<p>The phenomenon of soil liquefaction poses a considerable geotechnical challenge, profoundly impacting the structural behavior of bridges following seismic occurrences. This study delves into the repercussions of soil liquefaction on integral abutment bridges (IAB) subjected to both near-fault and far-fault ground motions (GM). The analyses, utilizing the OpenSees computational framework, incorporated p-y springs to model the effects of soil liquefaction. Nonlinear time history analyses were conducted on a series of enhanced Winkler based models of single-span IABs exposed to 10 recorded near-fault and far-fault GMs. Centrifuge experiments proved the model’s capacity to assess pile foundations under seismic loads. The results indicated that liquefaction increased the maximum displacement and permanent displacement of abutments and piles by over 90% and decreased the maximum pile bending moment by over 60%, compared to IABs in non-liquefied soil. The distribution patterns of the bending moment and displacement along the pile depth changed, and the pile bottom constraints (fixed or pinned) significantly impacted the pile responses compared to IABs in non-liquefied soil. The response of abutments and piles increased under near-fault ground motions for IABs in non-liquefied soil, but the effects became less obvious for IABs in liquefied soil. Therefore, when the IAB is located in liquefied soil, it is advised to assume pinned constraints for the pile bottoms, which is more conservative, and far-fault GMs may pose greater challenges than those originating from near-fault GMs.</p>