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一、验算要求规范第3.3.3条和第5.1.1条规定结构构件设计裂缝控制等级分为三级,其中一、二级为不允许出现裂缝:一级:严格要求不出现裂缝。所谓严格要求不出现裂缝,即在设计基准期内严格不出现裂缝。要做到这一点,仅要求荷载标准值产生的拉应力小于砼强度标准值还不够,因为在使用阶段,荷载实际值有可能超过标准值,砼抗拉强度实际值有可能低于抗拉强度标准值,因此还必须提出更严格的要求,
First, the calculation requirements of the requirements of Article 3.3.3 and 5.1.1 of the provisions of the structural components of the design of the crack control rating is divided into three levels, one or two is not allowed to cracks: First: strict requirements do not appear cracks. The so-called strict requirements do not appear cracks, that is, no cracks are strictly observed during the design reference period. To do this, it is not enough to only require the tensile stress generated by the load standard value to be less than the yam strength standard, because in the use phase, the actual load value may exceed the standard value, and the actual tensile strength may be lower than the tensile strength. The standard value, so must also put forward more stringent requirements,