Analyse de la stabilité au feu des murs en béton armé par l'approche calcul à la rupture

Abstract : High rise reinforced concrete walls under fire exhibit important out-of-plane displacements, which in turn lead to an eccentricity of the self-weight with respect to the initial undeformed configuration, resulting in supplementary bending moments. This geometrical change, combined with the degradation of the stiffness and strength properties of reinforced concrete due to severe temperature increase, may lead to the failure of walls under fire.Investigation on fire resistance of reinforced concrete walls will be based on the yield design approach in order to analyze the global stability of high rise walls, taking into account the geometry changes induced by the thermal loading.The program consists of two parts.Firstly, a 9-meter high reinforced concrete wall has already been tested under fire with the equipment Vulcan. This full size experiment aims at validating the modeling of plates under large out-of-plan displacement and identifying potential local phenomenon which has not been considered in the model.Secondly, a yield design approach will carried out to analyze the stability of reinforced concrete walls. By using the perturbation method, a recursive analytical procedure based on a kinematic approach is proposed to find the deformed configuration of reinforced concrete walls under fire. The deformed configuration will be later modeled as a shallow shell, on which a yield design procedure will be performed by a non-linear optimization
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Mingguan Yang. Analyse de la stabilité au feu des murs en béton armé par l'approche calcul à la rupture. Mécanique des matériaux [physics.class-ph]. Université Paris-Est, 2018. Français. ⟨NNT : 2018PESC1169⟩. ⟨tel-02297575⟩

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