一、问题的提出在水工和大型构筑物设计中,断面较大。强度设计容易满足,而限制裂缝开展宽度往往是控制因素。在工程实践中一般认为当抗裂安全系数0.7 ≤K_T<1.0时,裂缝开展宽度不会过大。但是,在实际计 First, the question raised Hydraulic and large structures in the design, the larger section. Strength design easy to meet, and to limit the width of cracks is often the control factor. In engineering practice, it is generally considered that when crack safety factor 0.7 ≤K_T <1.0, crack propagation width will not be too large. However, in practice