关键词: 桥梁工程, 波形钢腹板, 箱梁, 剪力滞, 变分, 模型试验, 有限元

Abstract: In order to study the shear lag effect of box girder with corrugated steel web plate, the longitudinal displacement warping function of box girder was established, which considered the shear deformation of corrugated steel web plate, longitudinal and inplane shear deformation of the top and the bottom flange. Based on the energy variational principle, an analytical solution was derived for the shear lag analysis of the box girder with corrugated steel webs. Results of model test, finite element analysis and variational solution method were compared with each other. Study shows that: the calculation results of the shear lag effect of box girder with corrugated steel webs are in a good agreement with those of the model test and finite element analysis; the effect area of shear lag only occurs at both sides near the loading position in a very small range; the closer the loading position near the bearing position, the more obvious the shear lag effect. The ratio of width to height has no effect on shear lag. The shear lag coefficient is linearly related with the ratio of width to span. The shear lag coefficient of box girder increases with flange width.

Key words: bridge engineering, corrugated steel webs, box girder, shear lag, variation, model test, the finite element