In the next 20 years, more than half of the bridges in Japan would be in service for more than 50 years.These include truss bridges those are generally considered to be non-redundant and fracture critical. Withageing, these bridges are facing an increasing risk of bridge collapse under extreme conditions. Therefore,it is essential to evaluate alternate load paths on existing bridge structures to avoid bridge collapse orreplacement. In this paper, after-fracture redundancy of truss bridges is investigated through a case studyfor a five-span continuous truss bridge. Field tests were performed, and the displacements on key sectionswere measured in the test. According to the experimental observations and test results, a numerical modelcapable of simulating the present truss bridge was built and was used to investigate the after-fractureredundancy of the target bridge. Fracture of truss members in typical locations was considered in thenumerical analyses, and the ‘R’ values of both intact and damaged trusses were compared. On the basis ofthe numerical results, a critical member in this bridge was also determined. |