A reinforcement system and a method of reinforcing a structure with a tendon

Abstract

A structure ( 30 ), such as a concrete structure, with a reinforcement system configured for anchoring tendons ( 40 ) for structurally reinforcing the structure ( 30 ), said reinforcement system comprising at least one tendon ( 40 ) and at least two anchorages ( 10 ), said least one tendon ( 40 ) having a first end and a second end, said first end of the at least one tendon ( 40 ) being structurally connected to the structure ( 30 ) by said at least two anchorages ( 10 ), each of said at least two anchorages ( 10 ) comprising an anchor ( 15 ), said anchors ( 15 ) being positioned successively at different positions along the length of said first end of said at least one tendon. Each of said two or more anchorages ( 10 ) comprises an anchorage block ( 11 ), in said anchorage block ( 11 ) is attached to the structure ( 30 ), and said anchorage block ( 11 ) accommodates said anchor ( 15 ).

1 . A concrete structure with a reinforcement system configured for anchoring tendons for structurally reinforcing the structure, said reinforcement system comprising:
 at least one tendon; and   at least two anchorages, said at least one tendon having a first end and a second end, said first end of the at least one tendon being structurally connected to the structure by said at least two anchorages, each of said at least two anchorages comprising an anchor, said anchors being positioned successively at different positions along the length of said first end of said at least one tendon, each of said two or more anchorages comprising an anchorage block attached to the structure, and accommodating said anchor.   
     
     
         2 . The structure with a reinforcement system according to  claim 1 , wherein each of said at least two anchorages comprises a ductility element, said ductility element having a first end abutting said anchorage block and a second end abutting said anchor, said ductility element comprising between its first end and its second end weakened deformation zones being deformable and thereby allowing the length of deformation zones on the ductility element to increase or decrease in an axial direction along the length of said at least one tendon, when the stress on the ductility element exceeds a certain level, the ductility element comprising weakened deformation zones being weaker than the other components of the reinforcement system, the ductility element being adapted to deform before the other components of the reinforcement system. 
     
     
         3 . The structure with a reinforcement system according to  claim 1 , wherein said at least two anchorages comprises a ductility element, said ductility element is positioned in structural connection, between said at least one tendon and said anchors, said ductility element comprising weakened deformation zones being deformable and thereby allowing the length of deformation zones on the ductility element to increase or decrease in an axial direction along the length of said at least one tendon, when the stress on the ductility element exceeds a certain level, the ductility element comprises weakened deformation zones being weaker than the other components of the reinforcement system, the ductility element being adapted to deform before the other components of the reinforcement system. 
     
     
         4 . The structure with a reinforcement system according to  claim 1 , wherein said reinforcement system comprises two or more ductility elements adapted to deform at different axial loads. 
     
     
         5 . The structure with a reinforcement system according to  claim 1 , wherein said ductility elements are adapted to deform at loads being about 30-95%, preferably 70-95% of the stress required for rupturing of said at least one tendon. cm  6 . The structure with a reinforcement system according to  claim 1 , wherein the ductility element is an integrated part of said anchor. 
     
     
         7 . The structure with a reinforcement system according to  claim 1 , wherein said anchorage block comprises a tightening assembly adapted to adjust the tensioning of the at least one tendon relative to the anchorage block. 
     
     
         8 . The structure with a reinforcement system according to  claim 1 , wherein said anchorage block comprises a recess in the longitudinal direction of the anchorage block, the recess adapted to accommodate at least part of the tightening assembly, a part of the at least one tendon, the ductility element and at least partly the anchor. 
     
     
         9 . The structure with a reinforcement system according to  claim 1 , wherein said anchor comprises a barrel having a tapered interior bore and a compressible wedge adapted to be disposed in said barrel. 
     
     
         10 . The structure with a reinforcement system according to  claim 1 , wherein the reinforcement system comprises additionally at least two or more anchorages adapted for anchoring said second end of the at least one tendon, said second end of the at least one tendon structurally connected to the structure by said additionally at least two anchorages . 
     
     
         11 . The structure with a reinforcement system according to  claim 1 , wherein the at least one tendon comprises fiber-reinforced polymer (FRP), including carbon, aramid, or glass fiber reinforced polymer. 
     
     
         12 . A method of reinforcing a structure with at least one tendon and a reinforcement system, the method comprising:
 fixing at least two anchorages to a first end of the at least one tendon, said at least one tendon being connected to each anchorage successively,   mounting said at least two anchorages to the structure,   attaching at least two anchorage blocks to the structure,   fixing two or more sets of a ductility element followed by an anchor subsequently onto the first end of the at least one tendon, the two or more ductility elements and anchors positioned subsequent in an axial direction along the length of said at least one tendon, and   positioning said two or more sets of ductility elements and anchors into the recesses of the at least two anchorage blocks.   
     
     
         13 . The method of reinforcing a structure with at least one tendon according to  claim 12 , the method further comprising:
 placing a ductility element at the first end of the at least one tendon in structural connection to each of said at least two anchorages.   
     
     
         14 . The method of reinforcing a structure with at least one tendon according to  claim 12 , further comprising the step of:
 adjusting the tightening assemblies for adjusting the tensioning of the at least one tendon relative to the anchorage block.   
     
     
         15 . The method of reinforcing a structure with at least one tendon according to  claim 13 , further comprising:
 adjusting the tightening assemblies for adjusting the tensioning of the at least one tendon relative to the anchorage block.