上、下组合中央稳定板对于箱梁颤振性能的影响

发布时间：2018-03-26 04:47

本文选题：桥梁工程　切入点：中央稳定板　出处：《中国公路学报》2017年07期

【摘要】：为比较不同高度稳定板单侧和上、下组合设置时断面的颤振性能,并说明设置中央稳定板前后不同攻角下颤振发散机理的改变,针对一特定的单箱断面悬索桥,设计并开展了一系列节段模型风洞试验。首先研究了3个攻角(3°,0°,-3°)下单侧设置稳定板对颤振性能的影响,进而同时改变上侧和下侧稳定板的高度,探索对应攻角下断面的抗风效果,从而给出稳定板组合设置时的最优高度取值。结合二维三自由度颤振分析方法(2d-3DOF),分析了最优中央稳定板组合设置断面相比于原始断面颤振发散机理的变化。结果表明:无论是上侧或下侧,单侧设置稳定板断面的颤振临界风速基本呈随着稳定板高度先增大后减小的趋势,合理高度的稳定板能提高颤振临界风速;相比于单侧稳定板,同时设置上、下稳定板对于气动稳定性能的改善效果更佳;二维三自由度分析结果显示,中央稳定板显著改变了颤振发散驱动机理,组合设置稳定板的最优断面和原始断面气动阻尼随风速的变化趋势明显不同。
[Abstract]:In order to compare the flutter performance of single side, upper and lower sections of different height stabilized plates, and to explain the change of flutter divergence mechanism before and after setting central stable plates, a specific single box section suspension bridge was designed. A series of segmental model wind tunnel tests were designed and carried out. Firstly, the influence of single side stabilizing plate on flutter performance was studied under three angles of attack (3 掳/ 0 掳/ 3 掳), and the height of upper and lower side stabilizers was changed at the same time. To explore the wind-resistant effect of the cross-section corresponding to the angle of attack, In this paper, the optimal height of the composite plate is given, and the variation of flutter divergence mechanism of the optimal central stable plate combination section compared with the original section is analyzed by using the two dimensional three degree of freedom flutter analysis method and the 2d-3DOF method. It shows that, whether it is the upper side or the lower side, The flutter critical velocity of the single side stable plate section increases first and then decreases with the height of the stabilizing plate, and the reasonable height of the stabilizing plate can increase the critical flutter velocity, compared with that of the single side stable plate, at the same time, the stability plate can increase the critical flutter velocity. The results of 2-D three-degree-of-freedom analysis show that the central stabilizer significantly changes the mechanism of flutter divergence. The variation trend of aerodynamic damping with wind speed is obviously different between the optimal section and the original section of the composite stable plate.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：国家重点基础研究发展计划(“九七三”计划)项目(2013CB036301) 国家自然科学基金重大项目(91215302);国家自然科学基金优秀重点实验室项目(51323013)
【分类号】：U441.3

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