ANÁLISE DE SENSIBILIDADE DOS PARÂMETROS GEOTÉCNICOS DE UM RADIER ESTAQUEADO MODELADO UTILIZANDO O MÉTODO DOS ELEMENTOS FINITOS

Abstract

The sensitivity analysis of the variables associated with the modeling of a piled raft, square and with 16 piles is performed using the Finite Element Method. The numerical modeling of the foundation and the soil uses the concepts of plane state of deformation and model symmetry. Three elements: PLANE82 (with eight nodes and two degrees of freedom for node), CONTA172 and TARGET169 (with three nodes and two degrees of freedom for node) are used in modeling the soil-foundation system at ANSYS, being the first used for modeling the soil and foundation, while the second and third elements used for modeling the soil-foundation contact. The model’s random input parameters are implemented using the Monte Carlo method. The input variables include the geometry of the foundation, mechanical properties of the concrete and physical indexes and shear strength of the soil in the undrained condition. The maximum resulting displacement suffered by the system is the only random output variable under study. The numerical results obtained with the deterministic model, disregarding the uncertainties in the input variables, are compared with that of the scientific literature for validation. In addition, the model considering uncertainties indicates that the length of the piles and the elasticity modulus of the soil are the variables with the greatest influence on the modeling of the system, in other words, the greater the length of the piles and the elasticity modulus of the soil, the smaller is the displacement suffered by the piled raft and the soil.