Study on energy dissipation technology and connection design for outriggers and belt members of super high-rise buildings

In frame-core wall structural system,the outriggers and belt members can significantly improve the lateral structural stiffness and decrease the lateral deflection. However they will bring adverse effects such as abrupt change of structural stiffness and internal force. Based on one super high-rise building,the damping effect of viscous dampers in the outrigger was analyzed under frequent and rare earthquakes. The optimal position and efficiency of damper belt truss in super high-rise building were analyzed. The results show that viscous dampers in outrigger can reduce the plastic damage to the core wall and reduce the dynamic response of the structure. It is appropriate to place damper belt truss in the story where relative velocity is large. Efficiency of damper belt truss decreases with the increasing of structure height. The connections between the outrigger and the frame column as well as core tube were analyzed and suggestions are given on connection design.