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Effect of Short-Term Shrinkage on Deck Concrete of a Rail-Cum-Road Composite Truss Bridge

Effect of Short-Term Shrinkage on Deck Concrete of a Rail-Cum-Road Composite Truss Bridge
Autor(en): , , ,
Beitrag für IABSE Congress: Bridges and Structures: Connection, Integration and Harmonisation, Nanjing, People's Republic of China, 21-23 September 2022, veröffentlicht in , S. 291-300
DOI: 10.2749/nanjing.2022.0291
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Rail-cum-road truss bridges are rapidly developing, and frequent cracking in freshly poured deck concrete is of great concern. For the performance of such a load-bearing deck, it is necessary to un...
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Bibliografische Angaben

Autor(en): (Beijing University of Technology, Beijing, China)
(Beijing University of Technology, Beijing, China)
(Beijing University of Technology, Beijing, China)
(Taian High-tech Industrial Development Zone Management Committee, Taian, China)
Medium: Tagungsbeitrag
Sprache(n): Englisch
Tagung: IABSE Congress: Bridges and Structures: Connection, Integration and Harmonisation, Nanjing, People's Republic of China, 21-23 September 2022
Veröffentlicht in:
Seite(n): 291-300 Anzahl der Seiten (im PDF): 10
Seite(n): 291-300
Anzahl der Seiten (im PDF): 10
DOI: 10.2749/nanjing.2022.0291
Abstrakt:

Rail-cum-road truss bridges are rapidly developing, and frequent cracking in freshly poured deck concrete is of great concern. For the performance of such a load-bearing deck, it is necessary to understand its stress status due to short-term shrinkage. Taking a newly-constructed rail-cum-road truss bridge as the case project, this paper, by ANSYS finite element simulation, mainly analyzed the stress distribution in deck concrete under short-term action of shrinkage. Shrinkage of one deck panel and two companion specimens shortly after the concrete pouring was measured through in- situ testing. It was found that the free shrinkage of companion specimens at 40 days is 140~150 micro strains, significantly higher than that indicated by the current code. Under the action of short- term shrinkage, tensile shrinkage stress in the magnitude of 1,5~3,5 MPa is present in the deck, triggering potential cracking, and its effect shall therefore not be neglected.
Stichwörter:
Verbundfahrbahnplatte Finite-Elemente-Simulation
Copyright: © 2022 International Association for Bridge and Structural Engineering (IABSE)
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