This　study　investigates　the　inelastic　displacement　of　structures　subjected　to　earthquake-tsunami　loadings.　The　relative　intensity　is　defined　as　the　ratio　of　the　tsunami　force　per　unit　mass　to　the　S-a　of　the　corresponding　ground　motion.　The　effects　of　the　hysteretic　model,　soil　condition,　post-yield　stiffness,　damping,　and　relative　intensity　on　the　inelastic　displacement　ratios　are　investigated.　The　results　show　that,　compared　to　earthquakes　alone,　earthquake-tsunami　loadings　can　enlarge　the　inelastic　displacement　ratio　demands,　especially　for　higher　relative　intensities.　A　predictive　model　is　developed　by　considering　several　parameters,　which　may　be　used　in　the　framework　of　performance-based　seismic　design.