A comparison of computational methods to predict the progressive collapse behaviour of a damaged box girder

The progressive collapse of a box beam under longitudinal bending can be predicted using various computational approaches, including finite element methodologies and the simplified progressive collapse method. These methodologies are employed to complete a series of analyses on three small box girders. The models are first analysed in the intact condition and then several damage scenarios are investigated. The results from the different computational approaches are compared to determine their relative performance. The study demonstrates the significance of residual stresses that are created during the damage simulation and are represented using differing assumptions in each of the compared methodologies.

► Pure bending of a damaged box girder is predicted by finite element analysis. ► Nonlinear methods are used to simulate rupture damage then longitudinal bending. ► Further validation is undertaken with a simplified progressive collapse method. ► Results show that stresses created during onset of damage affect bending behaviour. ► This phenomenon must be taken into account when predicting damage ultimate strength.