不需验算裂缝宽度的钢筋混凝土构件配筋直径选用图表研究

在《混凝土结构设计规范》(GB50010-2002)给出的计算公式的基础上分析了裂缝宽度限值与钢筋直径、保护层厚度混凝土强度等的关系,编制程序计算并精确绘制了不同工况下的图表,然后采用最佳最小二乘法对图表进行拟合归并,归纳出查用简便,且有相当精确度的图表.

Research on the Figures of Diameter of Steel Bar Without Checking Crack Width of Reinforced Concrete Members

Controlling and checking the reinforced concrete member on the crack width is very important with the using of the high strength bar. The figure show the largest diameter of steel bars without checking crack width of reinforced concrete members in Appendix 7 of "Concrete Structure Design Code" (GBJ10-89), but the different expression to calculate the largest crack width is given in the new code (GB50010-2002). The designers always use this figure, so the figures of varying conditions is given in the paper, then least squares fit is used to merge the figures. Finally the exact and simple figures are given to designers.