Study On The Relationship Between Stiffness And Damping Contribution Of Displacement Damping Structure

For the widely used displacement metal damper damping structure,the determination of the pre-shocking scheme is very important.How to determine the stiffness and quantity of the damper to obtain the expected additional damping ratio to achieve the expected damping effect,It has become the primary problem that needs to be solved in current engineering practice.Using the currently widely recognized time history analysis method for design research,designers often need to repeatedly calculate the structure,and also need to consider adjusting the parameter settings of the additional system to make the damper energy consumption more Ability,this design process is complex and cumbersome.In this context,this paper studies the relationship between the stiffness and damping contribution of the displacement-type displacement damper damping structure,in order to provide an optimization design and economic analysis of the metal damper damping structure in the future.In this paper,the constitutive model of the damper and the calculation model of the energy-damping structural system,the elastic stiffness of the additional system and the elastic stiffness of the main structure are analyzed.The influence of the additional damping ratio on the response spectrum is studied to determine the damping effect.The coefficient,the stiffness effect coefficient is proposed,the displacement reduction rate is the control target,the structural requirement stiffness is determined to achieve the expected damping ratio,and the additional stiffness and damping are combined to achieve the optimal damping effect.At the same time,in order to study the deficiencies of the damper energy efficiency,the calculation formula of the additional damping ratio is derived,and the effective damping ratio curve of the structure is obtained.The support stiffness ratio(the horizontal stiffness of the supporting member and the initial elastic stiffness ratio of the damper)is considered.The elastic stiffness ratio of the additional system(the ratio of the stiffness of the energy dissipation system to the initial layer stiffness of the uncontrolled structure)and the ductility coefficient of the additional system(the ratio of the system displacement to the yield displacement of the additional system)are three important parameters that affect the damping efficiency of the performance damping structure.Detailed theoretical analysis and simulation studies were carried out,and the recommended range of values was given.Finally,the damping effect was verified by a series of simulation calculations and engineering applications,and a simplified design method for damping efficiency was extracted.(1)The elastic stiffness ratio SR of energy dissipation system and ductility coefficient of main structure are used to evaluate the seismic reduction efficiency of the system.The formula for calculating the additional damping ratio of soft steel is deduced,and the curve of effective damping ratio of the structure is obtained.(2)In this paper,the single-degree-of-freedom and multi-degree-of-freedom analysis models are established.The effects of three main factors,i.e.the ratio of support stiffness B/D,the ratio of elastic stiffness SR of energy dissipation system and the maximum ductility coefficient of the main structure,on the energy dissipation efficiency of the damper are comprehensively considered.It is suggested that the middle column type soft steel damper should be arranged in the middle of the beam to obtain the optimal damping ratio,the ratio of support stiffness B/D should be 2-5,the ratio of elast The coefficient of sex is 2-4.(3)Based on the seismic code,the relationship between the stiffness and the additional damping ratio of the structure with additional metal dampers is given.For the frame concrete structure with 1/550 of the code requirement,it is suggested that the value of the additional damping ratio should be in the range of 1%~2%.(4)Through theoretical analysis and engineering examples,the feasibility of the proposed method based on displacement reduction rate is verified.At the same time,on the basis of the existing design methods,a complete flow chart of "displacement-based design method of metal soft steel dampers" is developed for the seismic design of frame structures,aiming at providing guidance and suggestions for the optimization design and economic analysis of metal soft steel dampers in the future.