Projeto de laje maciça protendida em sistema de pós-tração não aderente

Abstract

Prestressed concrete has become an efficient structural solution for buildings that require larger spans and greater architectural flexibility, especially when compared to conventional reinforced concrete systems. In this context, this study aims to analyze, design, detail, and compare the structural performance of a floor slab composed of a solid prestressed concrete slab with two reinforced concrete structural configurations, considering different arrangements of beams and columns. The adopted methodology was based on bibliographic and normative research, with emphasis on ABNT NBR 6118:2023, combined with structural design using the commercial software Eberick®. Serviceability and Ultimate Limit States were evaluated, as well as the main design indices, including concrete, steel, and formwork consumption, in addition to deflections and internal forces. The results indicated that the removal of internal beams and columns in reinforced concrete slabs leads to a significant increase in slab thickness and material consumption in order to meet normative performance criteria. Conversely, the solid prestressed concrete slab demonstrated higher structural efficiency, allowing for reduced thickness, improved control of deformations, and better utilization of the resistant material, while remaining within the prescribed code limits. It is concluded that the use of solid prestressed concrete slabs represents a technically viable and efficient alternative for floors with large spans, provided that normative requirements are met and appropriate design and execution control is adopted.