Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32826
Title: Long-term behavior of prestressed old-new concrete composite beams
Authors: Wang, WW
Dai, JG 
Li, G
Huang, CK
Keywords: Creep
Incremental model
Long-term deflection
Old-new concrete composite beam
Old-to-new concrete interface
Prestress
Prestress loss
Shrinkage
Issue Date: 2011
Publisher: American Society of Civil Engineers
Source: Journal of bridge engineering, 2011, v. 16, no. 2, p. 275-285 How to cite?
Journal: Journal of bridge engineering 
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 260days. 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.
URI: http://hdl.handle.net/10397/32826
ISSN: 1084-0702
EISSN: 1943-5592
DOI: 10.1061/(ASCE)BE.1943-5592.0000152
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