Reinforced concrete filled steel tube pile-columns are structural elements commonly used in bridge supports in high seismic regions because RCFSTs provide increased levels of strength, ductility, and energy dissipation as compared with traditional systems such as reinforced concrete (RC) or steel substructures. This study includes experimental and analytical studies that considered three main parameters: the diameter-to-thickness (D/t) ratio, the above-ground length (La), and the soil stiffness.Alaska Department of Transportation and Public Facilitie
