摘要
以在建斜拉桥倒角方形截面桥塔为工程背景,通过节段模型风洞静力试验研究了该截面形式桥塔在风场中的驰振特性。试验数据表明,桥塔在0°~5°风向角区间时存在驰振失稳的可能,采用45°直倒角对方形截面的驰振性能极为不利。随后在桥塔倒角处分别加设了圆弧形导流板和矩形垂直翼板,发现2种气动措施均可以有效提高倒角方形桥塔的驰振稳定性能。
Taking a tower of cable-stayed bridge with chamfer square section under construction as the engineering background,the galloping characteristics of the tower in the wind field were studied through the static wind tunnel test of the segment model.The test results show that the galloping instability will occur at the wind yaw angle from 0° ~5°,the use of 45° chamfer is extremely unfavorable to the galloping performance of a square section.Subsequently, circular arc baffles and rectangular vertical fins were installed on chamfers of the tower.It is found that two aerodynamic measures can effectively improve the galloping stability of the tower with chamfer square section.
出处
《铁道建筑》
北大核心
2017年第12期33-35,44,共4页
Railway Engineering
关键词
独塔斜拉桥
倒角方形桥塔
风洞试验
驰振
圆弧形导流板
矩形垂直翼板
cable-stayed bridge
chamfer square section
engineering background
characteristics
tower
tunnel test
segment model
