一、关于TJ_(10)—74规范中裂缝开展宽度的计算公式钢筋混凝土受弯构件在无裂缝出现之前,外荷载系由混凝土和钢筋共同承受,由于混凝土存在着抗拉性能很差的弱点,因此,混凝土在受拉区域本未考虑受力,当构件受荷至混凝土出现裂缝后,原来由钢筋和混凝土共同承受的拉力将由钢筋自己承当。由于混凝土材料的不匀质性,造成构件 First, on the TJ_ (10) -74 code to develop the width of the crack formula Reinforced concrete flexural members in the absence of cracks before the outer load by the concrete and steel to bear together, due to the existence of concrete tensile weaknesses weaknesses, Therefore, the concrete in the tension zone did not consider the force, when the components from the load to the concrete cracks, the original by the steel and concrete to bear the tensile force by the steel itself. Due to the non-homogeneity of the concrete material, the resulting components