Study On Dynamic Hysteretic Behavior And Seismic Reduction Performance Of Viscous Damping Energy Dissipation Coupling Beams

In recent years,high-rise building structures have increasingly emerged and become the main development trend of urban architecture.As the main anti-side force component of high-rise buildings,the shear wall,where the coupling beams usually undergo brittle failure under earthquake,greatly reduces the energy dissipation capacity of the coupling beams.In addition,it is difficult to repair the coupling beam after damage,and the repair cost is relatively high.In order to improve the energy dissipation capacity of the coupling beam,this paper proposes to apply the viscous damper to the coupling beam to form a structural form of viscous damping energy dissipating coupling beam(hereinafter referred to as viscous damping coupling beam).The viscous damper has the advantages of strong energy dissipation capacity and stable working performance.Under the action of earthquake,the shear deformation of the coupling beam is transformed into the relative displacement at both ends of the viscous damper,so as to fully exert the energy dissipation and damping effect of the damper and reduce the wall damage.The specific research contents of this article are as follows:First,combining the deformation and stress characteristics of coupling beams,the structure of the viscous damping coupling beam with vertical arrangement of the damper and the structure of the viscous damping coupling beam with horizontal arrangement of the damper with T-shaped lever device were designed.The working principle of the viscous damping coupling beam was introduced,and the formula for calculating the displacement amplification factor of the T-shaped lever device for the displacement of the loading end was derived.In order to obtain a floor slab type suitable for viscous damping coupling beams,two different types of floor slabs were considered in the experiment.Aiming at the characteristic that the viscous damper is a velocity-type damper,a dynamic cyclic loading system was designed to test the dynamic mechanical performance of the viscous damping coupling beam.Secondly,the dynamic and cyclic loading tests of the viscous damping coupling beam specimens with vertical and horizontal arrangement of the damper under different displacements and frequencies were performed.The crack development law of different types of floor slabs was recorded,and the changes in the crack width and the steel bar strain of different types of floor slabs were compared.The variation rules of the coupling beam corner-shear relationship curve and the viscous damper hysteresis curve of the viscous damping coupling beam specimens with two types of damper arrangements under different loading displacements and frequencies were analyzed.The amplification effect of the T-shaped lever device on the displacement of the loading end was verified through experiments.By comparing the positive and negative displacement of the damper and the energy dissipation of the specimens in two types of viscous damping coupling beam structures,it was proved that the T-shaped lever can increase the working displacement of the damper and also increase the energy consumption of the damper.Finally,the traditional nonlinear shear wall model and the shear wall model with viscous damping coupling beam were established using the structural nonlinear analysis software PERFORM-3D,and an elastoplastic time history analysis was performed on the established numerical model.The effects of damping coefficient and damper index on the damping effect of viscous damping coupling beam under frequent,basic,and rare earthquakes were discussed.Four schemes for the arrangement of viscous damping coupling beams at different floor locations were given,and the seismic reduction effects of each scheme were compared.The research results show that: with the proper selection of damping coefficient and damping index,the shear wall structure using viscous damping coupling beams can effectively control the seismic response of the structure,slow down the structure vibration,and improve the damage to the lower limbs.Reasonable selection of the damping coefficient and damping index of the viscous damping coupling beam can achieve the best shock absorption effect.The four layout schemes of viscous damping coupling beams have their own advantages.In scheme two,the way of arranging viscous damping coupling beams on the middle floors of the structure has the best effect on controlling the displacement of the structure apex and the damage of the wall limbs.At the same time,it also has a good control effect on the structural base shear force and peak peak acceleration.