The main loads applied on the drilled shafts are axial compressive loads. It is important toknow how many percent of the maximum applied load will be shed in side friction and howmuch will be transferred to the base. Part of the axial load carrying capacity of the drilled shaftis resisted by the soil below the tip of the shaft which is tip resistance and the other part isresisted by the friction developed around the drilled shaft which is side resistance. The axialcapacity of the drilled shaft foundation is influenced by the size of the drilled shaft, and soilcharacteristics. In this study, the effect of the size and soil characteristic will be investigatedon the contribution of side resistance and end bearing capacity. Also, the study presents athree-dimensional finite element modeling of a drilled shaft subjected to axial load usingANSYS12. The top displacement and settlement of the drilled shaft are verified withanalytical results. The soil profile is considered as Table 1 and for a drilled shaft with 7 ftdiameter and 95 ft length the stresses in z-direction are calculated through the length of theshaft. There is a good agrrement between analythical and finite element results in contributionof side resistance and tip resistance for the drilled shaft.
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