Full Aeroelastic Model Testing for Examining Wind-Induced Vibration of a 5,000 m Spanned Suspension Bridge

Frontiers in Built Environment

Zhao, Lin¹  Xia, Jinlin²  Ge, Yaojun²  Zhao, Shiyu² 

[1] Boundary Layer Wind Tunnel Laboratory, Faculty of Engineering, University of Western Ontario, Canada;State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, China

关键词: Suspension bridge;    Full aeroelastic model;    Wind tunnel test;    flutter;    Buffeting;   

DOI  :  10.3389/fbuil.2018.00020

学科分类：建筑学

来源: Frontiers

【 摘 要 】

This paper presents an experimental investigation on wind-induced vibrations of a suspension bridge with ultimate main span length, including flutter and buffeting. Since the upper limit of a suspension bridge’s main span can reach more than 5,000m based on strength and weight of steel main cables, a feasible prototype with a span arrangement of 2,000m+5,000m +2,000m has been proposed. In order to improve flutter stability, a twin box girder has been designed with a 40m slot in center and two 20m wide decks suspended by four main cables. Its full aeroelastic model was designed and manufactured with the geometrical scale of 1:620, and the wind tunnel testing was carried out under smooth flows and turbulent flows for different angles of attack. A big difference in critical flutter speed was found between the proposed slotted girder and corresponding slot-sealed girder, which verifies the necessity of a widely-slotted twin box girder for a super-long suspension bridge. Among three angles of attack, the critical flutter speed under smooth flow has the maximum value of 80.9 m/s at -3° and the minimum value of 51.4m/s at 3°. On-coming turbulence will not only cause buffeting responses but also influence the critical flutter speed in an unfavorable way.

【 授权许可】

CC BY