基于坑蚀随机性的混凝土构件抗弯可靠性分析

The Reliability Analysis of Flexural Concrete Member Based on the Randomness of Pitting

为了研究随机分布的腐蚀对现役结构可靠性能的影响,采用验算点法,分析了基于坑蚀随机性的混凝土构件抗弯可靠性随分布数量和服役时间的发展规律.结果表明,坑蚀随机性对混凝土构件抗弯可靠性的影响显著,可靠指标随着独立同分布的随机变量的数目的增大而减小,并随着服役年限的增加下降较快.分析表明,研究基于坑蚀随机性的混凝土构件可靠性能的发展规律,为有效预测混凝土构件的寿命奠定了理论基础.

In order to analyze the influence of stochastic pitting corrosion to the reliability of service structure,according to the theory of extreme values of random variables and the basic theory of reliability analysis,the reliability of flexural concrete member based on the randomness of pitting,the change of statistical parameters for both corroded steel bar and resistance is also analyzed based on the randomness of pitting.Based on the checking point method,the development law of reliability of concrete bending members with the number of random variables and the service life are studied.The results indicat that the influence of the randomness of pitting to the reliability of flexural concrete members is of the most significance,the reliability index decline with the increase of number of random variables and the service life.The analysis shows that research presented in the paper can provide theoretical basis of life prediction.