Cable-stayed bridge model updating based on static and dynamic test data of multi-state

Based on the parameter sensitivity analysis and ANSYS optimization technology, updating of the static displacement and modal test results gotten through static and dynamic test of concrete cable-stayed bridge was done. During updating, a reasonable simulation of the boundary condition was given, vibration mode was classified, and modal match was carried out only in the same type of mode. The objective function was calculated by the sum of squares of percentage deviations between static displacement, frequency, modal assurance criterion (MAC) values and corresponding measured values. After imposing a layer uniform distributed load on the bridge deck, the modal results of the structure changed a lot. The updated finite element model was checked by the test modal and static displacement results of this state. Results show that after the model updating, not only the static displacement and modal results which involve in optimization are more consistent with the measured values, but also the high level frequencies are closer to the measured values. It proves that updated finite element model can accurately simulate the actual structure and can be used as the norm finite element model.