斜拉桥有限元建模与模型修正

Finite Element Modeling and Model Updating of a Cable-Stayed Bridge

以圆弧桥面、单偏置斜塔的 Safti斜拉桥为对象 ,研究了斜拉桥的有限元建模技术和基于敏感度分析的有限元模型修正技术及其对该桥的应用。基于该桥现场测量的模态数据 ,修正后的有限元模型获得了较好的改善。

Bridges are indispensable components of the infrastructure of modern society. Cable-stayed bridges are more attractive for their unique structural styles and aesthetic reasons. The finite element analysis results such as dynamic properties are not always consistent with the measured results due to the modeling errors and uncertainties of the structural parameters. It is necessary to improve the finite element model for reliable analytical results of the structures. This paper investigates the finite element modeling technology of the Safti Bridge, a cable-stayed bridge with a curved deck and single offset pylon in Singapore, and the application of sensitivity-based model updating technology to the bridge. Based on the measured modal data from prototype testing, the updated finite element model of the bridge has been significantly improved by modifying of uncertain structural parameters.