铁道科学与工程学报2025，Vol.22Issue(2)：757-769,13.DOI:10.19713/j.cnki.43-1423/u.T20240628
独塔部分地锚斜拉桥涡振气动抑振措施与气动影响研究
Mitigation countermeasure on VIV and its effects on aerodynamics of partial gravity-anchored cable-stayed bridge with a single tower
摘要
Abstract
In order to solve the problem of vortex-induced vibration(VIV)frequently observed in two-edged box girders with Π-shaped cross-section in cable-stayed bridge,a case study on a single-tower partially ground-anchored cable-stayed bridge of complex structure was carried out.The full bridge model was established using Ansys software,and then the sectional model was designed based on the results of dynamic characteristics analysis.Sectional model VIV tests were carried out under different wind angles of attack and wind speed,followed by studies on mitigation countermeasures on VIV and their effects on bridge girder aerodynamics.The study shows that at the code-specified damping ratio,and in the range of prevailing wind speed and among wind attack angle of±3°,the original designed girder indicated significant VIV in both vertical and torsional directions,and the vertical VIV amplitude obviously exceeded the code limit.The addition of lower baffle plates or inverted L-shaped edge plates significantly reduced the vertical bending VIV amplitude within the wind attack angle range of±3° and also slightly reduced the torsional VIV amplitude,satisfying the code requirements for bridge VIV.However,if only one aerodynamic countermeasure was applied at the wind angle of attack of 5°,the vertical and torsional VIV still exceeded the code requirement.Therefore,the application of both the lower baffle plates and the inverted L-shaped edge plate is necessary to effectively suppress VIV of the bridge.The original designed girder and the aerodynamic modified girders have sufficient flutter stability in the wind angle of attack of±3°,showing that the aerodynamic countermeasures do not affect the flutter stability of the original girder.In addition,the installation of lower baffle plates basically does not change the drag coefficient of the original girder,while the installation of the inverted L-shaped edge plates significantly reduces the drag coefficient of the original girder.The installation of inverted L-shaped edge plate obviously increases the curve slope of the lift and moment coefficients,indicating the increased vertical and torsional damping of the bridge,hence it can significantly reduce the vertical and torsional VIV and can improve the VIV performance of the bridge.The present research can not only provide design support for the VIV concern for the bridges,but also can provide guidance for the wind-resistant design of similar types of bridges.关键词
涡振/部分地锚斜拉桥/双边箱主梁/抑振措施/力系数/气动机理Key words
vortex-induced vibration/partially gravity-anchored cable-stayed bridges/two-edge box girder/vibration mitigation/force coefficients/aerodynamic mechanism分类
交通工程引用本文复制引用
祝志文,刘桂荣,沈焯悦,刘帅永,汤琴..独塔部分地锚斜拉桥涡振气动抑振措施与气动影响研究[J].铁道科学与工程学报,2025,22(2):757-769,13.基金项目
国家自然科学基金资助项目(52278509) （52278509）
