The shear bearing capacity of shear keys in the precast segmental concrete girders with all-glued joints shows sign of reduction under the action of freeze-thaw cycles.A finite element model to calculate the shear bearing capacity of shear keys was established,to conduct parametric analysis of the number of freeze-thaw cycles,the repeated loading after freeze-thaw action,normal stress level,as well as number and dimension of teeth in a shear key,based on the findings of the model tests with both monotonic and cyclic loading and considering the stress-strain curves of the freeze-thaw materials.The results demonstrate that the shear bearing capacities of the shear keys after monotonic and cyclic loadings are in quadratic relations with the number of freeze-thaw cycles.Freeze-thaw cycles notably undermine the shear bearing capacity of the shear keys,when applied with cyclic loading after freeze-thaw action,the shear bearing capacity of the shear keys further drops.Under monotonic loading,the shear bearing capacity of shear keys are in linear relation with normal stress,in 3 power parabolic relation with the number of teeth,when the teeth of a shear key exceed 4,increasing the teeth number would not lead to distinct increase of the shear bearing capacity,and the shear bearing capacity is in linear relation with the teeth dimension.
precast segmental girder with all-glued jointshear keyshear bearing capacityfreeze-thaw cycleparametric analysisconcrete damage plastic modelfinite element method
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