Dynamic Analysis of Prestressed Concrete Multi-span Continuous Urban Viaduct Beam Bridge under Moving Highway Vehicle Load

摘要

The interaction between the moving highway vehicle and the bridge results in complicated vibration of the highway vehicle and the viaduct bridge structure. Based on the vertical vibration analysis theory of the vehicle-bridge time-variant system, a finite element model of the highway vehicle and the prestressed concrete viaduct beam bridge was proposed. Where the highway vehicle was considered as a seven-freedomed multi-body system, the viaduct bridge was discretized as beam finite elements. With the irregular roughness of the deck as the vertical vibration source, a vibration analysis program VSB-2 of the vehicle-bridge time-variant system of the prestressed concrete multi-span continuous urban viaduct beam bridge under moving highway vehicle load was developed, and the vibration response and the vehicle running performance were calculated when the highway vehicle ran through the viaduct bridge at the designed speed under different operating conditions. The work could be a valuable reference for the shock-absorbing design and the engineering practice of the urban viaduct bridge.