摘要
以实际工程中的斜拉桥错列斜拉索为工程背景,设计了一套斜拉索风洞试验装置,对非平行的双排斜拉索进行了气弹模型风洞试验,研究了风攻角和风偏角对拉索振动的影响。试验观察到下游拉索发生明显的尾流驰振,尾流驰振的振幅及轨迹受风攻角与风偏角的影响显著。当风攻角为5°、风偏角为10°时下游拉索最容易发生大幅尾流驰振,因此将此组合工况定为最不利工况。针对此最不利工况施加了三种抑振措施,分别为刚性杆连接、弹性杆连接和增加阻尼,试验结果表明加刚性连接杆或弹性连接杆成功抑制尾流驰振,而当阻尼比小于0.68%时,增加阻尼对尾流驰振的抑振效果不明显。
The background of this study is a real cable-stayed bridge.A special support system was designed for wind tunnel tests.The effects of incidence angle and yaw angle on the wake induced vibration of two flexible staggered and unparalleled stay cables were investigated.Large wake galloping has been observed.The incidence angle and yaw angle of cables have significant impact on the amplitude and trajectory of the wake galloping.When the incidence angle equals 5°and the yaw angle equals 10°,the downstream cable is more prone to wake galloping.Therefore,this configuration is considered to be the most unfavorable case.Three suppression measures were applied to this unfavorable case.They are rigid connection rod,flexible connection rod,and additional damping.The results show that the rigid connection rod and the flexible connection rod successfully suppress the wake galloping of the downstream cable,while the effect of a little increase in additional damping is not apparent.
作者
蔡畅
何旭辉
敬海泉
秦成文
CAI Chang;HE Xuhui;JING Haiquan;QIN Chengwen(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Changsha 410075,China;Guangzhou Railway Group Co.,Ltd.,Guangzhou 510000,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第6期37-43,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(U1534206,51708559)
国家重点研发计划项目(2017YFB1201204)。
关键词
错列斜拉索
风洞试验
尾流驰振
抑振措施
staggered cables
wind tunnel test
wake galloping
vibration suppressing measures
