Metal Building Components New Orleans Louisiana
General Specifications
SPECIFICATION DATA:
Structural Design · Structural Framing
General
The work covered in this section shall include all labor, material, equipment, and services necessary for the design and fabrication of an AMC Building in accordance with these specifications and as shown on the contract drawings. The AMC Building shall include all primary and secondary structural framing members, covering, fasteners, and trim for the AMC Building only and those accessories such as roof ventilators, overhead doors, insulation, light transmitting panels, windows, personnel doors, and other miscellaneous items as shown or called for in the purchase order contract.
An anchor bolt setting drawing shall be furnished by AMC and will be used for determining the exact perimeter dimensions for forming the foundation and setting of anchor bolts by others. Dimensions shown on the contract drawings are nominal and shall not be used for concrete forming.
Complete erection drawings shall be furnished in duplicate by AMC for approval, when requested. These drawings shall include the building size, design loads, type of construction, material and gauge of covering, and type, quantity and location of accessory items. Fabrication drawings are not furnished for approval.
AMC shall furnish complete erection drawings showing sidewall, endwall, and roof framing, transverse cross-sections, covering and flashing details, and accessory installation details to clearly indicate the proper assembly of all building parts.
AMC utilizes those standards, specifications, and/or interpretations and recommendations of professionally recognized agencies and groups, such as AISC, AWS, ASTM, AISI, MBMA, Federal, etc. as the basis in establishing its own design, fabrication, and quality criteria, standards, practices, methods, and tolerances. For convenience one or more provisions of a particular group or agency, i.e., AISC, AWS, etc. specifications and/or major recommendations may be referenced in AMC’s documents where appropriate. In all events, however, unless stipulated otherwise in the contract documents, AMC’s design, fabrication, and quality criteria, standards, practices, methods and tolerances will govern the work – any other interpretations to the contrary notwithstanding.
Structural Design
General: All structural steel sections and welded plate members shall be
designed in accordance with AISC, “Specifications for the Design,
Fabrication, and Erection of Structural Steel Buildings.”
All cold-formed steel members shall be designed in accordance with AISI, “Specifications for Design of Cold-Formed Structural Steel Members.”
Design Loads: Both the roof live loads and the wind loads shall be as specified or as determined in accordance with the Design Practices of the “Metal Building Systems Manual” by the Building Manufacturers Association.
In the design of the primary framing members, the roof live load and the wind loads shall be applied in accordance with MBMA “Metal Building Systems Manual” as interpreted by AMC.
Roof live loads shall be applied to the horizontal projection of roof framing members.
The design wind pressure shall be applied to the structural members, covering, fasteners and systems providing stability for the building.
The magnitude and location of any auxiliary or collateral design loads such as cranes, material handling systems, sprinklers, mechanical and electrical systems, and ceiling loads must be clearly set forth in the contract specifications.
Design
Certifications: Upon request, AMC shall furnish erection drawings or a letter of design certifications with the seal of a registered professional engineer.
Structural Steel Fabrication
General: All primary and secondary structural members shall be factory cut, formed, punched, welded, cleaned, and painted for assembly. All base plates, cap plates, stiffener plates, and splice plates shall be shop fabricated complete with bolt connection holes.
All shop connections shall be welded in accordance to the American Welding Society standard, D1.1, D1.3, and other specified procedures. Flange to web welds shall be continuous using and automatic arc process. All welds shall meet of exceed design requirements.
The yield stress of all steel for structural framing members shall meet or exceed the yield stress used in the Design Calculation.
All field connections shall be bolted. High strength bolts shall be installed by the turn of the nut method. Bolts shall be:
Primary Connections – – – – – – – High Strength ASTM A-325
Secondary Connections – – – – – Machine Bolts ASTM A-307
Cold-formed sections shall be manufactured by precision roll or press forming. All dimensions shall be within MBMA accepted tolerances and formed member shall have no excessive fluting, buckling, or waviness.
All structural framing members shall be cleaned to remove all dirt, grease, oil, loose mill scale, rust, flux, and other foreign matter and given one shop coat of industrial, quick-dry, lead-free, red oxide alkyd enamel primer.
Primary
Structural
Framing: Primary structural framing shall include the transverse rigid frame, lean-to rafter beams and columns, canopy beams, intermediate columns, built-up frames, endwall columns, and wind bracing.
Steel used the fabrication of built-up primary structural members shall have a minimum yield of 50,000 psi. Hot-rolled primary structural members shall have a minimum yield of 50,000 psi. Steel with a minimum yield from above may be used as required by design or as specified.
Primary framing shall be shop fabricated and shall include factory-welded purlin and girt clips. Holes shall be provided by the factory for attachment of secondary members and bracing.
Bearing endwall frames shall consist of endwall columns, corner columns and roof beams as required by design criteria.
Interior frames shall be substituted for bearing endwall frames when specified.
Secondary
Structural
Members: Secondary structural framing shall include purlins, girts, eve struts, flange bracing, base support, clips and other miscellaneous structural parts.
Steel used in the fabrication of cold-formed structural members shall have a minimum yield of 57,000 psi. Steel with a minimum yield different from above, may be used as required by design or as specified.
Purlins and girts – Purlins and girts shall bolt to clips, which are factory-welded to the frames. Purlins and girts shall be roll-formed or press-formed with stiffening lips on the flanges. Stiffening lips on zee sections shall be formed at tan angle of 50 degrees with the flanges to facilitate nesting.
Eave Struts – Eave Struts shall be “C” sections with one flange cold-formed to suit the roof slope and vertical wall condition and provide suitable fastening surfaces for both wall and roof sheets. Steel in eave struts shall be 14 gauge, with a minimum yield of 57,000 psi.
Wind Bracing – Buildings shall be designed to resist wind loads by diagonal bracing consisting of either cables, rods or angles; diaphragm action of the wall panels and girts, structural bents or a combination of these methods.
Flange Bracing – The inside flange of all frames shall be adequately braced so that the allowable compressive stress is adequate for the design load combination.
Base Member – A continuous base member shall be provided to which the base of the wall covering may be attached.
Framed Openings – Structural framing members for all openings shall be adequate for the specified design loads.
Roof, Walls, and
Interior Panels
General: Typical roof, wall and interior liner panels shall be either 29 gauge, 25 gauge or 24 gauge, galvanized or Galvalume coated steel (painted or unpainted) and roll-formed into various panel configurations.
Base Metal: Galvanized steel panels shall be coated with 0.9 oz of zinc per sq. ft. total both sides (G-90 designation) in accordance with ASTM A 553-94. Galvalume steel panels shall be coated with 0.55 oz. Of aluminum-zinc alloy per sq. ft. total both sides in accordance with ASTM A 792-94. All standard roof and wall panels are manufactured from 80,000-psi minimum yield steel.
Panel Description: The “R” panel shall be precision roll formed for 3ft. wide coverage and shall have 4 major ribs tapering in width from 3 5/64” to 1” and spaced on 12” centers 1 ¼” deep. Two minor ribs shall be centered between the major ribs. The “R” panel is usable on roof, wall, and as interior liner panels.
The “PBR” panel has the same configuration as the “R” panel with the addition of a purlin bearing lip. The “PBR” panel is primarily used as a roof panel.
The “R” panel and “PBR” panels are classified by Underwriters Laboratories, Inc for class 30 and 90 wind uplift resistance under construction numbers 30, 79, 161, and 167 as referenced in the UL Building Materials Directory.
Fasteners: Panel fasteners shall be No. 12 x 1 ¼” zinc plated self-drillers with steel-backed flat bonded neoprene or EFDM washers. Fasteners are available in color matched finishes.
Optional long life, zinc aluminum die cast head, corrosion resistant, self-drilling fasteners are available.
Installation of
Roof and Wall
Panels: Roof panels shall be continuous from ridge to eave for buildings 60ft. wide or less. Where endings are required they shall be a minimum of 6” and shall occur at a roof purlin.
Sidewall panels shall be continuous from eave to 1 ½” below the column base plate.
Endwall panels shall be continuous from the roofline to 1 ½” below the column base plate.
Trim Flashing,
Gutter and
Downspouts: Trim and/or flashing shall be provided at the rake, corners and eaves; at framed openings, and whenever necessary to provide weather tightness and finished appearance.
Galvanized steel for trim, flashing, gutters, downspouts, and other miscellaneous uses shall be 26 gauge and shall conform to ASTM A 653 commercial quality or ASTM A 653 structural quality grade 50 Class 1. Galvalume™ coated steel shall be ASTM a 792 AIM 50 OR Grade 50.
Gutters shall be formed to match the profile of the rake trim and equipped with adjustable supports on 36” centers. Downspouts shall be equipped with wall attachments and 45-degree elbows at the floor line.
Accessories
Personnel Doors: Door leaves shall be 1 ¾” thick full flush, fabricated from 20 gauge galvanized steel and bonderized for paint adherence. The core material shall be a one-piece polystyrene core bonded to the face sheers with a (2) component epoxy adhesive. Doors shall have a “U” factor of 0.16 and sound transmission of 0.32.
Door frames shall be 16 gauge galvanized steel with reinforced recessed hinge plates.
Doors shall be furnished with cylindrical lock sets and prepared for 4 ½” x 4 ½” regular weight hinges.
Door leaves and frames shall be prime painted with one coat of white paint, oven-dried to produce a hard, long lasting surface.
The threshold shall be an extruded aluminum shape to provide positive weather seal.
Aluminum
Windows: Aluminum windows shall be specially designed for installation with the exterior wall panels. Windows shall be complete with latch, removable half screens, weather stripping, and provisions for installation of storm sash. Windows shall be factory glazed using vinyl glazing beads and shall be back-bedded. All structural members shall be extruded aluminum.
Ventilators: Ventilators shall be gravity type, fabricated from galvanized of Galvalume™ coated steel, and shall be continuous furnished in 10’0” lengths with end caps and splice components shall be provided for continuous installation. Continuous ventilators shall or shall not have dampers. Dampers shall provide an adjustable opening at the throat and shall be of the manually operated type.
Round ventilators are designed with interior baffles and exterior wind bank to provide maximum airflow. Round ventilators shall or shall not have dampers.
All ventilators shall be furnished with bird screen. Ventilators for colored roofs shall be white.
Light
Transmitting
Panels: High strength fiberglass reinforced panel which incorporates a heavy mesh of woven fiberglass cloth (2oz. per sq. ft. nom.) in addition to a random strand mat of cut glass fibers.
LTP panels shall have a profile matching the roof or wall panels and shall be 1/18” thick, with a nominal weight of 6 oz. per sq. ft. Translucent panels are white in color and have a nominal light transmittance of 55% -or – 5% per ASTM D1494.
Louvers: Louvers shall be furnished with 18 gauge galvanized welded frames with 20 gauge galvanized blades. The blades shall be of the overlapping type to provide maximum weather tightness while allowing free airflow. Louvers shall be:
a: Fixed type (blades in fixed positions)
b: Adjustable, hand crank operated
(pull chain operator option)
All louvers are self-flashing and self-framing. Louvers for colored buildings shall be white.
Overhead Doors: Framed members as described in secondary framing section shall be furnished for all overhead doors, complete with support headers.
Insulation: Insulation, when required, shall be blanket type fiberglass with a vapor barrier or other specified type ade1uate to satisfy building occupancy requirements. Thickness and density shall be determined by required “U” factor.
Building Anchorage and Foundation
Anchorage: The building anchor bolts and related anchorage shall be designated to resist the column reactions resulting from the specified loads as applied in the specified loading combination. Minimum size anchor bolts shall be as specified by the building manufacturer.
Foundation: The building foundation shall be designed by a qualified engineer to support the building reactions in addition to other loads imposed by the building use or occupancy.
With new innovations continually occurring in the metal building industry, AMC is constantly researching improvements in its product; therefore, information shown in this booklet is subject to change without notice.
BUILDING TYPES
SCF
This building type is a single span rigid frame structure with straight columns and
either a straight or tapered rafter.
SCFM
This building type is a continuous span rigid frame structure with straight column
and either straight or tapered rafters and one or more interior support columns.
TCF
This building type is a single span rigid frame structure with a tapered column and
rafter.
TCFM
This building type is a continuous span rigid frame structure with tapered column
and rafters and one or more interior support columns.
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SCF SCFM TCF TCFM
SSF
This building type is a single span, single slope frame with a straight column and
rafter.
SSFM
This building type is a continuous span, single slope frame with a straight column
and either a straight or tapered rafter and one or more interior support columns.
SST
This building is a single span, single slope frame with a tapered column and rafter.
SSTM
This building type is a continuous span, single slope frame with a tapered column
and rafter with one or more interior support columns.
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SSF SSFM SST SSTM
ENDWALL SYSTEMS
Type IR and IA Endwalls
CONTENTS
Corner columns, end rafters, end posts, girts (flushed framed), wall brace cables (if
required by design), panels and trim.
All frames are designed to support half of the roof end bay with vertical load
and half of the sidewall end bay with full wind load.
Endwall type must be specified sales order and designated on building sketch
form.
Type IR Type IA
Type IIR and IIA Endwalls
CONTENTS
All frames are designed to support half of the roof end bay with vertical load and
half of the sidewall end bay with full wind load.
End posts are designed to be laterally supported, therefore the TYPE II and III
endwall post must be adequately anchored to masonary or laterally supported by
other means. Laterally unsupported end post are available upon request.
Endwall type must be specified sales order and designated on building sketch
form.
Type IIR Type IIA
ENDWALL SYSTEMS
Type IIIR and IIIA Endwalls
CONTENTS
Corner columns, end rafters, end posts, girts (flushed framed), wall brace cables (if
required by design), rake and corner trim.
All frames are designed to support half of the roof end bay with vertical load and
half of the sidewall end bay with full wind load.
End posts are designed to be laterally supported, therefore the TYPE II and III
endwall post must be adequately anchored to masonry or laterally supported by
other means. Laterally unsupported end post are available upon request.
Endwall type must be specified sales order and designated on building sketch
form.
Type IIIR Type IIIA
Type IVR and IVA Endwalls
CONTENTS
Rigid frame column and rafter, end posts, post connectors, girts, panels, and trim.
All frames are designed to support entire roof end bay under vertical loading and
entire sidewall end bay with full wind loading.
The rafters and columns are identical to the intermediate rafters and columns
except for end post connections.
Endwall type must be specified sales order and designated on building sketch
form.
Type IVR Type IVA
ENDWALL SYSTEMS
Type V Endwall
Rigid frame column and rafter, gable hangers, gable girts, gable panels and trim
All frames are designed to support entire roof end bay under vertical loading and
entire sidewall end bay with full wind loading.
Endwall type must be specified on sales order and designated on building sketch
form.
Type V
Type VI
Rigid frame column and rafter, rake and corner trim
All frames are designed to support entire roof end bay under vertical loading and
entire sidewall end bay with full wind loading.
Endwall type must be specified on sales order and designated on building sketch
form.
Type VI
Type VII
Steel framing, covering and trim are omitted. Type VII endwall is available only
where masonry wall or existing structure provides satisfactory support for roof and
wall members.