摘要
随着交通业及旅游业的发展,近年来不断出现桥梁在满足其交通运输功能的前提下同时开发诸如旅游等方面的其他可利用功能,导致结构气动外形及透风率发生显著变化。该文以某主跨1088 m的双塔单跨钢桁架悬索桥为背景,通过全桥气弹模型风洞试验对其抗风性能进行重新评估,在研究结构抗风稳定性的前提下评估行人舒适度问题。结果表明:基于景区开发的桥梁气动外形改变前后结构动力特性几乎不变,且均未发生涡激振动及颤振等空气动力失稳;气动外形改变后结构横向及竖向的静风位移响应明显增大,在扭转方向二者存在一定差异但没有显著的规律性;基于景区开发的桥梁气动外形改变导致结构竖向抖振响应减小,但横向及扭转抖振响应均显著增大,经计算,结构舒适度满足设计要求。
The development of the transportation and tourism industry has led to bridges fulfilling additional roles,such as tourism,alongside their transportation functions,resulting in significant changes in structural aerodynamic shape and ventilation rate.This paper analyzed a double-tower single-span steel truss suspension bridge with a main span of 1088 m,re-evaluated its wind resistance performance through the full-bridge aeroelastic model wind tunnel test,and evaluated the pedestrian comfort problem while studying the windresistant stability of the structure.The results indicate that the structural dynamic characteristics of the bridge remain almost unchanged before and after altering the aerodynamic shape of the bridge for its scenic spot function,with no aerodynamic instabilities like vortex-induced vibration or flutter.After changing the aerodynamic shape,there is a noticeable increase in both lateral and vertical static-wind displacement responses,with a certain difference between the two in the torsional direction,whereas no clear pattern emerges.The change in the aerodynamic shape of the bridge,designed around a scenic spot,results in a decreased vertical buffeting response,while the lateral and torsional buffeting responses show a significant increase.After calculation,the structural comfort meets design requirements.
作者
敬大德
苏益
JING Dade;SU Yi(Lhasa Municipality Design Group Co.,Ltd.,Lhasa,Xizang 850000,China;Wind Engineering Key Laboratory of Sichuan Province,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《中外公路》
2024年第1期119-125,共7页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:52008357)。
关键词
桥梁结构
抗风性能
静风位移响应
抖振响应
舒适度
bridge structure
wind resistance performance
static wind displacement response
buffeting response
comfort
