Numerical Simulation Research on Shear Capacity of PHC Pipe Pile with Large Diameter

On the question of the shear capacity of PHC pipe pile, different calculations were proposed in the current specifications and collective drawings. In order to explore the ultimate shear capacity of PHC pipe pile with large diameters, ABAQUS numerical simulation software was used to analyze the shear capacity of PHC pipe pile which was commonly used in engineering and has large diameters (600~1 000 mm), on the basis of the calculation results of the current specifications and the results of previous experiments. By analyzing the shear capacity of concrete and stirrup on the failure surface with shear span ratio of 1.5~3.0 and during shear compression failure, the major conclusions were as follows: the shear capacity of pipe pile showed a fluctuating decline during the decline process; the pipe pile’s maximum shear capacity was not synchronized with the failure of the pipe pile; when the maximum shear capacity is reached, the tensile cracks had occurred in the concrete upper neutral axis of the pipe pile. With the progress of displacement loading, when the tensile cracks were basically penetrated, the pile concrete had destroyed, the stirrup stress had increased, and the stirrup had yielded but the stirrup did not break. Finally, a formula for the shear capacity of PHC pipe pile was proposed on the basis of the current formula and the 45° fracture surface assumption.