带横杆多纵梁式矩形渡槽结构内力分析

Analysis of internal force for rectangular aqueduct of multi-longitudinal beams with cross rod

结合交口灌区总干渠跨相排干沟渡槽设计实例,考虑槽身横向和纵向结构变形协调,横向结构底部弹性支承在各纵梁上,应用实用空间法对带横杆多纵梁式矩形渡槽槽身结构进行内力计算,分析了横杆及主梁刚度对结构内力影响。结果表明:增加横杆使横梁跨中弯矩减少,但使侧肋弯矩增大,横杆使横向结构内力分布更加均匀,常常被称作拉杆的横杆,实际上受到压应力作用;随着纵梁刚度增大,渡槽竖向变形减小,横向结构所受弯矩减小,纵梁的荷载分布不均匀现象减小。所得结论可为同类渡槽结构设计提供参考。

Combined the design case of using aqueduct to bridge main canal over Xiangpaigan ditch in Jiaokou district, considering the force displacement coordination of aqueduct body in two orientation, the beam bottom is elastically supported by every longitudinal beam in lateral calculation, the article applied practical space method to calculate the internal force of rectangular aqueduct of multi-longitudinal beams with cross rod, and then analyzed the influences of cross rod and primary beam stiffness on structural internal force. The result reveals that adding cross rod can decrease bottom stringers＇ bending moment but increase side rib＇bending moment. Cross rods make the internal force of horizontal structure more uniform. The cross rod which is often called tie rod is actually subjected to compressing stress;with the increase of stiffness of vertical beams, the vertical deformation of aqueduct decreases, the bending moment of horizontal structure decreases; the uneven distribution of longitudinal beam ＇s force decreases. The outcome can provide refer- ence for the structure design of similar aqueduct.