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我国各部门的设计规范和规程中,对钢筋混凝土受弯构件使用阶段带裂缝工作的截面刚度Bd长期来均沿用三系数的计算公式。本文在钢筋轻骨料混凝土受弯构件三系数刚度计算公式的基础上,通过理论推导和200多根试件的分析提出了适用于各种不同截面形式的甚为简明的刚度简化计算公式。它不仅和三系数刚度计算公式具有同样的精度,而计算要简便得多,并能看出各影响参数与刚度Bd间的直接的定量关系,对迅速合理地进行结构截面设计具有较大的实际意义。本文所提出的刚度简化计算公式已被钢筋轻骨料混凝土结构设计规程(JGJ12-82)所采纳。
In the design specifications and procedures of various departments in China, the three-coefficient formula is used for the long-term cross-section rigidity Bd of the reinforced concrete bending members in the period of use. In this paper, on the basis of the calculation formula of the three-column rigidity of reinforced concrete lightweight aggregate concrete members, the theoretical derivation and the analysis of more than 200 test specimens are proposed to simplify the computational formulae of rigidity for various different cross-sectional forms. It not only has the same accuracy as the three-coefficient stiffness calculation formula, but also has a much simpler calculation, and can see the direct quantitative relationship between the various influencing parameters and the stiffness Bd, and has a large practical effect on the rapid and reasonable structural section design. significance. The stiffness calculation formula proposed in this paper has been adopted by JGJ12-82.