CYCLIC HORIZONTAL LOAD TEST OF PHC PILES WITH EARTHQUAKE RESISTANT JOINT UNDER AXIAL FORCE CHANGING CONDITION

Abstract

Results of cyclic horizontal load test of two PHC piles connected with a foundation slab under axial load change are discussed. One is a standard pile but the other, so-called earthquake resistant pile, has a new developed joint without welding at pile head. This idea is based on the experience of the Miyagiken-oki earthquake (1978) that the pile with joint accidentally at pile head because of overdriving was not damaged, while the other piles showed shear failure. As test results, horizontal force was concentrated to and resulted in shear failure of the standard pile because the joint shows high ductility.