水工钢筋混凝土矩形截面(单筋),圆形截面及环形截面受弯构件强度计算,一般采用基本公式试算法求解或查表法计算。本文则在文献[1]、[2]、[3]查表法基础上,推导出在常用条件下,形式非常简单,便于记忆,又有一定精度的快速估算公式,可供从事初步设计、施工及运行管理中作强度复核以及快速校核、审查设计成果时使用。(一)快速估算公式推求由文献[1][2][3]可知,对单筋矩形截面(见图1),可由 A。=KM/bh_0~2R_w 查表得ξ,然后计算μ=ξR_w/R_g 和 A_g=μbh。;对圆形截面(见图2)可由 A。=KM/ArR_w及 r_g/r 查表得ξ,然后计算μ=ξRw/R_g 和 Hydraulic concrete reinforced concrete rectangular section (single rib), circular section and circular section flexural member strength calculation, the general formula test algorithm to solve or look-up table calculation. Based on the table look-up methods of literature [1], [2] and [3], this paper deduces a fast estimation formula which is very simple, easy to remember and has a certain accuracy under common conditions, which can be used for preliminary design, Construction and operation management for strength review and quick check, review the design results used. (A) The rapid estimation formula deduced from the literature [1] [2] [3] shows that the single rib rectangular cross section (see Figure 1), by A. = KM / bh_0 ~ 2R_w look-up table ξ, then calculate μ = ξR_w / R_g and A_g = μbh. ; On the circular cross-section (see Figure 2) by A. = KM / ArR_w and r_g / r look-up table ξ, and then calculate μ = ξ Rw / R_g and