PREFABRICATED STEEL TRUSS BRIDGE
PART 1 GENERAL
1.1SECTION INCLUDES
A.Prefabricated, steel truss bridge used for shared use paths including
bridge bearings, timber decking and anchorages.
1.2RELATED SECTIONS
A.Section 02821: Chain Link Fencing and Gates
B.Section 05120: Structural Steel
C.Section 05822: Elastomeric Bearings
D.Section 06055: Timber and Timber Treatment
1.3REFERENCES
A.AASHTO M 270: Structural Steel for Bridges
B.AASHTO LRFD Bridge Design Specifications
C.AASHTO LRFD Guide Specifications for the Design of Pedestrian Bridges
D.AASHTO Guide Specifications for LRFD Seismic Bridge Design
E.AASHTO/AWS D1.1: Structural Welding Code
F.ASTM A 240: Chromium and Chromium-Nickel Stainless Steel Plate,
Sheet, and Strip for Pressure Vessels and for General Applications
G.American Institute of Steel Construction (AISC)
H.UDOT Quality Control/Quality Assurance (QC/QA) Procedures
I.UDOT Structures Design and Detailing Manual (SDDM)
Prefabricated Steel Truss Bridge
1.4DEFINITIONS Not Used
1.5SUBMITTALS
A.Working Drawings
1.Detailed shop drawings of fabricated materials for review.
a.Designate Charpy V-notch requirements.
b.Include design calculations for each truss bridge and bridge
deck. 1) Certify that the design has been checked according to the UDOT Quality Control/Quality Assurance (QC/QA) Procedures.
c.Include geometry verification stating that the dimensions,
elevations, and layout of the truss are consistent with the substructure shown.
d.Include anchor bolt diameter, layout and bearing loads.
e.Provide a Professional Engineer (PE) or Professional
Structural Engineer (SE) seal and signature on shop drawings and calculations.
2.Erection drawings according to Section 05120
3.Drawings for temporary works, if applicable, according to Section
05120
B.Documentation for AISC Bridge Fabricator Certification for information.
1.6MANUFACTURER EXPERIENCE
A.Minimum of five years of experience designing and manufacturing welded
prefabricated steel truss bridges for pedestrian and vehicle loads.
B.AISC Certified Bridge Fabricator – Intermediate Certification (IBR).
PART 2 PRODUCTS
2.1STRUCTURAL STEEL
A.Refer to Section 05120.
1.Stock steel purchased from a warehouse can be used in the
fabrication of prefabricated steel truss bridges.
B.Fracture critical requirements are waived except for Charpy V-notch
testing.
1.Meet AASHTO M 270 zone 2 Charpy V-notch fracture critical
testing requirements for main tension members.
Prefabricated Steel Truss Bridge
2.2HIGH STRENGTH FASTENERS
A.Refer to Section 05120.
2.3ELASTOMERIC BEARINGS AND ANCHORAGES
A.Refer to Section 05822.
2.4TIMBER DECKING
A.Treated, Structural Timber and Lumber. Refer to Section 06055.
B.S4S, Heart Center (HC), Douglas Fir, Grade No. 2 or better.
2.5CHAIN LINK FENCE
A.Refer to Section 02821.
2.6JOINT COVER PLATE
A.Provide minimum 3/8-inch thick stainless steel plate with an anti-slip
surface.
1.Chamfer plate edges that are perpendicular to the travel direction.
a.Use a 2 to 1, horizontal to vertical, chamfer down to a 1/8-
inch plate thickness.
2.Refer to ASTM A240.
B.Provide stainless steel fasteners to attach the plate to the concrete as
shown.
1.Install fasteners flush with the surface of the cover plate.
2.7DESIGN
A.Design prefabricated steel truss bridge and deck according to current
editions of the AASHTO LRFD Bridge Design Specifications, the AASHTO LRFD Guide Specifications for the Design of Pedestrian Bridges, the AASHTO Guide Specifications for LRFD Seismic Bridge Design and the SDDM.
1.Design and detail the bridge to accommodate a “Cold Climate”
temperature differential according to procedure A in the AASHTO LRFD Bridge Design Specifications.
2.Provide at least a 6-inch thick concrete deck.
Prefabricated Steel Truss Bridge
3.Use shear studs on the floor beams that extend vertically at least to
the center of the deck.
4.Provide at least 2-inch clear cover to the top mat of reinforcing steel
and to shear studs.
B.Verify that the clear span, clear width, elevations, and geometry shown
are consistent with the truss bridge to be used at the site.
C.Use two parallel trusses with at least one diagonal element in each panel
consistent with the layout, clear width, and span shown.
1.The trusses must be main load-carrying members of the bridge.
2.Orient vertical truss members so they appear perpendicular to the
bridge profile grade after the bridge is erected and dead loads are applied.
3.Use hollow structural sections (HSS) for the members of each truss
(upper and lower chords, diagonals, end posts, and vertical posts).
D.Use steel structural shapes or HSS for the floor beams and stringers.
E.Provide structural steel thickness of at least ⅜ inch.
F.Provide drilled ½ inch diameter weep holes at the low points of HSS
members as oriented in the in-place, completed structure.
1.Flame cut holes are prohibited.
2.Provide one weep hole at each end in members that are level or
flat.
2.8FABRICATION
A.The following supplements the requirements in Section 05120:
1.Fabricate welded HSS connections according to AWS D1.1.
a.Meet the AASHTO M 270 zone 2 Charpy V-notch testing
requirements for fracture critical members for main tension members.
2.Timber Decking
a.Pre-drill timber deck for connections to floor beams.
b.Smooth exposed edges with ⅛ inch radius.
PART 3 EXECUTION
3.1GENERAL
A.Follow the authorized working drawings.
Prefabricated Steel Truss Bridge
3.2JOINT COVER PLATE
A.Attach the joint cover plate to the abutment backwall or deck as shown.
END OF SECTION
Prefabricated Steel Truss Bridge
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Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1139–1143 of 1,331.
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