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VASCONCELOS, G.M.A. (2005). Simultaneous verification of the ultimate limit states and of serviceability in nonlinear analysis of reinforced concrete beams subjected to pure bending. M.Sc. Dissertation – Engineering School at Sao Carlos, Sao Paulo University, Sao Carlos. The present work deals with dimensioning and verification of the safety conditions of reinforced concrete structural elements, taking into account the material non-linearity. It includes a new proposal for the simultaneous verification of the ultimate limit states (ULS) and the serviceability limit states (SLS) for reinforced concrete bending elements, enhancing Finite Element applications with physical nonlinearities. The alternative proposals for the material safety factors include the use of mean values for the stress-strain relationships and the strength of materials; reference values that allow the composition of global safety coefficients that do not dependent on the type of failure, brittle in the concrete or ductile in the steel and, finally, means values for the concrete and steel stress-strain relationships, keeping the stresses always lower than the design strength values. Rectangular and T-type cross-sectional areas in pure bending were analyzed, using the alternative proposals. Statically determinate and hyperstatic beams were also studied to verify the safety conditions, including the redistribution of the internal forces in the hyperstatic cases. According to the analyses performed it is apparent that the third proposal is the most adequate and satisfies simultaneously the ULS and SLS verifications, being viable for practical applications.

Verificação simultânea dos estados limites últimos e de serviço em análises não-lineares de peças de concreto armado submetidas à flexão pura