Steel Frames With Additional Viscous Dampers Study On The Seismic Absorption Performance Of Structures

After decades of research,viscous dampers have been widely used in engineering applications,but now the focus of research on viscous dampers is mostly on new viscous materials or new dampers,new models of dampers have been applied,and the research on the optimal placement and layout of buildings is less.The main purpose of this paper is to determine the amount of viscous damping for multi-storey structures by multiple method,to compare and analyze the seismic response under different allocation schemes,and to measure the seismic level of structures comprehensively by seismic response value,inter-storey displacement angle and energy dissipation of dampers.The main research work and results of this paper are as follows:(1)An example model is established.According to the size of beams and columns,the lateral displacement mode of the structure and the distribution shape of the multiparticle system model,the building structure is simplified as a floor model,and the quality of each floor is concentrated separately with each floor as a particle to form a series of particle systems.Based on the simplified example model,the static elasticplastic analysis method is used to analyze the structure.The seismic action is simplified as horizontal load,and the horizontal load distribution is inverted triangle.The restoring force eigenvalues of the model are determined according to the inter-story displacement and inter-story shear obtained by the static elastic-plastic method.(2)The equivalent linearization method is used to transform the multi-particle model into a single-particle model.Taking the single-degree-of-freedom system as an example,the multiple method is used to find the optimal damping,i.e.adding different numbers of viscous dampers to the system,and comparing and analyzing the seismic responses of the structures with different damping quantities under different seismic waves to determine the optimal damping quantities.The optimal viscous damping quantities of single-particle are 10.When the self-viscous damping is doubled.(3)Analyzing the 20-storey model,using five different allocation modes,the dynamic time history analysis of five different working conditions is carried out,and the seismic response,inter-storey displacement angle and viscous damper energy dissipation of five working conditions under different earthquakes are compared and analyzed to compare the advantages and disadvantages of different working conditions.The allocation mode of working condition 5 is the best.(4)The validation model of 15-storey shear structure is simplified as 20-storey model.The restoring force eigenvalue of the structure is determined by static elasticplastic analysis method.The single particle model is determined by equivalent linearization method.The optimum damping is found by multiple method.Then,the same five working conditions are used to distribute the model.The different working conditions are compared under earthquake.Seismic response,inter-story displacement angle and energy dissipation of viscous dampers also show that the mode of mode 5 has better seismic reduction effect,which is consistent with the distribution results of 20-story model,and also verifies the rationality of the seismic design method proposed in this paper.