Experiment study of vortex-induced vibrations of a separated twin-box girder with large cantilever plate

In order to understand the mechanical characteristics of shenqiu Zhidian Bridge considering the influence of pavement, On the basis of installing steel mesh in rigid bridge or consecution to enhance the bonding performance between the pavement and girder, the load test is conducted. According to the test result and the calculations result the bearing capacity and work performance of bridge are evaluated. The results show that in the design of bridge, by enhancing the bonding performance between the pavement and girder, considering the overlaid pavement participating in force corresponds with the actual stress structure.

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Investigation on suppressing vortex-induced vibrations of the rectangular steel box girder for railway cable-stayed bridges by installing wind fairings

Journal of Wind Engineering and Industrial Aerodynamics ◽

10.1016/j.jweia.2021.104821 ◽

2021 ◽

Vol 219 ◽

pp. 104821

Author(s):

Jiahui Dong ◽

Lin Huang ◽

Haili Liao ◽

Qi Wang

Keyword(s):

Box Girder ◽

Steel Box Girder ◽

Vortex Induced Vibrations ◽

Cable Stayed Bridges

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Analysis and Study on Bending Vibration Frequency of New Corrugated Steel Web Composite Box Girder

Advances in Civil Engineering ◽

10.1155/2021/3091480 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Xiaomeng Zang ◽

Genhui Wang ◽

Zichen Zhang

Keyword(s):

Vibration Frequency ◽

Great Influence ◽

Vertical Vibration ◽

Cantilever Plate ◽

Shear Lag ◽

Bending Vibration ◽

Box Girder ◽

Plate Length ◽

Composite Bridge ◽

Corrugated Steel Web

In order to accurately analyze the bending vibration frequency of the new composite box girder, the effects of web folding effect, shear lag, and shear deformation are comprehensively considered in this paper, and the elastic control differential equation and natural boundary conditions of the composite box girder are established by using the Hamilton principle. A one-span composite box girder with corrugated steel webs is used as a numerical example. The effects of height span ratio, width span ratio, web thickness, cantilever plate length, and fold effect on the vertical vibration frequency of the new composite box girder are analyzed. The results show that the analytical solution is in good agreement with the finite element solution. When considering the shear lag and fold effect, the vibration frequency of composite box girder decreases. With the increase in order, the influence of shear lag and fold effect on its frequency becomes stronger. The changes of height span ratio and web thickness of composite box girder have a great influence on its folding effect, while the changes of width span ratio and cantilever plate length have little influence on it. The conclusion can provide a reference for the design of medium section new composite bridge in practical engineering.

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