Cantilever wave type steel structure and cantilever hyperboloid-shaped grid of mega single building are unique in shape,long in planar projection and their mounting heights are high.

Farther,an actual building destroyed by typhoon was investigated employing the material and geometrical nonlin-earity method and the failure principium of cantilever space truss under typhoon was studied.

Based on these, the theory studies and design of the wind vibration control for a large cantilevered steel spatial truss with circular tube viscoelastic dampers of the roof engineering at Hefei Olympic Center is finished and this building engineering has been set up and got a good social benefit and economic benefit.

According to complicated structure shape and difficult construction,multi-layers steel tube cantilever frame is adopted,its key technology and experience are introduced accordingly.