Abstract
To study the bond strength and confinement friction at the interface between the pile and bedrock, pull-out tests were conducted both in the laboratory and in the field. It was confirmed from these tests that the bond strength and confinement friction obtained from them is larger than the design bond strength and confinement friction set beforehand in reference to the API and other standards. Furthermore, as a method of estimating the pull-out resistance of the pile, a structural analysis of a bar model with non-linear shear springs was devised and applied to the field pullout test case. The results of the analysis showed that the analytical and experimental values agree well with each other, thus indicating the appropriateness of this analysis.
