Abstract：Flexural tests on six prestressed concrete pipe piles with hybrid reinforcement (PRC pipe pile) and three prestressed high-strength concrete (PHC) pipe piles were carried out in this study. The effects of non-prestressed reinforcement on the flexural behavior of PRC pipe pile were investigated. It was revealed that the introduction of non-prestressed steel bars could significantly increase the flexural capacity and was remarkably beneficial to controlling the propagation of flexural cracks. Compared to the test data, the calculated values from the existing formulas of flexural capacity, which are generally complicated, are reasonable and valid. To determine the flexural capacity of PRC pipe piles, the annular cross section was converted equivalently to I-shaped section, and the equivalent steel strip method was used to calculate the axial force and bending moment of the steel bar. Furthermore, a simplified formula for calculating flexural capacity of both PHC and PRC pipe piles was developed, and the calculated results based on the formula lead to reasonable agreements with the test results. Compared to the existing design formulas, the simplified formula is simple and convenient in calculation, and hence, it can be applied to the design of PHC and PRC pipe piles.
