Superstructure-foundation interaction considering settlement during a large earthquake -Effects of shear walls on stress of piles-

Abstract

Shear walls are earthquake-resistant elements in buildings. Superstructures and foundations are generally designed separately. The knowledge of the effects of shear walls on pile stress is limited. In this study, to investigate the effects of shear walls on the stress of piles, centrifuge tests and numerical analyses of the soil-pile superstructure for frame and shear wall structures were performed. The following results were obtained: 1) For the frame structure, the bending moments at the pile heads in the middle rows were larger than those in the front and tail rows. This was because the rotational restraint of the pile heads in the middle rows was higher than those in the front and tail rows. 2) For the shear wall structure, the bending moments at the pile heads in the middle rows were as large as those in the front and tail rows. The bending moment in the middle rows caused by the vertical forces was opposite to that caused by the horizontal forces because of the rotation of the footing beam beneath the shear wall.