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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.
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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
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
Types of Girders (Beams) • Solid lumber • Glue-laminated (GluLam) • Composite beams • Parallam (PSL) • Micro-Lam (LVL) • Steel I-Beams
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
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)
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.
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