Lateral and uplift static load tests of precast concrete pile

Abstract

: In order to perform environmental construction, eliminating the dust contamination caused by welding reinforcement cages and blending concrete onsite, as well as diminishing the noise pollution caused by striking precast piles, three non-displacement precast piles subjected to lateral loading and another three that were subjected to vertical uplift loading were tested. The lengths of these tested piles were 24.7m, 26.6m and 28m with the same cross-section. The soil was removed before these piles were placed in the required location. The horizontal and vertical movements of these piles under cycling loading and progressive loading were investigated through static load tests. Furthermore, six pairs of vibration wire strain gauges were welded in one pile which was applied with uplift loading for load transfer observation and shaft resistance analysis. Results suggest that the critical and ultimate loads of lateral loaded piles and ultimate loads of uplift loaded piles increase with the pile length, and in the pile with the welded gauges, that the axial force decreases with depth along the pile, increasing with applied loads provided by hydraulic jacks. In addition, the distribution of unit shaft resistances is determined and the propagations of friction resistances are analyzed.