Análise comparativa do dimensionamento de pilar-parede de concreto armado para diferentes resistências à compressão do concreto

Abstract

The shear-walls are bracing elements in a reinforced concrete structure, due to their great rigidity they absorb a large part of the efforts caused by the lateral movements of the structure caused by the lateral loads of earthquakes or wind mainly. With the development of cities, the demand for taller and slimmer buildings has increased and at the same time the technological advancement of materials has allowed smaller elements that have the same capacity to resist the efforts, making issues such as the global stability of the structures relevant. The studies of shear-walls began to have greater relevance from ABNT NBR 6118:2003, when it proposed a new calculation methodology, where the shear-wall is calculated by dividing it into strips and dimensioning it as isolated pillars, but does not address the reduction of stiffness in shear-wall, considering the effects of physical nonlinearity by multiplying reducing coefficients in the same way as common pillars, which may differ from the actual values for a cracked section of a shear-wall. The purpose of this work is to design a reinforced concrete structure and size the longitudinal reinforcement for one of the shear-wall inserted in the structure, according to ABNT NBR 6118:2014, for different concrete compressive strengths, and to evaluate the secant stiffnesses obtained through the moment-curvature diagram for the most requested section of each combination in each compressive strength range and compare with the values calculated from the reduction coefficients established by the same standard.