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| VIV Performance and optimization measure mechanism of PK box girder with cantilever arm |
| LI Chunguang, HE Xiaolong, HUANG Xiao, YAN Hubin, HAN Yan |
| School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China |
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Abstract In order to study the vortex-induced vibration(VIV) performance and aerodynamic optimization measures of PK box girder with cantilever, the VIV performance of PK box girder at 0 ° and ± 3 ° wind attack angle is studied through segmental model wind tunnel test, and the effects of aerodynamic measures such as sidewalk height, closing the bottom of cantilever, change of railing air permeability and deflector with different inclination angles on the aerodynamic stability of box girder with PK section are tested. The results show that the main beam has strong vertical VIV resonance and multiple vertical vortex vibration intervals at 0 ° and + 3 ° wind attack angle. At the same time, the main beam has obvious torsional vortex vibration at high wind speed. Increasing the height of the sidewalk can reduce the vertical VIV response of the main beam at each angle of attack, and the torsional vortex vibration at high wind speed can be greatly depressed; Through the study of changing the air permeability by closing the railing, it is found that spaced closing the outside guardrail of the sidewalk at vertical can destroy the correlation of vortex induced aerodynamic force in the spanwise direction and reduce the vortex induced peak response of the main beam to 55.8% of the specification limit; The deflector with 0.25m can effectively improve the aerodynamic stability of the main beam. When the inclination of the deflector changes between 20 ° ~ 75 °, it can completely suppress the vortex vibration response of the main beam.
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Received: 06 September 2023
Published: 15 June 2024
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