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对最新修订的GB 50010—2010《混凝土结构设计规范》裂缝宽度验算公式进行变换,首先提出用一新的正截面承载力计算中的纵向受拉钢筋配筋率、钢筋应力和钢筋直径的关系曲线代替常用的按有效受拉混凝土截面面积计算的纵向受拉钢筋配筋率、钢筋应力和钢筋直径的关系曲线;接着给出了结构设计时参考图表和应该注意的内容;最后提出钢筋混凝土受弯构件不需作裂缝宽度验算的最大钢筋直径的统一调整公式。在设计配筋时,只需计算出钢筋应力查表或根据调整公式就可以判定所选钢筋是否满足规范对裂缝宽度限值的要求。
Based on the newly revised calculation formula of crack width of GB 50010-2010 “Code for Design of Concrete Structure”, a new curve of the ratio of longitudinal reinforcement ratio, reinforcement stress and reinforcement diameter in the calculation of bearing capacity of normal section Instead of the commonly used effective tensile concrete cross-sectional area calculated by longitudinal tensile ratio of steel reinforcement, steel stress and steel diameter curve; followed by the design of the reference chart and should pay attention to the content; Finally, the reinforced concrete bending The component does not need to make a unified adjustment formula of the maximum reinforcement diameter for checking the crack width. When designing the reinforcement, it is only necessary to calculate the reinforcement stress look-up table or adjust the formula to determine whether the selected reinforcement meets the requirements of the specification for the width of the crack.