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Section 2223 High-Velocity Hurricane Zones—Preengineered, Prefabricated Metal Building Systems and Components (Preengineered Structures)

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2223.1 Scope
Metal buildings (preengineered structures) shall include, but not be limited to, tapered or straight web structural steel frames and predominantly cold-formed steel secondary components, including, but not limited to, girts, purlins, roof sheets, wall sheets, etc.
2223.2 Standards
Frames and components shall comply with the standards set forth in Section 2214.3.
2223.3
Structural construction documents for preengineered structures shall indicate the necessary measures for adapting the structures to the specific site. The structural construction documents shall indicate all openings, concentrated loads and other special requirements. Foundation conditions assumed in the design shall be indicated as well as the location and magnitude of building reactions on that foundation under all design conditions.
2223.4 Structural Submittals
2223.5 Design
A building or component system in this section shall have a structural engineer of record and/or architect of record responsible for the overall design and performance of the entire building including the foundation and the anchorage of the preengineered metal systems buildings thereto. The structural engineer of record and/or the architect of record shall provide the structural construction documents necessary for permitting.
2223.5.1
Calculations for drift and deflection of the metal system building shall be by the specialty engineer.
2223.5.2
Calculations for deflection shall be done using only the bare frame method. Reductions based on engineering judgment using the assumed composite stiffness of the building envelope shall not be allowed. Drift shall follow AISC serviceability design considerations for low-rise buildings. The use of composite stiffness for deflection calculations shall be permitted only when actual calculations for the stiffness are included with the design for the specific project. When maximum deflections are specified by the structural construction documents, calculations shall be included in the design data.
2223.5.3
The manufacturer shall design the metal system building and/or component system in accordance with the provisions of Chapter 16 (High-Velocity Hurricane Zones), and the design shall be signed, dated and sealed by the specialty engineer and reviewed by the structural engineer of record and/or the architect of record. The manufacturer of the metal system building and or component system shall be responsible to provide all reactions to the structural engineer of record and/or the architect of record.
2223.5.4
Fastenings shall be by bolting, welding or other approved fastening device that provides a resistance to lateral movement as required by rational analysis or by test, but not less than 400 pounds per lineal foot (5838 N/m).
2223.6 Permitting
2223.7 Fabrication and Erection
2223.7.1
2223.7.2
Temporary bracing shall be provided during erection and shall remain in place until all structural frames, purlins, girts, flange braces, cable or rod bracing and sheets used as diaphragms have been installed.
2223.8 Roof Sheets, Wall Sheets, Roof Panels and Wall Panels
2223.8.1
2223.8.2
The fusion welding of structural members and structural sheets defined in Section 2222.4 and less than 22 gauge (0.0299 inch nominal) in thickness shall have minimum of 5/8 inch (17 mm) diameter welds through weld washers not less than 14-gauge in thickness and 1 inch (25 mm) in diameter, contoured if necessary to provide continuous contact, or an equivalent device.
2223.8.3
Clip-mounted standing-seam roof sheets shall not be used as diaphragms nor shall they be considered as adequate lateral bracing of the flange of the secondary member to which they are attached unless one or both of these features are designed into the sheathing system and the manufacturer can certify by testing and/or analysis that such capabilities exist and are appropriately defined.
2223.8.4
Structural standing-seam roof sheets shall be a minimum of 24 gauge [0.0239 inch (0.6 mm) nominal] in thickness.
2223.8.5
Direct screw attached roof and wall sheets may be used as diaphragms provided the sheets are a minimum of 24 gauge [0.0239 inch (0.6 mm) nominal] in thickness. Additionally, these sheets shall be considered to laterally brace the flange of the secondary member to which they are attached.
2223.8.6
See Section 2222 for additional requirements for roof sheets, wall sheets, roof panels and wall panels.
2223.9 Roof Purlins and Wall Girts
2223.9.1
Adequate bracing shall be provided to the compression flanges of secondary members with special attention to those members subject to uplift or outward pressures where no roof or wall sheets are attached to provide such bracing. Sag rods shall not be considered bracing when located in the neutral axis of the web of the secondary members.
2223.9.2
Roof purlins and wall girts shall be laterally braced in addition to relying on deck and panel diaphragm action.
2223.9.3
The ends and bearing points of secondary members shall be designed to carry 100 percent of dead, live and collateral loads superimposed on them by wind.
2223.9.4
Upward or outward forces of wind are to be calculated without live and collateral loads. When downward or inward forces caused by wind are involved, the dead forces plus collateral load forces must be combined but the roof live load may be omitted.
2223.10 Individual Structural Members
2223.10.1
Cables and rods shall not be used as lateral bracing in habitable structures. Lateral bracing, when used, shall have a slenderness ratio of 300 or less, unless restricted by any other section of this code.
2223.10.2
2223.10.3
All doors shall be anchored as part of the frame in the closed position.
2223.10.4
See Section 2222 for additional requirements for metal building systems and components.
2223.11 Inspection
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