Analysis Of Seismic Performance Of Displacement-Amplified Viscoelastic Damping Steel Frame Structure

Based on this background,more and more experts and scholars in the field of structural engineering have done a lot of research work on the active,semi-active and passive energy dissipation technology of building structures in recent years.In this paper,a new type of viscoelastic damper with displacement amplification mechanism based on lever principle is developed to solve the problem that the traditional viscoelastic damper can not exert its energy dissipation ability.The main research contents are as follows:(1)The research background,aim and practical significance of this subject are described in detail,and then the research status of energy dissipation technology and viscoelastic energy dissipation devices in recent years are systematically summarized.Aiming at the problems existing in most common dampers,an amplified viscoelastic damper with displacement amplification function is proposed,and the main research contents of this paper are determined.(2)In this paper,the displacement amplification mechanism of viscoelastic energy dissipation device AVED is analyzed theoretically.Firstly,the components of AVED are briefly introduced,and the principle of its displacement amplification effect is described in detail.Based on the working principle of AVED and its stress in actual frame structure and geometric kinematic relation,the restoring force formula of corresponding amplified damper is deduced.The energy dissipation characteristic of amplified damper is verified by MATLAB programming,and the improvement of hysteresis energy dissipation capacity of AVED is analyzed under different displacement amplitude and frequency.(3)UEL subroutine suitable for implicit algorithm and VUEL subroutine suitable for explicit algorithm are compiled based on FORTRAN language by using the secondary development function of ABAQUS unit according to the resilience theoretical formula of AVED.The correctness of the subroutine of AVED unit is verified by comparing the theoretical calculation results of ABAQUS unit load simulation and MATLAB program under two working conditions.(4)The finite element simulation software ABAQUS is used to establish the numerical model of a high-rise steel frame structure,and the correctness of the ABAQUS model is verified by comparing with the modal analysis of YJK model.The dynamic nonlinear time-history analysis of uncontrolled structure,VED damping structure and AVED damping structure under fortified earthquake and rare earthquake is carried out here.The results show that,compared with VED model,AVED-2 model and AVED-3 model reduce about 33%,53%,22%,37%,24% and 39% respectively,which shows that AVED is more effective in controlling the dynamic response of steel frame structures.(5)A reasonable number of seismic wave time history records are selected to analyze the collapse vulnerability of high-rise steel frame structures by IDA method,and the improvement effect of AVED on the seismic performance of steel frame structures is quantitatively analyzed from the perspective of probability statistics.Compared with the VED model,the failure probability of AVED-2 model and AVED-3 model is reduced by 43% and 57%respectively,and the safety reserve coefficient is improved by 35% and 68% respectively.