摘要
基于厦深铁路榕江特大钢桁拱桥,通过风洞试验研究了矩形箱式吊杆的气动稳定性.分别通过天平测力和弹性悬挂测振试验,测试了矩形箱式吊杆在不同风向下的三分力系数和振动响应.研究结果表明,该吊杆在弱轴向与强轴向分别存在一个驰振失稳区间,而且在不高的风速下会发生涡振与驰振没有明显分界点的大幅弯曲振动.改变阻尼比的试验发现,抑制箱型吊杆弱轴与强轴的风振所需的最小阻尼是不一样的,该结果可以为吊杆TMD的设计安装提供参考.
Based on the Rongjiang super-span steel truss arch bridge of Xiamen-Shenzhen Railway,the aerodynamic performances of rectangular box suspenders are investigated with wind tunnel experiments.Three static force coefficients and wind induced vibration of the suspender are measured by force balance and elastically-suspended dynamic tests of sectional models respectively.The results show that the suspenders with rectangular section are susceptible to galloping instability in both weak and strong axis,and rather larger amplitude vibration induced by combined vortex vibration and galloping without distinct separation may take place at a wind speed.The tests with different damping ratios find that the minimum damping for suppressing the wind induced vibration are different in weak axis and strong axis,which will provide references to the design of TMD of rectangular box suspenders.
出处
《长沙理工大学学报（自然科学版）》
CAS
2011年第4期49-53,共5页
Journal of Changsha University of Science and Technology:Natural Science
关键词
钢桁拱桥
吊杆
风洞试验
风致振动
阻尼
steel-truss-arch bridge
suspender
wind tunnel experiment
wind-induced vibration
damping
作者简介
尤庆忠（1965-），男，安徽桐城人，厦深铁路广东有限公司副总工程师，高级工程师，主要从事高速铁路方面的研究．
