Floor Framing by Veu92qx4

VIEWS: 41 PAGES: 33

									Floor Framing
Grimsby Secondary School
Floor Framing Design

Factors affecting Design of Floor System:
• Load (weight of material)
• Size of members
• Spacing of joists
• Beams or bearing walls
• Stress Design Criteria (How joists are
  sized for proper span)
• Deflection
Floor frame consists of

   * Girders (Beams)
   * Posts or columns
   * Sill plates
   * Joists
   * Bridging
   * Subflooring
Floor Framing
GIRDERS
• Larger principle beam made of steel or wood supported
  by posts/columns or piers which support the floor joists
• Can be recessed into foundation wall
             Joists will set on top of girder
• Can sit on top of foundation wall
             Joist will hang off side with Joist Hangers
JOISTS SITTING ON GIRDER
RECESSED GIRDER
JOISTS HANGING FROM GIRDER
GIRDER COLUMN
Types of Girders (Beams)

      •Solid lumber
      •Glue-laminated (GluLam)
      •Composite beams
         •Parallam (PSL)
         •Micro-Lam (LVL)
         •Steel I-Beams
LVL - Laminate Veneer Lumber
PSL - Parallel Strand Lumber
Steel I-Beam Girder
Sills


        • Often called Sill plates or Mudsills
        • Provide bearing for floor joists
        • Sill is attached with anchor bolts.
        • Spacing of bolts is determined by OBC
          Ontario Building Code
SILL PLACEMENT
SILL IS FLUSH WITH GIRDER
FLOOR JOISTS
    • Series of parallel support beams which
    support floor loads and
      which are supported by Girders, or bearing
    walls.

    • Types
        • Solid Dimensional lumber (2x __)
        • Wood I-beams
        • Open Web Floor Truss
        • Steel Joists
        • Structural Insulated Panels (SIP)
DIMENSIONAL LUMBER
DIMENSIONAL LUMBER
CANTILEVERED JOISTS
WOOD I-BEAMS
   • Structural, load-carrying I-joists used in
     residential and light commercial construction.
   • Composition
       •The flange material for I-joists is typically
         dimension lumber or laminated veneer
         lumber (LVL)
       • The web is plywood or OSB.
       • The "I" configuration provides high
          bending strength and stiffness
          characteristics.
WOOD I-JOISTS
STEEL FLOOR JOISTS
Open Web Joists
FLOOR JOIST LAYOUT
FLOOR JOIST LAYOUT
FLOOR JOIST LAYOUT
RIM JOIST
Bridging Dimensional Lumber
  • Joists have a tendency to sway and deflect over long
    spans
  • Bridging stiffens flooring
  • Types:
      • Solid Horizontal bridging
      • Cross bridging
  • Span greater than 10' have at least 1 row
  • Span greater than 14-16' have 2 rows of bridging,
    5-8 feet apart
CROSS BRIDGING
SUBFLOORING
• Thanks for watching

								
To top