Lateral Resistance of Steel Pipe Pile with Wings by Static Cyclic Loading Tests

Steel pipe piles subjected to lateral loads exhibit toughness even after yielding of the steel, and thus possess a high earthquake resistance. A steel pipe pile with wings attached to its tip can be driven into the ground by rotation. However, because the wings are larger than the pile diameter, the soil around the pile shaft is loosened, resulting in an alteration of the lateral subgrade reaction of the pile. In the present study, static lateral loading tests were conducted to ascertain how the lateral resistance of a pile was affected by the attachment of wings and the wing diameter, and to examine the occurrence of secular change after one year.