ANSI/SDI-C1.0 Standard for Composite Steel Floor Deck 5

Installation/Anchorage:

A. Floor deck units shall be anchored to steel supporting members including perimeter support steel and/or bearing walls by arc spot puddle welds of the following diameter and spacing, fillet welds of equal strength, or mechanical

fasteners.

1. All welding of deck shall be in strict accordance with ANSI/AWS D1.3, Structural Welding Code Sheet Steel. Each welder shall demonstrate an ability to produce satisfactory welds using a procedure such as shown in the SDI Manual of Construction with Steel Deck, or as described in ANSI/AWS D1.3.

2. A minimum visible 5/8 inch (15 mm) diameter arc puddle weld shall be used. Weld metal shall penetrate all layers of deck material, and shall have good fusion to the supporting members.

3. Edge ribs of panels shall be welded at each support. Space additional welds an average of 12 inches (300 mm) apart but not more than 18 inches (460 mm).

4. When used, fillet welds shall be at least 1-1/2 inches (38 mm) long.

5. Mechanical fasteners, either powder actuated, pneumatically driven, or

screws, shall be permitted in lieu of welding to fasten deck to supporting framing if fasteners meet all project service requirements. When the fasteners are powder actuated or pneumatically driven, the load value per

fastener used to determine the maximum fastener spacing is based on a minimum structural support thickness of not less than 1/8 inch (3 mm) and on the fastener providing a minimum 5/16 inch (8 mm) diameter bearing surface (fastener head size). When the structural support thickness is less than 1/8 inch (3 mm), powder actuated or pneumatically driven fasteners

shall not be used, but screws are acceptable. Commentary: Mechanical

fasteners (screws, powder or pneumatically driven fasteners, etc.) are recognized as viable anchoring methods, provided the type and spacing of the fastener satisfies the design criteria. Documentation in the form of test data, design calculations, or design charts should be submitted by the

fastener manufacturer as the basis for obtaining approval.

6. For deck units with spans greater than 5 feet (1.5 m), side laps and perimeter edges of units between span supports shall be fastened at intervals not exceeding 36 inches (1 m) on center, using one of the

following methods:

a. #10 self drilling screws

b. Crimp or button punch

c. Arc puddle welds 5/8 inch (15 mm) minimum visible diameter, or minimum 1 inch (25 mm) long fillet weld.

Commentary: The above side lap spacing is a minimum. Service loads or diaphragm design may require closer spacing or larger side lap welds. Good metal to metal contact is necessary for a good side lap weld. Burn holes are to be expected.

B. Accessory Attachment:

1. Pour Stop and Girder Fillers:

Pour stops and girder fillers shall be fastened to supporting structure in accordance with the SDI Standard Practice Details, and Attachment C2.

2. Floor Deck Closures:

Column closures, cell closures, girder closures and Z closures shall be fastened to provide tight fitting closures at open ends of ribs and sides of

decking. Fasten cell closures at changes of direction of floor deck units unless otherwise directed.