Composite Construction

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Composite Construction Detail of shear connectors

Composite Construction PNA in steel PNA in concrete b b Ycon Ycon a C = Ccon+Cst Tst C=T Mn = Cy = Ty b b a C con Ycon y Tst

Composite Construction Ccon = 0.85f’cba T = FyAs Ccon and T can not exceed force carried by studs, ∑Qn ∑Qn =0.85 f’cba Depth of compression block

Composite Members Specification p. 16.1-40 I3 Flexural Members Effective Width, b, sum of effective widths for each side of beam center-line, each of which shall not exceed: 1) 1/8 of beam span 2) ½ distance to center-line of adjacent beam 3) distance to edge of slab b b b

Composite Members Specification p. 16.1-40 I3 Flexural Members (cont.) Design Strength of Beams with Shear Connectors - Strength During Construction Formed Steel Deck 5a. General hr ≤ 3” wr ≥ 2” shear stud diameter ≤ ¾” shear studs must extend 1½ -in. above top of deck Slab thickness must be ≥ 2” above steel deck

Composite Members Specification p. 16.1-40 I3 Flexural Members (cont.) Formed Steel Deck 5b. Deck Ribs Perpendicular to Steel Beam Max shear stud spacing 36 in. Shear stud strength reduction factor – eq. I3-1 ≤0.75 if only single stud in rib Deck must be anchored every 18 in. 5c. Deck Ribs Oriented Parallel to Steel Beam Shear stud strength reduction factor – eq. I3-2 applied if wr/hr ≤1.5 Design Shear Strength

Composite Members Specification p. 16.1-40 I5 Shear Connectors – shear studs or channels Length shear studs, Hs ≥ 4 stud diameters - Strength of Stud Shear Connectors Eq. I5-1 modified by reduction factors Required Number of Connectors

Composite Members Specification p. 16.1-40 I5 Shear Connectors – shear studs or channels Required Number of Connectors – Number required must be provided from section of maximum bending moment to adjacent section of zero moment. Shear Connector Placement and Spacing Stud diameter ≤2.5 tf (prevent tear out) Minimum spacings ribs parallel: longitudinal – 6 x stud diameter transverse – 4 x stud diameter ribs perpendicular: 4 x stud diameter (long. and trans.) Maximum spacing 8 x slab thickness

Composite Construction p.5-33 Effective concrete flange force (∑Qn) Y1 – Distance from PNA to beam top flange Y2 – Distance from concrete flange force to beam top flange b – effective width of concrete slab flange a – effective concrete flange thickness b Ycon a Y2 Y1 PNA

Composite Design Example p. 39 notes Redesign the floor system previously designed (example p. 33), using composite construction. A992 steel and 3500 psi concrete.