Parametric Sensitivity Study On Wind-induced Vibration Response Of Single-layer Reticulated Shells

Most of modern space structures have characteristics of long span, light weight,small damping and intensive natural frequencies, thus they are more sensitive to theeffect of wind loads and the wind-resistant design is often an important part in thedesign of these structures. According to the existing research, it has been mature aboutthe wind-resistant analysis under the given wind loads and structures. But in fact, notonly structures but also wind loads both have some degree of uncertainty. The definiteanalysis can not assess the impact of various uncertainties on the results of analysis andalso can not give the actual structures the guaranteed rate. Obviously, it does not meetthe requirements of modern structural design based on the reliability theory. Therefore itis necessary to examine the influence of various uncertainties on the uncertainty ofwind-induced vibration which lay the foundation to further establish the reliabilitytheory of structural wind-resistant design.This paper aims at single-layer spherical reticulated shells and single-layercylindrical reticulated shells and study the impact of uncertainty factors includingaerodynamic parameters and structural parameters on the uncertainty of wind-inducedvibration by sensitivity analysis, thus to explore the uncertainty of transmissionmechanism. The main contents in this paper are shown as follows:1. The commonly used sensitivity analysis methods and parametric samplingmethods are summarized and parametric analysis method of wind-induced vibrationresponse of single-layer reticulated shells based on the he Latin Hypercube Sampling(LHS) and the combination of local sensitivity analysis and global sensitivity analysis isput forward.2. Aiming at single-layer spherical reticulated shells and single-layer cylindricalreticulated shells, the large-scale independent sampling wind tunnel test is accomplishedto gain respectively1411and1347time history samples of pressure.3. Aiming at single-layer spherical reticulated shells and single-layer cylindricalreticulated shells, local sensitivity analysis is used to study the impact of structuralfactors including roof loads, cross-section areas of rods, structural damping and theinitial imperfections of structure on the uncertainty of wind-induced vibration and roofloads and cross-section areas of rods which influence most are determined. The sobol’method is used to make global sensitivity analysis with the combination of wind loadsand the selected two structural parameters to determine the sensitivity value of everyfactor. It is shown that the wind loads have dominant contribution to the uncertainty ofthe extreme value of wind-induced vibration response, the impact of coupling effect ofwind loads and structural parameters on the uncertainty of the extreme value of wind-induced vibration response can not be ignored. 4. The further analysis on the wind loads and wind-induced vibration response isaccomplished to explore the relationship between structural wind-sensitivity and theuncertainty of wind-induced vibration response. The results demonstrate that the greaterstructural wind-sensitivity, the greater effect of wind loads on the uncertainty of wind-induced vibration response.