Abstract
To investigate effects of the shaft and wing diameters of single wing pile on bearing capacity and pull-out resistance under alternately cyclic vertical loading, monotonic and cyclic vertical loading tests were conducted on a straight and wing piles having different shaft and wing diameters in sand under centrifugal acceleration of 30G. The results show that before the shaft friction reaches the ultimate value during cyclic vertical loading, the pile tip resistance and the shaft friction are the main components resisting the vertical load, so that the effects of the shaft diameter is dominant in the pushing direction and the effects of the shaft diameter and wing ratio (the ratio of wing diameter to shaft diameter) are dominant in the pulling direction. Thereafter, the pile tip resistance and the wing resistance are the main components resisting the vertical load, so that the effects of the shaft and wing diameters are dominant in the pushing direction and the effects of the wing ratio and the wing area are dominant in the pulling direction.
