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Effective Use of the New SDI Roof Deck Design Manual
Presenter: Michael Martignetti, PE, LEED AP BD+CEngineering ManagerCanam Buildings
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Referred to as “RDDM” in Presentation
Basis of Presentation
Available for Purchase at www.sdi.org
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What is Roof Deck??• Encloses Building from Wind• Provides Fire Resistance as Part of UL Assembly• Structural Base of Roof Membrane• Resists Dead, Snow, Roof Live, Seismic and Wind Loads• Transfers Wind and Seismic Loads to Vertical Components of Lateral Force Resisting Systems through Diaphragm Action
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Typical Roof Assemblies
Roof Deck Not Intended to Be Watertight in Any Circumstance!!
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Manufacturing Roof Deck
COILS
LINE 1
LINE 3
LINE 2
OVERHEAD CRANE
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Steel Coils
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Steel Properties
ASTM A1008 – Cold Rolled Steel
ASTM A653 – Galvanized Steel(ASTM A924 – Zinc Coating)
Fy minimum = 33 ksiFu minimum = 45 ksi
Typical Gages for Roof Deck – 22 gage thru 16 gage
Actual Steel Thickness to be at Least 95% of Design Thicknessi.e. 22 gage – (0.0295” Design x 0.95 = 0.028” Minimum)
AISI S100 Sections A2.1 and A2.2
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Fy = 85.9 ksiFu = 88.7 ksi
Steel Properties
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Roll Forming
‐ Load Coil‐ Line Up Steel In Roll Former‐ Roll Form
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Roll Forming
‐ Shear‐ Stack‐ Bundle‐ Ship
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Standard Roof Deck Types
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B Deck[Wide Rib (WR) Deck]
N Deck[Deep Rib (DR) Deck]
Most Common Roof Decks1 ½” and 3” Options
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F Deck[Intermediate Rib (IR) Deck]
A Deck[Narrow Rib (NR) Deck]
Other Options for 1 ½” DeckNarrower Low Ribs for Thin Insulation Scenarios
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Long Span Roof Deck
•Used to Span Longer Distances and/or Carry Heavier Loads• Made By Some Deck Manufacturers Although Profiles Vary
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Cellular Roof Deck
• Flat Panel Welded or Mechanically Attached to Bottom of Profile• Flat Appearance from Underside• Can Span Longer Distances and/or Carry Heavier Loads
Available in 1 ½”, 3”, 4 ½”, 6” and 7 ½” By Some Manufacturers (3” Shown)
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Acoustic Deck
Field Installed Acoustic Batts Shop Installed Acoustic Batts
Standard Cellular
‐ Perforations in Deck Allow Sound to Pass Through and Be Absorbed by Fiberglass Batts‐ Reduces Sound Reverberation (Echo)‐ Does Not Prevent Sound Passing Through Floor or Provide R Value
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Noise Reduction Coefficient‐Measure of Performance for Acoustic Deck‐ Performance is a Function of Roof Assembly – Deck + Batts + Built Up Insulation‐Most Tests Based on 2” Poly‐Isocyanurate Built Up Roofing (Most Common)‐ Reduction of Reverberation‐ Deck Tested At Multiple Frequencies‐ NRC Obtained By Averaging Results of 250, 500, 1000 and 2000 Hz
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• Prime Paintedo Cold Rolled (CR) Substrate (Bare Steel)o Typically Available in Gray or Whiteo Provisional Coating (Approx 0.3 mil Thickness)o Applied Via Industrial Coating Line
• Galvanizedo G60 and G90 Most Common
• Galvanized + Primero Provisional Gray or White Primer (Same as CR)o Allows for Easier Adhesion of Field Paint
Deck Finishes
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Galvanized Coatings
Heavier Coatings Available Although Not Common for Buildings
G165 or G235 Coatings Common for Bridge Form Applications
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Design References
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Non effective area (positive bending)
Properties
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Properties
Fy = 33 ksi, Fu = 45 ksiP = Positive bendingN = Negative bending
C3.1.1‐1 Mn = SeFy
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Loads
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Vertical LoadsDownwardUpwardsConcentratedShear Web Crippling
Lateral LoadsCompressionDiaphragm
3N2012’ span
Loads
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One Span+ M = 0.125 wL2 = 0.6 Fy Sp
Two Span+ M = 0.07 wL2 = 0.6 Fy Sp‐M = 0.125 wL2 = 0.6 Fy Sn
Three Span+ M = 0.08 wL2 = 0.6 Fy Sp‐M = 0.10 wL2 = 0.6 Fy Sn
Gravity loads and tables
Δ1 = 22.46 wL4 / (E Ip) < L/240
Δ2 = 9.33 wL4 / (E Ip) < L/240
Δ3 = 11.92 wL4 / (E Ip) < L/240
Capacities, Gravity
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One Span‐M = 0.125 wL2 = 0.6 Fy Sn
Two Span‐M = 0.07 wL2 = 0.6 Fy Sn+ M = 0.125 wL2 = 0.6 Fy Sp
Three Span‐M = 0.08 wL2 = 0.6 Fy Sn+ M = 0.10 wL2 = 0.6 Fy Sp
Capacities, Uplift
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If X < 0.25 be = B + 6” > 12”If X > 0.25 be = B + 18” – 3/X > 24” – 3/X
XL
Example: If L = 12 ft, and XL = 6 ft, and B = 10”X = 0.5be = 10 + 18” – 3/0.5 > 24” – 3/0.5be = 22” > 18”. Use be = 22”
Concentrated Loads
L = SpanX = % of Span
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Capacities, Shear
C3.2.1‐1 Vn = AwFv
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ANSI/SDI‐RD1.0“Deck ends over supports shall be installed with a minimum end bearing of 1 ½” .“
If N < 1 ½”, or high shear loads are expected, the designer should check the deck for web crippling.
Crippling
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WEB YIELDING
FLANGE CURLING
Crippling
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Crippling
Web Yields Flange Curls
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Web YieldsFlange Curls
Crippling
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Capacities, CripplingAllowable Loads
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TFE = 504 plf 504 plf = 300 plf + wL/2
wmax = 34 psf
Capacities, Crippling
3N2012’ span
300 plf curb
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Pn = A ( 1 + B (N)0.5) derived from AISI S‐100 Pa= Pn / ΩPa= 476 ( 1 + 0.74 (1.5)0.5) / 1.8 = 504 plfPa = 476 ( 1 + 0.74 (2.5)0.5) / 1.8 = 573 plfPa = 476 ( 1 + 0.74 (3.5)0.5) / 1.8 = 630 plf
Capacities, Crippling
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Capacities, Axial
C3.4.1‐1 Pn = AeFn
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Capacities, Diaphragm
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Supports• Welds• Screws• Pins (Powder Actuated or Pneumatic)
Fasteners During construction they secure the sheets from sliding
Critical for horizontal (diaphragm) shear loads and/or uplift
Side Laps• Welds• Screws• Button Punches
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Arc Spot Welds(Puddle Welds)
Typical Welding ElectrodesE6022 – 22 gage or ThickerE7014 – Thinner than 22 gage
Sheet Steel Welding AWS D1.3
Weld Washers Only For Gages Less than 22 (Not Including 22 gage)
Per SDI No More Than 1/16” Gap Between Deck and Support
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Mechanical FastenersScrews Pins
• Typical for Attachment to Light Gage Framing• Also Used for Steel Joist or Beam Supports Especially with Fastener Manufacturer Tools
• Draw Deck Down to Supports• No Fire Watch• #10, #12, #14, ¼” Diameters (#12 Most Common)• Drill Points No. 3 thru 5• Performance Based on Specific Manufacturer
Drill Point Max Total Material Thickness3 5/32"4 5/16"5 1/2"
• Powder Actuated or Pneumatic• Quick Installation• No Fire Watch• Performance Based on Specific Manufacturer
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Attachment Patterns(Deck Panel Coverage (inches) / No Fasteners Per Sheet at Each Support)
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Side Lap FastenersWelds
• Puddle or Fillet• Difficult to Make for Lighter Gages• Not Recommended for 22 Gage or Thinner
Screws• Easiest Installation if Horizontal Runout Exists• Visible from Underside
Button Punches• Must Have Interlocking Side Lap• Proprietary Systems Available• Difficult to Make for Heavier Gages
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Uplift / ShearBased on 2007 AISI S100 Design Specification
TensionPnt = 0.8(Fu/Fy)2 x t(d‐t) x Fu (Eq. E2.2.2‐2)
Ω = 2.50 φ = 0.60
ShearPnv = See AISI for Different Cases
(Eqs. E2.2.1.2‐1 thru 4)
Puddle Welds Pins
Consult Specific Pin Manufacturer for Information on Tension and ShearCapacity as These Values are TypicallyBased on Product Testing…
Values for Uplift & Shear of Puddle Welds Found in
Tables 8.1 and 8.2 of RDDM(See Next Slide)
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Uplift / ShearBased on 2007 AISI S100 Design Specification
TensionLesser of Pull‐Out, Pull‐Over and Tensile Capacity of Screw per Screw Manufacturer:
Pull‐OutPnot = 0.85t2dFu2 (Eq. E4.4.1‐1)
Ω = 3.00 φ = 0.50
Pull‐OverPnov = 1.5t1dwFu1 (Eq. E4.4.2‐1)
Ω = 3.00 φ = 0.50
Fu1 and t1 are for Steel Contacting Screw HeadFu2 and t2 are for Steel Engaging Screw Threads
Screws
ShearLesser of Tilting, Bearing and Shear Capacity of Screw per Screw Manufacturer:Pns = See AISI for Different Cases
(Eqs. E4.3.1‐1 thru 5)
Values for Tension, Pull‐Out, Pull‐Over and Shear of
Screws Found in Tables 9.1 thru 9.4 of RDDM
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Diaphragm Shear• Important Design Parameter When Specifying Roof Deck
• Subject of Separate Webinar
• Based on SDI Diaphragm Design Manual‐ 3rd Edition Current‐ 4th Edition Expected Soon
• Important to Remember Interaction of Shear and Uplift
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Available for free download at www.sdi.org. Hard copies available for nominal fee.
Primary Reference for Construction Practices with Steel Deck
SDI Manual of Construction
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Deck Bearing
Ends of Sheets Generally Lap for Nestable Deck
Heavier Gages or Interlocking Deck May Require Butted Ends
SDI Requires at Least 1 ½” Bearing in Strong Direction!!(1/2” Minimum in Weak Direction)
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Accessories
Ridge Plate
Sump Pan
Butt StripValley Plate
Finish Strip
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Spray Fireproofing and UL Paint• SFRM = Spray On Fire Resistive Material• Galvanized Deck Should Generally Be Specified if Deck will Receive SFRM• Specify a UL Approved Primer if Primed Deck is to Receive SFRM• Acoustic Deck CANNOT Receive SFRM•U.L. Approved Paint Has Been Put Through Fire Testing by U.L. to Confirm Adhesion At High Temperatures
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RDDM TablesA good deal of technical data is presented in tables for quick reference.
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Example of Table from RDDM…
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Example of Table from RDDM (cont)
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RDDM ExamplesMany examples are worked through for common calculations that designers face.
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RDDM References
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Questions???
SDI Managing Director – Bob PaulOffice Location – Pittsburgh, PAPhone – (412) 487‐3325Email – [email protected] – www.sdi.org
Get Your Copy Today!!!