Vortex‐induced vibration measurement of a long‐span suspension bridge through noncontact sensing strategies

2021 ◽  
Author(s):  
Jian Zhang ◽  
Liming Zhou ◽  
Yongding Tian ◽  
Shanshan Yu ◽  
Wenju Zhao ◽  
...  
Keyword(s):  
Suspension Bridge ◽  
Vibration Measurement ◽  
Vortex Induced Vibration ◽  
Long Span

Wind Tunnel Studyon Vortex-Induced Vibration Characteristics of Long-Span Suspension Bridges with Single Cable Plane

2014 ◽  
Vol 633-634 ◽  
pp. 1263-1266
Author(s):  
Huang Yu
Keyword(s):  
Wind Tunnel ◽  
Suspension Bridge ◽  
Wind Tunnel Experiment ◽  
Vibration Characteristics ◽  
Torsional Stiffness ◽  
Suspension Bridges ◽  
Vortex Induced Vibration ◽  
Long Span Bridges ◽  
Wind Speeds ◽  
Long Span

For modern long-span bridges, both the optimization of aerodynamic shape and the increase of torsional stiffness according to the result of the wind tunnel experiment could avoid the flutter instability.Vortex-inducedvibration with relatively large amplitude happens easily at low wind speeds. In this paper, based on wind tunnel experiment, by studying on the vortex-induced vibration characteristics of a long-span suspension bridge with single cable plane, aerodynamic measures for easing the vortex-induced vibration are given.

Experimental and numerical study on vortex-induced vibration of a truss girder with two decks

2020 ◽  
pp. 136943322096902
Author(s):  
Chen Fang ◽  
Ruijie Hu ◽  
Haojun Tang ◽  
Yongle Li ◽  
Zewen Wang
Keyword(s):  
Large Scale ◽  
Numerical Study ◽  
Suspension Bridge ◽  
Wake Flow ◽  
Box Girders ◽  
Vortex Induced Vibration ◽  
Long Span Bridges ◽  
Wind Speeds ◽  
Long Span ◽  
Lock In

Vortex-induced vibration (VIV) depends on aerodynamic shapes of bridge girders, which should be treated carefully in the design of long-span bridges. This paper studies the VIV performance of a suspension bridge with the truss girder which contains two separated decks. Although truss girders generally show better VIV performance than box girders, significant vibrations of this type of girders occurred in the wind tunnel tests based on a large-scale sectional model. Several lock-in regions with the same vibration frequency were observed, corresponding to different shedding vortices. Computational fluid dynamics (CFD) simulations were carried out, and monitoring points were set behind different components to study the characteristics of the shed vortices. As the truss girder consists of many members, the results show that various vortices with different dominant frequencies are formed in the wake flow. The vertical VIV of the bridge is probably driven by the vortices behind or above the upper deck, which is related to the guardrails. The torsional VIV of the bridge is probably driven by the vortices behind or below the lower deck, which is related to the service road at lower wind speeds while may be related the vertical stabilizers at higher wind speeds.

Experimental Study on Suppression of Vortex-Induced Vibration of Central-Slotted Box Girder by Aerodynamic Countermeasures

2014 ◽  
Vol 638-640 ◽  
pp. 1067-1078
Author(s):  
Ting Yang ◽  
Zhi Yong Zhou
Keyword(s):  
Wind Tunnel ◽  
Large Scale ◽  
Vibration Measurement ◽  
Test Results ◽  
Box Girders ◽  
Vortex Induced Vibration ◽  
Wind Tunnel Tests ◽  
Long Span ◽  
Bridge Model ◽  
Sectional Model

To study the mechanism on the vortex resonance characteristics of the central-slotted box girders, the large-scale sectional model vibration measurement and pressure measurement are employed. This paper takes a long-span cable-stayed bridge over the Yangtze River as an example to conduct the wind tunnel tests of large-scale sectional model. The test results indicate that it is the inside maintenance rails located in the aerodynamic susceptible sites that cause the vortex-induced vibration (VIV) of bridge model. Accordingly, the inside maintenance rails are proposed to be moved towards the central axis by a certain distance. The static pressure test results show that when shifting the inside maintenance rails, the negative mean pressure at the soffit plate knuckle line will not change dramatically, the fluctuating pressures on the upwind and downwind inclined panels can be reduced, and the fluctuating energy will be dispersed without a consistent predominant frequency. Wind tunnel tests of modified section are conducted and the results show that the VIV of bridge model can be suppressed completely due to the shift of inside rails.

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