Influence of Poisson’s effect on uplift coefficient considering tip resistance

Uplift coefficient, the ratio of the friction resistance for uplift and compressive piles, has been documented widely by a number of authorities around the world. It is more appropriate and realistic to include the influence of the tip resistance in the calculation of the uplift coefficient. In this respect, the uplift coefficient associated with the Poisson’s effect is corrected, and the formulas for pile head load under tension and compression are obtained. The method to predict the pile head load for pile head in multilayered soil is also presented. In addition, the influence of several factors on the uplift coefficient is also examined to provide better insight into it.