Numerical investigation of derailment loading on composite fibre transoms for implementation in the Sydney Harbour Bridge

This paper investigates the behaviour of composite fibre transoms subjected to derailment loading through a numerical analysis. The timber transoms currently installed on the Sydney Harbour Bridge railway track are soon to be replaced due to their low service lifespans and regular maintenance requirements. Whilst steel and concrete alternatives achieve elongated service lives, each possess unique limitations associated with installation and serviceability. In light of this, recent studies have focused on the development of composite fibre technology (CFT) transoms. Whilst previous studies have analysed CFT transom response to static and quasi-static loading conditions, limited research is available regarding the performance of composite fibre transoms, when subjected to derailment induced impact loading. In order to bridge this knowledge gap, numerical analysis have been utilised to investigate the internal stress distribution and detailed failure behaviour of Wagner’s CFT transoms, under impact loading.