Modal Analysis of Self-Vibration Characteristics of the long-span through CFST Arch Bridges

Abstract: The general finite element analysis software ANSYS10.0 was adopted to set up a three-dimensional finite element model of a through concrete-filled steel tubular(CFST) tied arch bridge.The self-vibration modes and vibration frequencies of the bridge's anterior 10 steps were calculated,the modal characteristics were analyesed.Main design parameters such as ratio of rise to span and stiffness of the arch ribs have different influence on the bridge structural self-vibration characteristics.The calculating results showed that related technical parameters for this kind of bridge's optimization design,study,health monitoring and maintenance can be offered.