Two-Dimensional Performance of Integral Abutment Bridges using Finite Element Analysis

ABSTRACT: Integral Abutment Bridges are complex structures designed to encompass a continuously rigid assembly deprived of expansion and bearing joints. Under cyclic thermal loading, the structure operates as one unit through expanding and contracting mechanisms giving rise to passive and active earth pressures, respectively. To fully understand this compound response, a Two – Dimensional Finite Element model of the SR – 18 over Mississinewa Bridge was developed using PLAXIS. A hardening soil model was utilized to simulate the hysteretic nonlinear elasticity and stress dependent stiffness behavior of soils. This model aims to replicate the behavior of the structure under current conditions. Simulations were validated with field measured deformations thus providing an operational model capable of simulating the long-term performance of the bridge. This paper provides the preliminary results obtained following the FE analysis where they will be supported by further details that are to be discussed over the course of the conference.