Presentation on theme: "Grimsby Secondary School"— Presentation transcript:
1Grimsby Secondary School Floor FramingGrimsby Secondary School
2Floor Framing Design Factors affecting Design of Floor System: Load (weight of material)Size of membersSpacing of joistsBeams or bearing wallsStress Design Criteria (How joists are sized for proper span)Deflection
3Floor frame consists of * Girders (Beams)* Posts or columns* Sill plates* Joists* Bridging* Subflooring
5GIRDERSLarger principle beam made of steel or wood supported by posts/columns or piers which support the floor joistsCan be recessed into foundation wallJoists will set on top of girderCan sit on top of foundation wallJoist will hang off side with Joist Hangers
18FLOOR JOISTSSeries of parallel support beams which support floor loads andwhich are supported by Girders, or bearing walls.TypesSolid Dimensional lumber (2x __)Wood I-beamsOpen Web Floor TrussSteel JoistsStructural Insulated Panels (SIP)
22WOOD I-BEAMS Structural, load-carrying I-joists used in residential and light commercial construction.CompositionThe flange material for I-joists is typicallydimension lumber or laminated veneerlumber (LVL)The web is plywood or OSB.The "I" configuration provides highbending strength and stiffnesscharacteristics.
30Bridging Dimensional Lumber Joists have a tendency to sway and deflect over longspansBridging stiffens flooringTypes:Solid Horizontal bridgingCross bridgingSpan greater than 10' have at least 1 rowSpan greater than 14-16' have 2 rows of bridging,5-8 feet apart