MPS Master
SECTION 05 12 00
STRUCTURAL STEEL FRAMING
PART - GENERAL
SUMMARY
Section Includes:
Provide structural steel members referred to or noted by size on Structural Drawings, including but not limited to the following:
Columns
Beams
Lintels
Steel Angle Framing Around Roof Penetrations in Steel Deck
Steel Joist Anchor Plates Where Joists Are Anchored to Masonry Wall Construction
Steel Deck Support Angles Where Steel Deck Anchors to Wall Construction
Structural Steel Trusses
Miscellaneous
Provide bolting and welding required for shop assembly and Project site erection of structural steel.
Products Furnished But Not Installed Under This Section:
Section 03 30 00: Cast In Place Concrete.
Section 04 20 00: Unit Masonry.
SUBMITTALS
General Requirements: Provide submittals in accordance with Section 01 33 00.
Manufacturer’s Literature: Description of shop primer.
Manufacturer’s Data: Certified mill reports.
Shop Drawings:
Include complete details and schedules for fabrication and assembly of members.
Include details of cuts, shop and field connections, splices, camber, holes, and other pertinent data.
Include embedment drawings.
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MPS Master
SECTION 05 12 00
Indicate welds by standard AWS symbols, distinguishing between shop and field welds, and show size, length, and type of each weld.
Indicate type, size, and length of bolts, distinguishing between shop and field installed bolts. Identify pretensioned and slipcritical highstrength bolted connections.
Provide setting drawings, templates, and directions for installation of anchor bolts and other anchorages.
Identify details of Shop Drawings by reference to related detail and sheet numbers of Contract Drawings.
Shop Drawings shall have been thoroughly checked by fabricator before being submitted for review. Review is precautionary measure only and shall not relieve fabricator of full responsibility of correctness of materials, sizes, dimensions, and details.
If structural sections and other details indicated on Drawings cannot be readily obtained, substitution of sections and other details of equal strength which conform to requirements of design may be made only if approved.
Fabrication shall not proceed until Shop Drawings have been reviewed. Fabrication, assembly, and erection shall conform to reviewed Shop Drawings.
Shop Drawings shall be signed by a registered Structural Engineer, registered in the state where Project is located.
QUALITY ASSURANCE
Qualifications of Steel Fabricator:
Fabricator shall have at least 5years of successful experience in fabrication of structural steel similar in size and difficulty of Project.
Fabricator shall submit certifications to Architect/Engineer and Structural Engineer for written approval, that they are registered and approved by building official, in accordance with IBC Chapter17, and shall participate regularly in third party quality control program of AISC.
As an alternate to previously specified requirements, Contractor shall pay for fulltime inspection during fabrication of Project steel. Inspection shall be conducted by Owner’s inspection company at fabrication locale.
Qualifications of Steel Erector:
Erector shall have at least 5years of experience in performing Work of this Section and erecting structural steel.
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Structural Steel Framing
MPS Master
SECTION 05 12 00
Fabricator and erector shall submit resumes showing compliance with Work experience to Architect/Engineer for approval prior to starting Work.
Qualifications of Welders:
Contractor shall provide certification that welders to be employed in this Work have satisfactorily passed AWS qualification tests.
Fabricators and erectors shall submit current welding certifications to Architect/Engineer for written approval prior to start of welding.
Regulatory Requirements:
Fabricate and erect structural steel in compliance with applicable provisions of AISC and RCSC specifications and documents listed under AReference@ article in Part1 of this Section and referenced throughout this Section.
DELIVERY, STORAGE, AND HANDLING
Packing and Shipping of Products:
Fabricate for delivery sequence which will expedite erection and field handling.
Properly mark products to identify location of each component.
Markings shall correspond to markings indicated on Shop Drawings.
Deliver products to Project site and unload.
Handling: Handle products during loading, unloading, and erection using methods and equipment that will prevent damage and distortion.
Storage:
Store products to permit easy access for inspection and identification.
Store steel products above ground on platforms, skids, or other approved supports.
Store fasteners in a protected place. Clean and lubricate bolts and nuts that become dry or rusty before use.
Do not store products on structure in a manner that might cause distortion, damage, or overload to stored products or supporting structure members.
Protection: Protect products from erosion and deterioration.
Repair or Replacement:
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Structural Steel Framing
MPS Master
SECTION 05 12 00
If structural steel products or supporting structure members are damaged, promptly make repairs necessary, to Structural Engineer’s approval, at no additional cost to Owner.
Remove from Project site damaged products and supporting structure members that cannot be satisfactorily repaired and provide new.
SITE CONDITIONS
Welding: Do not perform welding below 0degreesF. Preheat material to be welded and maintain interpass temperatures as required.
SEQUENCING AND SCHEDULING
Coordination:
Deliver anchorage items to be embedded in or attached to concrete and masonry construction by others, as coordinated with related trades, to avoid delay of Work.
Provide setting diagrams, sheet metal templates, instructions, and directions as needed for installation.
PART - PRODUCTS
STRUCTURAL STEEL MATERIALS
Structural Steel Shapes:
W-Shapes: ASTM A992/A992M.
Plates, Angles, Bars, S-Shapes, and Channels: ASTM A36.
Structural Steel Tubing - ColdFormed: ASTM A500, Grade B.
Steel Pipe: ASTM A53, Type E or S, Grade B.
Weight Class: As noted on Drawings.
Finish: Black.
BOLTS, CONNECTORS, AND ANCHORS
High-Strength Bolts, Nuts, and Washers: ASTM A325, Type 1, heavy hex steel structural bolts; ASTM A563 heavy hex carbonsteel nuts; ASTM F436 hardened carbonsteel washers.
Finish: Plain, unless noted otherwise.
Shear Stud Connectors: ASTM A108, Grades 1015 through 1020, headedstud type, coldfinished carbonsteel; AWS D1.1, TypeB.
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Structural Steel Framing
MPS Master
SECTION 05 12 00
Anchor Rods: ASTM F1554, Grade 36.
Configuration: Straight, headed, and nutted.
Nuts: ASTM A563 heavy hex carbon-steel.
Plate Washers: ASTM A36 carbon-steel.
Washers: ASTM F436 hardened (high-strength) carbon-steel.
Finish: Plain, unless noted otherwise.
ACCESSORY MATERIALS
Welding Electrodes: AWS Specifications, Serial DesignationA233, TypeE70XX electrodes, unless otherwise indicated on Structural Drawings, in accordance with AWS requirements.
Shop Coat Primer:
Fabricator’s standard rustinhibiting primer containing no leadbearing components and meeting current Federal and State regulations concerning lead in paint, and similar to No.4080 Red Oxide Zinc Chromate Primer (Hentzen Coatings, Inc.), for interior, normally dry environment.
For more severe exposure than those specified above and for architecturally exposed steel, submit proposed primer with Shop Drawings.
FABRICATION
General Shop Fabrication and Assembly Requirements:
Fabrication Standards: Fabricate structural steel in accordance with approved Shop Drawings and with AISC “Specifications for Structural Steel Buildings Allowable Stress Design and Plastic Design”.
Shop Fabrication: Fabricate and assemble members in shop to greatest extent possible.
Camber: Provide camber in structural steel members where indicated. Clearly mark cambered flange.
Fabrication of Members to be Shop Finished:
Complete structural steel assemblies, including welding of units, before start of shop priming operations.
Provide finish surfaces of members exposed in final structure which are free of markings, burrs, and other defects.
Marking Members: Provide markings which will not be exposed at Project completion.
Mark members for identification as to location for which each is intended.
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Structural Steel Framing
MPS Master
SECTION 05 12 00
Matchmark members requiring field assembly.
Take field measurements as required to verify and supplement dimensions shown on Drawings.
Builtup sections assembled by welding shall be free of warpage, and all axes shall have true alignment.
Welds not specified shall be continuous fillet welds, using not less than minimum fillet as specified by AWS.
Holes:
Provide holes for shop and field installed bolts.
Provide holes required for attaching work of others to structural steel members and to provide for passage of other work through members as indicated on Contract Documents or approved shop drawings, and as approved by Structural Engineer.
Coordinate locations and sizes of holes required with related trades and show on final Shop Drawings, as approved by Structural Engineer.
Provide welded on threaded nuts at holes and provide other specialty items when required for attaching work of others, as coordinated with trade(s) requiring such items, as shown on Contract Documents or approved Shop Drawings, and as approved by Structural Engineer.
Cut or drill holes perpendicular to metal surfaces unless otherwise indicated on Contract Documents.
Do not gas burn/cut (thermal or flamecut) holes or enlarge holes by burning.
Provide only drilled holes in base plates and bearing plates.
Connections:
Shop Connections: Weld shop connections, unless bolted connections are indicated on Contract Drawings or on final Shop Drawings.
Field Connections:
Bolt field connections, unless welding is indicated on Contract Drawings or on final Shop Drawings.
Provide bolts and washers required for completion of field erection.
Threads of bolts shall not bear on connecting steel.
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Structural Steel Framing
MPS Master
SECTION 05 12 00
Bolted Connections: Use highstrength bolts complying with ASTM A325 or A490 unless otherwise indicated.
Use standard bolts, in accordance with ASTM A307, only for temporary bracing to facilitate erection.
Welded Connections: In accordance with AWS D1.1 for welding procedure specifications, tolerances, appearance, and quality of welds, and for methods used in correcting welded work. Field and shop welds shall be by certified welders only. Certificates shall be available for inspection.
Surface Preparation: Hand or power tool clean surfaces to be welded by wire brushing, chipping, or hammering to remove scale, rust, paint, and other foreign matter.
Welding Process: Weld by shieldarc process, using coated rods, in accordance with current AWS specifications.
Assemble and weld builtup sections by methods that will maintain true alignment of axes without exceeding tolerances of AISC “Code of Standard Practice for Buildings and Bridges” for mill material.
Inspection of Welds:
Promptly after welding, wire brush and inspect each weld.
Weld shall show uniform sections, smoothness of weld material, feather edges without overlaps, and freedom from porosity and clinkers.
Each weld shall show good fusion with and penetration into base metal.
Finishing Completed Welds: After welding is completed, remove excess weld material and scale by grinding, chipping or brushing and leave welded areas in a smooth, clean, acceptable condition.
Base Plates: Shop weld base plates to columns. Weld continuous all around column, unless otherwise indicated on Structural Drawings.
Bearing Plates: Refer to Structural Drawings for welding of structural steel members to bearing plates which bear on concrete or masonry construction.
Splicing:
Splice members only where indicated unless, with Structural Engineer’s approval, splices not indicated would result in lower costs due to reduced shipping costs.
Submit structural calculations and details signed by a structural engineer, licensed where Project is located, for splices not indicated on Structural Drawings.
Steel Beam and Plate Lintels: Unless otherwise indicated on Structural Drawings:
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Structural Steel Framing
MPS Master
SECTION 05 12 00
Fabricate beam and plate lintels to bear not less than 8inches on solid masonry at each side of opening.
Extend plate full length of beam, unless noted otherwise.
Cope each side of plate so plate is 2inches narrower than nominal width of masonry wall for full length of bearing portion of plate.
Weld plate to both sides of bottom flange of beam as indicated on Structural Drawings.
SHOP PRIMING
Surface Preparation: Prepare surfaces which are to be primed by removing loose rust, mill scale, splatter, slag, and flux deposits. Unless otherwise indicated, prepare surfaces in accordance with SSPCSP2.
Shop Primer Application: After steel members are completely fabricated and surfaces are prepared, unless otherwise indicated, apply a coat of shop primer by dipping or spraying.
Promptly after surface preparation, apply primer in accordance with primer manufacturer=s recommendations.
Use methods that will cover exposed surfaces with primer, including joints, corners, and edges, to provide a continuous dry film thickness of not less than 1.5mils.
General Finishing Requirements:
Surfaces to Receive Primer:
Apply shop primer on structural steel, except members or portions of members specified as surfaces not to receive primer.
Apply (2)coats of primer on surfaces which will be inaccessible after shop assembly or Project site erection.
Change color of second primer coat to distinguish it from the first coat.
Apply a coat of shop primer on zinc coated (galvanized) surfaces which are to receive a Project site applied paint finish, unless otherwise indicated.
Surfaces not to Receive Primer:
Surfaces at connections to be Project site welded or bolted.
Structural steel members to be completely embedded in castinplace concrete.
Portions of structural steel members to be partially embedded in castinplace concrete, except extend primer 2inches into embedment area.
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Structural Steel Framing
MPS Master
SECTION 05 12 00
Galvanized surfaces unless otherwise indicated.
Exterior galvanized surfaces which are to receive a Project site (field) applied high performance coating system.
Structural steel surfaces to receive Project site applied sprayed on fireproofing.
GALVANIZING
Hot-Dip Galvanized Finish: Apply zinc coating by hotdip process to structural steel in accordance with ASTM A123/A123M.
Galvanize lintels located in exterior walls.
PART - EXECUTION
EXAMINATION
Verification of Conditions:
Examine areas and conditions under which Work of this Section will be performed.
Verify elevations of concrete and masonry bearing surfaces, and locations of anchor rods, bearing plates, and other embedments, for compliance with requirements.
Do not proceed with erection work until unsatisfactory conditions have been corrected.
Coordination: Coordinate installation by others of anchor rods and other anchorage devices required for securing structural steel to foundations and other inplace work.
Furnish templates and other devices as needed for presetting of anchor rods and other anchorage devices to accurate locations.
PREPARATION
Temporary Shoring and Bracing: