为研究带挑臂PK箱梁的涡振性能及气动优化措施，通过节段模型风洞试验研究了PK箱梁在0°、±3°风攻角下的涡振性能，并测试了人行道高度、封闭挑臂底部、栏杆透风率改变、不同倾角抑流板等气动措施对PK箱梁气动稳定性的影响，研究表明：主梁在0°、+3°风攻角下出现强烈的竖向涡激共振，并出现多个竖向涡振区间，同时在高风速下主梁出现了明显的扭转涡振；抬高人行道高度能降低各攻角下主梁的竖弯涡振响应，同时高风速下的扭转涡振得到极大程度的改善；通过封闭栏杆来改变栏杆透风率的研究发现，竖向间隔封闭人行道外侧护栏能破坏涡激气动力在展向的相关性，将主梁涡振峰值响应降低至规范限值的55.8%；0.25m宽抑流板能有效改善主梁气动稳定性，抑流板倾角变化在20°~75°之间时，其均能完全抑制主梁涡振响应；气流在迎风侧人行道护栏处发生分离，在上表面卷起形成规律的大尺度旋涡，从而造成主梁剧烈的涡激振动，抑流板明显破坏了挑臂附近旋涡的形成，无法向下游发展形成规律的大尺度旋涡，从而能有效抑制主梁涡振。
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.
关键词
PK箱梁 /
风洞试验 /
涡振性能 /
气动措施
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Key words
box girder of PK section /
wind tunnel test /
VIV performance /
countermeasure
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