Full-scale Measurement And Wind-tunnel Based Wind Effects On Open Membrane Structures

Membrane structure are widely applied to low rise structures in recent years. These structures belong to low rise buildings with high turbulence at the height of roof. Wind-resistant design is very important for these structures because membrane structures are flexible and sensitive to wind effects with low natural frequency. It is difficulty to accurately estimate the wind effects due to many uncertainties, of structures and wind.Wind effects are monitoried for a membrane structure. On the basis of these results, modal parameters are identified and FE model is updated. Meanwhile, wind induced responses are investigated and compared to the response based on updated FE model and wind tunnel test. The main works of this paper are shown as follows:(1) Two methods of modal parameter identification, including HHT and Wavelet-transform are summarized and examined to identify modal parameters for those structures with dense frequency distribution.(2) A monitoring system is set up. During the monitoring, characteristics of wind-induced response are analysized. Modal parameters of the structure are identified using dynamic responses. Amplitude-dependent damping ratios are identified and results show that there is an increasing trend of damping ratios with the increase of vibration amplitude.(3) The FE model of the membrane based on ANSYS is set up. On the basis of modal parameter identification, FE model is updated and wind effects with the updated model under different wind directions are investigated, where wind loads are obtained by wind tunnel test. Responses comparisons between FE numerical and full-scale measurements are investigated and corresponding reasons which cause the difference are discussed.