基于可拓学的混凝土双曲拱桥上部结构可靠性评价

Reliability assessment for superstructure of concrete double-curved arch bridge based on extenics

为了对混凝土双曲拱桥上部结构可靠性进行合理评价,在物元模型理论的基础上结合实际工程病害,建立混凝土双曲拱桥上部结构可靠性评价物元模型.引入可拓集合中的关联函数与关联度,通过实际可靠性等级的关联度计算对某双曲拱桥上部结构可靠性进行评价.结果表明:桥梁上部结构可靠性状态处于二类且略偏于三类,与实际工程状况相符.可拓评价方法引入级别变量特征值,可充分反映可靠程度与相邻等级的距离,克服了传统的跳跃式评价的缺点,实现了可靠性评价的连续化,在其他工程领域也有广阔的应用前景.

In order to reasonably evaluate the reliability of superstructure of concrete double-curved arch bridge,a matter-element model for the superstructure of concrete double-curved arch bridge was established based on the matter-element theory in combination with the actual engineering disease. Both correlation function and correlation degree in the extension set were introduced,and the reliability of superstructure of certain concrete double-curved arch bridge was evaluated through the calculation of correlation degree in the actual reliability level. The results showthat the reliability status of superstructure of bridge belongs to the second-class but is slightly deflective to the third-class, which is in good agreement with the actual engineering condition. The extension assessment method introduces the eigenvalues of grade variables,and can fully reflect the distance between the reliability degree and adjacent rank. Therefore,the proposed method can overcome the shortcomings of leap type assessment in traditional assessment methods and realize the continuous reliability assessment,and has broad application prospects in other engineering fields.