Research On Seismic Performance Of Frame Structure Based On New Type Of Enlarged Joint Damper

With the development of the society,the new version of the "China Earthquake Parameter Zoning Map" completely eliminates "no defense zone",and puts forward higher requirements for the seismic performance of building structures,which has made engineering and academic circles pay more and more attention to improving the seismic performance of structures.A lot of research and development work has been carried out on energy dissipation technology.Based on the design concept of strong nodes and weak members,this paper proposes a new type of node damper with amplification function.The damper can be easily installed at the beam-column node and has a small and beautiful body,which effectively protects the beam-column node.This article focuses on the following aspects:(1)Explain the devastating nature of earthquake-induced disasters in the past three years and the need for seismic shock absorption,and introduce the principle of energy dissipation work and its high cost performance in building structures.In view of the research on viscoelastic energy dissipators at home and abroad and the shortcomings of most dampers in the market,the unique advantages of the new amplified node damper are pointed out.(2)In-depth study of the structure of the amplified damper and its amplification principle,and design a damper with no amplification function and the same size,use the finite element software ABAQUS to establish a refined model of the damper for loading research,and obtain the new node damper The mechanical performance parameters such as the return curve and the skeleton curve are compared and analyzed with the mechanical parameters of the non-amplified damper.It can be seen that the amplified node damper consumes 9 times the energy consumption of the non-amplified damper.(3)Experimental research on a new type of enlarged node damper,exploring the accuracy of the simulation method and results.The hysteresis curves obtained from experiments and numerical simulations are stable with good regularity and symmetry.The simulated yield force is 56.4k N,and the test yield force is 55 k N.The simulation results show that the initial stiffness is 80.59 k N / mm,the equivalent stiffness is 12.70 k N / mm,and the initial stiffness of the test specimen is 16.25 k N / mm,which is equivalent.The stiffness is12.12 k N / mm.It can be seen from the comparison that the simulation and experimental studies on the damper except for the initial stiffness difference of 5 times,the yield force and equivalent stiffness are almost the same.(4)Research on a multi-scale single-truss frame structure based on a new enlarged node damper.The MPC beam connection method is used to establish a multi-scale model framework,and the modal,pseudo-static and pseudo-dynamic analysis of linear models,multi-scale models,and solid models is carried out.The research results show that:pseudo-static and modal analysis,multi-scale models and The dynamic response of linear and solid models is almost the same;under dynamic loading,the multi-scale model can well simulate the structural response state under the action of earthquakes;the refined model has twice the calculation cost of the multi-scale model under each loading condition.The analysis of the vibration reduction effect of the multi-scale frame before and after the installation of 2,4,and 6 dampers,the results show that after installing 6 amplified dampers,the maximum inter-story displacement decreases by 39.59%,and the inter-story displacement angle The decrease was 39.63%,the inter-layer displacement decreased by 54.67%,and the displacement angle decreased by 54.44% under rare earthquakes.(5)Research on the frame structure based on the new enlarged node damper.The ordinary concrete frame and prefabricated frame were designed by PKPM,and the static elastoplastic analysis and dynamic elastoplastic analysis of the structure under rare earthquakes were performed.In the static analysis,the capacity curves,performance points,inter-layer displacements,inter-layer displacement angles,and plastic hinges of the shock-absorbing structure and the original frame structure were compared.The maximum bearing capacity of the concrete frame increased by about 12%-18%,and the maximum reduction of the inter-layer displacement and the inter-layer displacement angle was 27.2%and 29.0%.The maximum bearing capacity of prefabricated frame increased by 43.2%-55.5%,and the maximum reduction of inter-layer displacement and inter-layer displacement angle was 48.2% and 39.7%.In the dynamic analysis,the vertex displacement,vertexacceleration,Shear force between layers,displacement between layers,displacement angle between layers,and working condition of the damper.The control effects of the maximum displacement,acceleration,and inter-layer displacement angle of the concrete frame were35.3%,31.7%,and 29.1%,respectively.The control effect of the maximum value of vertex displacement,acceleration,and inter-layer displacement angle of fabricated frame is 42.1%,49.1%,and 34.9%,respectively.The full working curve of the damper further illustrates its good seismic effect.