长悬臂混凝土箱梁翼缘板受力分析

On the Stress Analysis of the Flange Plate of a Long-Cantilevered Concrete Box Girder

长悬臂混凝土箱梁是一种增加翼缘板宽度的新型截面箱梁,目前我国规范所规定的计算箱梁行车道翼缘板有效分布宽度概念对于长悬臂翼缘板已不再适用。以有限元分析为基础,应用大型有限元ANSYS计算软件,在集中荷载作用下,考虑横向预应力的影响,对长悬臂箱梁翼缘板进行内力分析。结果表明:箱梁端部翼缘板根部负弯矩与箱梁跨中翼缘板根部负弯矩具有明显差异,且横向预应力对翼缘板内弯矩的分布有重要影响。结合数据分析,研究翼缘板内弯矩的分布规律,为其配筋设计提出建议。

The long-cantilevered concrete box girder is a girder with a new type of cross section.Nowadays,the concept of the effective distribution width of the calculation method for the calculation of the flange plate of a running lane provided by the technical norm is no longer applicable to the calculation of the long-cantilevered flange plate,in which case the large-type finite element calculation software of the ANSYS is applied,upon the basis of the finite element analyses,to the stress analysis of the long-cantilevered flange plate under the concentrated loads,with the influence of the transverse pre-stressing taken into account.The calculated result shows that the negative moment of the root of the flange plate at the ends of the box girder is obviously different from that of the flange plate at the middle of the box girder,and the transverse pre-stressing has a significant impact on the distribution of the bending moment in the flange plate.Combined with data analyses,the distribution law of the bending moment in the flange plate may thus be studied,the result of which can provide useful suggestions for the design of its reinforcement.