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- W2898859426 abstract "This thesis is a contribution to the modeling of the spatial variability of tensile strength of concrete structures, at different scales, and its influence on concrete cracking pattern. Particularly, a size effect law and random fields are used through two approaches:On the one hand, an analytical probabilistic approach of the Weakest Link and Localization (WL2) method is proposed. This method estimates the distribution of the tensile strength, at different scales, accounting for the stress redistributions around the weakest point.It depends on a scale length, whose identification is discussed. This scale length accounts for spatial randomness of the concrete tensile strengthOn the other hand, another contribution of this thesis is the development of a Stochastic Finite Element (SFE) method, used to model both size effect and the spatial variability of the tensile strength. The method consists first on defining a random field, using the mean tensile strength estimated from the analytical approach of WL2. Then, discretized autocorrelated random field realizations are generated. Moreover, the choice of autocorrelation parameters, used to define the random fields, is discussed.The applicability of both methods is evaluated using various experimental series exhibiting particularly statistical size effect. Furthermore, the SFE method is used to complete the simplified FE model of a 1/3 mock-up of a double-wall containment building. The uncertainties on the tensile strength, at this scale, are modeled using independent autocorrelated random field at each scale. Uncertainties propagation, at initial state, shows its pertinence in the estimation of crack positions." @default.
- W2898859426 created "2018-11-09" @default.
- W2898859426 creator A5059062596 @default.
- W2898859426 date "2017-09-18" @default.
- W2898859426 modified "2023-09-23" @default.
- W2898859426 title "Effects of heterogeneity of concrete on the mechanical behavior of structures at different scales" @default.
- W2898859426 hasPublicationYear "2017" @default.
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