Development and Experimental Study of Friction Dampers for Suspension Bridges
The beam end of large-span suspension bridges occurrence frequent reciprocating motion under operating loads,the durability of sliding bearings and expansion joints is reduced due to severe wear and tear.In response to the above problem,the friction damper for the suspension bridges is developed.In order to select suitable wear-resistant friction materials for friction dampers,the wear resistance characteristics of friction material samples are compared and analyzed such as brass,composite brake pads,and high-performance polymers.Large tonnage friction damper specimens using high-performance polymers and stainless steel mirror surfaces as friction pairs are further designed and produced,and mechanical performance tests are carried out.The research results show that,under a positive pressure of 12 MPa,the wear rate of brass and composite brake pad materials is high and the stability is poor,while high-performance polymer materials only show a small amount of debris after 10 000 meters of wear,and there are no obvious wear marks on the worn surface,with a wear rate of 12 μm/km,with good wear resistance;The friction coefficient of high-performance polymers varies slightly with speed within the range of 0.5～11 mm/s,with an average value of 0.174,indicating good stability;The friction damper specimen exhibits obvious Coulomb characteristics within the range of 0.1～377 mm/s,and the deviation between the actual damping force and the design value(752 kN)is not greater than±10％,which can provide relatively stable damping force under different stress states of the suspension bridge.
bridge engineeringsuspension bridgemain beam cumulative displacementfriction damperhigh performance polymerwear-resistanceexperimental study
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