Abstract
This study evaluates pre-bored precast concrete (PC) piles performance by compiling 83 compression load tests, named CYCU/PreboredPC/83 database, which is the first of its kind. The load-displacement behaviour was evaluated consistently using various methods to interpret the capacities and corresponding displacements. The capacities and displacements are normalised by the L-2 method to investigate the relationships between the interpretation methods. The L-1 method is suitable for estimating capacities at the serviceability limit state (SLS), while other methods proved effective for the ultimate limit state (ULS). Similar mobilisation behaviours with driven piles in drained soils and barrette piles in undrained soils were observed. Side resistances were calculated using the alpha and beta methods and tip resistances were calculated using the bearing capacity theory. Model factors (ratio of measured and predicted capacities) were generally unconservative (Q(p) > Q(m)) except when Q(m) is defined by the van der Veen, Fuller and Hoy, and Chin methods. The bias dispersion is classified as "medium", comparable with those of drilled shafts and barrette piles. These model factors are necessary for reliability-based design (RBD) at the ultimate limited state. For the serviceability limit state, hyperbolic model factors are evaluated.