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通过对大型贮罐基础环墙侧压力的实测和调查分析,发现环墙的侧压力很小,目前采用的环拉力公式计算值偏大,也没有考虑温度和收缩的影响。我们认为影响环墙内力、出现环墙裂缝的原因虽然很复杂,但主要是温度和收缩变形,如配筋不适当,就会导致环墙出现竖向裂缝。为此,在实测调查的基础上,大胆地改革了环墙的结构,将现浇连续式改为预制装配式,从根本上解决了环墙的温度和收缩变形引起的裂缝,目前已在大型贮罐基础中采用,经过生产使用实践的考验,证明效果是很好的。采用这种结构不仅可以加快工程的进度,节约模板与钢材,还可使环墙结构更加合理。在上述基础上提出的环墙侧压力、环拉力和温度收缩应力的计算公式,可供工程设计中采用。
By measuring and investigating the lateral pressure on the side wall of large tanks, it was found that the lateral pressure of the annular wall is very small. The calculated value of the currently used ring tension formula is too large and the effects of temperature and shrinkage are not considered. We believe that although the internal forces that affect the inner wall of the ring wall and the cracks that occur around the wall are complex, they are mainly due to temperature and shrinkage. If the reinforcement is not properly made, it will cause vertical cracks in the ring wall. For this reason, on the basis of the actual survey, the structure of the ring wall was boldly reformed, and the cast-in-situ continuous type was changed to a prefabricated type, which fundamentally solved the temperature and cracks caused by the shrinkage deformation of the ring wall. It is used in the storage tank foundation. After the test of production and use practices, it proves that the effect is very good. Adopting this kind of structure can not only speed up the progress of the project, save the formwork and steel, but also make the ring wall structure more reasonable. On the basis of the above, the calculation formulas for the side wall pressure, ring tension, and temperature shrinkage stress proposed by the company can be used in engineering design.