整体吊装钢管混凝土系杆拱桥施工风险非线性模糊评判

Nonlinear Fuzzy Evaluation of Construction Risk of Integral Hoisting CFST Tied Arch Bridge

为完善传统模糊评判方法,体现模糊评判过程中的非线性特征,针对整体吊装钢管混凝土系杆拱桥施工风险特点,提出一种基于结构熵权的非线性模糊评判方法。依据施工工序,对整体吊装钢管混凝土系杆拱桥施工过程进行风险源识别,建立施工风险层次评价体系,识别过程同时考虑结构安全与人员安全。基于风险源识别结果,构建整体吊装钢管混凝土系杆拱桥二级模糊评判计算模型,采用主观赋权法与客观赋权法相结合的结构熵权法求解权重,引入非线性模糊算法,反映高风险指标对评判结果的突出影响,进而建立整体吊装钢管混凝土系杆拱桥施工风险非线性模糊评判方法。最后,通过工程实例的分析计算,表明了该方法的可行性与有效性。

In order to improve traditional fuzzy evaluation method and reflect the nonlinear characteristics of fuzzy evaluation, a nonlinear fuzzy evaluation method based on structure entropy weight is proposed according to the construction risk characteristics of integral hoisting CFST tied arch bridge. The risk sources during construction process of integral hoisting CFST tied arch bridge are identified considering structural safety and personnel safety, and a construction risk level evaluation system is established. A 2-level fuzzy evaluation calculation model of integral hoisting CFST tied arch bridge is established based on the identification result. The structure entropy weight method which combines subjective assignment method with objective assignment method is adopted to calculate the weights. Nonlinear fuzzy algorithm is introduced to reflect the prominent effect of high risk indicators on the evaluation result. Then, the nonlinear fuzzy evaluation method of construction risk of integral hoisting CFST tied arch bridge is established. Finally, this method is proved to be feasible and effective through the analysis of engineering example.