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Steel Deck Diaphragm Calculator

The Steel Deck Diaphragm Calculator provides diaphragm shear strengths of a steel deck when using Simpson Strong-Tie Strong-Drive® screws. The Diaphragm Capacity Tables calculator can be used to develop a table of diaphragm capacities based on the effects of combined shear and tension, or the Optimized Solutions can be used to provide optimized fastening solutions for a given shear and uplift.

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Optimized Solutions

Optimized Solutions

Design and optimize fastening solutions for a steel deck diaphragm.

Diaphragm Capacity Tables

Diaphragm
Capacity
Tables

Develop tables of steel deck diaphragm capacities for a given shear and uplift load.

Manufacturer Specific Information

Other Diaphragm Tables

Access manufacturer specific diaphragm capacity tables and information related to Simpson Strong-Tie Strong-Drive screws.

Steel Deck Information

Net Factored Wind Uplift
Enter applicable net factored wind uplift pressure in kPa. For shear only tables, do not enter a value. For Combined Shear and Uplift, MWFRS level loads may be appropriate as the shear would be MWFRS level of force. For Components and Cladding, the uplift load can be checked independently without entering shear load.
kPa
Deck Type
Select the type of steel deck panel to calculate diaphragm shear strength tables. 38 mm wide rib, narrow rib, intermediate rib and 76 mm deep rib deck profiles are available for roofs. These decks are bare decks with no fill. Composite decks are available for floor decks. Fill options are available for floor decks.
Deck Thickness

Enter the thickness of steel deck.

Gauge Thickness
28 0.0149 in 0.38 mm
26 0.0179 in 0.45 mm
24 0.0239 in 0.60 mm
22 0.0295 in 0.75 mm
20 0.0358 in 0.91 mm
18 0.0474 in 1.20 mm
16 0.0598 in 1.52 mm
There are no Support Fastener options available for the selected Deck Thickness and Support Thickness entered. Please modify the input or contact Simpson Strong-Tie for further assistance.
Design Method

Select the design standard that is appropriate for your building code and loading requirements.

Load Type

Quik Drive Fastener Information

Support Fastener Options
X Screw X Screw
OR
XM Screw XM Screw
OR
XL Screw XL Screw
Support Fastener Pattern


Support Thickness

Enter the thickness of the support steel.

For support thickness less than 3.2mm, high shear screws like XL and XM are not available. For optimum design select a support thickness greater than or equal to 3.2mm.

Minimum support steel strength assumed is fy = 248MPa, fu = 345MPa except 18 gauge steel where fy = 228 MPa and fu = 310 MPa.

First Deck Span in Table
The span of the deck between the support steel (joists, beams). Enter the first deck span to be shown in the table. Tables are generated starting with the span selected and spaced in 150 mm increments. Total of 10 deck spans are calculated in the table.
mm
Side-Lap Fastener
Side-Lap Option
Select whether tables are generated based on side-lap fastener spacing or number of fasteners per span.
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Steel Deck
Diaphragm Calculator
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Table Notes

Nominal shear listed shall be used with the appropriate Φ factor and may also be limited by panel shear buckling (reference table below).

Building Information

Project
Length, L
Enter the length of the zone. The information is used in selecting the optimized solution based on the cost index.
ft
Width, B
Enter the width of the zone. The information is used in selecting the optimized solution based on the cost index.
ft
Joist Spacing, p
The support steel spacing (of joists, beams) should be entered here.
ft

Load Information

The load type can be entered here. Two options are available:

  • Wind
  • Seismic
Diaphragm Shear

Enter the demand shear load acting in the zone. In case of ASD, enter service shear load and if LRFD is chosen enter factored shear load.

plf
Net Uplift

The net uplift load acting in the zone should be entered here. In case of ASD. enter service level load and in case of LRFD enter factored load.

The uplift load entered is used to determine the combined shear and tension interaction effects on the fasteners to determine the remaining diaphragm shear capacity; however, it is not used to design the deck itself.

psf

Steel Deck Information

Deck Type
The type of steel deck can be chosen here. The Steel Roof Deck has typical roof deck profiles and deep decks. The Floor Deck has Composite decks and Non-Composite(form)decks.

Deck Panel

The type of deck panel can be selected here.

For Steel Roof Deck B, F, A and N decks are available:

  • B = WR (Wide Rib)
  • F = IR (Intermediate Rib)
  • A = NR (Narrow Rib)
  • N = DR (Deep Rib)

For floor decks, form deck and composite decks are available to choose from.

Deck Properties
Edit Deck Properties
Fill Type

The type of fill material can be selected here. The available fill options for each type of deck are:

Steel Roof Decks

  • No Fill

Non-Composite Floor Decks

  • No Fill (Bare Deck)
  • Type I Insulating Fill, fc' = 125 psi
  • Type II Insulating Fill, fc' = 125 psi
  • Light Weight Concrete, fc' = 3000 psi
  • Normal Weight Concrete, fc' = 3000 psi

Composite Floor Decks

  • No Fill (Bare Deck)
  • Light Weight Concrete, fc' = 3000 psi
  • Normal Weight Concrete, fc' = 3000 psi
Panel Width

The panel width for the selected deck can be chosen here. Choose a particular width that is available for the deck selected or choose 'any panel width' option to get all options.

1.5 B, F, A Decks

  • 36" panel width
  • 30" panel width
  • Any panel width: Includes all panel widths in design.

3 N Decks

  • 24" panel width

Form Decks

  • 35" panel width
  • 30" panel width
  • Any panel width: Includes all panel widths in design.

Composite Decks

  • 36" panel width
Deck Thickness

Select the thickness of the steel deck here. Select "Optimize" to allow the program to design the minimum thickness of the steel deck for a given diaphragm shear and uplift. The diaphragm shear capacity is determined in accordance with SDI Diaphragm Design Manual DDM03.

Please Note:

Deck thickness does not consider gravity or vertical loads such as but not limited to dead and live loads on the deck, suspended loads such as ceilings, light fixtures, ducts or other utilities, construction and maintenance loads or cantilever loads. Gravity and all other load cases shall be the responsibility of the building designer.

  • 28 Gauge = 0.0149"
  • 26 Gauge = 0.0179"
  • 24 Gauge = 0.0239"
  • 22 Gauge = 0.0295"
  • 20 Gauge = 0.0358"
  • 18 Gauge = 0.0474"
  • 16 Gauge = 0.0598"
Support Steel Thickness

Enter the steel thickness of the support:

  • 18 Gauge = 0.0451"
  • 16 Gauge = 0.0566"
  • 14 Gauge = 0.0713"
  • 12 Gauge = 0.1017"
  • 1/8" = 0.125"
  • 3/16" = 0.1875"
  • 1/4" = 0.2500"
  • 3/8" = 0.3750"

For support thickness less than 0.125” high shear screws like XL and XM are not available. For optimum design select a support thickness greater than or equal to 0.125”

Minimum support steel strength assumed is Fy = 36 ksi, Fu = 50 ksi except 18 gauge steel where Fy = 33 ksi and Fu = 45 ksi.


Fastener Information

Structural Fastener Inputs

Structural Fastener
Corrosion Resistance

Simpson Strong-Tie fasteners are available with bright-blue zinc coating or Quik Guard® coating

  • Bright-blue zinc coating provides a low level of Corrosion Resistance. In the ASTM B117 salt spray test it provides 36 hours of protection before the appearance of red rust.
  • Quik Guard is a proprietary double-barrier coating that consists of an electrodeposited base layer with an organic paint layer. In the ASTM B117 salt spray test Quik Guard has an average 1.9% red rust at 1,000 hours of exposure. This coating provides a medium level of Corrosion resistance.
Structural Screw
Optimized Solutions

This option provides the most optimized solution based on the cost. It will run the options for various Simpson Strong-Tie fasteners and provides the three lowest cost options with the model number of structural fastener/model number of side-lap fastener and the structural pattern and number of side-lap fasteners.

Model Number

Side-Lap Fastener Inputs

Side-Lap Fastener
Corrosion Resistance

Simpson Strong-Tie fasteners are available with bright-blue zinc coating or Quik Guard® coating

  • Bright-blue zinc coating provides a low level of Corrosion Resistance. In the ASTM B117 salt spray test it provides 36 hours of protection before the appearance of red rust.
  • Quik Guard is a proprietary double-barrier coating that consists of an electrodeposited base layer with an organic paint layer. In the ASTM B117 salt spray test Quik Guard has an average 1.9% red rust at 1,000 hours of exposure. This coating provides a medium level of Corrosion resistance.
Side-Lap Screw
Number of Side-Lap Fasteners
Edit Range
Model Number
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