Antiseismic support

Abstract

The present invention concerns an anti-seismic support for supporting a construction engineering structure, which comprises a support ( 14 ) having a concave sliding surface ( 17 ) and a sliding block ( 16 ) with a convex sliding surface ( 16 d) in sliding contact with the concave sliding surface ( 17 ), the sliding block ( 16 ) being capable of sliding with pendulum motion relative to the concave surface ( 17 ) in response to an earthquake tremor or shock, the device ( 11 ) comprising a sliding material ( 19 ) between the concave sliding surface ( 17 ) and the convex sliding surface ( 16 b ), where the friction coefficient between the sliding surfaces ( 16 b, 17 ) is above 10% when the device ( 11 ) is loaded with a pressure above 30 MPa and the sliding surfaces are caused to slide at a sliding speed of more than 50 mm/s at a temperature of 20° C. or more.

1 . An antiseismic device ( 11 ) for supporting a civil or construction engineering structure, said device ( 11 ) comprising a first support ( 14 ) having a concave sliding surface ( 17 ) and a sliding block ( 16 ) having a convex sliding surface ( 16   d ) in sliding contact with said concave surface ( 17 ), wherein said sliding block ( 16 ) is capable of sliding with pendulum motion relative to said concave sliding surface ( 17 ) in response to an earthquake tremor or shock, the device ( 11 ) comprising a sliding material ( 19 ) that forms one of:
 said concave sliding surface ( 17 ) and   said convex sliding surface ( 16   b ),   wherein the coefficient of friction between said sliding surfaces ( 16   b,    17 ) is above 9% when the average pressure between said sliding surfaces ( 16   b,    17 ) is 30 MPa or more and the sliding surfaces ( 16   b,    17 ) are caused to slide at a sliding speed of 50 mm/s or more at a temperature of 20° C. or more,   said sliding material ( 19 ) comprising a polymeric material filled with a polymeric, synthetic, ceramic or metal filler, wherein if the the sliding material ( 19 ) undergoes the test defined by the Standard EN15129:2009, Section 8.3.1.2.5 for antiseismic bearing devices for buildings or the test defined by the US Standard “AASHTO LRFD Bridge Design Specification”, Section 15.10.1.2, it exhibits less than 1.0 mm thickness reduction at the end of the test.   
     
     
         2 . A device ( 11 ) as claimed in  claim 1 , wherein said polymeric material is PTFE. 
     
     
         3 . A device ( 11 ) as claimed in  claim 1 , characterized in that the filler is a metal only filler and comprises bronze. 
     
     
         4 . A device ( 11 ) as claimed in  claim 3 , wherein the metal filler comprises bronze only. 
     
     
         5 . A device ( 11 ) as claimed in  claim 1 , wherein the metal filler is from 30% to 60% by weight of said sliding material ( 19 ). 
     
     
         6 . A device ( 11 ) as claimed in  claim 1 , wherein the sliding material ( 19 ) has a thermal conductivity of more than 0.50 W/m*K. 
     
     
         7 . A device ( 11 ) as claimed in  claim 1 , wherein friction between said sliding surfaces ( 16   b,    17 ) is less than 7%, when the mutual sliding speed of the sliding surfaces ( 16 ,  17 ) is less than 10 mm/s and the contact pressure between the sliding surfaces ( 16   b,    17 ) applied to the device ( 11 ) is at least 20 MPa. 
     
     
         8 . A device ( 11 ) as claimed in  claim 1 , wherein in an oscillation test of said device ( 11 ) in which the sliding speed between said sliding block ( 16 ) and said first support ( 14 ) is at least 200 mm/s, the oscillation amplitude is at least 70% of the maximum admissible oscillation permitted by the device ( 11 ) and the nominal load is applied, during the third oscillation cycle the coefficient of friction between the concave and convex sliding surfaces ( 16   b,    17 ) of the device ( 11 ) is 10% or more. 
     
     
         9 . A device ( 11 ) as claimed in  claim 1 , wherein in an oscillation test of said device ( 11 ) in which the sliding speed between said sliding block ( 16 ) and said first support ( 14 ) is at least 400 mm/s, the oscillation amplitude is at least 70% of the maximum admissible oscillation permitted by the device ( 11 ) and the nominal load is applied, during the third oscillation cycle the coefficient of friction between the concave and convex sliding surfaces ( 16   b,    17 ) of the device ( 11 ) is 10% or more. 
     
     
         10 . A device ( 11 ) as claimed in  claim 1 , wherein the sliding material ( 19 ) is mounted to the sliding block ( 16 ) either as a sheet partially embedded in a corresponding seat formed on the sliding block ( 16 ), or as a sheet applied using an adhesive or mechanical fastening means and forms the convex sliding surface ( 16   b ) of the sliding block ( 16 ). 
     
     
         11 . A device ( 11 ) as claimed in  claim 1 , wherein the sliding material ( 19 ) has a softening temperature above 250° C.