Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/app10144772
Keywords
prestressed concrete; concrete shrinkage; concrete creep; long-term behavior; prestressed box girder bridge; tridimensional FEM analysis
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Funding
- Italrom Inginerie Internationala S.r.l. (Lombardi Ingegneria srl, Via Giotto, Milan, Italy)
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This paper presents a general procedure for a rate-type creep analysis (based on the use of the continuous retardation spectrum) which avoids the need of recalculating the Kelvin chain stiffness elements at each time step. In this procedure are incorporated three different creep constitutive relations, two recommended by national codes such as the ACI (North-American) and EC2 (European) building codes and one by the RILEM research association. The approximate expressions of the different creep functions with the corresponding Dirichlet series are generated using the continuous retardation spectrum approach based on the Post-Widder formula. The proposed rate-type formulation is implemented into a 3D finite element code and applied to study the long-term deflections of a prestressed concrete bridge built in Romania, which crosses a wide artificial channel that connects the Danube river to the port of Constanta in the Black Sea.
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