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我国现行钢筋混凝土结构设计规范TJ10-74指出:“对使用上需要限制裂缝宽度的结构构件,应进行裂缝宽度验算”。同时,规范推荐了受弯和轴心受拉构件最大裂缝宽度的验算公式。但在工程设计中,当按强度计算所求得的配筋率较小而用规范公式验算满足不了裂缝宽度要求时,通常需要重新调整配筋率再行验算,直至满足最大裂缝宽度的允许值为止。这样验算,一般难于一次算成,往往需要反复试算几次,深感烦琐费时,影响设计速度。为简化计算,文献[1]和[2]列出了计算最大裂缝宽度的一系列计算图表,但这些计算
China’s current design specification for reinforced concrete structures TJ10-74 points out: “For cracks in the use of structural components that require limiting the width of cracks, crack widths should be checked.” At the same time, the code recommends the formula for checking the maximum crack width of bending and axial tension members. However, in the engineering design, when the reinforcement ratio calculated by the strength calculation is small and the crack width requirement cannot be satisfied by the verification of the standard formula, it is usually necessary to re-adjust the reinforcement ratio and check again until the maximum allowable crack width is satisfied. until. Such check-ups are generally difficult to calculate once, and often require trial and error calculations several times. This can be cumbersome and time-consuming, affecting the design speed. To simplify the calculations, a series of calculation charts for calculating the maximum crack width are listed in [1] and [2], but these calculations