ST. VINCENT COLLEGE SIS AND HERMAN DUPRÉ SCIENCE PAVILION
SECTION 05 12 00 - STRUCTURAL STEEL
PART 1 - GENERAL
1.01 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.
1.02 SECTION SUMMARY
A. Section includes the following:
1. Structural steel for building construction and related anchors, fasteners and connectors. 2. Architecturally exposed structural steel truss system; to support glass curtainwall. 3. Miscellaneous steel tubing, shapes, bars and plates. 4. Connections to existing structural steel. 5. Shop priming of steel and/or galvanizing of steel. 6. Testing of field connections.
1.03 RELATED SECTIONS
A. Related Sections include the following:
1. Section 03 30 00 - Cast-in-Place Concrete; Shrinkage Resistant Grout. 2. Section 04 20 00 - Unit Masonry. 3. Section 05 30 00 - Metal Decking; Shear Connections. 4. Section 05 50 00 - Metal Fabrications. 5. Section 07 25 00 - Spray-on Fireproofing; intumescent paint. 6. Section 09 90 00 – Painting.
1.04 REFERENCES
A. AISC: American Institute of Steel Construction. B. ASTM: American Society for Testing Materials.
1.05 SUBMITTALS
A. Product Data: Submit producer's or manufacturer's specifications and installation instructions for following products. Include laboratory test reports and other data to show compliance with specifications (including specified standards).
1. Structural steel (each type), including certified copies of mill reports covering chemical and physical properties. 2. High-strength bolts (each type), including nuts and washers. 3. Structural steel primer paint, all types specified.
B. Shop Drawings: Submit shop drawings prepared under supervision of a registered professional engineer, including complete details and schedules for fabrication and assembly of structural steel members,
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procedures and diagrams.
1. Include details of cuts, connections, camber, holes, and other pertinent data. Indicate welds by standard AWS symbols, and show size, length, and type of each weld.
2. Provide setting drawings, templates, and directions for installation of anchor bolts and other anchorages to be installed by others.
3. Indicate type, size and length of bolts, distinguishing between shop and field bolts. Identify high-strength bolted slip-critical, direct-tension or tensioned shear/bearing connections.
C. Mill Test Reports: Signed by manufacturers certifying that the following products comply with requirements:
1. Structural steel including chemical and physical properties. 2. Bolts, nuts, and washers including mechanical properties and chemical analysis. 3. Direct-tension indicators. 4. Tension-control, high-strength bolt-nut-washer assemblies. 5. Shear stud connectors. 6. Shop primers. 7. Nonshrink grout.
D. LEED Documentation: Provide certification documentation that recycled steel content of structural steel meets LEED requirements.
1.06 QUALITY ASSURANCE
A. Codes and Standards: Comply with provisions of following, except as otherwise indicated.
1. AISC "Code of Standard Practice for Steel Buildings and Bridges, 9th Edition."
2. AISC "Specifications for Architecturally Exposed Structural Steel."
3. AISC "Specifications for Structural Joints using ASTM A 325 or A 490 Bolts" approved by the Research Council on Riveted and Bolted Structural Joints of the Engineering Foundation.
4. AISC "Specification for Structural Steel Buildings-Allowable Stress Design and Plastic Design." With commentary 6/1/1981.
5. AWS D1.1 "Structural Welding Code."
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6. SSPC - Steel Structures Painting Council.
7. ASTM A6(ASTM A6M) - Specification for General Requirements for rolled steel plates, shapes, sheet piling, and bars for structural use.
B. Qualifications for Welding Work: Qualify welding processes and welding operators in accordance with AWS "Standard Qualification Procedure."
1. Provide certification that welders to be employed in work have satisfactorily passed AWS qualification tests and if pertinent has undergone recertifications.
C. Fabricator's Qualifications: Fabricator must participate in the AISC Quality Certification Program and be designated an AISC - Certified Plant, Category I conventional steel building structures.
1.07 DELIVERY, STORAGE AND HANDLING
A. Deliver materials to site at such intervals to insure uninterrupted progress of work.
B. Deliver anchor bolts and anchorage devices, which are to be embedded in cast-in-place concrete, existing concrete or masonry, in ample time not to delay work. Provide setting diagrams, templates, instructions and directions, as required for installation.
C. Store materials to permit easy access for inspection and identification. Keep steel members off ground, using pallets, platforms, or other supports. Protect steel members and packaged materials from erosion and deterioration.
D. Do not store materials on structure in a manner that might cause distortion or damage to members of supporting structures. Repair or replace damaged materials or structures as directed.
E. Store fasteners in a protected place. Clean and relubricate bolts and nuts that become dry or rusty before use.
PART 2 - PRODUCTS
2.01 MATERIALS
A. Metal Surfaces, General: For fabrication of work which will be exposed to view, use only materials which are smooth and free of surface blemishes including pitting, seam marks, identification or grade stamps, roller marks and roughness. Remove such blemishes by grinding, or by welding and grinding, prior to cleaning, treating and application of surface finishes.
1. Metal Surfaces; architecturally exposed structural steel
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supporting curtainwall: SSPC-SP-11/ Power Tool cleaning to bare metal; architecturally exposed structural steel. All exposed welds to be ground smooth to tolerances as set forth by the Architect.
2. Metal Surfaces; not "architecturally" exposed structural steel, thus tolerances in erection and fabrication, surface preparation and finish are more relaxed. Surface preparation; SSPC-SP-2 Hand Tool Cleaning, all exposed welds to be ground smooth to tolerances as set forth by the Architect.
3. Steel to contain high-recycled-content steel; minimum of 90% recycled material (75% post-consumer steel).
B. Materials include the following:
1. Structural Steel Shapes, except bars, angles, channels and plates - A-922 Grade 50 having a minimum yield strength of 50 ksi or A-572, Grade 50 having a minimum yield strength of 50 ksi unless noted otherwise on the plans. Steel bars, angles, changes and plates shall be A-36 having a minimum yield strength of 36 ksi unless noted 50 ksi on the plans in which case they shall be ASTM A-572 Grade 50.
2. Cold-Formed Steel Tubing: ASTM A 500, Grade B (Fy - 45ksi).
3. Steel Pipe: ASTM A-501(Fy = 35 ksi)or A 53, Type E or S, Grade B (Fy = 35 ksi). Weight class and finish as indicated.
4. Square and rectangular tubing-A500, Grade B (Fy = 46ksi).
5. Anchor Bolts: shall conform to the ASTM designation, latest edition: ASTM F-1554 Grade 36, unless noted otherwise on the drawings. Anchor bolts shall be snug tight unless noted "slip critical or S.C." on the drawings.
6. Unfinished bolts and nuts: ASTM A 307, Grade A.(ASTM F 568, Property Class 4.6)
7. High-Strength Threaded Fasteners: Heavy hexagon structural bolts, heavy hexagon nuts, and hardened washers, as follows:
a. Quenched and tempered medium-carbon steel bolts, nuts and washers, complying with ASTM A 325, Type 1. b. All bolts shall be snug tight unless noted "slip critical or S.C." on the drawings.
8. Electrodes for Welding: Comply with AWS Code and ASTM A233, latest edition, E-70 series of specification for mild steel arc welding electrodes.
a. New steel use E70XX electrodes. b. Existing steel use E60XX electrodes. (Test existing
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steel prior to welding). c. For high-strength low-alloy steel; provide electrodes, welding rods and filler metals equal in strength and compatible in appearance with parent metal joined.
9. Shear Connections: Refer to specification Section 05 30 00 - Metal Decking.
10. Galvanizing: Provide a zinc coating (Hot-Dip Galvanizing) for those items which are exposed to weathering, indicated on the drawings or specified to be galvanized. ASTM A123.
11. Structural Steel Primer Paint: Shop applied primer.
a. Red Iron Oxide Acrylic Primer (Without Lead) as recommended by fabricator, conforming to requirements of FS TT-P-664. Low VOC content meeting LEED requirements. b. Galvanizing Repair Paint: for re-galvanizing welds and repair painting galvanized steel, with dry film containing not less than 93 percent zinc dust by weight, and complying with DOD-P-21035A or SSPC-Paint-20. Low VOC content meeting LEED requirements.
12. Thermal Break Material: Neoprene pads.
a. Manufacturer: Balco Inc. b. Hardness: ASTM D2240; minimum 70 durometer. c. Size: As required.
13. Deformed Bar Anchors: Deformed reinforcing bar anchors, such as D2L by Nelson Division or T.R.W, or equal by Cox Industries welded to the structural steel by automatic welding process. (Not stick welded.)
2.02 FABRICATION
A. Shop Fabrication and Assembly: Fabricate and assemble structural assemblies in shop to greatest extent possible. Fabricate items of structural steel in accordance with AISC Specifications and as indicated on final shop drawings.
B. Properly mark and match-mark materials for field assembly. Fabricate for delivery sequence which will expedite erection and minimum field handling of materials.
C. Where finishing is required, complete assembly, including welding of units, before start of finishing operations.
D. Connections: Weld or bolt shop connections, as indicated.
1. Bolt field connections, except where welded connections or other connections are indicated.
2. Provide high-strength threaded fasteners for bolted structural
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steel connections, except where unfinished bolts are indicated. 3. Provide unfinished threaded fasteners for only bolted connections of secondary framing members to primary members (including purlins, girts, and other framing members taking only nominal stresses) and for temporary bracing to facilitate erection.
E. High-Strength Bolted Construction: Install high-strength threaded fasteners in accordance with AISC "Specifications for Structural Joints using ASTM A 325 Bolts."
F. Welded Construction: Comply with AWS Code for procedures, appearance and quality of welds, and methods used in correcting welding work.
1. Assemble and weld built-up sections by methods which will produce true alignment of axes without warp.
2. For high-strength low-alloy steels, follow welding procedures as recommended by steel producer for exposed and concealed connections.
G. Steel Column Framing: Select members which are true and straight for fabrication. Straighten as required to provide uniform, plumb and true members in completed framing.
H. Holes for Other Work: Provide holes required for securing other work to structural steel framing, and for passage of other work, including sprinkler lines, conduit & plumbing lines, through steel framing members, as shown on final shop drawings. Location of holes to be reviewed by structural engineers.
1. Provide threaded nuts welded to framing, and other specialty items as indicated to receive other work. 2. Cut, drill, or punch holes perpendicular to metal surfaces. Do not flame cut holes or enlarge holes by burning. Drill holes in bearing plates.
J. Thermal cutting - perform thermal cutting by machine to greatest extent possible.
1. Plane thermally cut edges to be welded.
K. Finishing: Accurately mill ends of columns and other members transmitting loads by bearing.
L. The structure is designed to be self-supporting and stabile after the building is completed. It is the contractor’s sole responsibility determine erection procedure and sequence and to insure stability of the building and it’s component parts and adequacy of temporary support during erection. This includes the addition of whatever temporary bracing, guy or tie downs that might be necessary. If applied, they shall be removed as conditions
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permit and shall remain the Contractor’s property.
2.03 SHOP PAINTING AND GALVANIZING
A. General: Shop prime structural steel, except those members or portions of members to be embedded in concrete or mortar and these members noted to be galvanized. Paint embedded steel which is partially exposed on exposed portions and initial 2 inches(50mm) of embedded areas only. Hot dip galvanize structural steel permanently exposed to weather in the finished work and where noted to be galvanized.
1. Do not paint surfaces which are to be welded.
2. Do not paint surfaces which are to receive spray-on fireproofing.
3. Apply two coats of paint to surfaces which are inaccessible after assembly or erection. Change color of second coat to distinguish it from first.
B. Surface Preparation: After inspection and before shipping, clean steelwork to be painted. Remove loose rust, loose mill scale, and spatter, slag, or flux deposits. Clean steel in accordance with Steel Structures Painting Council (SSPC) as follows:
1. SSPC-SP-2 Hand Tool Cleaning; concealed structural steel. 2. SSPC-SP-11 Power Tool cleaning to bare metal; architecturally exposed structural steel, to support curtainwall.
C. Shop Primer: Immediately after surface preparation, apply structural steel primer paint in accordance with manufacturer's instructions and at a rate to provide dry film thickness of not less than 1.5 mils(0.038mm). Use priming methods that result in full coverage of joints, corners, edges and exposed surfaces.
1. Use slow drying primer, similar to Tnemec 1099. Low VOC content meeting LEED requirements.
PART 3 - EXECUTION
3.01 ERECTION
A. Surveys: Check elevations of concrete and masonry bearing surfaces, and locations of anchor bolts and similar devices before erection work proceeds, and report discrepancies to Architect. Do not proceed with erection until corrections have been made, or until compensating adjustments to structural steel work have been agreed upon with Architect.
B. Temporary Shoring and Bracing: Provide temporary shoring and bracing members with connections of sufficient strength to bear imposed loads. Remove temporary members and connections when sheer walls are in place and final connections are made. Provide
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temporary guy lines to achieve proper alignment of structures as erection proceeds. Permit masonry shear walls to cure for one week after their construction prior to removing temporary bracing.
C. Temporary Planking: Provide temporary planking and working platforms as necessary to effectively complete work.
D. Anchor Bolts: Furnish anchor bolts and other connectors required for securing structural steel to foundations and other in-place work.
1. Furnish templates and other devices as necessary for presetting bolts and other anchors to accurate locations.
E. Setting Bases and Bearing Plates: Clean concrete and masonry bearing surfaces of bond-reducing materials and roughen to improve bond to surfaces. Clean bottom surface of base and bearing plates.
1. Set loose and attached base plates and bearing plates for structural members on wedges or other adjusting devices.
2. Tighten anchor bolts after supported members have been positioned and plumbed. Do not remove wedges or shims, but if protruding, cut off flush with edge of base or bearing plate prior to packing with grout.
3. Pack grout solidly between bearing surfaces and bases or plates to ensure that no voids remain. Finish exposed surfaces, protect installed materials, and allow to cure. Comply with grout manufacturers instructions.
F. Field Assembly: Set structural frames accurately to lines and elevations indicated. Align and adjust various members forming part of complete frame or structure before permanently fastening. Clean bearing surfaces and other surfaces which will be in permanent contact before assembly. Perform necessary adjustments to compensate for discrepancies in elevations and alignment.
1. Level and plumb individual members of structure within specified AISC tolerances.
2. Establish required leveling and plumbing measurements on mean operating temperature of structure. Make allowances for difference between temperature at time of erection and mean temperature at which structure will be when completed and in service.
3. Splice members only where indicated and accepted on shop drawings.
4. Erection Bolts - On exposed welded construction, remove erection bolts, fill holes with plug welds and grind smooth at exposed surfaces.
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G. Comply with AISC Specifications for bearing, adequacy of temporary connections, alignment, and removal of paint on surfaces adjacent to field welds.
H. Do not enlarge unfair holes in members by boring or by using drift pins, except in secondary bracing members. Ream holes that must be enlarged to admit bolts.
I. Gas Cutting: Do not use gas cutting torches in field for correcting fabrication errors in primary structural framing. Cutting will be permitted only on secondary members which are not under stress, as acceptable to Architect. Finish gas-cut sections equal to a sheared appearance when permitted.
J. Touch-up Painting: Cleaning and touch-up painting of field welds, bolted connections and abraded areas of shop paint on structural steel. Use same primers as specified in this section of the specifications.
1. Touch-up galvanized surfaces with galvanizing repair paint, according to ASTM A780.
K. Field connections:
1. Install and tighten non high-strength bolts, except where high strength are indicated.
2. Install and tighten high-strength bolts according to RCSC's Specification for Structural Joints using ASTM A325 and A490 bolts.
3. Bolts: ASTM A325 high strength bolts, unless otherwise indicated.
4. Connection type: Snug tightened, unless otherwise indicated.
L. Weld Connections: Comply with ANSI/AWSD1.1 for procedures, appearance and quality of welds, and methods used in correcting welding work.
1. Comply with AISC specifications referenced in this section for bearing, adequacy of temporary connections, alignment and removal of paint on surfaces adjacent to field welds.
2. Verify that weld sizes, fabrication sequence and equipment used for architecturally exposed structural steel will limit distortions to allowable tolerances. Prevent surface bleeding of back-side welding on exposed steel surfaces. Grind smooth exposed fillet welds 3/16 inch (3mm) and larger. Grind flush butt welds. Dress exposed welds.
M. Waste Management: Recycle offcuts and scrap.
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3.02 TESTING AND INSPECTION
A. The Owner will employ and pay all costs for the services of an approved testing laboratory, whose duties it shall be to inspect and test the shop and the field connections for conformance to this specification. The testing laboratory shall submit, on their own letterheads, reports on their inspections to the Architect, Owner and Contractor. Submit test reports in triplicate.
B. Testing laboratory shall review mill test reports, verify identity of steel with respect to mill test reports, and, if found to comply with specification requirements, so certify to the Architect.
C. Welded Connections: All shop and field welds shall be inspected in accordance with Section VI of the AWS Structural Welding Code, D1.1 latest edition, and the following:
1. Visually inspect all welded connections.
2. Liquid Penetrant Inspection: ASTM E 165.
3. Inspect 10% of fillet weld connections by means of magnetic particle testing, ASTM E 709; performed on root pass and on finished weld. Cracks or zones of incomplete fusion or penetration will not be accepted.
4. Radiographic Inspection: ASTM E 94 and ASTM E 142; minimum quality level "2-2T".
3. Inspect 10% of full penetration welds by ultrasonic testing, ASTM E 164.
D. Bolted Connections: Test bolted connections in accordance with AISC and RCSC's "Specification for Structural Joints Using ASTM A325 and A490 Bolts" requiring that 10% of the installed bolts, but not less than 2 bolts, of each connection be tested.
1. Visually inspect all bolted connections.
E. Shear Connectors: Test according to AWS D1.1; bond tests will be performed when visual inspections reveal either less than a continuous 360-degree flash or welding repairs to any shear connector. Tests will be conducted on additional shear connectors when weld fractures occur on shear connectors already tested, according to requirements of AWS D1.1.
F. Perform additional tests as may be necessary to reconfirm any noncompliance of the original work, and as may be necessary to show compliance of corrected work.
END OF SECTION
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