Análise comparativa de normas e códigos-modelos para o dimensionamento de vigas-parede por meio do método de bielas e tirantes

Abstract

Abstract Deep beams are structural elements widely used in civil engineering, integrating the functions of beams and walls to support both vertical and horizontal loads. Their application is fundamental in structures that require high strength and stiffness. Moreover, the use of deep beams allows the adoption of larger spans and reduces the need for intermediate columns, optimizing space u6liza6on and contribu6ng to the overall structural performance. The Strut-and-Tie Model (STM) is widely employed to represent the complex behavior of these elements, as it enables their design in an efficient and systematic manner based on a simplified structural model. However, the main references used in the design of concrete structures — NBR 6118:2023 (Brazil), ACI 318-19 (United States), and the fib Model Code 2010 (fib, 2013), an internationally recognized reference — present significant differences in both the formulation and the application of this method. In this context, the present study conducts a comparative analysis of the aforementioned technical references, aiming to understand the impact of their criteria. From this perspective, a case study is proposed in which examples of the design of statically determinate and continuous deep beams are presented according to the different normative approaches. Based on the results obtained, it was possible to identify the main methodological differences among the analyzed prescriptions, as well as to gain a deeper understanding of their respective advantages and limitations.