Abstract:

The lengths of precast piles are normalised, and a reliable pile joint can facilitate the application of prefabricated retaining piles. In this study, the joint used for connecting the ends of prestressed concrete I-piles was composed of an L-shaped flange steel plate, a steel connection plate, and high-strength bolts. The shear failure mode and capacity of the joint were evaluated through shear tests, and a finite element model was established to simulate the shear failure process of the joint. Based on the experimental verification, the effects of the strength of concrete, the strength of the connecting steel plate, and the number of PC steel bars on the shear bearing capacity of pile joints were analysed through finite element simulation. The results showed that the three-dimensional fine numerical simulation considering plastic damage could predict the joint response. With the increase in the shear load, the connecting steel plate and top PC steel bars near the joint yielded before other parts. The variations in concrete strength and the number of top longitudinal PC bars significantly influenced the shear capacity of the joint. However, the increase in the yield strength of the connecting steel plate had no significant effect on the bearing capacity.

Key words: prefabricated pile joint, shear bearing capacity, shear test, numerical simulation