Damping Efficiency Analysis And Experimental Research On The Viscous Damper And The Frame Column Connection

Nowdays,Structure passive damping control technology is an effective method for resisting earthquake.Viscous dampers have many advantages,such as,high energy consumption,stable performance,a little impact for excitation frequency and temperature,good durability.It becomes an important choice for engineers to carry out shock absorption design.Domestic and foreign scholars conducted a large number of experimental studies and theoretical analysis on viscous damper.It has achieved a lot of results.In recent decades,one of the problems that many scholars are committed to studying is the position optimization of dampers,and focused on the optimal placement of the damper at a certain level of a particular level of the structure.However,it is very little research on the detailed position.Especially for cantilever wall viscous dampers,it will produce a large difference in the damping effect of the damper on damper position,stiffness ratio of beam and column structure of energy dissipator and damping coefficient.The paper mainly studies the influence of three parameters on the energy dissipation effect of the damper.It uses story drifts utilization ratio to evaluate the energy dissipation effect of the damper.The main content is divided into five parts to be elaborated:The first part: It mainly introduces the analytical method of viscous damping structure in elastic and elastoplastic state,and it elaborated the type of viscous damper,mechanical model and equivalent linearization theory;The second part: It mainly introduces the proposed background and definition of the utilization of story drifts utilization ratio,and analyze its five major influencing factors: inter-story shear deformation,column axial deformation,column-beam joint rotation,cantilever wall deformation itself caused and deformation caused by damping force.It analyzes in detail the effect of various parts on the utilization of story drifts utilization ratio.The purpose is to explore the influence of the three parameters ?,? and c on the damping efficiency,and proposed the damping efficiency optimization steps for the viscous damping structure.In the third part,It mainly introduces the full-scale model of the shaking table and the test loading system.It is assembled into three test models with fully bolted steel frames for exploring the influence of the difference of dampers on the energy dissipation of the damper.Such as,uncontrolled model,damper side-by-side layout model,damper centering layout model.It has conducted a comprehensive study of three models of shaking table tests and measured the dynamic characteristics of the three models,acceleration response of each floor,strain response of important components,damper displacement.It obtains floor displacement by integrating two accelerations and analyze the seismic performance of the three model structures.In the fourth part,It mainly analyzes and compares the acceleration responses of the three test models,displacement reaction,strain response of important components,and compares the utilization of story drifts utilization ratio and additional damping ratio of the damper side-by-side layout model and damper centering model.Based on the shaking table test,it uses SAP2000 software to perform dynamic elastoplastic time history analysis of the test model.It compares the experimental values and calculated values of period,mass,acceleration,displacement,damper output,and damper displacement and demonstrated that the use of viscous dampers can effectively improve the seismic performance of the structure.It can be seen from the data comparison between the damper arrangement model and the damper center arrangement model.The closer the damper position is to the beam span,the larger story drifts utilization ratio was,the smaller additional damping need for achieving the same desired additional damping ratio;The fifth part,It mainly analyzes actual engineering examples.It uses SAP2000 software to analyze and contrast the uncontrolled model,the damper layout model and damper centering model.On this basis,the stiffness ratios of the three substructures of the substructure beam are improved,and three new models are obtained.It compares and analyzes the acceleration response,displacement response,interlayer displacement utilization,and additional damping ratio of the six models.In order to comprehensively explore the influence of the three parameters ?,? and c on the damping efficiency,using SAP2000 software to establish a series of models for time history analysis.Through data comparison,we can demonstrate again: The best position for the viscous damper arrangement is the mid-span of the beam.The larger story drifts utilization ratio was,the smaller additional damping need for achieving the same desired additional damping ratio with the stiffness ratio for beam and column of energy dissipation substructure increased.The damping coefficient is proportional to the stiffness ratio of the beam to the column.The higher the stiffness ratio of beam-column line and the damping coefficient should be large.