02530.70 1117 Section 02530 - Structural Steel
Description
02530.00Scope - This Section includes the requirements for structural steel used in the fabrication
of Bridges and non-Bridge Structures.
Materials
02530.10Structural Steel for Bridges - Structural steel for Bridges shall conform to the following,
as shown or specified:
• AASHTO M 270, Grade 36 ( ASTM A709, Grade 36) • AASHTO M 270, Grade 50 ( ASTM A709, Grade 50) • AASHTO M 270, Grade 50W ( ASTM A709, Grade 50W) • AASHTO M 270, Grade HPS 70 ( ASTM A709 Grade HPS 70) • AASHTO M 270, Grade HPS 70W ( ASTM A709 Grade HPS 70W)
Impact test requirements, for both non-fracture- critical tension components (T), and fracture-critical tension components (F), are to be according t o Zone 2 requirements of AASHTO M 270 Tables 11 and 12, respectively.
02530.20Structural Steel for Non -Bridge Structu res - Structural steel for metal sign Structures
and other non-Bridge Structures shall conform to the following, or as shown or specified:
• AASHTO M 270, Grade 36 ( ASTM A709, Grade 36) • ASTM A36 • AASHTO M 270, Grade 50 ( ASTM A709, Grade 50) • ASTM A572 Notch toughness of all structural steel members and plates greater than 1/2 inch thick in load carrying members of sign Bridges and cantilever sign supports shall conform to Zone 2 requirements of AASHTO M 270.
02530.40Ultrasonic Inspection of Plate - Ultrasonically inspect flanges 2 inches and thicker for
welded plate girders before fabrication according to ASTM A578 except as follows:
• Section 7, Acceptance Standard - Level A, and Section 8, Acceptance Standard - Level B, do not apply. Use Supplem entary Requirement S2.1 for acceptance standard. • Inspection of flanges of rolled shapes with flanges thicker than 1 3/4 inches.
02530.50Universal Mill Plate - Universal mill plate shall not be used
02530.60Rolled Shapes - With the approval of the Engineer, rolled shapes having equal or greater
section properties and meeting minimum flange and web thickness requirements may be substituted for members specified on the Plans , at no additional cost to the Agency.
02530.70Galvanizing - Galvanizing shall be by the hot -dip process according to the following, as
applicable:
• AASHTO M 111 ( ASTM A123) • AASHTO M 232 ( ASTM A153) 02530.71 1118 Steel that wil l be finished by hot -dip galvanizing for use as sign b ridges, illumination poles, traffic signal poles, sign supports, bridge rail and items designated on the Plans as "Galvanize - Control Silicon" shall ha ve controlled silicon content. The silicon content shall be in either of the ranges 0 - 0.06 percent or 0.13 percent - 0.25 percent. Before galvanizing, submit mill test certificates verifying silicon content to the Engineer and the galvanizer.
02530.71Repair of Hot -Dip Galvanizing - Repair damaged hot -dip galvanizing according to
ASTM A780 and ASTM A123. Furnish galvanizing repair Material from the QPL. Minimum dry film thickness is 3 mils. Minimum zinc content for Method A2 is 92 percent on the dry film.
02530.80Acceptance - Acceptance of structural steel will be according to 00165.35 and
this Section.