随着我国城市化进程的推进，人行桥建设规模显著增加。栏杆作为人行桥设计的必要设施，在气动外形设计中起重要作用。并且由于人行桥主梁尺寸较小，栏杆显著影响其气动外形和涡振性能。为研究栏杆对人行桥涡振性能的影响，采用测振试验研究了无栏杆原始断面的涡振性能，以及直线栏杆透风率β、透风宽度T与曲线栏杆波长W、振幅Z和安装位置对主梁涡振性能的影响。通过分析各个工况下主梁涡振响应的规律，探讨了直线栏杆和曲线栏杆设计参数的改变影响主梁涡振性能的机理。结果表明：透风率β越小，主梁涡振振幅越小。选择合理的栏杆透风率可显著改善主梁涡振性能。在相同透风率下，直线栏杆透风宽度T对涡振振幅的影响可忽略不计。增大曲线栏杆的波长W和振幅Z可减小甚至完全抑制涡振现象。主梁涡振性能对曲线栏杆透风率和安装位置较敏感，降低透风率或将栏杆安装位置向梁外侧移动，可起到抑振效果。
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.
关键词
人行桥 /
涡激振动 /
钝体箱梁 /
曲线型栏杆 /
风洞试验
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Key words
pedestrian bridges /
vortex-induced vibration /
blunt box girder /
curvilinear railings /
wind tunnel test
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