主缆刚度分布和矢跨比对多缆悬索桥结构动力特性和飘移性能的影响及机理

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2024-10-16 DOI:10.1016/j.jweia.2024.105919

Yunliang Shi, Yongxin Yang, Jinbo Zhu, Jinjie Zhang

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引用次数: 0

摘要

通过加入额外的承载主缆，多缆悬索桥在调整结构动态特性方面提供了更大的灵活性，并为解决大跨度桥梁的飘移失稳问题提供了新的可能方案。本文以多索悬索桥为基础，对比双索悬索桥，对其动态特性进行了深入研究。此外，还研究了主缆刚度分布和矢跨比对动态特性的影响。结果表明，由于主缆的作用不同，多缆悬索桥具有各种扭转模式，加劲梁的振动形状相似，这与双缆悬索桥截然不同。主缆刚度分布的变化对这些扭转模态的形式也有显著影响。在此基础上，采用模态驱动法研究了多索悬索桥的扑动性能。结果表明，扑翼临界风速随内外主缆的矢跨比和刚度比的增大而增大，多索悬索桥比具有适当刚度分布的双索悬索桥能获得更好的扑翼性能。刚度分布和矢跨比的变化可能会导致扑翼主导模式的转变。

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Effect and mechanism of stiffness distribution and sag-span ratio of main cables on structural dynamic characteristics and flutter performance of multi-cable suspension bridges

By incorporating extra load-carrying main cables, multi-cable suspension bridges provide increased flexibility in adjusting structural dynamic characteristics, and new possible solutions to the flutter instability problem of long-span bridges. Based on a multi-cable suspension bridge, this paper presents a particular insight into the dynamic characteristics which was contrast with double-cable suspension bridge. Furthermore, the influence of stiffness distribution and sag-span ratio of main cables on the dynamic characteristics was also studied. It is shown that due to the different contribution of the main cables, multi-cable suspension bridge has various torsional modes with similar vibration shapes of the stiffening girder, which is quite different from double-cable suspension bridge. Changes in stiffness distribution of main cables also have significant effects on the form of these torsional modes. On this basis, the flutter performance of multi-cable suspension bridge is studied by modality-driven method. The results indicate that the flutter critical wind speed increases with the increase of sag-span ratio and stiffness ratio of inner and outer main cables, and multi-cable suspension bridge can obtain better flutter performance than double-cable suspension bridge with appropriate stiffness distribution. The change of stiffness distribution and sag-span ratio may lead to the transition of flutter dominant mode.

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.