Study On Random Wind-Induced Response Of Double Layer Cylin Drical Shell

Span roof structure has a sleek, good mechanical performance.In recent years, it is widely used in all types of buildings, but the standard is only calculated for the wind vibration specification tall buildings, and no large-span roof wind vibration calculations. In this paper, a double cylindrical latticed shell as background.In theory, the shell’s wind vibration response mechanism, calculated method advance a series of studies. The main research work is as follows:1.Comparison of two methods in the frequency domain of wind-induced response. Calculate background response, resonant response, and then superimpose to obtain the results of the total response.Simpson adaptive algorithm is consistent with the method of calculating background response, resonant response. The ratio of the background and resonant response decreases with the modal order rising up.2.Modal interception research. All background response can get from static analysis.The different modalities background response can be obtained by modal superposition method. Definite background energy modal participation factors to obtain the accumulated modal energy participation factor. By accumulating modal energy participation factor, determine the selected modes are reasonable. For double-layer cylindrical reticulated shell structure, before taking 20 modal able to meet demand.3.Consistency in time domain and frequency domain. Simulate the fluctuating wind speed when using linear filtering, and statistical tests; Conducte time history analysis in ANSYS;Get root displacement response variance of each point. CQC modal combination method results agree with using time domain calculation, modal combination using SRSS method and time domain results have a certain error.4.The research to the influential factors of wind-inducedresponse.Use frequency domain analysis method, respectively research the modal coupling terms, fluctuating wind velocity spectrum, spatial coherence function, surface roughness, shape coefficient, the basic wind pressure, damping ratio. Researches have shown that:modal coupling term, the spatial coherence function of the spatial distribution of the vector displacement response influential; shape coefficient for smaller displacement response; surface roughness, the basic wind pressure, damping ratio affects only the displacement amplitude of the response.5.Fluctuating wind equivalent static wind load and wind induced vibration coefficient research. Introduced improved LRC calculated equivalent static wind load principle. Through analysis, the results show that the improved LRC method and CQC method agreement is very well in specified nod, the error is within 6%. By vertical displacement of the three examples of wind vibration coefficient analysis, it shows that the overall distribution of the vertical displacement of wind load factor is gentle, discrete small; The wind vibration coefficient’s maximum and minimum is small gap.