Análise confiabilística dos estados limites de serviço de vigas de um edifício de pequeno porte em concreto armado

Abstract

The constructive systems of reinforced concrete have inherent uncertainties in relation to its executive method, to physical, chemical and biological phenomena, as well as to the loads acting on buildings. Thus, the knowledge and characterization of the random variables of the projects of reinforced concrete structures are extremely important for the development of efficient solutions that meet the safety and service requirements for which they were designed. For the development of safety analyses, are used different limit state equations determined from the failure modes existing in the structures. Concepts of probability and statistics linked to reliability methods are used to determine the probability of failure, allowing the evaluation of the structural ruin risk of the analyzed elements. In this context, the present work aimed to implement models for the evaluation of the reliability levels of reinforced concrete beams of a small building for the limit states of excessive deflection and excessive crack width. The failure probability calculation is performed using the Monte Carlo simulation method and the first-order reliability method (FORM). The structural integrity of the beams was evaluated, where the results were adequate when compared with the target reliability indices recommended by international codes. In most of the analyzed cases, low failure probabilities were found. However, the most requested beams showed results close to the admissible safety levels. Finally, with the content of this work it is expected to corroborate for the dissemination of reliability routines in the design practice of reinforced concrete structures.