Estudo da capacidade resistente do contato de elementos pré-moldados de fundação

Abstract

Precast concrete elements are widely used in the construction industry to make better use of materials and improve the quality of execution. Pressed piles, used for reinforce and executing foundations, are made up of precast concrete segments interconnected by direct bearing. The behavior of the precast concrete structural system is directly influenced by the technique adopted for the joints between the elements. It is known that the contact face between the segments must be perfectly flat for the execution of pressed piles. This study analyzed the influence of joints on the compressive strength of concrete segments used in the execution of pressed piles. The study was carried out at the Materials and Civil Construction Laboratory (LMCC) of the Federal University of Mato Grosso do Sul (UFMS) and its results were defined in terms of the concrete's compressive strength. The models used were made using the same techniques for preparing the segments used in the execution of pressed piles. The resistance capacity of the segments analyzed decreased considerably with the presence of the joint, influenced mainly by the conditions of the transverse faces of the elements in contact. The loss of strength of the models that simulated the joint between the pressed pile segments was around 20% when compared to the strength of the monolithic segments. The models tested did not achieve the mechanical efficiency found in the compressive strength of the concrete specimens used to prepare the pressed pile segments. In order to obtain better structural use of the system and mitigate losses, better control was recommended when making the pressed pile segments.