Performance And Experimental Research On A New Type Of Viscous-damping Wall

Viscous-damping wall is a kind of damping device applied to energy dissipation of buildings.Based on the existing scientific research,this paper proposes a new type of viscous-damping wall.This paper mainly focuses on the form of shearing structure and damping medium.This paper systematically analyzes the rheological properties of the damping medium used in the new type of viscous damped wall.The correlation between the mechanical properties of the damping medium and the influencing factors of temperature,frequency,amplitude,etc.was obtained from the oscillation test;the viscosity-temperature curve and rheological curve of the material was obtained by the rotation test;the physical state of the material,creep compliance,and other physical quantities change over time were acquired form the creep recovery test and relaxation test.The above experiment proves that the damping medium used is a high-molecular polymer with a combination of viscous damping media and viscoelastic damping media.The mechanical properties of the damping medium will change with temperature,frequency,and amplitude.The stress-strain relationship of the material conforms to the flow curve of the power-law fluid.Creep recovery test and relaxation test can confirm that the material has obvious residual deformation,and the creep compliance at room temperature conforms to the variation law of viscoelastic liquid.Based on the above experimental research,the Burgers rheology model is accorded with the damping medium well.The storage modulus and the loss modulus of the Burgers model in the frequency conform to the material as well,which verifies using Burgers model is rational.Using the rheological properties of the materials obtained,the theoretical analysis of the plate shear motion model located in the viscous damped wall box studied in this paper was carried out,and the theoretical calculation formula of the material in the shearing motion of the plate was summarized.This paper designs and manufactures a new type of viscous damped wall model,and completes a dynamic performance test on it.The relationship between the dynamic performance of the new viscous damper wall and the loading displacement amplitude,the loading frequency,the loading speed and the temperature of the damping medium is studied.The durability under the action of the earthquake and wind vibration is also analyzed.The experimental results show that the dynamic performance of the new type of viscous damped wall has certain correlation with the displacement amplitude and loading speed.Mechanical properties change with temperature in a controllable range and it has stable durability.Based on the experimental data,combined with the theoretical derivation in Chapter 3,the theoretical calculation formula for the damping force of the viscous damped wall is proposed in this paper,and its rationality is verified.With the help of the FLUENT 6.3 finite element analysis software,this paper performs CFD analysis of the flow field inside the box during the working process of the new viscous damped wall.Combining the basic theory of fluid mechanics,comprehensive analysis of the influence of multiple parameters on the internal flow field morphology is studied.The analysis results show that the space between two plates,the amount of the plates,and continuity of the distribution patterns of the shear steel plates in the viscous damped wall could affect the damping force that the damping wall can provide.The root cause of this phenomenon is the changes in the velocity gradient distribution of the flow field,and different forms of construction of the plates which could trigger the interaction between differential pressure resistance and frictional resistance so that the flow field shape inside the damping wall will change greatly.In summary,based on the rheological tests of damped media,the mechanical model analysis of damping materials and theoretical studies,the mechanical properties of the new-type viscous-damping wall,and the CFD analysis of the flow fields of damping media,it is proved that the viscous-damping wall and the damping medium have stable performance and good energy dissipation performance under common operating conditions,and have high engineering application value.