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1前言在工程设计中,对于钢筋砼受弯构件纵向受力钢筋面积As,大都是在求出外弯矩之后,根据断面大小及砼强度等级直接查表得出,或者根据ζ—γs—α_s表,求出α_s查出γs,然后计算出As。这两种方法都避免了繁冗计算,在使用计算图表情况下,确实给工程设计人员带来了很大方便,节约了时间,提高了工作效率。但必须有计算图表,一旦离开设计手册,只有解方程求As,尤其是对于工业建筑,其构件断面大小往往与计算图表所给尺寸不相符合。这
1 Foreword In the engineering design, for reinforced concrete flexural members longitudinally reinforced steel area As, mostly obtained after the outer bending moment, according to the cross-section size and concrete strength level directly look-up table obtained, or according to ζ-γs-α_s Table, find α_s detected γs, and then calculate As. Both of these methods eliminate the need for complicated calculations and, in the case of using chart calculations, do bring great convenience to engineering designers, save time and improve work efficiency. However, there must be a calculation chart. Once the design manual is left, only the equation is solved for As, especially for industrial buildings, the sectional size of the components often does not correspond to the size given in the calculation chart. This