Investigation on Corrosion of Welded Joint of Prestressed High-strength Concrete Pipe Piles

In this paper, the failure modes, the horizontal bearing capacity and horizontal bending stiffness of prestressed high-strength concrete (PHC) pipe piles with different corrosion degrees of joints under different axial compression are investigated by the pseudo static method. In analyses, the prestressing force is applied on pile piles by the cooling method, and some influence factors are considered, the plastic damage of concrete, the plastic deformation of reinforcement bars and other steel materials, and the corrosion degree of joints. Through comparative analyses of finite element analysis results of pipe piles with different corrosion degrees of joints under different axial compression, it is found when the corrosion degree of the welded joint is higher and the axial compression is lower, the horizontal bearing capacity and horizontal bending stiffness would be lower. when the corrosion degree of the welded joint and the axial compression is higher, the energy dissipation capacity of pipe piles would be lower. (C) 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the scientific committee of the 6th International Workshop on Performance, Protection & Strengthening of Structures under Extreme Loading