Análise da fissuração e das condições de vinculação de vigas pré-moldadas de concreto: estudo de caso

Abstract

One of the major challenges in construction works is to execute the project within the estimated time. During project execution, delays can occur with either material delivery or even unfavorable weather conditions, such as rain. For these and other factors, it is often necessary to seek techniques that optimize production time, one of which is the use of precast structures. In order to analyze the appearance of cracks that may occur in the precast elements, the present work makes a case study of a beam that was initially calculated for conventional concrete, but as in at least 50% of the cases mentioned in technical literature, it was decided to use the precast concrete. Due to the change in the constructive method, it is necessary to verify the cracking for the different transient situations considered during the process of manufacturing and assembling the beam. The importance of avoiding cracks is due to the occurrence of both aesthetic and structural problems, which may compromise the durability and safety of the structure. The results show that the changes in the binding conditions, as well as the loading, must be properly considered in project, as they may interfere with the level of cracking of the element.