水工钢闸门轨道纵向应力实测值与我国现行规范计算值差异较大。采用理论推导、数值计算、有限元求解的方法对这一问题进行研究。研究表明水工钢闸门轨道特殊的受力和边界条件，是轨道横截面正应力分布异于初等梁理论的原因。轨道与混凝土基础的水平摩阻力使轨道底面弯曲应力有较大幅度下降，轮轨接触局部荷载的作用与弯矩的叠加效应使轨道顶部横截面的正应力有大幅度提高。提出的计算公式可供计算轨道底面和顶面的最大弯曲应力。其分析很好地解释了三峡工程高压闸门定轮支承结构试验中轨道弯曲应力测试的现象。

The measured values of the longitudinal stress in the full size hydraulic track test model are different from the values calculated by the Chinese applicable codes. This problem is studied by use of the theoretical derivation, numerical calculation and FEM. Studies indicate that the particular boundary conditions and forces exerted on the hydraulic track are the main reason of the normal stress of cross-section in track being different from the general beam theory. The bending stress of bottom of the track appears a biggest-range descent due to horizontal resistance between track and concrete foundation. And the normal stress of cross-section in the top of the track occurs a wide-range ascent due to the superimposed effect of local load of wheel-track contact and bending moment. The formulas proposed in this article can be used for structures design. This analysis can well explain the phenomenon occurring in the test of bending stress of track which is the supporting structure of fixed-roller wheel high-pressure gate of TGP.