SECTION 13121

PRE-ENGINEERED BUILDINGS

PART 1 GENERAL

SECTION INCLUDES

Pre-engineered and shop fabricated structural steel building frame.

Exterior overhead doors.

REFERENCES

AISC - Specification for the Design, Fabrication and Erection of Structural Steel for Buildings.

ASTM A36 - Structural Steel.

ASTM A153 - Zinc Coating (Hot Dip) on Iron and Steel Hardware.

ASTM A307 - Carbon Steel Externally Threaded Standard Fasteners.

ASTM A325 - High Strength Bolts for Structural Steel Joints.

ASTM A386 - Zinc-coating (Hot-Dip) on Assembled Steel Products.

ASTM A446 - Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Structural (Physical) Quality.

ASTM A490 - Quenched and Tempered Alloy Steel Bolts for Structural Steel Joints.

ASTM A500 - Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes.

ASTM A501 - Hot Formed Welded and Seamless Carbon Steel Structural Tubing.

ASTM A525 - Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, General Requirements.

ASTM A529 - Structural Steel with 42,000 psi (290 MPa) Minimum Yield Point.

ASTM A572 - High Strength Low Alloy Columbium-Vanadium Steel of Structural Quality.

AWS A2.0 - Standard Welding Symbols.

AWS D1.1 - Structural Welding Code.

P.	SSPC - Steel Structures Painting Council.

DESIGN REQUIREMENTS

ORIGINAL BUILDING MANUFACTURER:

MITCHELL ENGINEERING, COLUMBUS, MISSISSIPPI.

Provide design, manufacture and installation of new framing members, wind braces, siding modifications and , if necessary, concrete slab modifications, to provide 3 complete and operating 12 foot wide by 10 foot high overhead doors in the north wall of Building No. 933. Wind bracing shown on drawings shall be verified or changed in design.

B.	Exterior wall and roof system to withstand imposed loads with maximum allowable deflection of span: To match original building design.

Assembly to permit movement of components without buckling, failure of joint seals, undue stress on fasteners or other detrimental effects, when subject to temperature range of 90 degrees F.

SUBMITTALS

Submit under provisions of Section 01300.

Shop Drawings: Indicate assembly dimensions, locations of structural members, connections, and attachments.

Manufacturer's Installation Instructions: Indicate preparation requirements, and assembly sequence.

PROJECT RECORD DOCUMENTS

Submit under provisions of Section 01700.

QUALITY ASSURANCE

Fabricate structural steel members in accordance with AISC - Specification for the Design, Fabrication and Erection of Structural Steel for Buildings.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum three years documented experience.

Design structural components under direct supervision of a Professional Structural Engineer experienced in design of this work and licensed in the State of Louisiana.

Design Work under direct supervision of a Professional Structural Engineer experienced in design of this work and licensed in the State of Louisiana.

FIELD MEASUREMENTS

Verify that field measurements are as indicated on shop drawings.

WARRANTY

Provide five year warranty under provisions of Section 01700.

Warranty: Include coverage for any new exterior pre-finished surfaces to cover pre-finished color coat against chipping, cracking or crazing, blistering, peeling, chalking, or fading.

Warranty: Include coverage for weather tightness of any new building enclosure elements after installation.

PART 2 PRODUCTS

MANUFACTURERS - BUILDING SYSTEM

Mitchell Engineering, Columbus, Mississippi.

Other acceptable manufacturers offering equivalent systems:

No restrictions.

MATERIALS - FRAMING

Structural Steel Members: ASTM A36. Grade 50.

Plate or Bar Stock: ASTM A529.

Anchor Bolts: ASTM A307.

Bolts, Nuts, and Washers: ASTM A325.

Welding Materials: AWS D1.1; type required for materials being welded.

Grout: Non-shrink type, premixed compound consisting of non-metallic aggregate, cement, water reducing and plasticizing agents, capable of developing minimum compressive strength of 2400 psi in two days and 7000 psi in 28 days.

MATERIALS - WALL AND ROOF SYSTEM

Sheet Steel Stock: ASTM A446 Grade A, galvanized to ASTM A525 G90 designation.

Joint Seal Gaskets: Manufacturer's standard type.

Fasteners: Manufacturer's standard type, galvanized to ASTM A386 1.25 oz/sq ft, finish to match adjacent surfaces when exterior exposed.

Sealant:	Manufacturer's standard type, as specified in Section 07900, non-staining, elastomeric, skinning.

OVERHEAD DOORS

To match existing overhead door.

PART 3 EXECUTION

ERECTION - FRAMING

Erect framing in accordance with AISC Specification.

Provide for erection and wind loads.	Provide temporary bracing to maintain structure plumb and in alignment until completion of erection and installation of permanent bracing, as required by design.

Set column base plates with non-shrink grout to full plate bearing.

Do not field cut or alter structural members without approval of Architect/Engineer.

After erection, prime welds, abrasions, and surfaces not shop primed.

ERECTION - WALL AND ROOFING SYSTEMS

Install in accordance with manufacturer's instructions.

Exercise care when cutting prefinished material to ensure cuttings do not remain on finish surface.

Fasten cladding system to structural supports, aligned level and plumb.

Install sealant and gaskets to prevent weather penetration.

System: Free of rattles, noise due to thermal movement and wind whistles.

END OF SECTION