Experiments and design of reinforced concrete friction piles by bearing capacity of the pile and soil base

Subject: friction piles in pile foundations and methods of their analysis. A disadvantage of the existing strength design of reinforced concrete piles is the assumption that the concrete and steel reinforcement reach the ultimate (design) stress simultaneously. A disadvantage of the design by soil bearing capacity is the transfer of the load to the ground via the friction forces that arise at the pile «failure» (movement), which should not be allowed in the structures since the pile must be fixed at the soil base. Research objectives: improve the reliability of the friction pile design in the soil base by the criterion of strength of reinforced concrete pile material and by the criterion of the soil base bearing capacity. Materials and methods: investigation of the friction pile response in the soil base using the results of experiments on a trial pile. Results: the article presents the equation for the design of reinforced concrete piles by strength and by the soil base bearing capacity criteria. The topic of design of friction pile is relevant because it is devoted to a deeper understanding of the pile response in the soil base and, on this basis, to the development of pile design methods by the pile’s material strength and the soil base bearing capacity criteria. Conclusions: reliability of pile design results and reliability of pile operation are increased; prerequisites for the development of new design standards are created.