連続多主桁橋の冗長性に及ぼす床版・主桁間の合成効果に関する数値的検討

Numerical consideration on effect of composite action between slab and girders on redundancy of a continuous multi-girder steel bridge

竹田　翼　(Tsubasa TAKEDA)　

For evaluating the load carrying capacity of bridges by the finite element analysis, connections between slabs and main girders are generally modeled as rigid even for bridges designed as non-composite. This modeling is supported by the measurement results that slabs and main girders deform as composite beams due to slab anchors and steel-concrete bonding under the design load condition. 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.This study evaluates the effect of modeling of connection between slabs and main girders on redundancy of a continuous multi-girder steel bridge through a series of nonlinear finite element analyses. As a result, we conclude that it is important to include the nonlinear behavior of slab anchors to the model of the connection for the redundancy analysis.

Key Words : continuous multi-girder steel bridge, redundancy, shear connectors, nonlinear finite element analysis

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