Design And Experimental Research Of Viscous Damper Based On Porous Media

Viscous damper is a kind of speed dependent seismic energy absorber,withgood absorbing ability and no static stiffness, which have been widely used inanti-seismic civil engineering such as high-rise buildings, large-span structures,bridge structures and important buildings for dissipating seismic energy. But mainkind of energy dissipation structure of traditional viscous dampers are straight flowchannels, the speed exponent of damper is uneasy to be designed. In order toconveniently adjust and controll speed exponent, a new kind of Viscous damperwhich based on porous media has been proposed in this paper. A large number ofexperiment has been researched to study performance characteristics of damperbased on porous media and the rationality of the damping force model. The maincontents of this paper are as follows:(1) Based on average hydraulic radius model and contracting-expandingchannel model of fluid dynamics in porous media, the damping force model ofdamper based on porous was modified. Analyzed different performances betweenporous-media damper and straight-capillary damper.(2) By changing kinetic viscosity of damping medium and diameter of particlesin paced bed, more than130mode of the performance experiment have been tested.Proofed the damping force model of porous-media viscous damper; Analyzed thetrends of flow exponent and viscous damper coefficient with increasing loadingvelocity; Using viscous coefficient and speed exponent as an evaluation standard,compared the performance of porous-media damper and straight-capillary damperthen analyzed the reason causing that difference.(3) Combined with the damping force model and experimental conclusions,briefly described the design method of viscous dampers, which based on porousmedia.