Investigation of Vortex-Induced Vibration of Double-Deck Truss Girder with Aerodynamic Mitigation Measures

The long-span double-deck truss girder bridge has become a recommend structural form because of its good performance on traffic capacity. However, the vortex-induced vibration (VIV) characteristics for girders are more complicated and there is lack related research. In this research, wind tunnel tests were utilized to investigate VIV large-span bridge. Meanwhile, suppression effect aerodynamic mitigation measures was measured. Furthermore, mechanism studied from perspective vortex shedding characteristics. results indicated that had significant when attack angles +3° +5°. an influence response girder. upper chord fairing lower inverted L-shaped deflector plate played crucial role in suppressing VIV. Numerical analysis above deck or wake region may dominate vertical VIV, while torsional disrupted original pattern both regions, thereby This research can provide foundation design bridges.