上、下组合中央稳定板对于箱梁颤振性能的影响  

Influence of Combined Central Stabilizing Plates on Flutter Performances of Box Girder

作　　者：夏锦林 杨詠昕[1] 葛耀君[1] XIA Jin-lin YANG Yong-xin GE Yao-jun(State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, Chin)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《中国公路学报》2017年第7期86-93,共8页China Journal of Highway and Transport

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)

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。In order to compare flutter performances of sections with different heights of both onesided and combined plates and investigate their diverging mechanisms under various attack angles,a series of wind tunnel tests on sectional model were carried out in allusion to a given single-box suspension bridge.The influence of one-sided stabilizing plates under attack angels of 3°,0°and -3°respectively on flutter performances was firstly investigated.Then,effects of wind resistance under corresponding attack angles were explored by simultaneously changing the height of central stabilizers at both sides.Moreover,values of the optimal height of combined stabilizing plates was given.Finally,the diverging mechanism for the initial section and the optimal section was compared by 2d-3DOF method.The results show that flutter critical wind speed of one-sided central stabilizing plates increases first and then decreases with the increasing height of stabilizing plates.The flutter critical wind speed of stabilizing plates with the proper height grows to some extent.Compared with one-side stabilizing plates,a section with combinedplates is better to improve the aerodynamic stability.The 2d-3DOF analysis indicates the flutter diverging mechanism is dramatically changed by central stabilizing plates.The variation trends of the aerodynamic damping with wind speed are obviously different in the optimal section and the initial section.

关 键 词：桥梁工程 中央稳定板 风洞试验 颤振性能 二维三自由度方法 箱梁 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]