Modelagem de pilares-parede de concreto armado: estudo paramétrico visando recomendações para o projeto estrutural

Abstract

Reinforced concrete shear walls, or structural walls, can be a challenge during structural design, due to the non-linear behavior of the materials associated with a geometry of complex analysis. The structural design standard recommends considering displacements caused by the shear force and nonlinear behavior of reinforced concrete in the structural analysis of walls. Considering the difficulties inherent to this simulation, this work contributes to the structural analysis of these elements, providing answers for the structural consideration of such behavior. Therefore, it is opportune to use simulations with shell and solid finite elements to represent observed complex effects, such as the interaction between axial and tangential forces. The Opensees and ABAQUS® softwares are used, since they already integrate the necessary packages. The experimental comparison is used to make the calibration representative. The tests described in the literature on slender structural walls are considered here, in which the shear force is relevant, but the behavior is still governed by bending. The experiments are mostly cyclical, while the modeling is monotonic; therefor, a simplification is used to compare them using the backbone curve. The calibration suggests values for the CDP (Concrete Damaged Plasticity) constitutive model, calibrated to mainly simulate the ductility, since the initial rise curve is insensitive to the values adopted according to the results observed here. The expressions are obtained for yield lateral strength, peak lateral strength, stiffness in service, yield displacement and maximum displacement using linear regression. The displacement expressions have a weak coefficient of determination and the other variables expressions have large. The secant stiffness obtained agrees reasonably with the ACI 318 standard, however the stiffness still depends on reinforcement ratio used.