Viga-parede: uma comparação entre diferentes métodos de dimensionamento

Abstract

Reinforced concrete is one of the most used structural systems in Brazil. The design of common reinforced concrete structures is well based on norm, however, with the need of larger constructions, with greater loads and often incompatibility in the project, the solutions found may require more than a common structure can withstand. In this paper, we sought to compare two design method for the same wall-beam structure, the Strut and Tie Method (STM) and the Stringer-Panel Method (SPM). The STM divides the structural element between struts and ties that form a truss inside the element, the ties resist to traction and the struts resist to compression, in the area where the model defines a tie a steel reinforcement must be dimensioned in order to resist the efforts. The SPM divides the structural element in struts and panels, in this model the struts resist to normal stresses and the panel resists shear stresses. A wall-beam was modeled for the two methods according to the geometry of the wall-beam, the reinforcements were dimensioned according to the literature and safety was verified with the parameters of NBR 6118 (ABNT, 2014). In the end, it was found that the SPM resulted in a reinforcement 181.25% greater than the result by the STM for the secondary horizontal reinforcement and 56.26% greater for the vertical reinforcement, mainly because the STM demands more transverse reinforcement and longitudinal reinforcement secondary to in order to resist the stresses on the panels.