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《Engineering Mechanics》 2017-12
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YU Xian-feng;XIE Zhuang-ning;LIU Mu-guang;LIU Hai-ming;State Key Laboratory of Subtropical Building Science, South China University of Technology;State Key Laboratory of Bridge Engineering Structural Dynamics,China Merchants Chongqing Communication Research & Design Institute Co., Ltd.;  
External pressures on the surfaces of principal building were obtained by a series of wind tunnel tests on rigid models. Acceleration responses of the principal building were calculated at different reduced velocities. Envelope interference factor(E_(IF)) distribution and vortex-induced vibration mechanism of the along-wind peak acceleration were detailed studied in different breadth ratios B_r(B_r=B_i/B_p) and height ratios H_r(H_r=H_i/H_p). Furthermore, correlation analyses were carried out for the envelope interference factors E_(IF) in different breadth ratios B_r and height ratios H_r. Results show that the maximum values of E_(IF) are 2.3 and 2.06 when B_r equals 0.4 and 0.6 respectively, because of the influence of vortex-induced vibration. In wind resistant design process, the amplification effect of along-wind acceleration should be paid more attention when B_r is small. In non-resonance cases, the remarkable amplification region becomes larger with the increase of B_r, and the corresponding maximum values of E_(IF) also gradually increase. Correlation coefficient of E_(IF) between H_r =1.2 and 1.0 is up to 91%, and the distribution of. E_(IF) nearly keeps unchanged when H_r ≥1.2.
【Fund】: 国家自然科学基金项目(51408227);; 中央高校基本科研业务费专项项目(2015ZM001)
【CateGory Index】: TU973.213
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