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Zhou Q.,State Key Laboratory for Disaster Reduction in Civil Engineering | Zhou Q.,Tongji University | Zhu L.-D.,State Key Laboratory for Disaster Reduction in Civil Engineering | Zhu L.-D.,Key Laboratory for Wind Resistance Technology of Bridges | And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

On the basis of the wind resistant performance research on the windshield barrier of Xiangshan Bay Bridge, the wind-speed reducing effects of curve windshield barrier with different porosity ratios and under different wind attack angles, are numerically simulated by the two dimensional RNG k-ε turbulence model. The result shows that: the question about the unsteady flow pass around the bluff bridge deck with curve windshield barrier can be successfully calculated by the RNG k-ε turbulence model; the wind-speed reducing effect of curve wind barrier is related with the porosity ratio, the wind attack angle and the height of the windshield barrier. Moreover, by the analysis of the wind profile at the middle of the different lanes and the wind speed reduction factor variation pattern, we can know that: the wind-speed reducing effect of windshield barrier is decreased linearly while the wind attack angle alters from minus to plus, and is more significant at the leeward lanes than that at windward lanes. Besides, with the increase of the porosity ratio, the wind-speed reducing effect dose not represent as linearly variation but trends to stable value in the certain extent of the porosity ratio, which can be used to determine the optimal porosity ratio. Source

Meng X.,Tongji University | Zhu L.,Tongji University | Zhu L.,Key Laboratory for Wind Resistance Technology of Bridges | Guo Z.,Tongji University | Guo Z.,Key Laboratory for Wind Resistance Technology of Bridges
Frontiers of Architecture and Civil Engineering in China | Year: 2011

By examining the two neighboring Haihe Bridges with semi- and full-closed bridge decks, the aerodynamic interference between the two decks on the vortex-induced vibration (VIV) and the corresponding aerodynamic mitigation measures are investigated via a series of wind tunnel tests with a spring-suspended sectional model aided with computational fluid dynamics (CFD) method. The results show that the VIV responses of both bridges can be significantly affected by the aerodynamic interference and that the extent of the influence varies with the shapes of the windward and leeward decks. The VIV amplitudes of the windward bridge are often fairly close to those of the single bridge. However, those of the leeward bridge are magnified substantially by aerodynamic interference if the same structural and aerodynamic configurations are adopted for the two bridges. Otherwise, the VIV responses are not significantly increased and may even be reduced by the aerodynamic interference if different configurations are employed for the two bridges. Furthermore, an effective combined measure of adding wind barriers and sharpening the wind fairing noses of the two box decks is presented for mitigating both the vertical and torsional VIV responses of the windward and leeward bridges. © 2011 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source

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