SECTION 05100
STRUCTURAL METALS
PART 1--GENERAL
1.01
DESCRIPTION
This section specifies structural metals consisting of standard shapes, fasteners, rods and
plates that are used in structural supports and connections.
1.02
QUALITY ASSURANCE
A.
GENERAL:
Structural assemblies and shop and field welding shall meet the requirements of the AISC
Manual of Steel Construction.
The use of salvaged, reprocessed or scrap materials shall not be permitted.
B.
REFERENCES:
This section contains references to the following documents. They are a part of this section
as specified and modified. Where a referenced document contains references to other standards,
those documents are included as references under this section as if referenced directly. In the event
of conflict between the requirements of this section and those of the listed documents, the
requirements of this section shall prevail.
Unless otherwise specified, references to documents shall mean the documents in effect at
the time of Advertisement for Bids or Invitation to Bid (or on the effective date of the Agreement if
there were no Bids). If referenced documents have been discontinued by the issuing organization,
references to those documents shall mean the replacement documents issued or otherwise identified
by that organization or, if there are no replacement documents, the last version of the document
before it was discontinued. Where document dates are given in the following listing, references to
those documents shall mean the specific document version associated with that date, regardless of
whether the document has been superseded by a version with a later date, discontinued or replaced.
Reference
Title
AISC Manual of Steel
Construction
American Institute of Steel Construction, Manual of Steel
Construction, Allowable Stress Design - 9th Edition
ASTM A36/A36M
Structural Steel
ASTM A53
Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded
and Seamless
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Reference
Title
ASTM A283/A283M
Low and Intermediate Tensile Strength Carbon Steel
Plates, Shapes and Bars
ASTM A307
Carbon Steel Externally Threaded Standard Fasteners
ASTM A320/A320M
Alloy-Steel Bolting Materials for Low Temperature
Service
ASTM A500
Cold-Formed Welded and Seamless Carbon Steel
Structural Tubing in Rounds and Shapes
ASTM A666
Austenitic Stainless Steel, Sheet, Strip, Plate and Flat Bar
for Structural Applications
ASTM B308
Aluminum-Alloy Standard Structural Shapes, Rolled or
Extruded
AWS-B3.0
Welding Procedures and Performance Qualifications
AWS-Dl.1
Structural Welding Code--Steel
PART 2--PRODUCTS
2.01
MATERIALS
A.
STEEL:
Materials for structural metals shall be as specified in Table A.
Table A, Steel Materials
Material
Specification
Standard rolled steel sections
ASTM A36
Pipe columns
ASTM A53, Grade B
Structural steel tubing
ASTM A500, Grade B
Structural bars, plates and similar items
ASTM A36 or A283
Stainless steel
ASTM A666, Grade A, Type 304
Stainless steel bolts, nuts and washers
ASTM A320, Type 304
Steel bolts
ASTM A307, Grade A
B.
ALUMINUM:
Unless otherwise specified, aluminum shall be extruded from 6061-T6 or 6063-T6 alloy,
conforming to ASTM B308.
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2.02
FABRICATION
Fabrication shall be in accordance with the AISC Manual of Steel Construction.
PART 3--EXECUTION
3.01
INSTALLATION
A.
GENERAL:
Measurements shall be verified at the job.
Holes shall be punched 1/16 inch larger than the nominal size of the bolts, unless otherwise
specified. Whenever needed, because of the thickness of the metal, holes shall be subpunched and
reamed or drilled. No drifting of bolts nor enlargement of holes will be allowed to correct
misalignment. Mismatched holes shall be corrected with new material.
Dissimilar metals shall be protected from galvanic corrosion by means of pressure tapes,
coatings or isolators. Aluminum in contact with concrete or grout shall be protected with a heavy
coat of bituminous paint.
Metalwork to be embedded in concrete shall be as specified in Section 03300. Metalwork
shall be placed accurately and held in correct position while the concrete is placed or, if specified,
recesses or blockouts shall be formed in the concrete after design strength is attained, and the
metalwork shall be grouted in place in accordance with Section 03300. The surfaces of metalwork
in contact with or embedded in concrete shall be thoroughly cleaned.
Structural steel completely encased in concrete shall not be galvanized or painted and shall
have a clean surface for bonding to concrete. Metalwork which is bent, broken or otherwise
damaged shall be repaired or replaced by the Contractor.
B.
WELDING:
Welding shall be done by operators who have been qualified by tests as prescribed by
AWS WI Sect. 7 to perform the type of work required. The quality of welding shall conform to
AWS Code for Arc Welding in Building Construction Section 4, Workmanship.
Unless otherwise specified, continuous welds shall be provided on all structural members
that are exposed to weather or submerged in water or wastewater, and continuous seal welds shall
be provided on both sides of all plates or structural shapes that are in contact with or submerged in
water or wastewater.
C.
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BOLTED CONNECTIONS:
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Bolted connections shall conform to AISC Framed Beam Connections and shall be bearing
type connections with threads excluded from shear planes.
3.02
CORROSION PROTECTION
Unless otherwise specified, all structural metal and structural steel, including that used in the
fabrication of process equipment, shall be coated in accordance with Section 09900. Surface
preparation shall be as specified in paragraph 09900-3.02 and applicable COATSPECS and shall
include the following operations:
1.
Grind the exterior and interior edges of all flame-cut plates or members to a
smooth surface.
2.
Grind all sharp edges off of the sheared plates and punched holes.
3.
Grind uneven or rough welds with high beads to a smooth finish.
Application requirements shall be as specified in paragraph 09900-3.03 and applicable
COATSPECS.
3.03
CLEANING
After installation, damaged surfaces of shop primed metals shall be cleaned and touched up
with the same material used for the shop coat. Damaged surfaces of galvanized metals shall be
repaired as specified in Section 05910.
**END OF SECTION**
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