Wind-induced dynamic behavior and its load estimation of a single-layer latticed dome with a long span

Abstract

This paper describes the results of some basic investigations on the wind-induced dynamic behavior and the resultant load estimation of a single-layer latticed dome with a long span. The wind pressures at many locations on dome models were measured simultaneously in a wind tunnel. The dynamic response of several dome models was analyzed in the time domain by using a finite element method. For generating a time history of the wind load vector, which consisted of concentrated loads at all internal nodes, the proper orthogonal decomposition (POD) technique was applied to the wind pressure data obtained from the wind tunnel experiment. The nodal displacements and the resultant member stresses, both axial and bending, were computed at each time step. Based on the results, the characteristics of the wind-induced dynamic response of the dome are discussed. In the analysis, special attention is paid to the vibration modes that dominate the dynamic response. Furthermore, a brief discussion is made of the load estimation for the dome. A simple model for estimating the design wind load, expressed as an effective load, is proposed.