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4 裂缝宽度计算钢筋混凝土受弯构件除了可能由于强度破坏而达到承载能力极限状态以外,还有可能由于变形过大或裂缝宽度超过了允许的限值,使结构不能正常使用,而到达正常使用极限状态。因此,对于钢筋混凝土受弯构件除了要进行强度计算之外,还要根据使用条件进行变形和裂缝宽度计算。 4.1 裂缝的特性分析 4.1.1 裂缝的成因钢筋混凝土受弯构件的裂缝,就其产生的原因,大致可分为两类;一类是由于荷载(如
4 Calculation of crack width In addition to the ultimate strength of the load carrying capacity of reinforced concrete flexural members may be due to the destruction of strength, it is also possible because the deformation is too large or the width of the crack exceeds the allowable limit, so that the structure can not be used normally and reached the normal use limit status. Therefore, in addition to the strength of reinforced concrete flexural members in addition to calculations, but also under the conditions of use deformation and crack width calculation. 4.1 Analysis of the characteristics of cracks 4.1.1 Causes of cracks The cracks in flexural members of reinforced concrete can be roughly divided into two categories for reasons of their occurrence;