混凝土工程施工中,有时可能发生混凝土强度达不到设计要求的强度等级而造成混凝土强度不足的情况。这种质量事故将给结构承载能力带来影响,而且对于不同的结构影响也不相同。一、轴心受拉构件混凝土的抗拉强度很低,受拉开裂时的极限应变很小,所以当混凝土构件所承受的拉力很小时就被拉裂了,而这时其中的钢筋拉应力很小,其强度尚未被充分利用。也就是说,混凝土开裂前,混凝土与钢筋共同工作负担拉力,而待钢筋混 Concrete construction, the concrete strength may sometimes occur less than the intensity of the design requirements of the level of strength caused by the lack of concrete situation. This kind of quality accident will have an impact on the structural carrying capacity, but also affect the different structures differently. First, the axial tension member tensile strength of concrete is very low, the tensile strain when the tensile strain is small, so when the tensile strength of concrete components is small when it was cracked, and then one of the steel tensile stress is very Small, its strength has not yet been fully utilized. In other words, concrete before cracking, concrete and steel work together to bear the tension, and to be reinforced