Repair Strategies for Earthquake-Damaged CFST Bridge Columns
ABSTRACTConcrete filled steel tubes (CFST) are composite structural elements which provide an economical alternative to traditional RC columns for their ease of construction and efficient structural properties. Recent research has resulted in practical and structurally robust CFST column connections for highway bridge construction in seismic regions. One such connection, referred to as the embedded ring (ER) connection, is a fully restrained, full-strength moment resisting connection which relies on an annular ring, welded to the end of the steel tube, and embedded in the cap beam or foundation. This paper is focused on the development of practical repair strategies for the ER CFST connection following seismic events. Several repair strategies which rely on plastic hinge relocation have been numerically investigated. In each strategy, the damaged region of the CFST is encased in a concrete pedestal, and different methods are used to transfer force from the CFST column into the pedestal. Namely, shear studs, steel rings, and simple weld beads have been investigated. Preliminary results indicate that all repair methodologies are effective shifting inelastic deformation away from the damaged region and restoring the stiffness and strength of the CFST column.
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Availability:
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Supplemental Notes:
- © 2019 American Society of Civil Engineers 2019
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Corporate Authors:
American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, VA United States 20191-4400 -
Authors:
- Bumstead, J
- Korat, J
- Stephens, M. T.
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Conference:
- Structures Congress 2019
- Location: Orlando Florida, United States
- Date: 2019-4-24 to 2019-4-27
- Publication Date: 2019-4
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 154-164
- Monograph Title: Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
Subject/Index Terms
- TRT Terms: Columns; Concrete; Earthquake resistant structures; Maintenance; Plastic deformation; Steel structures; Structural deterioration and defects; Tubular structures
- Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Materials;
Filing Info
- Accession Number: 01723009
- Record Type: Publication
- ISBN: 9780784482230
- Files: TRIS, ASCE
- Created Date: Nov 20 2019 9:42AM