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| Investigation on wind-induced aero-elastic responses of a monument with rhombus cross-section |
| SONG Wei-wei1, LIANG Shu-guo1, ZOU Liang-hao1,WEN Si-qing2 |
| 1.School of Civil Engineering and Architecture，Wuhan University, Wuhan 430072，China；2.Wuhan Architectural Design Institute, Wuhan 430014，China |
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Abstract Wind tunnel tests of surface pressure scanning with a rigid model and vibration measurement with a stick-like aero-elastic model of a 100-meter-high diamond-shaped cross-section monument were conducted, and then the frequency domain wind load model was established based on the pressure measurement data and the wind-induced response of the structure was calculated by the method of random vibration theory; meanwhile, the aerodynamic damping ratio were identified by applying Random Decrement Technique (RDT).When the aerodynamic damping ratios were considered in the structural complex frequency response function, the calculation results of wind-induced dynamic responses agree well with the aero-elastic model test results. As the difference between the structural actual mode shape and the linear mode shape of the stick-like aero-elastic model may cause error, mode shape correction factors were adopted to modify the aero-elastic model test results, and then acquire actual structural responses. The analysis results show that, frequency domain response analysis method of a actual high-rise structure, in which wind load model is established by the surface pressure scanning test of a rigid model, combined with the aerodynamic damping identification by the aero-elastic model vibration measurement test, can accurately assess the wind-induced aero-elastic responses of the low-frequency small-damping high-rise structures under strong wind actions.
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Received: 05 March 2013
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2014, Vol. 33 
