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Experimental analysis of additional aerodynamic effects caused by wind-driven rain on bridge main girder

Journal of Central South University 2022年第8期29卷 2743-2756页

作者： LEI Xu SHEN Lian CHEN Zheng-qing NIU Hua-wei WEI Cheng-long ZHANG Xue-wen School of Civil Engineering Changsha UniversityChangsha 410022China Wind Engineering Research Center Hunan UniversityChangsha 410082China

To study the additional aerodynamic effect on a bridge girder under the action of wind-driven rain, the rainfall similarity considering raindrop impact and surface water is first given. Then, the dynamic characteristics and the process of vortex and flutter generation of the segment models under different rain intensities and angles of attack are tested by considering several typical main girder sections as examples. The test results indicate that the start and end wind speeds,interval length and number of vortex vibrations remain unchanged when it is raining, rainfall will reduce the windinduced vortex response. When test rain intensity is large, the decrease of amplitude is obvious. However, after considering the rain intensity similarity in this study, all of actual maximum rain intensities after conversion approach the domestic extreme rain intensity of approximately 709 mm/h. It can be observed that rainfall has a limited influence on the dynamic characteristics of the structure and vortex vibration response. When the test rain intensity is 120 mm/h, the critical wind speed of the model flutter increases by 20%-30%. However, after considering the rain intensity similarity ratio, the influence of rainfall on the wind-induced flutter instability of the bridge girder may be ignored.

关键词： bridge engineering main girder wind-driven rain similarity law aerodynamic effect

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OPTIMAL DESIGN OF main girder OF LARGE PRESSING MACHINE BASED ON FATHER-OFFSPRING COMBINED SELECTION GA

OPTIMAL DESIGN OF MAIN GIRDER OF LARGE PRESSING MACHINE BASE...

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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： CAI Lanrong, HU Dejin, JIA Yan School of mechanical and power engineering, Shanghai Jiaotong University, Shanghai 200030, China

main girder is one of the most important forced parts of large pressing machine. Its optimal design is a complex real world engineering optimization problem with a series of design constraints .Classi

关键词： main girder father-offspring combined selection genetic algorithm optimal design.

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