|Table of Contents|

Study on Flow Field Characteristics Around Separated Twin-box Girder Based on Surface Wind Pressure Analysis(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年02期
Page:
69-78
Research Field:
Publishing date:

Info

Title:
Study on Flow Field Characteristics Around Separated Twin-box Girder Based on Surface Wind Pressure Analysis
Author(s):
LI Jia-wu;  ZHU Chang-yu
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
Keywords:
separated twin-box girder;  vortex vibration;  wind tunnel test;  wind pressure characteristic;  synchronal measurement of pressure and vibration
PACS:
TU311
DOI:
10.19815/j.jace.2020.09081
Abstract:
In order to study the flow field characteristics of separated twin-box girder, a cable-stayed bridge with separated twin-box girder cross-section was taken as the research object, the surface wind pressure of the separated twin-box girder under different states was obtained by the method of segmental model vibration measurement and pressure test. Through the analysis of the wind pressure, the main frequency distribution of the wind pressure fluctuation and the average wind pressure coefficient distribution under different states were obtained. In the vibration state, the change of the main frequency distribution region of the surface wind pressure fluctuation of the separated twin-box girder model was summarized in the torsional vortex vibration locking region and beyond the torsional vortex vibration locking region, and it was compared with the vibration measurement test of separated twin-box girder segment model. In the locking region of torsional vortex vibration, the variation trend of average wind pressure coefficient on the surface of separated twin-box girder model was compared. The regional variation range of the main frequency of pressure fluctuation equal to the torsional fundamental frequency of the separated twin-box girder model was summarized at the rising stage, the maximum stage and the falling stage of torsional vortex amplitude. The distribution of average wind pressure coefficient of separated twin-box girder under different states was compared. The results show that the vortex shedding on the inner side of the gap is a necessary condition for torsional vortex vibration. The variation law of the average wind pressure coefficient of the separated twin-box girder is consistent under different wind speeds in the vortex vibration locking region. The area where the main frequency of surface wind pressure is the same as the torsional fundamental frequency decreases with the increase of wind speed. The average wind pressure coefficient of the upper and lower surface of the separated twin-box girder is less affected by the motion state.

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Last Update: 2021-03-20