Dynamic Nonlinear Analysis Of High-rise Building With Damped Rigid Outrigger Storeys

Frame-core tube structure is generally adopted in high-rise building structure.In order to improve the connection between the outer frame and the inner core tube and resist the lateral force together,the traditional way is to add the extension arm between the outer frame and the inter core tube.This method can effectively use the bending deformation of the upper part of the structure so that the axial force of the frame column is involved in the lateral force,reducing the overturning moment of the core tube and the lateral displacement of the structure.Because this way increases the overall stiffness of the structure,so the action of the earthquake prone to stress concentration and internal force mutation.Jeremiah proposed the provision of a viscous damper between the truss and the outer frame post,which dissipates seismic energy by utilizing the relative deformation between the extensor truss and the outer frame post caused by the bending deformation of the structure.The Maldives Saint Francis Shangri-la twin tower in the Philippines and the North East Asia Trade Building also set up a viscous damper between the truss and the outer frame,the result indicate that the scheme can effectively control the structure response under wind load and earthquake.On the basis of summarizing and absorbing research results from the domestic and foreign,this paper deeply studys on the arrangement of viscous dampers with magnifying interlayer displacement effect,and obtains some conclusions about the design.The details are as follows:(1)Through the analysis of the seismic performance of the typical frame-core tube structure in the deployment of the arm-piercing layer,the optimization of the position of the boom is carried out to study the effect of the number of layers on the seismic performance under the same damping coefficient influences.It is known that the position of the arm should be set reasonably so as to obtain the best seismic effect.(2)By comparing the seismic performance of the model under frequent earthquakes and rare earthquakes,it can be seen that there is a nonlinear relationship between the damping force and the velocity of the viscous dampers.The influence of damped rigid outrigger storeys on structural under rare earthquake is not as good as under the earthquake.(3)As the damping force absorbs a large amount of vibration energy,the extensor damping layer has some improvement on the plastic damage of the structure under rare earthquakes.(4)By changing the angle between the damper and the frame column,the seismic performance of the extensor damping layer is studied by the change in the angle of the damper.It can be seen that the angle between the damper and the frame is smaller,the effect of the extension arm on the displacement of the interlayer is more obvious,the better the seismic performance.(5)The ratio of the core area to the total area of the structure is changed to analyze seismic performance.The result show that the extensor damping layer also has good damping performance and the effect is similar to that before the change.(6)Setting the outrigger damping layer between the outer frame column,and to study its seismic performance.The results show that this method can effectively reduce the interlayer displacement angle and the top displacement,but the control effect of the layer shear is not very good.