大跨度人行悬索桥气动稳定性能风洞试验研究
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长沙理工大学土木与环境工程学院

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U441.3; U448.11

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国家自然科学基金项目(面上项目,重点项目,重大项目),湖南省自然科学基金项目,湖南省研究生科研创新项目,长沙理工大学“实践创新与创业能力提升计划”项目


Experimental Study on the Aerodynamic Stability of Long-Span Pedestrian Suspension Bridges in Wind Tunnel
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan),Natural Science Foundation of Hunan Province,Postgraduate Scientific Research Innovation Project of Hunan Province,“Practice Innovation and Entrepreneurship Enhancement Program” of Changsha University of Science & Technology.

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    摘要:

    大跨度人行悬索桥刚度小、阻尼低,结构轻柔,在复杂风环境下易发生风致振动,影响行人舒适性与结构安全。目前针对其气动稳定性的系统性研究仍显不足。为探究气动特性及影响因素,本文依托某景区在建工程开展风洞试验,测试了一阶正对称与反对称模态下的气动响应。结果表明,该桥在0°、±3°及+5°攻角下均存在严重的颤振失稳问题。为改善气动性能,提出并验证了三种优化措施:设置稳定板、调整护栏透风率及二者组合。结果显示,单独设置稳定板或非常规封闭护栏仅能在部分攻角下提高颤振临界风速,而在相反攻角下反而降低,具有互补特性。进一步研究发现,合理组合两者可显著提升气动稳定性。最终确定两种优化方案:在2#、6#纵梁下布置两道1.5cm稳定板配合7mm井字形护栏,及布置两道2cm稳定板配合7mm星字形护栏,均能同时满足颤振与涡振稳定性要求。

    Abstract:

    Long-span pedestrian suspension bridges generally exhibit low stiffness, small damping, and lightweight structural characteristics, making them susceptible to wind-induced vibrations that affect pedestrian comfort and structural safety. However, systematic studies on their aerodynamic stability remain limited. To investigate the aerodynamic characteristics and influencing factors, wind tunnel tests were conducted based on a pedestrian suspension bridge under construction in a mountainous scenic area. The aerodynamic responses corresponding to the first symmetric and antisymmetric modes were measured. Results indicate that the bridge shows insufficient flutter stability at attack angles of 0°, ±3°, and +5°. To improve aerodynamic performance, three optimization measures were proposed and validated: installation of stabilizer plates, adjustment of railing porosity, and a combination of both. The tests show that either stabilizer plates or unconventional enclosed railings alone can improve the critical flutter wind speed at specific attack angles but may reduce it at opposite angles, indicating complementary aerodynamic effects. Further analysis revealed that their proper combination significantly enhances aerodynamic stability. Two optimized configurations were determined: (1) two 1.5 cm stabilizer plates installed below girders #2 and #6 with 7 mm grid-pattern railings, and (2) two 2 cm stabilizer plates with 7 mm star-pattern railings. Both configurations satisfy the stability requirements for flutter and vortex-induced vibration.

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  • 收稿日期:2025-11-03
  • 最后修改日期:2025-12-21
  • 录用日期:2025-12-24
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