钢衬钢筋混凝土压力管道外包混凝土的裂缝控制研究

基于钢衬钢筋混凝土压力管道在设计荷载下外包混凝土将带裂缝工作的基本承载特性，以缓解开裂与限裂间的矛盾为指导思想，将减小坝后背管外包混凝土裂缝宽度和提高开裂管道的耐久性作为研究目的，结合模型试验和有限元法，研究了一些裂缝控制措施的应用效果，以及有效的计算内水压力下钢衬外包混凝土裂缝宽度的公式。结果表明：总用钢量相同时，减薄钢衬，加大钢筋用量，减小裂缝宽度效果明显；减薄钢衬外包混凝土厚度，也可减小裂缝宽度；性能可靠的防水涂料具备黏接性强和变形能力高的基本性质，可进一步研究其对提高管道耐久性的长期作用；采用П-780-83规范中的裂缝宽度公式，计算结果与模型试验结果较为符合。

Study on crack control of concrete wall of steel lined reinforced concrete penstocks

The concrete wall would crack under design load, which is the fact and one of working principles in steel lined reinforced concrete penstocks. In order to release the contradiction between cracking and limiting crack width, model tests and FEM are adopted to study on some measures of crack control, and calculation method of crack width. The results show that cracking width would decrease when using more bars and thinner lining, that cracking width would decrease slowly when reducing the thickness of concrete wall, that waterproof painting has the better properties of cementation and deformation, and can be studied on improve durability of materials by long-term tests, and that the result using the calculation method in code П-780-83 to calculate crack width, is coincident with the result of model test.