Wind-induced response and wind resistant design of long-span curved roofs considering the unsteady aerodynamic forces

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First, a survey was made regarding the geometric and structural characteristics spatial structures constructed in Japan in the last quarter century. The wind resistant design methods used for realizing these structures were also investigated.Then, the wind-induced response and its load estimation of several spatial structures were investigated. The subjects of this study are as follows :1.Model of wind pressure field on circular flat roofs and its application to the estimation of wind loads for the design of structural frames and cladding.2.Model of wind pressure field on spherical dome and its application to the estimation of wind loads for the design of structural frames and cladding.3.Proposal of a new load estimation system using aerodynamic database, neural network and time-history simulation technique for the design of cladding of spherical domes.4.Load estimation for a long-span greenhouse with a wing-like cross section.The technique developed in 3. will be expanded to cylindrical roofs. With this technique, the design wind lads can be evaluated quite easily without making any wind-tunnel experiment.Finally, the aerodynamic damping of spatial structures was investigated. A review of previous studies on the aerodynamic damping, or the vibration-induced wind forces on long-span roofs was made. Consequently, an experimental apparatus for measuring the vibration-induced forces. on a cylindrical roof in a wind tunnel has been developed.