Utilization of the Proper Orthogonal Decomposition Method in Wind-Resistant Analysis of Large-span Spatial Structures

摘要

Proper Orthogonal Decomposition (POD) is an approach used to derive the most efficient coordinate system for observing individual phenomena. In this paper, considering the characteristics of the obtained coordinate system, utilization of the POD method in wind-resistant analysis of large-span spatial structures was discussed. Firstly, a framework for reconstruction of the measured wind field according to the information obtained from limited measurement points in order to get the dynamic distribution of wind pressure on the whole surface was presented for time-history analysis of wind-induced vibration. Then, considering the time-consuming problem in time-history analysis, order-reduced model analysis strategies were presented based on the POD method. Finally, by using the data obtained from wind tunnel tests of a spherical shell and a cylindrical shell model, the efficiency and the consistency of the wind pressure field reconstruction method, as well as the results between the presented order-reduced model analysis strategy and the conventional approach were investigated, which show that these methods are very useful and efficient for wind-resistant analysis of large-span spatial structures, especially in keeping the correlation of the measured data in space and time domains.