Seismic Design for Highway Bridge Foundationsby Ignatius (Po) Lam, Earth Technology Corp, Long Beach, CA, USA,
Geoffrey R. Martin, Earth Technology Corp, Long Beach, CA, USA,
Abstract: This paper focuses on the determination of stiffness characteristics of piles and pile groups. Both battered and vertical pile groups are considered. Recommended methods for determining the axial and lateral stiffness of single piles are presented along with sensitivity studies to demonstrate the influence of liquefaction and strength degradation on lateral stiffness. Solutions are presented showing how axial and lateral stiffness of individual piles may be combined to represent group pile stiffness to moment and lateral loading. Significant bending moments may be induced in laterally loaded battered piles. Seismically induced moment loading on a pile group may lead to permanent axial displacements.
Subject Headings: Stiffening | Pile groups | Lateral loads | Soil liquefaction | Bridge foundations | Piles | Moment (mechanics) | Highway bridges
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