Vibration reduction analyses of Beijing A380 hangar structure with viscous dampers

In order to study the seismic response reduction results for large-span space frame hangar structures,vibration control analyses were performed for Beijing A380 hangar structure subjected to three-dimensional earthquake ground motions.Viscous dampers were adopted as the vibration control device.The target of the control was to reduce the vertical displacement of nodes of the roof structure.The dampers were installed in the roof space frame,in the lateral load resistant structure,in both roof space frame and lateral load resistant structure,respectively.Different control approaches were compared.The analytical results indicated that when the dampers were installed on the roof frame structure,the nonlinear dampers provided about the same control effects as the linear dampers.The vibration control results of "replacing approach" were better than that of "appending approach",and replacing the web members between bottom chord and middle chord had better efficiency than replacing those between middle chord and upper chord.Installing the dampers at the middle part of four perimeter sides was much effective comparing with installing the dampers along the four perimeter sides uniformly or around the nodes which had the maximum vertical displacement of the original structure,the number of dampers should be properly determined.Installing the dampers in the lateral force resistant structure was more effective than installing them in the roof space frame.Moreover,installing the dampers both in the steel space frame and in the lateral force resistant structure could improve the control performance.This paper provides a useful reference for practical application of viscous dampers in super long-span space frame structures.