Seismic performance of glass fiber reinforced polymer tube confined prefabricated concrete pier

To improve the structural performance of prefabricated concrete piers under earthquake, two different thicknesses glass fiber reinforced polymer (GFRP) tube confined piers (SPCG1, SPCG2) and one unconfined contrast pier (SPC) were designed and manufactured. The column and cap were prefabricated and assembled by grouting sleeve. The pseudo-static test results show that GFRP tube confinement effectively improves the failure of plastic hinge zone and the seismic performance of the prefabricated concrete piers. Compared with SPC, the ultimate displacements of SPCG1 and SPCG2 are increased by 23.2% and 30.9%, the ductility coefficients are increased by 16.7% and 54.6%, the residual bearing capacities at 7% drift ratio are increased by 103.3% and 90.4%, and the residual displacements are decreased by 21.4% and 32.0%. The proposed damage quantization interval and qualitative description of this type of precast pier can provide reference for relevant engineering applications.