Numerical investigation of concrete-filled steel tubular tied arch bridge under travelling vehicles

摘要

A theoretical research in relation to the dynamic impact effects of concrete-filled steel tubular (CFST) tied arch bridge under travelling vehicles was described. The equations of the coupled system were derived based on Modal Coupled Method and solved with Wilson-θ method. The mathematical model assumed a three dimensional finite element representation of the bridge together with beam, shell, and link elements. And the vehicle simulation employed a 3D linear vehicle model with seven degrees of freedom. A well-known power spectral density of road pavement profiles defined the deck surface roughness for Perfect, Good, and Poor roads respectively. In this way, the dynamic interaction between the bridge and vehicle model was simulated. And the dynamic amplification factors (DAF) were computed for displacement and internal force respectively. The impact effects of the vehicle on different bridge members and influence factors were studied. Meanwhile, the acceleration responses of some components were analyzed in the frequency domain. Some valuable conclusions have been drawn from the results.