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新觇范(GBJ 10—89)仅提供了按M≥M_cr控制条件验算ρ_pmin的方法,该法只能用于复核计算,且计算较为繁复。本文按此控制条件导得的ρ_pmin迭代计算公式的基础上,对影响ρ_Pmin计算的诸因素作了全面的计算分析后,提出了ρ_pmin的简捷计算方法。此法不仅可方便地用于工程设计,并且从中可直接判断出诸影响参数与ρ_pmin间的定量关系。 根据新规范的抗裂验算准则,对于低配筋率的构件设计,将同时受到ρ_pmin要求和抗裂度要求的双重控制。本文同时提供了双控的简捷计算方法,在满足最小配筋率要求的条件下,避免进行繁复的抗裂验算。
The new standard (GBJ 10-89) only provides a method for checking ρ_pmin according to the M ≥ M_cr control condition. This method can only be used for review calculations, and the calculation is more complicated. In this paper, based on the ρ_pmin iterative calculation formula derived from this control condition, a comprehensive calculation and analysis of the factors affecting ρ_Pmin calculations are made, and a simple calculation method of ρ_pmin is proposed. This method is not only convenient for engineering design, but also directly determines the quantitative relationship between the various parameters and ρ_pmin. According to the new standard’s anti-crack check calculation criteria, the design of components with low reinforcement ratio will be subject to both the ρ_pmin requirement and the anti-crack requirement. At the same time, this paper provides a simple calculation method for double control, which can avoid complicated crack resistance checking under the condition of satisfying the minimum reinforcement ratio requirement.