折腹式组合梁桥考虑剪切变形的挠度计算

Deflection Calculation of Composite Girder Bridge with Corrugated Steel Web with Consideration of Shear Deformation

摘要:

提出考虑剪切变形的弹性弯曲理论分析折腹式组合梁桥.通过假定位移场，建立内力平衡方程、变形协调条件以及物理方程，依据边界条件和荷载工况求出解析解.以折腹式I型和箱型梁为算例，将该理论结果和有限元计算及试验结果进行比较，验证其妥当性.基于该理论得出跨中挠度简化计算式，给出考虑剪切变形影响与否的高跨比界限.

Abstract:

The paper presents the elastic bending theory by taking shear deformation for composite bridge with corrugated steel web.Based on displacement field assumption,internal force equilibrium equations,the deformation compatibility condition,the relationship of deformation and internal force,and analytical solutions are obtained according to boundary and load condition.Simply supported Iand boxgirder bridge with corrugated steel web are analyzed with elastic bending theory considering shear deformation, their predicted results are found in good agreement with those of the finite element analysis and model test.A limit value of depthspan ratio is suggested,whether the influence of shear deformation being considered or not.A simplified formula of deflection in middle span is presented to guide deflection design.