附加风攻角对1400m斜拉桥颤振分析结果的影响  

Influence of additional attack angle on flutter performance of a 1400m long cable stayed bridge

作　　者：张宏杰[1,2] 朱乐东[2] 

机构地区：[1]中国电力科学研究院,北京100055 [2]同济大学桥梁工程系

出　　处：《振动与冲击》2013年第17期95-99,共5页Journal of Vibration and Shock

基　　金：国家高技术研究发展计划-863计划(2006AA11Z120)

摘　　要：1400m钢箱梁斜拉桥更为轻柔化,颤振性能受附加风攻角的影响不容忽视。在对其进行频域颤振分析时,不同的颤振导数识别风洞试验以及不同的颤振分析方法对于附加风攻角的包含程度各不相同,将两者组合使用后导致得到的颤振分析结果也势必存在差异。而在这些结果中哪些分析结果更为合理有待明确。通过对比四种可能情况下得到的颤振分析结果,1 400 m钢箱梁斜拉桥在附加风攻角的影响下,颤振分析结果体现了下述规律:基于强迫振动节段模型试验得到的颤振导数,采用考虑附加风攻角影响的颤振分析方法,得到的颤振分析结果更为合理;而基于自由悬挂节段模型试验得到的颤振导数,采用不考虑附加风攻角影响的颤振分析方法,得到的颤振分析结果仅部分包含了附加风攻角的影响;其他两种情况下得到的颤振分析结果均不正确。Due to low rigidity, influence of additional attack angle on flutter performance of a 1400 m long steel box girder cable stayed bridge can not be neglected. In a flutter analysis process, the containing level of additional attack angles are different to different wind tunnel tests used for identification of flutter derivatives, and different theoretical analysis methods. As a result, the differences among the results obtained with combined applications of wind tunnel tests and flutter analysis methods can not be avoided. Here, by contrasting the analysis results derived for four possible situations under influence of additional attack angle, it was shown that the analysis results based on flutter derivatives obtained from forced vibration section model test and considering influence of additional attack angle on the flutter analysis method are more reasonable; the results based on flutter derivatives obtained from free hanging section model test and without considering influence of additional attack angle on the flutter analysis method only contain influence of additional attack angle partially; the results obtained from the other two situations are not correct.

关 键 词：附加风攻角 强迫振动节段模型试验 自由悬挂节段模型试验 频域颤振分析 大跨度桥梁 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]