This chapter shall govern the quality, design, fabrication and erection of aluminum. The quality, design, fabrication and erection of aluminum used structurally in buildings or structures shall conform to good engineering practice, the provisions of this chapter and other applicable requirements of this code.
PRIMARY MEMBER. Structural framing members providing structural support to other members and/or surfaces of a structure including, but not limited to beams, posts, columns, joists, structural gutters, headers, eave rail, purlins, roof brace.
SECONDARY MEMBERS. Structural framing members which do not provide basic support for the entire structure, generally including, but not limited to, such members as kickplate rails, chair rails, roof or wall panels, wall brace.
STRUCTURAL MEMBERS. Members or sections that provide support to an assembly and/or resist applied loads.
Structural members supporting screened enclosures shall be designed for wind in both of two orthogonal directions using the pressures given in Table 2002.4. Each primary member shall also be designed for a 300 pound (1.33 kN) load applied vertically downward along any 1 foot (305 mm) of any member, not occurring simultaneously with wind load.
|ULTIMATE DESIGN WIND SPEED VULT (MPH)|
|Surface||Design Pressures by Exposure Category (psf)|
|Horizontal Pressures on Windward Surfacesd||17||24||28||20||28||33||23||32||38||27||38||44||31||43||51||36||49||58||40||56||66|
|Horizontal Pressures on Leeward Surfacesd||13||18||21||15||22||26||20||26||31||21||29||34||22||34||40||25||39||46||29||44||52|
|Vertical Pressures on Screen Surfacesc||4||7||8||6||8||9||6||9||11||8||11||12||9||12||14||10||14||16||11||15||18|
|Vertical Pressures on Solid Surfacese||14||19||23||17||23||27||20||27||32||23||32||37||25||36||42||29||41||48||33||46||54|
- Pressures apply to enclosures with a mean enclosure roof height of 30 feet (10 m). For other heights, multiply the pressures in this table by the factors in Table 2002.4A.
- Apply horizontal pressures to the area of the enclosure projected on a vertical plane normal to the assumed wind direction, simultaneously inward on the windward side and outward on the leeward side.
- Apply vertical pressures upward or downward to the area of the enclosure projected on a horizontal plane.
- Apply horizontal pressures simultaneously with vertical pressures.
- Table pressures are MWFRS Loads. The design of solid roof panels and their attachments shall be based on component and cladding loads for enclosed or partially enclosed structures as appropriate.
- Table pressures apply to 20 × 20 × 0.013" mesh screen. For 18 ×14 × 0.013" mesh screen, pressures on screen surfaces may be multiplied by 0.88. For screen densities greater than 20 × 20 × 0.013", use pressures for enclosed buildings.
- Table pressures may be interpolated using ASCE 7 methodology.
- For allowable stress design (ASD) pressures shall be permitted to be multiplied by 0.6.
HEIGHT ADJUSTMENT FACTORS
The following design guides shall be accepted as conforming to accepted engineering practices:
For the purpose of applying the criteria of the AAMA/NPEA/NSA 2100, sunrooms shall be categorized in one of the following categories by the permit applicant, design professional or the property owner where the sunroom is being constructed.
(1) The purpose of this section is to provide an alternate method for designing aluminum screen enclosures as defined by the Florida Building Code, permitting the loads of the structural frame to be based on portions of the screen in the screen walls removed, retracted, moved to the open position, or cut. The use of framing materials other than aluminum is allowed in accordance with Section 104.11 The method applies only to walls and roofs with 100-percent screen.
(a) Screen enclosure frames designed in accordance with the screen removal alternates of this section, shall be designed using signed and sealed site-specific engineering and shall be designed in accordance with the wind load provisions of Section 1609.1.1.
(d) The design shall be by rational analysis or by 3D finite element analysis. Either method will be acceptable.
(2) Where screen enclosures are designed in accordance with the screen removal alternates of this section, removable screen may consist of removable panels, retractable panels, or by designating specific screen panels in the design in which the screen is to be removed by cutting the screen. Removable panels shall be removed, retractable panels shall be placed in the retracted position without increasing the load on the affected area. Screen designated in the design to be cut shall be completely cut when wind speeds are forecast to exceed 75 mph (33.5 m/s).
(3) Where screen enclosures designed in accordance with the screen removal alternates of this section serve as the barrier required by Section 454.2.17 the required minimum height of the barrier shall be maintained when screen panels are retracted, removed, moved to the open position or cut.
(4) Where screen enclosures are designed in accordance with the screen removal alternates of this section, retractable screen panels, removable screen panels, and screen panels identified to be cut shall be clearly identified on adjacent structural members with highly visible permanent labels, at each panel, or by other means approved by the local building department.
(5) Where screen enclosures are designed in accordance with the screen removal alternates of this section, the retraction of screen panels, removal of screen panels, or cutting of screen panels shall not require the use of ladders or scaffolding.
(7) Where screen enclosures are designed in accordance with the screen removal alternates of this section, based on removing screen panels by cutting the screen, the contractor shall provide replacement screen for a one-time replacement of all screen and spline designated by the design to be cut.
(8) Where screen enclosures are designed in accordance with the screen removal alternates of this section, the contractor shall provide written notice to the owner and the local building code enforcement department that the owner must retract, remove, or cut a panel or panels of the screen enclosure in accordance with the project engineering design or the manufacturer's instructions when wind speeds are expected to exceed 75 mph (33.5 m/s).