Análise da confiabilidade de fundações por estacas do tipo hélice contínua através da previsão da capacidade de carga por métodos semi-empíricos

Abstract

In the actual scenario, the security of the foundations systems its pre-established through security coefficients which must be applied during the dimensioning, determining by nacional rule. Although the guaranty of safety these factors have to offer, its application doesn’t lead to consider random variables that influence direct and/or indirectly the final behavior of the system. Therefore, in the last years, one of the most ascending tools for dimensioning structures and foundations is a reliability analysis. With this, the present study makes an analysis of the reliability of foundation models dimensioned in continuous flight auger, through the verification of the reliability indexes and resulting failure probabilities. The analysis was done by creating distinct models, each with a specific diameter for the piles, being developed from semi-empirical methods of the load capacity prediction, allowing the comparison between them. In addition, the initial loads were increased, seeking the impact since increased reliability of the systems maintained with the initial dimensioned configuration. Finally, it is possible to verify the influence of the calculation method of resistances selected to size the foundation, the diameter used for that and the increase of the requests about the reliability of the foundation models created.