变截面波形钢腹板组合箱梁剪应力及剪力传递效率分析

Analysis of Shear Behavior and Transfer Efficiency of Variable Cross-section Composite Box Girder with Corrugated Steel Webs

依据变截面波形钢腹板组合箱梁特点,考虑梁高、底板厚度的变化,从弹性微元段的受力平衡出发,推导钢腹板剪应力计算公式,结果表明,箱梁剪力由混凝土顶、底板和波形钢腹板共同承担,变截面波形钢腹板梁中的剪应力除了由截面剪力引起外,还包括有截面弯矩和轴力引起的附加剪应力;通过与等截面计算公式和有限元数值计算结果对比验证,表明笔者给出的计算公式具有较高计算精度;最后在此基础上考虑3种荷载工况,给出一变截面波形钢腹板箱梁的剪力传递效率.

Based on characteristics of the variable cross-section box girder with corrugated steel webs, consid- ering girderheight and bottom plate from the force equilibrium of thickness, the elastic element, the web＇ s shear stress formula was derived. It was shown got that shear stress of variable cross-section composite box girder with corrugated steel webs was sheared by top and bottom concrete plate and corrugated steel webs. It was concluded that the variable cross-section composite box girder＇ s shear was caused by the section＇s shear force, in addition, also including additional shear stress which was produced by bending moment and axial force. Through comparing of the formula solutions section and variable＇ s formula and FEA results of constant section, it is indicated that the shear stress calculation formula has higher calculation precision. Finally, based on testing the formula, taking into account three load cases, variable cross-section box girder with corrugated steel webs shear force transfer efficiency was given.