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在施工中,由于钢筋的规格和等级不能符合原设计要求,而需进行代换的情况是不可避免的。1983年第2期《工业建筑》刊载曾钦林同志推导的公式,即该文中公式(5),(?)并给出了现成的各种系数值,对现场应用尚属方便。但曾文公式(5) 中,没有考虑现行《钢筋混凝土结构设计规范》(TJ10-74) (试行) (下称规范) 中公式(17) 对截面受压区高度x的限制,即x≤0.55h。(当采用冷拔低碳钢丝时,x≤0.45h_0)。因此,当用低级别钢筋代换原设计的高级别钢筋而用曾文
In the construction, because the specifications and grades of steel bars cannot meet the original design requirements, it is unavoidable to replace them. In the second edition of “Industrial Architecture” published in 1983, the formula derived by Comrade Zeng Qinlin, that is, formula (5), (?) in the article, and the various values of the existing coefficients are given, which is convenient for on-site application. However, in the formula (5) of Zengwen, the limitation of the height x of the compression zone of the section is not taken into account in the existing “Code for Design of Reinforced Concrete Structures” (TJ10-74) (Trial) (hereinafter referred to as the “norm”), ie x≤ 0.55h. (When cold drawn low carbon steel wire, x ≤ 0.45h_0). Therefore, when using low-grade steel to replace the original design of high-grade steel and use Zengwen