Test study on effects of railings on vortex-induced vibration performance of blunt&nbsp;box girder pedestrian bridge

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (11) : 254-267.

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Test study on effects of railings on vortex-induced vibration performance of blunt box girder pedestrian bridge

WANG Weihong1, LI Leyan2, LI Jiayu3, CHEN Ming4, LI Yu*2, LI Jiawu2

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Abstract

With the urbanization in China, the construction scale of pedestrian bridges has increased significantly. As a necessary accessory facility in the design of pedestrian bridges, the railing played an important role in the design of the aerodynamic shape. Due to the small size of the pedestrian bridge's main girder, the railing significantly affects its aerodynamic shape and vortex-induced vibration performance. To study the effect of railings on the vortex-induced vibration performance of pedestrian bridges, the vortex-induced vibration performance of the original section without railings, and the effects of rectilinear railings' air permeability β, air permeability width T and curvilinear railings' wavelengths W, amplitudes Z and installation positions on the vortex-induced vibration performance of the main girders are investigated by using vibration measurement tests. By analyzing the law of vortex-induced vibration response of the main girder under each working condition, the mechanism of rectilinear and curvilinear railings affecting the vortex-induced vibration performance of the main girder is explored. It was found that: The smaller the air permeability β was, the smaller the vortex-induced vibration amplitude of the main beam was. Choosing a reasonable air permeability of the railing can significantly improve the vortex-induced vibration performance of the main girder. Under the same air permeability, the effect of the air permeability width T of the rectilinear railing on the vortex-induced vibration amplitude is negligible. Increasing the wavelength W and amplitude Z of the curvilinear railings can reduce or even completely suppress vortex-induced vibration. The vortex-induced vibration performance of the main girder is more sensitive to the air permeability and installation position of the curvilinear railings, and the effect of vibration suppression can be achieved by lowering the air permeability or moving the installation position of railings to the outer side of the girder.

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pedestrian bridges / vortex-induced vibration / blunt box girder / curvilinear railings / wind tunnel test

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WANG Weihong1, LI Leyan2, LI Jiayu3, CHEN Ming4, LI Yu2, LI Jiawu2. Test study on effects of railings on vortex-induced vibration performance of blunt box girder pedestrian bridge[J]. Journal of Vibration and Shock, 2025, 44(11): 254-267

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