Reliability Analysis of Bearing Capacity of Inclined Prestressed Concrete Pipe Pile

The incline of a prestressed concrete pipe pile induced by the incorrect excavation and incorrect heap of soil will change pile behavior and thus present a problem for determining the bearing capacity of the inclined pile. Aiming to solve this problem by analyzing the failure mechanism of inclined piles, the failure modes of inclined prestressed concrete pipe piles are divided into flexure failure and shear failure to establish the limit state equations accordingly. Based on structural reliability theory, by introducing JC-Method, a new method to calculate the reliability index of bearing capacity of inclined pile is proposed by MATLAB programming and the bearing feature of inclined pile is discussed. Combining with practical engineering, it’s concluded that the main factors affecting the reliability index of inclined pile bearing capacity are pile side resistance, pile declination and external diameter. Also, there exists specific thresholds of wall thickness and prestress that allows the reliability index of an inclined pile bearing capacity to change acutely when wall thickness or prestress is less than the specific threshold. In particular, the side resistance and tip resistance most obviously affects the reliability index of inclined pile bearing capacity when the slope of the line is smaller than 0.04. The main factor that affects bearing capacity of an inclined pile is the cracking bending moment when the load is lower than 1300kN.