Investigation and control of vortex-induced vibration of twin box girders

2013 ◽  
Vol 39 ◽  
pp. 205-221 ◽  
Author(s):  
Shujin Laima ◽  
Hui Li ◽  
Wenli Chen ◽  
Fengchen Li
Keyword(s):  
Box Girders ◽  
Vortex Induced Vibration ◽  
And Control

scholarly journals Numerical and Experimental Research on the Effect of Platform Heave Motion on Vortex-Induced Vibration of Deep Sea Top-Tensioned Riser

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jie Zhang ◽  
Ying Zeng ◽  
Yougang Tang ◽  
Wenyun Guo ◽  
Zhenkui Wang
Keyword(s):  
Parametric Excitation ◽  
Deep Sea ◽  
Frequency Component ◽  
Vortex Induced Vibration ◽  
Wake Oscillator ◽  
Validation Experiment ◽  
Simulation And Experiment ◽  
Prediction And Control ◽  
Heave Motion ◽  
And Control

The prediction and control of vortex-induced vibration (VIV) is one of the key problems for riser design. The effect of platform heave motion on VIV of deep sea top-tensioned riser (TTR) is presented by means of numerical simulation and experiment in this research. First, the heave motion was modeled as a parametric excitation, and the governing equation of VIV of riser considering the parametric excitation was established. Then, the dynamic response of TTR was calculated numerically by the finite difference method based on the Van der Pol wake-oscillator model. Finally, a validation experiment was carried out at the towing tank of Tianjin university. The results show that the VIV response at the bottom of riser is significantly increased due to the platform heave motion, especially in the situation of low current velocity. The larger amplitude and the higher frequency of the platform heave motion with the greater influence are generated on VIV of TTR. In particular, the value of 0.5 times, 1 time, or other multiples of the platform heave frequency will be included in the vibration frequency component of TTR when the platform heave amplitude is large and the frequency is high.

Investigation of vortex-induced vibration of a suspension bridge with two separated steel box girders based on field measurements

2011 ◽  
Vol 33 (6) ◽  
pp. 1894-1907 ◽  
Author(s):  
Hui Li ◽  
Shujin Laima ◽  
Jinping Ou ◽  
Xuefeng Zhao ◽  
Wensong Zhou ◽  
...  
Keyword(s):  
Field Measurements ◽  
Suspension Bridge ◽  
Box Girders ◽  
Vortex Induced Vibration

Numerical Analysis of Fluid-Structure Interaction of Frame Structure Considering the Impact of Turbulent Wind Load

2011 ◽  
Vol 94-96 ◽  
pp. 2130-2133
Author(s):  
Wen Bin Sun
Keyword(s):  
Flow Field ◽  
Cfd Simulation ◽  
Coupling Effect ◽  
Frame Structure ◽  
Vortex Induced Vibration ◽  
Vibration Effect ◽  
Control Principle ◽  
And Control ◽  
Wind Induced Vibration ◽  
The Impact

According to the basic principle of CFD simulation and methods, a framework structure was studied for its vortex-induced vibration and control principle of around the flow field, it revealed the characteristics of vortex-induced vibration and rules, systematically studied frame structure fluid-solid coupling effect and the flow field active control methods and mechanism. Results provide the theory basis for the frame structure around the flow field and the wind induced vibration effect.

scholarly journals Investigation and Control of VIVs with Multi-Lock-in Regions on Wide Flat Box Girders

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Bo Wu ◽  
Liangliang Zhang ◽  
Yang Yang ◽  
Lianjie Liu ◽  
Haohong Li
Keyword(s):  
Slenderness Ratio ◽  
Ventilation Rate ◽  
Control Mechanisms ◽  
Box Girders ◽  
Eddy Simulation ◽  
Vortex Induced Vibrations ◽  
Control Schemes ◽  
Large Eddy ◽  
Lock In ◽  
And Control

On the preliminary designing of a wide flat box girder with the slenderness ratio 12, vertical and torsional vortex-induced vibrations (VIV) are observed in wind tunnel tests. More than one lock-in region, which are defined as“multi-lock-in regions,”are recorded. Therefore, suspicions should be aroused regarding the viewpoint that wide box girders are aerodynamic friendly. As the three nascent vortexes originating at the pedestrian guardrails and inspection rails shed to near-wake through different pathways with different frequencies, the mechanisms of VIVs and multi-lock-in regions are analyzed to be determined by the inappropriate subsidiary structures. A hybrid method combiningLarge Eddy Simulation(LES) with experimental results is introduced to study the flow-structure interactions (FSI) when undergoing VIVs; the vortex mode of torsional VIV on wide flat box girders is defined as “4/2S,” which is different from any other known ones. Based on the mechanism of VIV, a new approach by increasing ventilation rate of the pedestrian guardrails is proved to be effective in suppressing vertical and torsional VIVs, and it is more feasible than other control schemes. Then, the control mechanisms are deeper investigated by analyzing the evolution of vortex mode and FSI using Hybrid-LES method.

Investigation and Control of Cracks in Wet Joint of Concrete Box Girders

2021 ◽  
Vol 35 (6) ◽  
pp. 04021076
Author(s):  
Haibo Zhu ◽  
Yang Zhao ◽  
Xue Luo ◽  
Rongqiao Xu
Keyword(s):  
Box Girders ◽  
And Control

Vortex Induced Vibration Analysis of Twin Box Girders by Means of Computational Fluid Dynamics

2014 ◽  
Vol 638-640 ◽  
pp. 1012-1017
Author(s):  
Qing Liang Zhan ◽  
Zhi Yong Zhou ◽  
Ting Yang ◽  
Yao Jun Ge
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Time History ◽  
Box Girders ◽  
Vibration Displacement ◽  
Vortex Induced Vibration ◽  
Eddy Simulation ◽  
Cfd Models ◽  
History Of ◽  
Lock In

This paper analyzes the vortex induced vibration (VIV) phenomena of twin box bridge girders by means of 2D computational fluid dynamics (CFD) models. The modeling of turbulence follows a methodology known as large eddy simulation (LES) in which the large scales of turbulence are resolved, while the small ones are modeled by means of sub-grid-models. The dynamic response of structure in relation to the fluid is solved by embedding the code of Newmark-β method in user defined functions of Fluent. The time history of girder’s vibration displacement is obtained successfully, which agrees well with the experiment results of wind tunnel tests. “Lock-in”, “beat” phenomena and the displacement “detuning” phenomena in the locked field are also gained.

scholarly journals Study on the Effect and Mechanism of Aerodynamic Measures for the Vortex-Induced Vibration of Separate Pairs of Box Girders in Cable-Stayed Bridges

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Han Xin He ◽  
Jia Wu Li
Keyword(s):  
Experimental Result ◽  
Box Girders ◽  
Vortex Induced Vibration ◽  
Optimum Angle ◽  
Low Wind Speed ◽  
Catastrophic Failures ◽  
Opening Ratio ◽  
Ratio Set ◽  
Inclined Angle ◽  
Cable Stayed Bridges

Although not always resulting in catastrophic failures, vortex-induced vibration (VIV) response can seriously impact the fatigue life and functionality of bridges, especially for separate pairs of box girders in cable-stayed bridges. This study investigates the effects of three aerodynamic measures: grating, inclined web plate, and the baffles on separated box girders in the cable-stayed bridges. The experimental result indicates that the grating of different opening ratios can control the vortex-induced vibration effectively, and the optimized grating opening ratio set in this paper is 40%. Increasing the angle of inclined web plate has a great control on mitigation of the vortex-induced vibration. However, there is an optimum angle where the amplitude of vortex-induced vibration is the smallest at low wind speed. The amplitude of vortex-induced vibration becomes larger with the increase of the web inclined angle that exceeds the optimum angle. Comparatively, the baffles installed on both sides of the inclined webs are more effective to restrain the vortex-induced resonance. The Computational Fluent Dynamics (CFD) software is utilized to investigate the mechanism of the experimental results.

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.

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