PROPOSAL OF ADDING PILE METHOD WITH CONTACT STATE BETWEEN EXISTING AND ADDITIONAL FOOTINGS AND ITS RETROFITTING MECHANISM VERIFICATION

Abstract

 In this study, to improve the construction efficiency of seismic retrofitting for existing bridge pile foundation, the adding pile method with the face contact state between existing and additional footings was proposed, and its seismic retrofitting mechanism was verified using centrifuge experiment and frame numerical analysis. It was confirmed that the horizontal seismic force was transmitted from the existing pile foundation to the added pile foundation through the contact of the existing and added footings, and the horizontal seismic force acting on the existing pile foundation was largely reduced compared with the case without retrofitting. In addition, for the shear force was reduced, the bending moment of the existing pile foundation was also restrained.