Analysis of fuzzy random reliability of elevation control of cable-stayed bridge at construction stage

作者：Yu, Xiao-Lin; Yang, Yong; Jia, Bu-Yu; Yan, Quan-Sheng

来源：Bridge Construction, 2014, 44(5): 112-117.

• Coefficient of variation
• Construction stages
• Elevation control
• Fuzzy membership function
• Fuzzy random reliability
• Influential factors
• Structural response
• Variable parameters

The problems of randomness and strong fuzziness exist in the process of elevation control of cable-stayed bridge at construction stage. To achieve better effect of the elevation control, the random finite element method was used to solve the structural response gradients of the bridge and by the method of equivalently transforming the fuzzy membership functions to the random density functions, the fuzzy random reliability of the elevation control was obtained. The Jiujiang Reconstructed Cable-Stayed Bridge was cited as an example, the sensitivity analysis of the random variable parameters of the bridge was implemented, the fuzzy random reliability of the elevation control was calculated and a number of the influential factors related to the random reliability were analyzed. The results of the analysis suggest that the volume weight of the steel main girder and the elasticity modulus of the stay cables are the random variables of great sensitivity. The results obtained from the method of defining the failure zone in a certain space interval by considering the randomness and fuzziness of the elevation control failure and by using the membership functions are more practical. The proper increase of the boundary value of the elevation control success and the choice of the optimal boundary value of the elevation control failure can better achieve the success rate of the elevation control of the cable-stayed bridge at construction stage.

• 出版日期2014-10-28
• 单位华南理工大学