Composite floor system

Abstract

The present invention concerns a framing system for a composite concrete floor, the framing system comprising horizontally extending primary framing members supporting secondary framing members across the primary framing members. Each of the secondary framing members has two opposite ends provided with a shear shoe fixed to the primary framing members by means of a structural joint sufficient to provide a shear connection between the concrete floor and the primary framing members. Thanks to these shear shoes, the framing system of the invention has an increased resistance to horizontal shear forces as compared to prior art concrete floor systems.

What is claimed is:  
     
         1 . A framing system for a composite concrete floor, the framing system comprising horizontally extending primary framing members supporting secondary framing members across the primary framing members, said primary and secondary framing members being made of a metallic structural material, each of said secondary framing members having two opposite ends provided with a shear shoe, said shear shoe being fixed to said primary framing members by means of a structural joint sufficient to provide a shear connection between said concrete floor and said primary framing members.  
     
     
         2 . A framing system as defined in  claim 1 , wherein said shear shoes of each secondary framing member comprise an iron angle having: 
 one horizontally extending face fixed by means of said structural joint to a horizontal face of a respective one of said primary framing members, and    one vertically extending face fixed to said secondary framing members.    
     
     
         3 . A framing system as defined in  claim 2 , wherein said structural joint is selected from the group consisting of a weld joint and a bolt joint.  
     
     
         4 . A framing system as defined in  claim 3 , wherein said structural joint is a weld joint.  
     
     
         5 . A framing system as defined in  claim 1 , wherein said secondary framing members have continuous shear connection to the concrete floor.  
     
     
         6 . A framing system as defined in  claim 5 , wherein said secondary framing members have a top chord embedded in the concrete floor, thereby providing said shear connection to the concrete floor.  
     
     
         7 . A framing system as defined in  claim 1 , wherein said primary framing member is a truss.  
     
     
         8 . A framing system as defined in  claim 1 , wherein said primary framing member is a steel beam.  
     
     
         9 . A framing system as defined in  claim 8 , wherein said secondary framing members are open-web steel joint.  
     
     
         10 . A framing system as defined in  claim 1 , wherein said metallic structural material is steel.  
     
     
         11 . A method of erecting a framing system for a composite concrete floor comprising the steps of: 
 providing primary and secondary framing members made of a metallic structural material, each of said secondary framing members having two opposite ends provided with a shoe;    placing said primary framing members in parallel relation;    placing said secondary framing members transversally between said primary framing members with said shoes bearing on the primary framing members; and    fixing said shoes to said primary framing members with a structural joint sufficient to provide a shear connection for said primary framing members.    
     
     
         12 . A method as defined in  claim 11 , wherein said step of fixing consists of welding said shoes to the primary framing members.  
     
     
         13 . A method as defined in  claim 11 , wherein said secondary framing members have a continuous shear connector.  
     
     
         14 . A method as claimed in  claim 13 , wherein said shear connector is a continuous top chord adapted to be embedded in said concrete floor.