砂石垫层上混凝土管道管底弯矩系数的测定

THE DETERMINATION OF BENDING MOMENT COEFFICIENT AT THE BOTTOM OF CONCRETE PIPE ON SAND-GRAVEL CUSHION

本文采用光弹性方法对置于不同包角的砂石垫层上的混凝土管道内边界的应力分布进行了测定，并由推导出的利用管道底部内边界应力值确定管道弯矩系数的近似公式，对管道底部截面的弯矩系数进行了计算，为混凝土管道的铺设和施工提供了重要的设计参考依据。

In this paper, the inside border stress distribution of the pipeline set on the sandgravel cushion with different wrap angles is determined by using photoelastic method. And an approximate formula which can determine pipe's bending moment coefficient by using the inside border stress value at the pipe's bottom is derived and the bending moment coefficient of the bottom section of the pipe is calculated with it. All these provide an important reference basis on design for laying concrete pipelines.