Optimal reinforcement design for the 2.5m-deep concrete slab foundation of the La Sagrera Station (Barcelona) considering temperature and drying shrinkage
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Document typeConference report
PublisherInternational Federation for Structural Concrete (fib)
Rights accessRestricted access - publisher's policy
La Sagrera Station (Barcelona, Spain) will be an intermodal station designed to deal with more than 100M of passengers per year; the construction works are expected to be finished by 2020. A deep (2.5 – 4.0 m) jointless reinforced concrete slab with a total surface of 40,000 m2 must be constructed. Reinforcement of this massive concrete slab is required, apart from the external design loads, to guarantee the cracking control due to temperature and shrinkage sharp gradients. In this regard, the code provisions suggest reinforcement amounts that seem not to be aligned with the particular boundary conditions (e.g., concrete composition, type and amount of cement, thermo-hygrometric environmental conditions, geometry and restrains) to which the slab will be subjected. Consequently, a specific experimental and numerical program has been performed aiming at optimizing the design. To this end, an initial experimental program involving the construction and monitoring (temperature and strains) of full-scale were produced considering different concrete dosages and reinforcement configurations. The results were used to determine the best technical-economic alternative and to calibrate a numerical model capable of simulating the temperature transfer/generation, humidity transfer and mechanical response of these elements. This model was posteriorly used to perform parametric analyses and to define the optimum reinforcement of the final deep-slab. The foundation is under construction and some parts are monitored and the results compared with the numerical predictions (with good agreement). The procedure and results of the whole experimental program are presented and discussed within this technical paper.
CitationMuñoz, J.; de la Fuente, A. Optimal reinforcement design for the 2.5m-deep concrete slab foundation of the La Sagrera Station (Barcelona) considering temperature and drying shrinkage. A: fib Symposium. "Concrete Innovations in Materials, Design and Structures: proceedings of the fib Symposium 2019 held in Kraków, Poland 27-29 May 2019". International Federation for Structural Concrete (fib), 2019, p. 796-803.
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