通过对钢筋混凝土环板在周边固支情况下的内力、挠度分析，建立计算表达式，进一步探讨 裂缝展开宽度的计算。文中附有计算实例及实验对比分析并提出上述公式的适用条件。所提出的 计算方法尚可用于检验目前各种半解析半经验公式，并证实了在极限状态下挠度方程不是线性关 系的简单函数。 Through the analysis of the internal forces and deflections of the reinforced concrete ring plate at the peripheral fixed support, a calculation formula was established to further discuss the calculation of the crack expansion width. The calculation example and comparative analysis of the experiment are attached and the applicable conditions of the above formula are proposed. The proposed calculation method can also be used to test various semi-analytic semi-empirical formulae at the present time, and confirms that the deflection equation is not a simple function of the linear relationship at the limit state.