Full-scale experimental study of the seismic performance of pretensioned spun high-strength concrete piles

Pretensioned spun high-strength concrete (PHC) piles have been widely used in the pile foundations of buildings soft soil areas due to their high axial bearing capacity and good economic benefit. However, behavior PHC under lateral loading is generally poor this restricts application high-intensity seismic regions, especially for high-rise buildings. The existing research on performance cyclic with presence force scarce. In paper, systematically evaluated through full-scale tests numerical simulations. Lateral two specimens were conducted different ratios, performances examined terms cracking pattern, failure mode, hysteretic characteristics, capacity, ductility, stiffness degradation energy dissipation capacity. A dedicated finite element (FE) model was then developed using software DIANA compute piles, verified against experimental results. Using FE model, parametric analyses carried out study effects ratio, prestressing level tendons, longitudinal reinforcement wall thickness body distributed pattern tendons piles. results show that ratio has a significant effect mode piles; an increase leads but decrease deformation controlled by rupture lower ratios (less than 0.15) crushing higher (greater 0.15). Increasing tends improve overall ratios.