Finite element model updating for the Runyang Cable-stayed Bridge tower using ambient vibration test results

The finite element (FE) model updating method aims to fit the parameters of a given initial analytical model in such a way that the model behavior corresponds as closely as possible to the measured behavior. However, the success of applications of the method depends on the analytical conceptualization of complex civil engineering structures, a well-designed and controlled modal test and an integration of analytical and experimental arts. This paper presents a sensitivity-analysis-based FE model updating procedure for FE model updating of Runyang Cable-stayed Bridge tower based on ambient vibration measurements. The updated model results correlate well with the experimental data in both the active frequency range and the passive frequency range. Extensive comparisons are made among the results obtained from different model updating cases. It is found that the appropriate initial FE model and determination of updating parameters are very important for the FE model updating of Runyang Cable-stayed Bridge tower.