ESR-2408 - ASC Steel Deck, A Division of ASC Profiles Inc. - ladbs
ESR-2408 - ASC Steel Deck, A Division of ASC Profiles Inc. - ladbs
ESR-2408 - ASC Steel Deck, A Division of ASC Profiles Inc. - ladbs
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<strong>ESR</strong>-<strong>2408</strong> | Most Widely Accepted and Trusted Page 33 <strong>of</strong> 42CONCRETE TYPE 7f’ c = 3,000 PSITABLE 11—ALLOWABLE DIAPHRAGM SHEARS FOR TYPES B, BF, BR, N, NF, NR2W, 2WF, 3W AND 3WF DECKS WITH CONCRETE FILL AND SHEAR STUDS 1-9 (plf)CONCRETESPACING OF SHEAR STUDS 9THICKNESS 8 16” 18” 24” 32”NW 2 – 2 1 / 2” 4,730 4,530 3,400 2,550LW 2 – 2 1 / 2” 4,350 3,860 2,900 2,180LW 3 – 3 1 / 4” 4,350 3,860 2,900 2,180For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 plf = 14.594 N/m, 1 pcf =16.018 kg/m 3 , 1 psf = 47.88 Pa, 1 psi = 6894 Pa,1 lbf = 4.45 N, 1 kip = 4.45 kN.1 Values must not exceed 1990 plf for 2 1 / 2 inch normal-weight concrete slabs, 1,900 plf for 2 1 / 2 inch structural lightweight concreteslabs, and 2,200 plf for 3 1 / 4 inch structural lightweight concrete slabs, unless mesh having an area <strong>of</strong> 0.0025 times the gross area <strong>of</strong>concrete is used. Six by six – W4 x W4 meets this requirement for 2 1 / 2 inch slabs and 4 x 4 – W4 x W4 qualifies for 3 1 / 4 inch slabs.2 Stud diameter must not exceed 2.5 times the thickness <strong>of</strong> the steel support, unless stud is located directly over support web.3 See Figures 1 and 7 for qualifying deck types and weld patterns.4 For local shear transfer within the field <strong>of</strong> the diaphragm, 1 / 2 inch-diameter studs having shear values <strong>of</strong> 6.8 kips per stud fornormal-weight concrete fills and 5.8 kips per stud for lightweight concrete, except as noted hereafter, shall be used. For <strong>Deck</strong> TypesB-36 and BF-36, where the width <strong>of</strong> concrete at the stud is less than 2.25 inches, values <strong>of</strong> 5.7 kips and 4.9 kips, respectively, mustbe used. For <strong>Deck</strong> Types N-24 and NF-24, where the width <strong>of</strong> concrete at the stud is less than 4.5 inches, 3 / 4 inch –diameter studswith values <strong>of</strong> 3.5 kips and 3.0 kips, respectively, must be used.5See Table 19 for Diaphragm Flexibility Limitations.6 Standing seam sidelaps <strong>of</strong> decks must be fastened by button punches at 36 inches on center. Nestable seams must be fastenedusing either No. 12 self-tapping screws or 1 1 / 2 inch–long fillet welds at 36 inches on center.7 NW = Normal weight (145 pcf). LW = structural lightweight (110 pcf).8 Concrete thickness, t f, is measured from top flute <strong>of</strong> metal deck.9 <strong>Deck</strong> Types B-36, BF-36, BR-35, 2W36 and 2WF36, identified in Figure 1, require 1 / 2 inch –diameter studs minimum. Five-eighthsinch-diameterstuds minimum are required for <strong>Deck</strong> Types NR-24, 3W36 and 3WF36. For <strong>Deck</strong> Type N-24 and NF-24, 3 / 8-inchdiameterstuds minimum are required and the tabulated shears must be reduced by a factor <strong>of</strong> 0.74.SHEAR STUDS AT SUPPORTSPERPENDICULAR TO FLUTESSHEAR STUDS AT SUPPORTSPARALLEL TO FLUTESTYPICAL EXTERIOR OR INTERIORSHEAR TRANSFER STUDSFIGURE 7—SHEAR STUD DETAILS