TS-4d M 180-1 AASHTO
Standard Specification for
Corrugated Sheet Steel Beams for
Highway Guardrail
AASHTO Designation: M 180-00 (2004)
1. SCOPE
1.1.
This specification covers corrugated sheet steel prepared for u as beams in highway guardrails. 1.2. The values stated in SI units are to be regarded as the standard.
2. REFERENCED DOCUMENTS
2.1. AASHTO Standards :
M 120, Zinc
M 232M/M 232, Zinc Coating (Hot-Dip) on Iron and Steel Hardware
M 291M, Carbon and Alloy Steel Nuts [Metric]
M 298, Coatings of Zinc Mechanically Deposited on Iron and Steel
T 65M/T 65, Mass [Weight] of Coating on Iron and Steel Articles with Zinc or
Zinc-Alloy Coatings
2.2. ASTM Standards :
A 307, Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength
A 653/A 653M, Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-
Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
E 376, Standard Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-
Current (Electromagnetic) Test Methods
F 568M, Standard Specification for Carbon and Alloy Steel Externally Threaded Metric
Fasteners
2.3. ANSI Standards :
B1.13M, Metric Screw Threads D M Profile
B18.2.4.1M, Hex Nuts, Style 1, Metric
B18.2.4.6M, Hex Nuts, Heavy, Metric
2.4.
Military Standard :
DOD-P-21035, Paint, High Zinc Dust Content, Galvanizing Repair (Metric) 3. CLASSIFICATION
3.1. Four types and two class of guardrail are provided as follows:
Copyright American Association of State Highway and Transportation Officials
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Provided by IHS under licen with AASHTO
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3.1.1. Types:
Type I—Zinc coated, 550 g/m2 (1.80 oz/ft2) minimum single-spot.
Type II—Zinc coated, 1100 g/m2 (3.60 oz/ft2) minimum single-spot.
Type III—Beams to be painted.
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Type IV—Beams of corrosion resistant steel.
3.1.2. Class:
Class A—Ba metal nominal thickness—2.67 mm (0.105 in.).
Class B—Ba metal nominal thickness—3.43 mm (0.135 in.).
4. ORDERING
INFORMATION
4.1. Orders for guardrail under this specification shall include the following information, as required,
to adequately describe the desired material:
4.1.1. Quantity (linear meter or number of pieces),
4.1.2. Class of Guardrail,
4.1.3. Type of Guardrail,
4.1.4. Effective length of beam ction 3.8 or 7.6 m (12.5 ft or 2
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5.0 ft),
4.1.
5. Shape (W-Beam or Thrie Beam), and
4.1.6. Exceptions to this specification or special requirements, if any.
5. BASIS OF ACCEPTANCE
5.1. All material shall be subject to inspection and sampling at the fabricating plant, warehou, or
after delivery to the site of construction.
5.2. Acceptance by Sampling:
5.2.1. The engineer may take one piece of guardrail, a backup plate, and end or buffer ction from each长与短
200 pieces in a lot, or from each lot if less than 200 pieces are included therein, for determination
of compliance with specification requirements. If one piece fails to meet, two other pieces shall be
tested. If either of the pieces fails to conform to the requirements of this specification, the lot of
material reprented by the samples shall be rejected. A lot shall be considered that quantity of
material offered for inspection at one time which bears the same heat and coating identification.
5.3. Acceptance by Brand Registration and Guarantee:
5.3.1. By mutual agreement between the fabricator and engineer, acceptance may be bad upon a Brand
Registration and Guarantee filed with the engineer by the fabricator. For acceptance of a brand,
the fabricator shall furnish a Brand Registration and Guarantee meeting the approval of the
engineer and showing the brand name or designation, the manner in which it will appear on the
fabricated beams, the typical mechanical properties, chemical composition if specified, the class
and type of guardrail, and other specified properties. The fabricator shall also guarantee that as
TS-4d M 180-3 AASHTO long as material is furnished under that brand and designation, it will conform fully to the
requirements of the specification and shall be replaced without cost to the engineer when found
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not in conformity with any of the specified requirements. The Brand Registration and Guarantee
shall be sworn to for the fabricator by a person having legal authority to bind the company. Upon
approval of a Brand Registration and Guarantee, that brand will be accepted without further
certification. If, in subquent actual field u, there is evidence of misbranding as determined by
random sampling and detection of inadequate tensile strength, yield strength, elongation, improper
coating, deficient thickness or improper fabrication, the material will be rejected and approval for
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further u withdrawn until subquently reapproved. Samples for test of any material offered for
上海习俗u may be taken at any time deemed desirable by the engineer.
5.3.2. The manufacturer or fabricator shall make such tests and measurements as necessary to insure that
the material produced complies with all specification requirements. The tests and measurements
shall be so identified by the identification symbols or code ud on the beam that the manufacturer
can produce specific reports showing the test results. Copies of reports of the tests shall be
kept on file and shall be submitted to the engineer upon request.
5.3.3.
The brand shall be removed or obliterated by the manufacturer or fabricator on all material where
董贤control tests, as outlined herein, do not show conformance to this specification. 6. MATERIALS
6.1. Ba Metal —The beam, transition, end, and buffer ctions shall consist of sheet made of open
hearth, electric furnace or basic oxygen steel and shall meet the mechanical properties specified in
Section 8. The chemical composition of the ba metal for Type IV beams shall be as approved by
the engineer.
6.2. Zinc —The zinc ud for the coating of Type I and II ctions shall be as prescribed in M 120, and
shall be at least equal to the grade designated as “Prime Western.”
6.3. Bolts and Nuts :
6.3.1. Unless otherwi specified, bolts and nuts for Types I, II, and III beams shall conform to or exceed
the requirements of ASTM A 307 and shall be coated in accordance with Section 9.4.
6.3.2. Bolts and nuts for Type IV beams shall be of an approved corrosion resistant material and
conform to or exceed the requirements of ASTM A 307.
6.3.3.
All connections or splices shall be formed with oval shoulder button headed bolts to minimize
projections on the roadside of the guardrail. Splice and post bolts and nuts shall conform to one of
the configurations shown in Figure 1 or Figure 2. Either of the alternate configurations may be
furnished unless otherwi specified by the engineer. Copyright American Association of State Highway and Transportation Officials Provided by IHS under licen with AASHTO --`,,``,,-`-`,,`,,`,`,,`---
tolerances except where allowable tolerances are shown. Figure 1—15.88-mm (5/8-in.) Post or Splice Bolt and Nut --`,,``,,-`-`,,`,,`,`,,`---
TS-4d M 180-5 AASHTO
2. Nuts shall have ANSI B1.13M M16 × 2 Grade 6H threads. The geometry of the nuts, with the exception of the recess
shown in the drawing, shall conform to ANSI B 18.2.4.1M Style 1 for zinc-coated hex nuts and ANSI B18.2.4.6M heavy hex
corrosion resistant nuts shall conform to the requirements of M 291M for Class 8S3. Zinc-coated nuts shall be tapped over-size as
specified in M 291M, except that a diametrical allowance of 510 mm shall be ud instead of 420 mm. 3.
Dimensional tolerances not shown or implied are intended to be tho consistent with the proper functioning of the part, including
its appearance and accepted manufacturing practices.
Figure 2—16-mm Post or Splice Metric Bolt and Nut
6.4.鱼的腌制方法
Washers and Backup Plates : 6.4.1. Washers shall be rectangular as shown in Figure 3. Washers for Types I, II, and III beams shall be
galvanized in accordance with Section 9. Washers for Type IV beams shall be of an approved
corrosion resistant steel. Back-up plates if specified for u at non-splice points shall consist of
305-mm (1-ft) ctions of beams and shall be of the same Class and Type specified for the full-
length beams.
6.5. End or Buffer Sections :
6.5.1.
End or buffer ctions shall be of the same or greater thickness of metal and the same type as the
beam to which it is attached or the engineer may specify the minimum thickness of metal and type. Copyright American Association of State Highway and Transportation Officials
Provided by IHS under licen with AASHTO
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