ANALYTICAL AND EXPERIMENTAL RESPONSE OF SINGLE PILE TO PURE TORSION

Generally, the piles are designed depending on vertical and horizontal loading. The torsional load has a significant impact so it should be taken into account. The torsional loading occurs due to eccentric of lateral load on the pile foundation. The present work is extinguished experimentally and analytically investigating the response of a single steel pile under pure torsional load at pile head. The results show the response of the pile under torsional loading is dependent on two factors. These are section's mass distribution and type of soil. The clay soil is very sensitive to torsion load, meanwhile, sand soil and rectangular sections have the capability to bear torsion load more than circular sections. The fixity length for pile under pure torsion is about 0.3 to 0.5 pile length for pile embedded in clay and sandy soil and the critical length for pile under pure torsion is 0.2 to 0.3 pile length for pile embedded in clay soil and from 0.3 to 0.5 pile length for pile embedded in sand.