Dynamic assessment of curved cable stayed bridge by model updating

Most of the previous sensitivity-based model tuning methods are automatic iterative processes; however, the results of recent studies show that the most reasonable results are achievable by applying the manual methods to update the analytical model of cable-stayed bridges.This paper presents a model updating algorithm for highly redundant cable-stayed bridges that can be used as an iterative manual procedure.In the process of the bridge finite element analysis, factors to consider should be more comprehensive and the way to simulation should be more realistic so that the results of finite element simulation can be closer to the actual.

The finite element method (FEM) (its practical application often known as finite element analysis) is a numerical technique for finding approximate solutions of partial differential equations (PDE) as well as integral equations.

In the past decade the construction of cable-stayed bridges has increased and their span lengths are growing due to improvements in design and analysis technologies.

However, the complex structural characteristics of long-span cable-stayed bridges cause difficulties in understanding their dynamic behavior and make them vulnerable to dynamic loadings from phenomena such as wind or earthquakes.

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The frequencies of the normal modes of a system are known as its natural frequencies or resonant frequencies.

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