In Integral Abutment bridges (IABs) bearings and expansion joints are eliminated, and they are usually supported on steel H-piles oriented for their weak axis of bending to accommodate the bridge displacements. Owing to a large number of inbuilt indeterminacies associated with the rigid connection between abutment and pile and also due to the inclusion of soil-pile interaction, the behaviour of IABs becomes complex. Designers often use Winkler springs to model the soil-pile interaction, which necessitates the computation of the effective length of the pile, defined as the distance from pile-abutment interface to the first point of inflection in the pile’s bending moment profile. The effective length of the pile plays a significant role in accommodating the lateral-induced displacement demand, and is governed by pile stiffness, soil properties, pile length, pile orientation, the magnitude of lateral loads caused by temperature variation. This study aims to assess the impact of temperature gradient on the effective length of A36 grade steel H-pile sections under a slab-type integral abutment bridge. In this study three different H-pile sections are considered, and a temperature gradient ranging from 5 to 20 °C is considered. The study is performed by idealising the soil as a set of nonlinear springs based on the p-y curve proposed by the American Petroleum Institute.