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对钢筋砼构件最小配筋率的确定,目前国际上尚无公认的控制原则。本文从建筑结构设计时,应考虑承载能力极限状态和正常使用极限状态的基本原理出发,提出了钢筋砼构件最小配筋率应按“强度准则”和“裂缝诳度准则”确定的双控原则,并应用于受弯构件。同时经计算分析得到了受弯构件按“裂缝宽度准则”确定最小配筋率的控制表达式μ_(min)=kd(%),最小配筋率系数k为仅与钢号有关而与砼强度等级无关的常数,公式简明,便于应用。
For the determination of the minimum reinforcement ratio of reinforced concrete members, there is no internationally accepted control principle. In this paper, starting from the design of the building structure, the basic principle of the limit state of the carrying capacity and the limit state of normal use should be considered. It is proposed that the minimum reinforcement ratio of the reinforced concrete component should be determined according to the “strength criterion” and the “crack criterion”. The double control principle applies to bending members. At the same time, the control expression for determining the minimum reinforcement ratio according to the “fissure width criterion” of the flexural member is obtained by calculation and analysis μ_(min)=kd(%). The minimum reinforcement ratio coefficient k is only related to the steel number and The constant of the strength grade is not relevant, the formula is concise and easy to apply.