Research On Wind Loads And Wind-induced Responses Of Large-span Aircraft Maintenance Hangars

Wind load is one of the major loads for large-span aircraft hangar's design due to its high flexibility, low natural-frequency, flat shape, irregular distribution of mass and stiffness as well as sensitivity to different load cases. Up to now, less research has been done on wind tunnel test and wind-induced dynamic response of large-span hangars around world, and the design parameters of wind load given by current Codes for the design of building structures are not applicable to such long-span structures. Therefore, it is of vital importance in theory and engineering practice to further understand the wind loads of large-span hangar structures. Wind tunnel test, theoretical analysis and numerical simulation have been carried out hereby to investigate the wind loading distribution and wind-induced dynamic response on hangars. The wind load shape factors and wind fluttering factors have been presented. The main research work covered in this paper includes:(1)Based on the results of three large-span hangar structures obtained from wind tunnel tests, distributions of mean/fluctuating wind pressures coefficient contours, influences of wind pressures by parapets, internal pressures in different door-open conditions, are investigated. The characteristics of wind pressure spectra on roof are studied and the fitted formula is provided by using MATLAB optimization tools.(2)The wind-induced responses are analyzed for different types of hangar roof structures using frequency-domain method. Some important parameters including modal numbers, cross terms of modals, damping ratios are discussed carefully. The fitting formulas of wind pressures spectra based on wind tunnel test are adopted for A380 hangar wind-induced response analysis. The time-domain method is also adopted to perform the wind-induced dynamic analysis for A380 hangar roof and its calculated results are compared with that of analyzed by frequency-domain analysis.(3)The wind load shape factors suitable for large-span hangar structures are presented according to the wind tunnel tests results and the provisions from foreign Codes. After large-scale parametric analysis, a practical formula of wind fluttering factors for 72m to 150m single span hangars is proposed. The equivalent static wind loads are analyzed for A380 hangar.(4)In terms of the analysis results above, the wind-resistant design parameters and principles are discussed and a scientific calculated method for wind-resistance design of large-span hangars is proposed.