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船对海洋平台的撞击是平台可能产生的主要灾难之一,目前仍是国际上正在研究的课题。现有的冲切计算公式多为基于平板冲切试验的经验公式,为此有必要在试验基础上,对环形断面管柱局部冲切破坏进行理论上的分析和研究。本文在试验的基础上,利用极限分析中的上限定理,通过选择合理的屈服条件,假定破坏机构,得到了钢筋混凝土圆管柱冲切极限承载力的半理论计算方法,并利用此方法与本试验及国外有关试验进行了分析和比较、结果令人满意。本文提供的上限解与荷兰J·Brakel的纯经验公式相比,不仅有较强的理论基础,而且有相似的准确度及变异性。
The impact of the ship on the offshore platform is one of the major disasters that the platform may produce. Currently, it is still an international research topic. The existing punching calculation formulas are mostly based on the empirical formula of the flat blanking test. Therefore, it is necessary to theoretically analyze and study the partial punching and destruction of circular section tubular columns on the basis of the test. On the basis of experiments, using the upper limit theorem in limit analysis, by selecting a reasonable yield condition and assuming a failure mechanism, a semi-theoretical calculation method for the ultimate bearing capacity of reinforced concrete round tubular columns is obtained, and this method and this method are used. The tests and foreign related tests were analyzed and compared, and the results were satisfactory. The upper bound solution provided by this paper has not only a strong theoretical basis, but also similar accuracy and variability compared with the pure empirical formula of J. Brakel in the Netherlands.