A comprehensive investigation into the side and tip resistance model factors of barrette piles at the serviceability to ultimate limit state under compression loading was conducted using 64 load test data, which were categorized into drained and undrained soils. Nine interpretation methods were used to interpret the measured capacity from the load–displacement curves. The model factors for side and tip resistances were determined using various interpretation methods to implement the reliability-based design (RBD). For side resistance, the L1 method is recommended for serviceability, yielding the lowest model factors. In drained soils, the remaining methods resulted above 1.0, with displacements of 16 mm to 75 mm. In an undrained α method, the DeBeer method closely approximated the predicted capacity at 16 mm displacement, while several interpretation methods approximated the predicted capacity for undrained β method, with model factors varying from 0.95 to 1.03 at displacements ranging from 16 mm to 32.7 mm. For tip resistance, the measured capacities yield lower values than the predicted tip capacities. Bias and dispersion ranged from low to high for side resistance and medium to high for tip resistance. Hyperbolic model factors 'a' and 'b' can be used to calibrate resistance factors for RBD at serviceability limit states.
Chen et al. (Wed,) studied this question.