated energy very efficiently and have stable hysteretic behavior. Shake-table experiments on a large scale bridge model investigated the performance of braces with both pin-ended connections and fixed-end connections. Despite slippage, the pin-ended connections are considered more effective as flexural action in the relatively short braces is prevented. The base shear in the bridge model in response to 2.0 times the El Centro earthquake was 69% of the elastic base shear at an average drift of 2.5% during experiments. The relatively large deformation capacity of the BRBs, although not as great as the X braces, is necessary to achieve a significant reduction in base shear. The maximum cross frame displacements with the BRBs are consistently smaller than those in X braces at the same level of base shear.
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Acknowledgments
This project was funded by the Federal Highway Administration through the Highway Project at the Multidisciplinary Center for Earthquake Engineering, University of Buffalo under Contract No. UNSPECIFIEDDTFH61-98-C-00094. Additional funding was provided by the California Department of Transportation under Contract No. UNSPECIFIED59Y564. Grateful acknowledgement is made to both agencies for their generous support. The donation of the BRBs by Nippon Steel Corporation and assistance of Dr. Ian Aiken in facilitating the experiments is also greatly appreciated.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 3 • March 2006
Pages: 338 - 345
Copyright
© 2006 ASCE.
History
Received: Jan 14, 2005
Accepted: Jun 27, 2005
Published online: Mar 1, 2006
Published in print: Mar 2006
Notes
Note. Associate Editor: Reginald DesRoches
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