半刚性模型风洞试验荷载谱的处理方法_邹良浩.pdf

21 3 Vol. 21, No. 3 2007 09 Journal of Experiments in Fluid Mechanics Sep . , 2007 : 1672- 9897( 2007) 03- 0076- 06 邹良浩, 梁枢果 ( , 430072) : , , , , , , , , , , , : ; ; ; : TU312 : A A method to evaluate wind force spectra of sem-i rigid model in wind tunnel tests ZOU Liang-hao, L ANG Shu-guo ( School of Civil and Building Engineering, Wuhan University, Wuhan 430072, China) Abstract:The model of high-frequency-force-balance must be light and rigid enough. However, it is very difficult to make this kind of light and rigid models for some special structures such as lattice towers because of the complexity of the structures themselves . For sem-i rigid models of the special structures, the fundamental frequencies in the directions of the principal axes of the models are st ill in or near the frequency range of wind load spectra. n order to clear contaminations to the wind load spectra induced by model resonance, special formulae were deduced to treat the data obtained from high-frequency-force-balance tests of sem-i rigid latt ice tower models in light of structure dynamics and random vibration theory, and the generalized force spectra of the first mode of latt ice towers in along-wind, across-wind and torsional directions are obt ained. Key words: lattice tower; high-frequency-force-balance; dynamic wind loads; semi-rigid model , 0 [ 2] ( HFFB) 30 , ,