Research on the Mechanical Properties of C100 Ultra-High Strength Double Layer Reinforced PRC Pipe Pile

Full-scale model bending performance tests and finite element modeling analysis were conducted on C100 double-layer reinforced pipe piles to meet the high bending bearing capacity requirements of certain special engineering projects. The results show that: The cracking moment and ultimate bending moment of the prepared C100 double-layer reinforced PRC pipe pile reach 1648.66kN·m and 4025.10 kN·m, respectively. Compared with the PRC I-1000 C-type pile with higher bending performance among the existing standard pipe pile products, the bending performance of C100 double-layer reinforced PRC pipe pile improve significantly. The failure form of pipe piles is manifested as the steel bars in the tension zone yielding first, and the concrete in the tension zone exits the work after cracks appear. Then, the concrete cracks in the tension zone rapidly develop and expand to a ductile failure of 1.5 mm. The theoretical calculation values of cracking bending moment and ultimate bending moment are slightly smaller than the test results, and the finite element computing results are in good agreement with the test results. The applicability of normative formulas and finite element analysis to large diameter double layer reinforced C100PRC pipe piles is verified.