腹板几何参数变化对波纹钢腹板箱梁桥的力学影响

Mechanics geometric parameters on the impact of the web of corrugated steel box girder bridge

以邢衡高速公路邢台段上一座波纹钢腹板组合箱梁桥(50 m+80 m+50 m)为工程实例,通过有限元软件Midas建立波纹钢腹板组合箱梁桥空间模型。分析了钢腹板几何参数变化下的箱梁基本力学特性,结果显示:箱梁挠度受腹板几何参数变化的影响很小;减小腹板直线段长度b对箱梁有利;波纹钢腹板相对于平板钢腹板可以明显提高箱梁抗扭刚度,弯折角越大,箱梁抗扭刚度越大;增加腹板厚度t可以改善箱梁受力性能。

In this paper,the ripple web composite box girder bridge（50m ＋ 80 m ＋ 50m）of Xingtai Xing Heng highway segment was regarded as an engineering example,the model of ripple web composite Box Girder Bridge was established by the finite element software Midas. The basic mechanical properties of box girder of different geometrical parameters on rigid web were analyzed,the results show that the deflection of box girder is very small due to the variation of geometric parameters of the web. Besides,it is favorable to reduce the length of straight line segment. The results also show that the torsional stiffness of the box girder can be increased obviously with the corrugated web relative to the flat web plate,and the greater the bend angle,the greater the torsional rigidity of box girder. Additionally,the increasing of the thickness of the web can improve the performance of box girder.