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在钢筋代换中,用径差上下相等的两种规格钢筋代换原设计的一种钢筋,不需计算。例如用1φ16和1φ20代2φ18,或用1φ18和1φ22代2φ20。其原理如下。钢筋等强代换公式:N_2+N_3≥N_1下标1代表原设计钢筋,下标2、3代表拟代换钢筋。即,n_2 d_2~2fy_2+n_3 d_3~2fy_3≥n_1 d_1~2fy_1其中fy_1=fy_2=fy_3,上式简式化为n_2d_2~2+n_3d_3~2≥n_2d_1~2只要证明上式成立,即代换后强度大于或等于原设计值,代换就不需计算。假设原设计的钢筋直径与代换后的两
Replacement in the bar, with two different sizes of steel up and down the same replacement of the original design of a reinforcement, without calculation. For example, 2φ18 for 1φ16 and 1φ20, or 2φ20 for 1φ18 and 1φ22. The principle is as follows. Reinforcing steel and other strong substitution formula: N_2 + N_3≥N_1 subscript 1 represents the original design of steel, subscript 2,3 represents the proposed replacement of steel. That is, n_2 d_2 ~ 2fy_2 + n_3 d_3 ~ 2fy_3≥n_1 d_1 ~ 2fy_1 where fy_1 = fy_2 = fy_3, the above formula is simplified as n_2d_2 ~ 2 + n_3d_3 ~ 2≥n_2d_1 ~ 2 As long as the above formula is established, Intensity greater than or equal to the original design value, substitution need not be calculated. Assume that the original design of the steel diameter and substitution of two