Typically, provided by headed shear studs. INSERT INFORMATION: STRENGTH OF FULLY COMPOSITE BEAM SECTION CALCULATIONS Handout on Calculations: Full圜ompositeCalcs.PDF Composite Beam Theoryġ7 Flexural Strength The bare steel section must support the temporary construction loads (before the concrete has set), or the steel beam must be shored until the composite section is effective. In general, strength is controlled by Mp. Local Flange Buckling is minimized by the slab. Lateral Torsional Buckling is prevented by the slab (continuous bracing). Partially Composite: The force transfer between the slab and beam is limited by the connectors. Composite Beam Theoryįully Composite: The strength of either the floor slab in compression or the steel beam in tension is transferred at the interface. Negative Moment It typically is assumed that the concrete carries no tensile forces and reinforcement is minimal, therefore strength is identical to a bare steel section. The strength is determined as the plastic stress distribution on the composite section. Metal Decking Slides Shear Studs Slides Composite Beam Theoryġ2 Flexural Strength Composite Beam Theory Nelson Headed Studs web pages Steel Deck Manufacturer Catalogs These can be found on-line Composite Beam Theoryġ0 Typical Framing Column Girder Beam Slab/Deck Span PLANġ1 INSERT PHOTOS: AISC Four Story Office Building Photo Slide Shows
Hr = height of deck tc = thickness of concrete above the deck Composite Beam Theory 7 7Ĩ A A Metal Deck Slab - Ribs Perpendicular to Beam Span beff hr tcĩ REFERENCES: COMPOSITE BEAMS Steel Deck Institute web pages Composite Beam Theoryīeff = effective width of the slab Function of: Span length Distance to nearest beam Distance to edge of slab beff beff s3 edge s1 s2 edge Composite Beam TheoryĦ Flat Soffit Slabs beff ts, slab thickness Composite Beam Theoryħ A A Metal Deck Slab - Ribs Parallel to Beam Span beff hr tc Flat Soffit Slabs – typically, older construction. Metal deck serves as construction platform. Metal deck serves as positive reinforcement. Composite Beam Theory 3Ĥ Slabs Composite Metal Deck Slabs – most commonly used today.Īdvantages: Stay in place form. Non-Composite Slip at Interface Two Neutral Axes Mn= Mnconcrete+Mnsteel I = Iconcrete + Isteel Fully Composite Assumed no slip at Interface One Neutral Axes Mn > Mnconcrete+Mnsteel I > Iconcrete+Isteel Shear at interface transferred by shear connectors. Advantages over non-composite design: Increased strength Increased stiffness For given load conditions can achieve: Less steel required Reduced steel depth Composite Beam Theoryģ Composite Behavior c T T c c NA NA Concrete Composite T NA Steel Teaching Modules for Steel Instruction Advanced Flexure Design COMPOSITE BEAM THEORY SLIDES Developed by Scott Civjan University of Massachusetts, Amherst Composite Beam TheoryĢ Composite Beams Composite action accounts for the steel beam and floor slab working together to resist bending moments. 1 Advanced Flexure Design COMPOSITE BEAM THEORY SLIDES
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