Ambient Vibration Test and Analysis of a Single Pylon Cable-Stayed Bridge

Bridge ambient vibration test has some advantages such as simpleness,convenience and cheapness.Linjiangmen Bridge located in Jilin City of Jilin Province is taken as engineering example in this paper.The intrinsic characteristics of the bridge under natural vibration were investigated based on dynamic tests.Then the bridge intrinsic characteristics under natural vibration were calculated using the structure analysis software ANSYS.The results from finite element calculation coincide with the results from dynamic test,which demonstrates that the ambient vibration responses are sufficient for identification of most significant modes for this kind of cable-stayed bridges and can serve as the basis in finite element model updating,damage detection,bridge condition assessment and health monitoring.