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Study on Wind-environment Numerical Simulation about Yellow River Diagonal Cable Bridge in Yu-Entranceon

Author: ZhangYongSheng
Tutor: HuZhaoTong
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Cable-stayed bridge Wind Environment Wind observations Numerical Wind Tunnel FLUENT Turbulence model
CLC: U442.59
Type: Master's thesis
Year: 2007
Downloads: 84
Quote: 3
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Abstract


With the continuous improvement of the technical level of the modern bridge across the major rivers and even the Strait Bridge are emerging, these long-span bridges must overcome nature wind study wind on the role of the bridge, the bridge wind engineering. Among them, the bridge of wind environment is an important part of this discipline. Focused Shanxi Yumenkou the Yellow cable-stayed bridge, its surrounding terrain wind field numerical simulation of wind load design based on the calculated result of its structural design and construction, as well as wind-resistant design of the bridge in such terrain Provides reference information. The bridge wind environment research methods including: field observations (including meteorological stations), wind tunnel tests and numerical simulation (the numeric wind tunnel). The first two methods for the physical means test cycle is long, and spend a lot of manpower and material resources. Numerical wind tunnel \the test is insufficient. \In this paper, using a numerical simulation method of observation combined with on-site wind characteristics, bit wind environment Research Yumenkou Cable Stayed Bridge. Calculated the analysis software FLUENT6.2 comes with large commercial fluid grid generation software GAMBIT2.1 build the bridge located at the terrain and the cable-stayed bridge 3D geometric model debugging grid and determine the calculation of the watershed, the appropriate choice of boundary conditions and solution parameters and written the UDF procedures, selection of improved Realizableκ-ε turbulence model. In addition, in order to explore a more reasonable turbulence model with SSTκ-ω model analysis of the two conditions. Given wind flow chart, wind vector, wind speed and turbulence maps of the deck at the height of the main beam surface wind velocity vector and pressure contour diagram, and finally the numerical simulation of the bridge is located in the wind field characteristics and wind observations statistical results comparative analysis. The conclusions reasonable explanation the mountain plains wind profile of the combination at the bridge site sometimes does not meet the exponential distribution law, comparing the surface category Yumenkou bridge location belongs, gives the cable-stayed bridge the tower column with deck The wind velocity vector maps proved Realizableκ-ε turbulence model can reasonably simulate such wind environment, SSTκ-ω turbulence model is not suitable for the simulation of such wind environment. Self UDF program beyond the laboratory numerical wind tunnel \

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CLC: > Transportation > Road transport > Bridges and Culverts > Investigation, design and calculation > Bridge Design > Of nature external force on the bridge design
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