Shear Stress Calculation of Steel Truss Webs In Variable Cross-Section of Concrete Composite Girder with Steel Truss Webs
Based on the elastic beam micro-element method,considering the shear contribution of concrete roof and floor to the composite girder,under the combined action of axial force,shear force and bending moment,the calculation formula of shear stress for the steel truss web—concrete composite girder with variable sections was deduced and verified with calculation examples and finite element.The research results showed that the calculation results of the analytical method and the finite element method are in good agreement,the influence of the variable section effect cannot be ignored in the shear stress calculation of the steel truss webs—concrete composite girder with variable sections.Under the action of concentrated load,the maximum difference between the shear ratio of the equivalent steel web of the constant-section beam and the variable-section beam is about 79.75%.From the end of the cantilever girder to its root,the shear stress of the steel truss webs decreases,and the shear ratio of the steel truss webs decreases from 81.48%to 10.90%.
variable cross-sectionsteel truss webscomposite girdershear stressshear ratio
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