【摘要】 为澄清弹性中心法计算坝后背管工作应力的几个问题,计算了2个工程或模型实例并分别与相应的模型试验及有限元分析结果作了比较分析.考虑到环向管壁为高脚变截面深拱,故在采用弹性中心法时除考虑拉伸与弯曲变形以外,还考虑了剪切变形,也考虑了变截面与混凝土开裂的影响.分析表明,有限元法计算结果与模型试验结果比较接近,而弹性中心法计算结果则与它们相差较大,其理论原因是,弹性中心法不适用于厚壁管.更多还原

【Abstract】 To clear up the problem of elastic center method for calculating the authors working stress of penstocks laid on downstream surface of dam,the authors think over the shell of pipe to be a deep arch with high feet and variable section and adopt the elastic center method and think over the extensional deformation,bending deformation,shearing deformation as well as the influence of varied section and concrete cracks.Taking two engineering or model for examples,the comparison between the results of the model test and finite element method is made.It is shown that the results of the model test and finite element method are close to each other while the calculating result of elastic center method is obviously different;and that the reason lies in elastic center method being not suitable for the thick shell of pipe.更多还原