Finite Element Analysis of the Time-Dependent Behavior and Prestress Losses in Recycled Aggregate Concrete Beams
conference paper
The incomplete understanding of creep and shrinkage effects in recycled aggregate concrete (RAC) on the long-term structural behavior hampers its full utilization in prestressed concrete structures. Time-dependent structural finite element analysis may offer this insight, provided that it is fed by accurate shrinkage and creep models. This paper validates such approach against results of experiments on prestressed beams with varying prestress levels, concrete mixtures and recycled concrete aggregate (RCA) content. The creep compliance and shrinkage functions are calibrated using material test data. Comparisons between the test and numerical results show good agreement in deflection rates and time-dependent prestress level, although the immediate response under the superimposed load turns out to be underestimated. The predicted total prestress losses for the beam tests with RCA contents of 0%, 50% and 100% are 15.2%, 17.1% and 19.8%, close to measured values. The proposed modelling approach can serve as solid basis for design and analysis of prestressed RAC elements. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025
Topics
TNO Identifier
1005585
ISSN
23662557
ISBN
9783031806711
Publisher
Springer Science and Business Media Deutschland GmbH
Source title
Lecture Notes in Civil Engineering, 4th fib International Conference on Concrete Sustainability, ICCS 2024, nan, 11 September 2024 through 13 September 2024
Editor(s)
Barros, J.A.O.
Cunha, V.M.C.F.
Sousa, H.S.
Matos, J.C.
Sena-Cruz, J.M
Cunha, V.M.C.F.
Sousa, H.S.
Matos, J.C.
Sena-Cruz, J.M
Pages
186-194
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