Study On Dynamic Response And Seismic Control Of The Long-Span Suspen-Dome Steel Structure

The Suspen-Dome structure is composed of a single-layer reticulated shells structure and a cable dome structure without the upper structure.It combines the advantages of both lattice shell structure and cable structure,and has the characteristics of high bearing capacity and large application span.It is gradually widely used in engineering practice.However,the Suspen-Dome structure has a large span and a large number of members,and when subjected to strong loads,serious nonlinear mechanical behavior will occur.Strong earthquake observations indicate that structures can undergo varying degrees of damage and destruction under earthquake action,posing a serious threat to the safely of people’s lives and property.In view of this,this article takes an actual project of a Suspen-Dome as an example to conduct dynamic response analysis on its seismic performance under multi-dimensional seismic action;And further research was conducted on the structural damping effect and optimization measures under different damping control strategies.The main research content and conclusions are as follows:(1)Taking an actual engineering case of a suspen-dome as a reference,establish its ABAQUS finite element model and conduct modal analysis.Taking the maximum displacement of the node and the maximum stress reduction rate of the member as indicators,further comparative analysis is conducted on the dynamic response of the structure under unidirectional,bidirectional,and three-dimensional seismic waves.The analysis shows that the horizontal stiffness of the suspen-dome structure is greater than the vertical stiffness;Under different seismic wave input modes,the structure mainly undergoes vertical deformation;Under three-dimensional seismic action,the seismic response of the structure is greater than that of unidirectional and bidirectional seismic wave inputs.(2)Conduct a study on the impact of damper arrangement forms and their parameters on the seismic performance of Suspen-Dome structures,and compare the control effects of Suspen-Dome structures using different damper arrangement forms,damping coefficients,and stiffness coefficients under the action of El-Centro waves,Taft waves,and artificial waves.The results indicate mat the seismic response laws of structures under the action of three types of seismic waves are similar;Compared with uncontrolled structures,the maximum displacement of nodes and maximum stress of members in Suspen-Dome structures with viscoelastic dampers are significantly reduced.The analysis of the arrangement form selection shows that when the viscoelastic damper is placed between the outer column top of the structure and the lower chord node of the ring truss web member,the peak displacement and peak axial force of the member are most significantly reduced;The analysis of damper parameter selection shows that when the damping coefficient is around C0=9000 kN-s/m and the stiffness coefficient is around K=65000 kN/m,the seismic reduction effect of this structure is the best..(3)Referring to the research conclusions on the dynamic response and seismic control of the Suspen-Dome structure mentioned above,further optimization control of the structure is carried out,and the optimization effect of the three-dimensional isolation friction pendulum support on the string supported dome structure with additional viscoelastic dampers is analyzed.The results show that setting friction pendulum bearings can further reduce the peak displacement of nodes and the peak axial force of members;Friction coefficient of friction pendulum support μ The structure has the best shock absorption effect between 0.01 and 0.03..