Long-Term Behavior of Prestressed Old-New Concrete Composite Beams
Publication: Journal of Bridge Engineering
Volume 16, Issue 2
Abstract
This paper presents both theoretical and experimental studies of the long-term behavior of prestressed old-new concrete composite beams under sustained loads. General differential equations governing the relationship between the incremental deflection and incremental internal forces of the composite beams were deduced in the theoretical study. Closed-form solutions for simply supported composite beams were obtained and validated using test results reported in previous literature on steel-concrete composite beams. The experimental investigation consisted of static long-term load tests carried out on four prestressed old-new concrete composite beams. The behavior of the old-to-new concrete interface, time-dependent deflections, concrete strains, and prestress losses was carefully observed over 260 days. The long-term test program showed that the midspan deflections and concrete strains increased with time because of creep and shrinkage of the new prestressed concrete. The slip strains at the old-to-new concrete interface were found to be relatively small, indicating that the interface bond was sound enough to prevent slip and that the prestressing loads were effectively transferred to the old concrete. The proposed theoretical models predicted the long-term behavior of the prestressed old-new concrete composite beams with an acceptable degree of accuracy.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by Department of Communications of Liaoning Province for the project—Strengthening of Old Simply Supported RC Girders Using a Posttensioned Negative Moment Connection Technique (Project Code: UNSPECIFIED200514). In addition, the writers wish to thank the Bridge Laboratory of Southeast University, China, for supporting the experimental tests.
References
American Association of State Highway and Transportation Officials (AASHTO). (2005). AASHTO LRFD bridge design specifications, Washington, DC, 5.82–5.91.
Bradford, M. A., and Gilbert, R. I. (1991). “Time-dependent behaviour of simply-supported steel-concrete composite beams.” Mag. Concr. Res., 43(157), 265–274.
Bradford, M. A., and Gilbert, R. I. (1992). “Composite beams with partial interaction under sustained loads.” J. Struct. Eng., 118(7), 1871–1883.
Comité Européen du Béton–Fédération/Internationale du Béton (CEB-FIB). (1984). “Manual on structural effects of time-dependent behaviour of concrete.” Bulletin D’information No. 142/142 bis, CEB-FIB, Lausanne, Switzerland
China Ministry of Construction. (2002). Code for design of concrete structures (GB50010-2002), China Architecture and Building Press, Beijing, 15–16.
Faella, C., Martinelli, E., and Nigro, E. (2002). “Steel and concrete composite beams with flexible shear connection: ‘Exact’ analytical expression of the stiffness matrix and applications.” Comput. Struct., 80(11), 1001–1009.
Girhammar, U. A., and Gopu, V. K. A. (1993). “Composite beam-columns with interlayer slip-exact analysis.” J. Struct. Eng., 119(4), 1265–1282.
Huang, C. K. (2007). “Strengthened technique and construction craft of simply supported girders made continuous by using self-stress steel fiber concrete.” Rep. 200514, Dalian Univ. of Technology, China.
Jurkiewiez, B., Buzon, S., and Sieffert, J. G. (2005). “Incremental viscoelastic analysis of composite beams with partial interaction.” Comput. Struct., 83(21-22), 1780–1791.
Ministry of Transport of the People’s Republic of China. (2004). Code for design of highway reinforced concrete and prestressed concrete bridges and culverts, People’s Communication Press, Beijing, 54–58.
Mohammed, A. S., and Sherief, S. S. S. (2008). “Long-term deflection of cracked composite beams with nonlinear partial shear interaction: I-Finite element modeling.” J. Constr. Steel Res., 64(12), 1446–1455.
Ranzi, G., and Bradford, M. A. (2006). “Analytical solutions for the time-dependent behaviour of composite beams with partial interaction.” Int. J. Solids Struct., 43(13), 3770–3793.
Robberts, T. M. (1985). “Finite difference analysis of composite beams with partial interaction.” Comput. Struct., 21(3), 469–473.
Wang, W. W., Li, S. Q., and Weng, C. N. (2009). “An experimental study on transform of old simply supported beams into continuous beams.” China Civ. Eng. J., 42(6), 49–54.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 2 • March 2011
Pages: 275 - 285
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 2, 2010
Accepted: Jul 2, 2010
Published online: Jul 10, 2010
Published in print: Mar 1, 2011
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