Validated analysis and strengthening of a 19th century railway bridge

A systematic study of a historic railway steel truss bridge, still in use, is presented. The study includes static and dynamic field measurements as well as laboratory tests. The tests have been conducted to develop a validated analytical model, which in turn is employed to assess the capacity of the bridge to carry heavier train loads as well as seismic and wind loads, as specified by current codes. Members that require strengthening or replacement are identified, strengthening schemes are proposed and the remaining fatigue life of the bridge in its present condition and after the suggested strengthening is predicted.