Axial monotonic and cyclic performance of fibre-reinforced polymer (FRP) - steel fibre-reinforced helical pulldown micropiles (FRP-RHPM)

摘要

This paper presents the results of full-scale axial testing on fibre-reinforced polymer (FRP) - steel fibre-reinforced helical pulldown micropiles (FRP-RHPM). The piles were subjected to axial one-way cyclic and monotonic loads. The load distribution between the shaft and lead section and within the lead section was evaluated. It was found that loading history significantly influences the cyclic resistance of these piles; cyclic loads resulted in degradation of the shaft resistance, but resulted in an improvement of the lead section resistance. The overall pile cyclic response was found to stabilize after a few cycles of loading. The axial stiffness and capacity remained unchanged or increased after cyclic loading. The results show that FRPRHPM performs as a composite pile system, and that it is a viable option for cyclic loading applications.