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二、用两种钢筋代换一种钢筋以脚标“1”代表原设计钢筋,脚标“2”、“3”代表准备代换的两种钢筋,则根据以上等强代换计算原则,可以得到下式:n_2d_2~2R_(g2)+n_3d_3~2R_(g3)≥n_1d_1~2R_(g1)(2)为了节约用钢量,或由于某种钢筋供应不足,用两种钢筋代换一种钢筋的情况是经常会遇到的。不过,应用(2)式时,出现了n_2和n_3两个未知数,这就得先假定n_2值,再去求n_3值。
Second, use two kinds of steel bars to replace a kind of steel bar with the subscript “1” to represent the original design steel bar, the subscript “2”, “3” represents two kinds of steel bars that are prepared for substitution, according to the above, etc. The principle of strong substitution calculation can get the following formula: n_2d_2~2R_(g2)+n_3d_3~2R_(g3)≥n_1d_1~2R_(g1)(2) In order to save the amount of steel used, or because of a shortage of steel supply, use two The situation where one kind of steel bar is substituted for one type of steel bar is often encountered. However, when applying formula (2), two unknowns, n_2 and n_3, appear. This requires first assuming the value of n_2 and then finding the value of n_3.