Verificação de flechas em vigas de seção retangular: implementação computacional para o auto aprendizado..

Abstract

Cracking is an inevitable phenomenon in reinforced concrete structures, caused by various factors such as tensile stresses surpassing the material strength, execution errors, and deficiencies in materials. This work addresses the importance of structures meeting requirements beyond economic and aesthetic aspects, emphasizing load-bearing capacity, performance in service, and durability. The focus of this work is on the Excessive Deformation Limit State (ELS-DEF), which depends on the sizing of the cross-section, determination of longitudinal reinforcement due to pure bending, and the final detailing, i.e., the distribution of steel bars in the section. The work improved previously developed spreadsheets, providing a more intuitive interface to facilitate self-learning. General objectives include configuring a system for self-learning through spreadsheets, determining longitudinal reinforcement due to pure bending, detailing the quantity of reinforcement, and checking deflections in rectangular section beams. The study involves a literature review, spreadsheet enhancement, and automation of calculations. Various aspects of sizing are explored, including Simple Reinforcement, following ABNT NBR 6118:2023, and Double Reinforcement, necessary when the flexural moment exceeds the established limit concerning maximum curvature to ensure the ductility of the element. Deflection analysis (ELS-DEF) considers the non-linear behavior of concrete due to cracking in Stage II. This work restricts the dimensions of the beam base to 30 cm, presence of two-legged stirrups, and the possibility of a centralized trench for vibrator passage, if needed.