Energy Dissipation Optimization Of RC Frames With Viscoelastic And Viscous Dampers

Structural energy dissipation control technology has the advantages of reducing of structural seismic response and dissipated energy,so it is more and more used in building structures.Viscous dampers provide energy dissipation for structures,but their cost is expensive;while viscoelastic dampers have lower cost and provide damping,but they increase the stiffness of structures and then change the natural frequencies,Combining the complementary characteristics of viscous dampers and viscoelastic dampers,this paper designs a reasonable scheme with dampers,which can achieve better seismic mitigation effect.Therefore,in this paper,the mixed distribution of viscous damper and viscoelastic damper is studied in the structure scheme,the main contents are as follows:(1)Through researching and analyzing the relationship between dampers parameters and the maximum floor displacement angle as well as the base shear force of RC frame structure with additional dampers.The deviation between the shock absorption layers and the multi-channel shock absorption layers can be obtained by using the integration formula,And the number of shock absorption layers can be predicted.By non-linear time history analysis of several schemes for the arrangement of the single-channel shock absorption layers of dampers,The results show that:The larger the damper parameters(dampers index and dampers coefficient)are,the better the effect of energy dissipation will be,but when the parameters increase to a certain extent,the effect of vibration reduction will become less and less obvious and the economy of the structure will be reduced;when the viscous damper layers are located in the lower and middle parts of the structure,the effect of reducing the inter-story displacement angle will be better;when the viscous elastic damper layers are located in the lower and upper parts of the structure,the effect of vibration reduction will be better.(2)By adding viscous dampers and viscoelastic dampers to RC frame structures at the same time,11 mixed energy dissipation distribution schemes were obtained.The seismic analysis results show that when mixing dampers are arranged,viscoelastic dampers are arranged in the upper part of the structure,and viscous fluid dampers are arranged in the middle and lower parts of the structure,which have better energy dissipation effect than other schemes.(3)By optimizing the hybrid energy dissipation design of a RC frame structure with 9-story,after determining the location of the shock absorption layer,the parameters of each shock absorption layers are estimated according to the energy dissipation ratio formula of shock absorption layers.The results show that the displacement angle decreases by 40%when the viscous dampers are installed on the 2nd and 3rd layers and viscoelastic damper are set on the 6th and 7th layers.The shock absorption scheme can achieve the goal of shock absorption and provide guidance for future engineering examples.