大跨度自锚式悬索桥半封闭箱型加劲梁抗风性能试验研究
Experimental Study on Wind Resistance Performance of Semi-closed Box Girder of Long-span Self-anchored Suspension Bridge
陈逸群1
作者信息
- 1. 上海市政工程设计研究总院(集团)有限公司,上海 200092
- 折叠
摘要
文章以一拟建大跨度自锚式悬索桥为工程背景,通过ANSYS有限元分析和节段模型风洞试验,研究了半封闭箱型钢-UHPC组合加劲梁的抗风性能.研究结果表明,半封闭箱型钢-UHPC组合加劲梁在-3°、0°及 3°风攻角下,颤振临界风速均大幅高于颤振检验风速,颤振稳定性满足规范要求,且安全储备较大.加劲梁在 5°、3°和-3°风攻角下发生了超过规范允许幅值的竖向涡激共振,在 3°风攻角下发生了超过规范允许幅值的扭转涡激共振.对原加劲梁进行气动外形改良后,竖向涡激共振和扭转涡激共振均消失,同时颤振稳定性也明显改善.
Abstract
Based on a proposed long-span self-anchored suspension bridge,the wind-resistant performance of semi-enclosed steel-UHPC composite stiffening girder is studied by ANSYS finite element analysis and wind tunnel test of segmental model.The results show that the flutter critical wind speed of the semi-closed box steel-UHPC composite stiffening girder is significantly higher than the flutter test wind speed at-3°,0° and 3° wind attack angles.The flutter stability meets the requirements of the specification and the safety reserve is large.The vertical vortex-induced resonance of the stiffening girder exceeds the allowable amplitude of the specification at the wind attack angles of 5°,3° and-3°,and the torsional vortex-induced resonance exceeds the allowable amplitude of the specification at the wind attack angle of 3°.After the aerodynamic shape improvement of the original stiffening beam,the vertical vortex-induced resonance and the torsional vortex-induced resonance disappear,and the flutter stability is also significantly improved.
关键词
自锚式悬索桥/钢-UHPC组合梁/节段模型试验/加劲梁/抗风性能Key words
self-anchored suspension bridge/steel-UHPC composite beam/segmental model test/stiffening girder/wind-resistant performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据