AVOIDING FAILURE PROPAGATION IN STEEL TRUSS BRIDGES: A CASE STUDY

This study aimed to experimentally and computationally analyse the robustness of riveted steel bridges based on truss-type structures and to define practical recommendations for early detection of local failures before they cause progressive structural collapse. This paper describes a unique case of a 21m full-scale bridge span tested under laboratory conditions with an extensive monitoring system to evaluate structural behaviour and robustness as damage or failure progressed in its elements. A computational analysis was also included to examine other possible causes not included in the experiment. The results proved the structural redundancy of this type of truss structure based on different Alternative Load Paths (ALPs) and gave rise to a series of practical structural health recommendations to identify early failures and avoid progressive or sudden bridge collapse. The study carried out and the recommendations it produced are now being applied in three similar bridge case studies.