加劲肋设置对斜拉桥混凝土双边箱主梁的剪力滞影响

以五河口混凝土斜拉桥为例,采用空间有限元建模的方法对混凝土宽体双边箱主梁设置加劲肋前后的剪力滞情况进行了分析,结果表明：设置纵向加劲肋后,双边箱桥面板剪力滞系数变化不大,双边箱间桥面板的剪力滞系数变化明显;桥面板设置2根纵向加劲肋后,主梁双边箱之间的桥面板剪力滞效应有所降低,在桥面板上设置3根纵向加劲肋效果不如设置2根纵向加劲肋,有可能使桥面板截面出现局部拉应力.

Shear Lag of the Contrete Double Side Box Girder of Cable-stayed Bridge with Setting Lengthways Stiffeners

Taking Wuhekou concrete cable stayed bridge for example, the paper analyzes shear lag of the girder with stiffeners and no stiffeners by 3D limited units. Conclusions are as follows： the shear lag coefficient of double side box has almost no change by setting lengthways stiffened bars, variation of shear lag coefficient of the bridge deck slab is clear between double side box and double side box; shear lag coefficient of bridge deck slab between double side box and double side box is reduced by setting two lengthways stiffened bars. Setting two stiffeners is better than setting three stiffeners in the bridge deck slab, while the bridge deck slab setting three stiffeners may have tensile stress in the local.