Software para dimensionamento à flexão de vigas de concreto protendido com armadura ativa não aderente

Abstract

This study presents the development of software for the flexural design of rectangular prestressed concrete beams post-tensioned with unbonded tendons. The computational tool evaluates prestress losses, including both immediate and time-dependent losses, as well as their effects on serviceability and ultimate limit state verifications. The software was implemented in C++ based on the procedures established by ABNT NBR 6118:2026 and on the calculation report prepared by civil engineer Pedro Henrique Cabral, which was adopted as a reference for validating the results. Initially, the theoretical principles of prestressed concrete and the main mechanisms responsible for prestress losses are reviewed. Subsequently, the analytical models and calculation procedures used to determine immediate and time-dependent losses are presented. The serviceability and ultimate limit state verifications are then performed. As a result, this study systematizes a calculation procedure for the flexural design of beams with unbonded prestressing and provides a computational tool capable of automating the calculation stages, facilitating the analysis of results, and supporting the comparison of different design conditions. The software is intended for use by engineers, structural designers, and students in the field of concrete structures.