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Equipment of Wind Resistant Test on Long-Span and Wind Resistant Method Through Air-Suction on the Slab

Author: ZhangMingJing
Tutor: FengJiang
School: Northeast Agricultural University
Course: Mechanical Design and Theory
Keywords: Span bridges Wind resistance equipment Wind tunnel test Constant suction Numerical Simulation
CLC: U446.1
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
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Abstract


The bridge is an important transportation infrastructure, with the development of civil engineering science and technology and lightweight high-strength materials, the bridge span is increasing, but the stiffness and damping of the bridge to reduce the sensitivity of the bridge structure under wind loads gradually increased wind loads and wind-induced stability to become one of the controlling factors that affect the safety of the bridge structure. Therefore, to improve the long-span bridges wind resistance is particularly important. Mainly three types: mechanical measures, aerodynamic measures and structural measures, measures to improve the wind resistance of the bridge structure. Mechanical measures are based on the bridge structure in response to the control of wind-resistant measures, aerodynamic measures and structural measures are based on the bridge structure flow around a cross section of wind farm control measures, compared with mechanical measures, aerodynamic measures and structural measures direct role in The bridge structural section flow around a wind farm, the more direct the flow field of quality, to improve the cross-section of the bridge structure to improve the wind resistance of the bridge. This intuitive and effective wind tunnel tests based bridge structural section flow field around the study of the control of wind technology is usually carried At the same time, with the rapid development of computational fluid dynamics, numerical simulation study bridge structure wind caused characteristics of flow around a common means. First of all, according to the wind-induced bridge structure the role of test requirements for the traditional wind resistance test equipment coupled problem, this paper designed decouple bridge static and dynamic test system, and the bridge section model of Static identify flutter derivatives and vortex-induced vibration tests, to obtain a good test. Second, the low for the wind farm test system density and accuracy this problem, this paper three-dimensional positioning device designed wind field testing, the device can carry out a multi-point high-precision sensing devices installed. Finally, the constant suction method Tablet wind-induced static numerical methods based on Computational Fluid Dynamics (CFD). Study chosen as the model of a tablet in a uniform flow wind farm, set steady suction inlet flow near the plate end, the calculation of the flat-panel model of wind caused by changing the coefficient of steady suction and suction mode of Static thus obtain steady inhale Tablet wind-induced static role. Numerical Simulation of the wind field Reynolds Stress equation Model (RSM) turbulence model. The calculation results show that the suction effect of the steady, the drag coefficient of the plate was significantly reduced, the torque coefficient increases, tablet windward end face of the pressure increases with the enhancement of intake of energy decreases, the leeward end face of the pressure substantially constant. Numerical results show that: steady suction can effectively improve the flat plate boundary layer structure, reduce the flow around the wind-induced resistance.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge test observations with the test > Bridge test equipment
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