Bazant, Z.P.

Hubler, M.

Wan-Wendner, Roman

English

Ghent University Academic Bibliography

EMI/PMC 2012 2012 Joint Conference of the Engineering Mechanics Institute and the 11th ASCE Joint Specialty Conference on Probabilistic Mechanics and Structural Reliability June 17-20 2012, Notre Dame, IN    UNCERTAINTY IN CREEP AND SHRINKAGE PREDICTION MODELS FOR CONCRETE   Roman Wendner1, Zdenek Bazant2 and Mija Hubler2 1Northwestern University, on leave from BOKU University 2Northwestern University Abstract The lifetime performance, and consequently the total life cycle costs of engineering structures, are significantly influenced by the accuracy of the prediction models used. For aging concrete structures,these are mainly deterioration models (chloride ingress, reinforcement corrosion,carbonation), as well as models for time-dependent changes in material characteristics,such as creep and shrinkage (CS). In the design phase, the prediction models govern not only the inherent safety level but also greatly affect the expected lifetime performance. For existing structures, they are a key element in the assessment of structural safety and the remaining life time. Although probabilistic performance assessment techniques and life cycle cost analyses are well established tools, suitable stochastic models for the input parameters are, for the most part, still missing. A recently expanded database of laboratory CS tests as well as multi-decade bridge deflection data became now available,making it possible to quantify the uncertainty of CS‑models embodied in the current design codes and standard recommendations. In this study, statistical indicators for the short-term and long-term predictions have been determined.They can be used for determining the safety levels associated with different code provisions and can improve the accuracy of probabilistic assessment methodologies. Furthermore, sensitivity studies for the main input parameters will be presented.  

Uncertainty in creep and shrinkage prediction models for concrete

https://biblio.ugent.be/publication/8637638/file/8637659

Uncertainty in creep and shrinkage prediction models for concrete

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Ghent University Academic Bibliography