Abstract
In numerical models for evaluating the load carrying capacity of bridges, connections between slabs and main girders are generally modeled as rigid even for bridges designed as non-composite. This is because it is thought that slabs and main girders deform as composite beams due to slab anchors and steel-concrete bonding under the design load condition. Measurement results on real bridges supporting this idea have also been reported. However, in the case of evaluating redundancy of bridges after damage, it can not be expected to exist composite action between slabs and main girders, unlike in intact case under the design load condition. In this paper, focusing on the nonlinear behavior of slab anchors, we have conducted a series of nonlinear finite element analyses of a non-composite multi-girder steel bridge. As a result, it can be concluded that the bending stress of main girders depends considerably on the behavior of slab anchors and that slab anchors can be yielded under the load smaller than the design load.
