OPENSEES SIMULATIONS OF AXIAL BEHAVIOUR OF SINGLE-HELIX PILES

Weidong Li, Lijun Deng

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Foundations II / Fondations II

ABSTRACT: Helical piles are widely used in Western Canada for many engineering applications. Soil-helical pile interactions are important for the helical pile industry and have been conventionally investigated using continuum finite element analyses, which require sophisticated modeling of soils and piles. The present research conducted simplified numerical modeling of soil and single-helix pile systems on the platform of the Open System for Earthquake Engineering Simulation (OpenSees). The numerical model adopts the beam-on-nonlinear-Winkler-foundation (BNWF) method for simulating soil-pile interactions. Soil reactions to piles are simulated by a series of q-z, t-z, and p-y springs. The numerical modeling is used to calibrate the performance of in-situ helical piles under axial loads and to understand the load-transfer mechanism during in-situ loading tests. Cone penetrometer tests (CPT) results of each test site are used as the input to parameters of the numerical models. Preliminary results showed that the BNWF method could properly simulate the capacities and load-displacement behavior of single-helix piles.

RÉSUMÉ: Les pieux vissés Les interactions sol-pieu vissé sont importante et ont été étudiées géléments finis, ce qui requiert une modélisation complexe des sols et des pieux. Pour la présente étude, la modélisation numérique simplifiée des systèmes de sol et pieu vissé System for Earthquake Engineering Simulation). Le modèle numérique adopte la méthode de poutre sur fondation Winkler non linéaire (BNWF, beam-on-nonlinear-Winkler-foundation) afin de simuler les interactions sol-pieu. La réaction du sol est simulée par une série de ressorts q-z, t-z et p-y. La modélisation numérique est utilisée pour calibrer la performance de pieux vissés en place soumis à des charges axiales et pour comprendre le mécanisme de transfert de charge pendant les essais de charge en place. Pour utilisés comme paramètres pouvait correctement simuler les capacités et courbes charge-déplacement des pieux à hélice unique.

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