大保护层厚度高强钢筋混凝土受弯构件裂缝宽度比较分析

介绍了各国规范裂缝宽度的计算理论和计算公式的考虑因素，给出了欧美规范的裂缝计算公式。然后对不同保护层厚度、不同钢筋强度等级的受弯构件裂缝宽度进行了比较分析，结果表明：1）按我国混凝土规范计算的裂缝宽度值大大高于欧美规范计算值，但其中原因并非我国规范对保护层厚度影响因素取不合理；2）在选择钢筋时，除了考虑钢筋强度外，钢筋的根数也是影响裂缝宽度的重要因素之一。最后，对我国混凝土规范的裂缝宽度计算方法提出了几点建议。

Comparative Analysis of Crack Width for High Strength RC Flexural Members with Large Cover

The computational theories and influential factors of crack width in several countries’ concrete codes are introduced,and some detailed expressions are given.Then,the crack widths of flexural concrete members are calculated with different codes’ formulae,where two variables,concrete cover and steel grade,are taken into account.The analytical results show: 1) the crack width calculated with Chinese concrete code is much higher than that of occident codes,which isn’t caused by the influence of concrete cover;and 2) to steel bars,except for steel grade,the number of steel bars is another factor affecting crack width.At last,several advices to crack width calculation for our concrete code are proposed.