在水工建筑物中,广泛使用混凝土、少筋混凝土和钢筋混凝土构件。这些构件的普遍特点是截面尺寸大,配筋率低,跨高比较小。对于这种大截面的构件,在荷载作用下,其工作情况如何,破坏征状及安全度如何,一直为有关人员所关注。尤其水工建筑物长期处于水湿环境中,裂缝的产生,将直接危及混凝土和少筋混凝土构件的强度,影响钢筋混凝土构件的耐 In hydraulic structures, the use of concrete, less concrete and reinforced concrete members. The common features of these components are large cross-sectional dimensions, low reinforcement ratio, and low cross-height. For such a large section of the component, under load, how it works, the destruction of symptoms and safety, has been of concern to the personnel concerned. In particular, hydraulic structures are exposed to water environment for a long time, and the occurrence of cracks will directly endanger the strength of concrete and less-reinforced concrete members and affect the resistance of reinforced concrete members