Study analysis on failure mechanism of small span pedestrian cold formed truss bridge

Truss bridges are the structure whose load bearing superstructure are made up of truss shape. The purpose of this study is to investigate the failure mechanism of the cold formed steel truss bridge. Two truss bridge specimens called B1 and B2 were made with total length span of 4.8 m, width of 0.85 m, and height of 0.75 m for pedestrian bridge. Specimen B1 was made with connection using screw only and specimen B2 was made with connection using combination of screw and adhesive. The experimental programs have been conducted for Specimen B1 and B2 using bending test machine with two-point loads. From the results of analytical solution and experimental program, they showed that the maximum load of specimen B1 is 3420 kg and specimen B2 is 5700 kg. The failure mechanism of specimen B1 due to connection failure, the gusset plate experienced local buckling and some screws were broken and the failure mechanism of specimen B2 due to member failure, the compression member experienced local buckling and all connections were still in good condition. It can be concluded that specimen B2 is better performance than specimen B1 due to the contribution of combination of screw and adhesive on connection and adding the thickness of gusset plate.