Finite element analysis of concrete plugs embedded in tubular steel piles

This study presents an evaluation of the nonlinear response of concrete plugs embedded in the steel tubular piles subjected to an axial pull-out force. An axisymmetric finite element model was developed for this purpose. Evidence of non-linearity and deviation from the classical linear elastic theory led to a more complex numerical solution to simulate the experimental behavior. The software DIANA was used for the nonlinear finite element analysis. The elasto-plastic model of the concrete plug was based on Drucker-Prager yield criterion. The finite element model was then calibrated against the experimental results. Satisfactory agreement was achieved between the recorded (test results) and computed (numerical analysis) load-slip responses, ultimate pull-out strength and longitudinal and hoop strain distributions along the steel tube