国外某桥风致振动的抑制措施  

Suppressing Measures for Wind-Induced Vibration of a Foreign Bridge

作　　者：沈庆龙[1] 

机构地区：[1]中铁大桥局集团第二工程有限公司,江苏南京210015

出　　处：《世界桥梁》2008年第A01期11-13,共3页World Bridges

摘　　要：国外某桥主跨3×224 m连续钢桁拱为中承式刚性拱柔性梁结构,在安装钢梁过程中,部分吊杆发生涡激振动,通过对钢桁拱吊杆增设纵向水平拉杆及横向联结系和将H形截面改为矩形截面的抑振措施,减小了吊杆的自由长度,提高了涡振发展风速,有效抑制了吊杆的风致振动。The continuous steel truss arch for the 3 × 224-m main spans of a foreign bridge is a half-through rigid arch and flexible girder structure. In the process of erection of the steel truss girder of the bridge, the vortex-induced vibration occurred on part of the suspenders of the steel truss arch. By applying the suppressing measures of adding longitudinal horizontal tie members and lateral bracing system to the suspenders of the arch and alternating the H-shape sections of the suspenders into the rectangular ones, the free length of the suspenders was reduced, the vor- tex shedding wind speed was raised and the wind-induced vibration of the suspenders was effectively suppressed.

关 键 词：钢桁拱 钢吊杆 涡激振动 驰振 抑振措施 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]