坝高与弧高比对高拱坝柔度系数上限值影响的探讨

Impact of Dam Height and Arc Length-Height Ratio on the Flexibility Coefficient of Arch Dam

基于薄拱坝坝体屈曲失稳理论,将浅拱非线性屈曲理论引入到拱坝的水平拱圈屈曲计算中,通过定量简化计算分析,得出了拱坝柔度系数上限值与坝高之间的非线性函数关系式;同时基于新版《水工设计手册》(以下简称《手册》)中国内外已建高拱坝参数,考虑坝高H、弧高比及河谷形状等对拱坝柔度系数的影响,给出了经验性的拱坝柔度系数上限值公式。通过对已建拱坝柔度系数计算比较分析,认为提出的拱坝柔度系数上限值公式具有一定参考价值。

On the basis of the theory of thin arch dam＇ s buckling instability, the nonlinear buckling of shallow arch is introduced into the calculation of horizontal arch ring＇ s buckling for arch dam. The nonlinear functional relation- ship between the maximum flexibility coefficient and the dam height is obtained by simplifying quantitative calcula- tion and analysis. Furthermore, according to the parameters of built arch dam at home and abroad in the latest ver- sion of Hydraulic Design Manual, the empirical formula of flexibility coefficient is given in consideration of the im- pact of dam height H, arc length-height ratio, and valley shape. Calculations for some built arch dams with this for- mula verified that this formula is valuable in the actual design.