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Wind tunnel experimental on influence of railing ventilation rate oncharacteristics of vortexinduced vibration of main girder(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年03期
Page:
71-79
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Wind tunnel experimental on influence of railing ventilation rate oncharacteristics of vortexinduced vibration of main girder
Author(s):
CUI Xin1; 2;  WANG Huixian1;  GUAN Qinghai2;  LIU Jianxin2
（1. School of Civil Engineering and Communication, North China University of Water Resources and ElectricPower, Zhengzhou 450011, Henan, China; 2. School of Highway, Changan University,Xian 710064, Shaanxi, China）
Keywords:
bridge engineering;  vortexinduced vibration;  wind tunnel experiment;  aerodynamic measurement
PACS:
-
DOI:
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Abstract:
To study the influence of railing ventilation rate on characteristics of vortexinduced vibration of main girder in boxshaped steel, ventilation rate of outside railing with different sealing strategies on railings were changed， and manometric holes were arranged on the surface of model, the vibration measurement and manometric method in the wind tunnel experiment were conducted. The railings were sealed in two ways, in the onesealed threeopen plan(a sealed segment was arranged between every three open segments) and in the onesealed twoopen plan (a sealed segment was arranged between every two open segments), the ventilation rate of two ways were reduced by 25% and 33%, respectively, compared to the original plan. The relationship of the air speed on the section of main girder and its amplitude were measured based on the different vibration rates, and the change history of the average pressure coefficient, the pulsating pressure coefficient, and the power spectral density were analyzed on the tested holes which located on the surface of model. The results show that the reduce of railing vibration rate could restrain the vortexinduced vibration of the main girder effectively, and with different operating conditions, pressure coefficient distributes coherently on the surface of the main girder, the only difference caused by changing choke proportion lies on numerical values. Compared with the original plan, there are significant differences in railing sealing plan on distribution and values of pulsating pressure coefficient. The vortexshed frequency on the majority of tested points concentrates on vertical bending and torsional frequency of the model, and the energy is larger, in the original plan, while there is only a small part of the vortexshed frequency concentrates on he vertical bending and torsional frequency and the energy is small in the railing sealing plan, thus the reduce of railing ventilation rate changes the turbulent flow of air, effectively distributes the concentration of energy on the vertical bending and torsional frequency, therefore undoes the dramatic vibration of the framework. There is a susceptible threshold of vortexinduced vibration on railing ventilation rate, and while the railing ventilation rate reduce by 25% is the susceptible threshold which influences this bridges vertical bending vortexinduced vibration. 1 tab, 13 figs, 24 figs.

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Last Update: 2018-06-13