Research On Damping Performance Of Damped Redundant Outrigger Frame-core Tube Structure Under Long Period Ground Motion

The frame-core tube super high-rise buildings often use an outrigger to connect the core tube and the frame column together to resist earthquake effect,but the outriggers will cause the problem of stiffness mutation,and the hard-resistance will cause some cumulative damage to the structure.The energy dissipation technology is a hot spot in the study of earthquake resistance,The damped outrigger utilizes the difference in deformation between the core tube and the frame column and dissipates part of the seismic energy of the input structure to achieve the purpose of shock absorption.The Taiwan Chichi earthquake,the Wenchuan earthquake,and the Great East Japan Earthquake made the high-rise and super-high-rise structures far away from the earthquake source suffer more serious damage than other structures.The damage of the long-period ground motion to the long-period structure attracted the attention of scholars.In order to investigate the damage mechanism and energy dissipation mechanism of the super-high structure of frame-core tube under the action of long-period ground motion,and the shock absorption performance of long-periodic ground motion of the damped outrigger structure,the main research work of this paper is as follows:1.First,the 3 elements from the ground motion are compared with the difference between the ordinary ground motion and the long period ground motion.The intensity includes the peak and peak ratio of the ground motion,and the spectrum includes the Fourier spectrum and the response spectrum.The results show that the long period earthquake motion is longer,the intensity is larger than the ordinary ground motion except the PGA,and the low frequency components are rich.The response spectrum of the long period ground motion is obviously larger than the ordinary ground motion after the structure's vibration period is more than 0.5s.2.According to the concept of damped redundant outrigger,a frame-core tube super-high-rise structure was designed using ETABS software as a new damped outrigger structure,and compared with the horizontal damper scheme and a lasso setting damper scheme,a new type damper electric eddy current damper is selected,and two kinds of ground motions are entered into two kinds of knots respectively.The time history analysis is carried out in the structure.Firstly,the response differences of seismic structures under two kinds of ground motions are compared,and then the shock absorption effects of three different shock absorption schemes under two kinds of ground motions are analyzed.The results show that the response of the frame-core tube structure is greater under long-term ground motion and the structural response easily exceeds the specification limit.The three shock absorption solutions can play a damping role,but the shock absorption effect under different types of ground motion is difference.3.The general finite element software ABAQUS is used to design a practical project into a new type of damped outrigger structure,and two types of ground motions are input into two structures for seismic elastic analysis,and the fortification and rare earthquake elastoplastic analysis are fortified.The damage evolution process of seismic structure under the action of fortified ground motion is compared in detail.The influence of the setting of damped outrigger on structural damage is studied in depth.The results show that the damage of seismic structure is more serious under the action of long period earthquake,and the law of damage is different from that of ordinary ground motion.The setting of damped outrigger has certain damping effect on continuous beam,structure bottom wall limb,concrete tensile damage and frame beam stress,and the plastic energy consumption of structure is reduced.