Analysis On Seismic Of Frame-Tube Structure With Damped Outrigger System

In the wake of the continuous breakthrough of the number of stories and the overall height of high-rise buildings,because the seismic behavior of structure can be improved obviously under horizontal loading after setting up the strengthened story,more and more frame-tube structures with strengthened story have been employed in engineering projects.However,the setup of strengthened story also has some adverse effects on the structure,the adverse effects can be reduced by setting energy dissipation devices.Due to the excellent earthquake mitigation effect and low cost of the damped outrigger system,it has become an important research direction in the field of civil engineering.Therefore,it is of great importance to study the seismic behavior of frame-tube structure with damped outrigger system.This paper is based on a practical project in Shenzhen,uses the general FE analysis soft ware ETABS to set up a frame-tube structural model after proper simplification,and the results have been compared with the traditional fixed outrigger such as:natural vibration period,story displacement,story drift and story shear,investigates the seismic behavior of frame-tube structure with damped outrigger system.Because of different layout formats of the viscous damper,damped outrigger systems have different types,the thesis establishes different models,and compares with the traditional fixed outrigger to discuss the earthquake mitigation effect of the damped outrigger system under the lateral earthquake action.Then choose the damped outrigger system which has most excellent earthquake mitigation effect,study the structure seismic behavior of the damped outrigger systems which have different damper parameters by changing the damping coefficient or the velocity index.Through the comparative analysis,the following conclusions are drawn:these structures with damped outrigger systems have excellent earthquake mitigation effect on story displacement,story drift and story shear.For this practical project,the damped outrigger system with vertical inclined brace has the most earthquake mitigation effect.The damping coefficient of the viscous damper is suggested to choose in1000¹500kN/（mm/s）^0.3,the velocity index is suggested to choose in 0.3⁰.7,which can ensure the earthquake mitigation effect and control the corresponding cost at the same time.