Efeitos da temperatura nas deformações por fluência do concreto

Abstract

A concrete member, kept under sustained compressive loading, presents progressive contraction over time, associated to creep. In reinforced concrete Beams, such kind of deformations cause mass of concrete compressive stress decrease and reinforcement steel bars stress increase and may induce them to yielding. The pioneering formulations describing the phenomenon, developed on the base of creep coefficient are applicable, especially, when the stress magnitude remains constant. Its application to reinforced concrete members, which exhibits change in the stress magnitude over the highlighted phenomenon manifestation course, requires simplifications of what result the memory models, which have the disadvantage of requiring the storage of the stress history. The state models provides such robustness of storage, that’s why, they are developed from the integrating scheme changing. The subject of this work is the analysis of the effect of the influent factors on the creep deformations in reinforced concrete thin walled columns and beams, over all, the temperature effects, carried out on the base of a state model, fixing its physical parameters from the NBR 6118/2014 proceedings.