Structures Congress 2019
Repair Strategies for Earthquake-Damaged CFST Bridge Columns
Publication: Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
ABSTRACT
Concrete 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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ACKNOWLEDGEMENTS
The authors gratefully acknowledge the general support from both the California Department of Transportation and the Washington State Department of Transportation on various elements of this research program. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing official policies, either expressed or implied, of the California Department of Transportation or Washington State Department of Transportation.
REFERENCES
ElSouri, A. M., & Harajli, M. H. (2011). Seismic repair and strengthening of lap splices in RC columns: Carbon fiber–reinforced polymer versus steel confinement. Journal of Composites for Construction, 15(5), 721-731.
Kappes, L., Berry, M., and Stephens, J. (2013). Performance of Steel Pipe Pile-to-Concrete Cap Connections Subject to Seismic or High Transverse Loading: Phase III Confirmation of Connection Performance. Final Report for the Montana Department of Transportation. Report Number: FHWA/MT-13-001-8203.
Lavorato, D., & Nuti, C. (2015). Pseudo-dynamic tests on reinforced concrete bridges repaired and retrofitted after seismic damage. Engineering Structures, 94, 96-112.
Lehman, DE, Elkin, S, Nacamuli, A, Moehle, JP. Repair of earthquake-damaged bridge columns. ACI Struct J 2001; 98.(2)
Montejo, L., Gonzalez-Roman, L.A., and Kowalsky, M. (2012). Seismic Performance Evaluation of Reinforced Concrete-Filled Steel Tube Pile/Column Bridge Bents. Journal of Earthquake Engineering, 16(3), 401-424.
Pantazopoulou, S. J., Bonacci, J. F., Sheikh, S., Thomas, M. D. A., & Hearn, N. (2001). Repair of corrosion-damaged columns with FRP wraps. Journal of composites for construction, 5(1), 3-11.
Roeder, C., Lehman, D., & Stephens, M. (2014). Concrete-filled steel tubes for accelerated bridge construction. Transportation Research Record: Journal of the Transportation Research Board, (2406), 49-58.
Stephens, M.T., Berg, L. M, Lehman, and Roeder, C.W. (2016a). Seismic CFST Column-to-Precast Cap Beam Connections for Accelerated Bridge Construction. Journal of Structural Engineering.
Stephens, M. T., Lehman, D. E., & Roeder, C. W. (2016b). Design of CFST column-to-foundation/cap beam connections for moderate and high seismic regions. Journal ofEngineering Structures, 122, 323-337.
Tao, Z., Han, L. H., & Wang, L. L. (2007). Compressive and flexural behaviour of CFRP-repaired concrete-filled steel tubes after exposure to fire. Journal of Constructional Steel Research, 63(8), 1116-1126.
Tao, Z., Han, L. H., & Zhuang, J. P. (2008). Cyclic performance of fire-damaged concrete-filled steel tubular beam–columns repaired with CFRP wraps. Journal of Constructional Steel Research, 64(1), 37-50.
Teng, J. G., & Hu, Y. M. (2007). Behaviour of FRP-jacketed circular steel tubes and cylindrical shells under axial compression. Construction and Building Materials, 21(4), 827-838.
Zhu, Haiqing, Stephens, M.T., Roeder, C.W., and Lehman, D.E. (2017). Inelastic Response Prediction of CFST Columns and Connections Subjected to Lateral Loading. Journal of Constructional Steel Research.
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Published In
Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
Pages: 154 - 164
Editor: James Gregory Soules, McDermott International
ISBN (Online): 978-0-7844-8223-0
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Apr 22, 2019
Published in print: Apr 22, 2019
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