斜腹板倾角对扁平箱梁颤振性能影响及量化研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (9) : 17-24.

论文

李志国1，王骑1,2，廖海黎1，魏益峰3

作者信息 +

Effects of inclined web slope on flutter performance of flat box girders and their quantification

LI Zhiguo1, WANG Qi1,2, LIAO Haili1, WEI Yifeng3

Author information +

文章历史 +

摘要

开展了斜腹板倾角对扁平箱梁颤振性能影响及颤振性能量化的研究。设计制作了仅改变斜腹板倾角，固定宽度和高度的两组节段模型，保持测试系统的动力参数不变，采用风洞试验的方式获得了不同模型的颤振性能。测试结果表明，当扁平箱梁的宽高比在11左右时，在+5°风攻角条件下，颤振临界风速受斜腹板倾角的影响较显著，而在0°风攻角下此影响不明显。当宽高比在7左右时，无论在0°或是+5°风攻角条件下，斜腹板倾角对于颤振的影响均不明显。利用测试获得的两组模型的颤振导数，发现了斜腹板倾角的改变会造成耦合导数H3*和直接导数A2*的显著改变，从而导致了颤振临界风速的显著变化。最后，根据试验数据和计算结果，采用颤振临界风速解析计算式中的颤振因子，量化了风攻角和斜腹板倾角对扁平箱梁颤振的影响，给出了不同条件下的颤振因子。相对于目前规范中颤振计算时的单一折减系数，条件化的颤振因子能够较准确地计算出扁平箱梁的颤振临界风速。研究成果也对如何有效改进扁平箱梁的气动布局有参考意义。

Abstract

Influences of inclined web slope on flutter performance of flat box girders and their quantification were studied. Two sets of sectional models with fixed width and height, and different slopes of inclined web were designed and fabricated, dynamic parameters of the detecting system were kept unchanging, and flutter performances of different models were obtained with wind tunnel tests. The results showed that when the ratio of width to height for flat box girders is 11, effects of inclined web slope on the flutter critical wind speed are significant under the condition of 5 wind attack angle, but they are not obvious under the condition of 0 wind attack angle; when the ratio of width to height is 7, effects of inclined web slope on flutter are not obvious under either 5 wind attack angle or 0 one; changes of inclined web slope make flutter coupled derivative H3* and flutter direct derivative A2* vary significantly to cause greater variation of flutter critical wind speed. Finally, according test data and calculating results, adopting the flutter factor in the analytical calculation formula for the flutter critical wind speed, effects of wind attack angle inclined web slope on flat box girders’ flutter were quantified. Flutter factors under different conditions were deduced. It was shown that compared with the single reduced factor in the current flutter calculation code, conditioned flutter factors can be used to accurately calculate the flutter critical wind speed for flat box girders. The results provided a reference for effectively improving the aerodynamic layout of flat box girders.

导出引用

李志国1，王骑1,2，廖海黎1，魏益峰3. 斜腹板倾角对扁平箱梁颤振性能影响及量化研究[J]. 振动与冲击, 2018, 37(9): 17-24

LI Zhiguo1, WANG Qi1,2, LIAO Haili1, WEI Yifeng3. Effects of inclined web slope on flutter performance of flat box girders and their quantification[J]. Journal of Vibration and Shock, 2018, 37(9): 17-24

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