Study On The Damping Effect Of Concrete Filled Steel Tube Frame Shear Wall Structure With Viscous Damper

Concrete filled steel tube composite column frame shear wall structure system is a new type high-rise steel structure housing system,whose force is complex and frame shear coordination mechanism is unclear,its seismic performance needs to be improved.In view of these deficiencies,adding viscous damper in the structure and using damper's hysteretic deformation to consumpt seismic energy,which can effectively improve anti-seismic performance and increase anti-seismic line.In this paper,using fast nonlinear(FNA)analysis of the finite element software SAP2000,systematic studied damping performance of viscous damper on CFST composite column frame shear wall structure.The main contents are as follows:(1)By setting the ordinary eccentric bracing,two kinds of viscous damper energy dissipation braces and unsetting braces in 81 m CFST composite column frame shear wall structure,bulid four structural models whose seismic response parameter is compared and analysed under the action of different seismic waves.The results show: The effect of energy dissipation of viscous damper under frequent earthquakes is obvious,and it does not provide additional rigidity,ordinary eccentric support damping effect is not obvious,and increase the overall stiffness of the structure,so that part of the floor of the seismic response increases;In addition viscous damper through the herringbone connection can get greater deformation,compared to oblique connection,its hysteresis curve is more full,absorbs more seismic energy,and damping effect is superior.(2)By setting viscous damper herringbone dissipation brace in different layouts in the 81 m structure,compared damping effect and economic benefit of the different schemes under the frequent and rare earthquakes.The study shows: The damping effect of energy dissipation brace arranged in the structure of 1,7,13 axis and 4,10 axis is similar,but the dampers amount of the latter is less and economic benefits is obvious;In this structure,the setting energy dissipation braces in each floor is the best,and the second is in the 14-27(upper half)floor,the third is the interlayer layout,while in the 1-14 floor(lower half)and in the 21-27 floor is similar,whose damping effect are poor;Under the action of frequent earthquakes,the viscous dampers have obvious energy dissipation effect,and all the schemes have obvious damping effect,under rare earthquakes,the energy dissipation effect of the viscous damper is weakened,and the damping effect of each scheme declines in different degrees.(3)By setting viscous damper energy dissipation brace in the CFST composite column frame shear wall structure with different depth-width ratio(99m).Under the action of frequent and rare earthquakes,the damping effect of different schemes is compared.As the depth-width ratio increases,the damping effect of each scheme decreases.The damping effect of each floor setted is the best,and the damping effect of interlayer and 17-33(upper half)setted is close.