Experimental Study on Vortex-Induced Vibration Performance and Countermeasures for Side Girder Beam with Conveyer
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摘要:
桥面输送机改变了边主梁的气动外形，为研究其涡振性能及抑振措施，开展了1.00∶20.00刚性节段模型自由悬挂风洞试验. 首先，研究了带输送机边主梁断面涡振性能，并测试了结构阻尼比对其的影响；其次，对比了有、无输送带边主梁的涡振性能；最后，采用风嘴、梁底稳定板、水平隔流板等气动措施对主梁断面涡振性能进行了优化研究. 结果表明：带输送机边主梁在规范要求的0°、±3° 风攻角下的涡振性能均较差，最大超出规范限值286%；桥面输送机降低了主梁的涡振稳定性，涡振响应峰值提高了44%；梁底安装稳定板有利于改善主梁的涡振性能，并且与梁底同高的稳定板制振效果随其数量的增加而更优，安装3道1.5 m下稳定板对主梁涡振抑制效果达93%；伸出梁底0.5 m的2.0 m高中央稳定板能完全抑制主梁涡振；风嘴对主梁的涡振性能影响较弱，但在一定范围内具有最优角度取值；梁底单独布置水平隔流板，涡振响应峰值降低17%；优化主梁截面采用风嘴 + 风嘴水平分流板 + 1 m宽水平隔流板，主梁涡振响应峰值降低92%，且远低于规范限值.
Abstract:Conveyers on the bridge deck change the aerodynamic shape of the side girder. In order to explore the vortex-induced vibration performance and countermeasures of the side girder with a conveyer, a 1.00∶20.00 rigid segment model test of free suspension is carried out in wind tunnel. Firstly, the vortex-induced vibration performance of the side girder beam section with a conveyer is studied, and tests are conducted as to how it is affected by structural damping ratio. Secondly, the cases of whether a conveyer is equipped are compared. Finally, aerodynamic measures such as air nozzles, stabilizing plates at beam bottom, and horizontal baffles are used to optimize the vortex-induced vibration performance of the main girder section. The results show that the vortex-induced vibration performance of the side girder with a conveyer is poor at the specified 0° and ± 3° wind attack angles, and the maximum exceeds the specification limit value by 286%. The deck conveyer reduces the vortex-induced vibration stability of the main girder, and the peak value of the vortex-induced vibration response increases by 44%. The installation of stabilizing plates at beam bottom is beneficial to improve the vortex-induced vibration performance of the main beam, and the effect of stabilizing plates with the same height as the bottom of the beam becomes better with the increase in the number of stabilizing plates. The vortex-induced vibration suppression effect of the main beam is 93% when installing three stabilizing plates with a depth of 1.5 m. The 2.0 m high middle stabilizing plate extending 0.5 m from beam bottom can completely suppress the vortex-induced vibration. The nozzle has a little influence on the vortex-induced vibration performance of the main beam, but it has an optimal angle value in a certain range. When a horizontal baffle is separately arranged at the beam bottom, the peak value of vortex-induced vibration response is reduced by 17%. A combined measure of a nozzle, nozzle horizontal splitter plate, and horizontal baffle of 1 m width is adopted to optimize the main beam section, and the peak value of the vortex-induced vibration response of the main beam is reduced by 92%, which is far lower than the specification limit.
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图 4 阻尼比对主梁涡振响应的影响
Figure 4. Influence of damping ratio on vortex-induced vibration performance of main girder
图 5 输送机对主梁涡振响应的影响
Figure 5. Influence of conveyer on vortex-induced vibration performance of main girder
图 7 风嘴角度对主梁涡振响应的影响
Figure 7. Influence of air nozzle angle onvortex-induced vibration performance of main girder
图 9 梁底稳定板对主梁涡振响应的影响
Figure 9. Influence of stabilizing plates onvortex-induced vibration performance of main girder
图 11 水平隔流板对主梁涡振响应的影响
Figure 11. Influence of horizontal baffles onvortex-induced vibration performance of main girder
图 13 组合措施对主梁涡振响应的影响
Figure 13. Influence of combined countermeasure on vortex-induced vibration performance
表 1 模型与实桥参数
Table 1. Parameters of model and prototype
项目 长度/m 宽度/m 单位质量/
（kg•m−1）单位质量惯性矩/
（kg•m2•m−1）竖向
频率/Hz扭转
频率/Hz风速比 竖向阻尼比/% 扭转阻尼比/% 实桥 30.40 12.12 5976.00 136055.00 0.539 0.857 模型 1.52 0.61 14.94 0.85 5.643 8.655 0.25 0.28 缩尺比 1.00∶20.00 1.00∶20.00 1.00∶400.00 1.00∶160 000.00 1.00∶10.46 1.00∶10.09 1.00∶1.91 
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表 2 气动措施优化工况
Table 2. Aerodynamic optimization measures
工况 措施 状态 1 原设计断面 2 风嘴 45° 3 60° 4 78° 5 90° 6 下稳定板 1 道 1.5 m下稳定板 7 2 道 1.5 m下稳定板 8 3 道 1.5 m下稳定板 9 1 道 2.0 m下稳定板 10 水平
隔流板0.6 m 11 1.0 m 12 组合
措施工况 4 + 工况 10 + 0.3 m 风嘴水平分流板 13 工况 4 + 工况 11 + 0.3 m 风嘴水平分流板
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