970 Page 545970 STEEL STRUCTURES MATERIAL
970.1GENERAL
These specifications apply to bolted and welded construction.
970.2STRUCTURAL STEEL
Structural steel will be furnished according to the following specifications. Unless otherwise specified, all structural steel furnished will conform to AASHTO M 270 (ASTM A709). When ASTM A709 structural steel with a “T” or an “F” and a temperature zone is specified, the structural steel will be Charpy impact tested to the specified zone. Sampling and testing procedures will be in accordance with ASTM A673 utilizing (H) frequency testing for Grade 36, 50 and 50W steels and utilizing (P) frequency testing for Grade 100 and 100W steels. For Grade 50 and 50W steels, if the yield point of the material exceeds 65 ksi, the temperature for the CVN value for acceptability will be reduced by 15°F for each increment of 10 ksi above 65 ksi. A.High-Strength Bolts : High-strength bolts will conform to Section 972. B.Welded Stud Shear Connectors : Shear connector studs will conform to the requirements of Section 7.3, Type B of the latest edition of the ANSI/AASHTO/AWS D1.5 Bridge Welding Code and the following. Finished studs will be of uniform quality and condition, free from injurious laps, fins, seams, cracks, twists, bends, or other injurious defects. Finish will be as produced by cold drawing, cold rolling or machining. The manufacturer will certify that the studs as delivered are in accordance with the material requirements of this section. Certified copies of in-plant quality control test reports will be furnished upon request. The Engineer may select, at the Contractor's expense, studs of each type and size used under the contract, as necessary for checking the requirements of this section. C.Tubular Steel Piles: Tubular steel piles will conform to ASTM A252, Grade 2, with chemical requirements meeting ASTM A53, Grade B.
970.3STEEL FORGINGS AND STEEL SHAFTING
A.Steel Forgings : Steel forgings will conform to, AASHTO M 102 (ASTM A668), Classes C, D, F, or G. B.Cold Finished Carbon Steel Shafting : Cold finished carbon steel shafting will conform to, AASHTO M 169 (ASTM A108). Grade 1016-1030, inclusive, will be furnished. 970 Page 546970.4 GALVANIZING When specified, ferrous metal products will be galvanized in accordance with, AASHTO M 111 (ASTM A123). Galvanizing repair will be in accordance with ASTM A780.
970.5PREFORMED FABRIC PADS
Preformed fabric pads will be composed of multiple layers of 8 ounce cotton duck impregnated and bound with high-quality natural rubber or of equivalent and equally suitable materials compressed into resilient pads of uniform thickness. The number of plies will be such as to produce the specified thickness, after compression and vulcanizing. The finished pads will withstand compression loads perpendicular to the plane of the laminations of not less than 10,000 pounds per square inch without reduction in thickness or extrusion.
970.6BRONZE OR COPPER-ALLOY BEARING AND EXPANSION PLATES
The sliding surfaces of these plates will be finished in the direction of the motion to ANSI B46.1 #125. This surface will be bored on a geometric pattern of recesses and be lubricated with a material suitable for long-life service of the sliding face. The lubricated area will comprise approximately 25% of the bearing face to provide coefficient of friction not to exceed 10% for loads of 600 to 1,000 psi. The edges of the plate will be chamfered 1/8 inch. A.Bronze Bearing and Expansion Plates : Bronze bearing and expansion plates will conform to, AASHTO M 107 (ASTM B22) Alloy 911. B.Rolled Copper-Alloy Bearings and Expansion Plates : Rolled copper-alloy bearing and expansion plates will conform to, AASHTO M 108 (ASTM B100), Alloy #510 or #511. 972 Page 547972 BOLTS
972.1REQUIREMENTS
These specifications will apply to all high strength bolts, anchor bolts, and anchor rods.
972.2SPECIFIC REQUIREMENTS
A.General: All bolts, anchor bolts, anchor rods, nuts, and washers will have the manufacturer marking on them. The supplier will provide the symbol and address of each bolt, anchor bolt, anchor rod, nut, and washer manufacturer. The supplier and contractor will maintain the identification and integrity of fasteners supplied under either the “Production Lot” or “Shipping Lot” method. All certificates, test reports, and shipping containers will be identified with the appropriate lot identification number. The Contractor will either pre-assemble bolts, anchor bolts, anchor rods, nuts, and washers according to the certified rotational capacity tests or indicate how he plans to maintain the integrity of the lots through installation. The supplier’s certification will provide a lot number, which will match the shipping package. The certification will provide all test results and will indicate when and where all testing was done, including the rotational capacity tests and the zinc coating thickness. Nuts for mechanically galvanized fasteners will be overtapped to the minimum amount required for fastener assembly. All bolts, nuts, washers, and direct tension indicators will be mechanically galvanized in accordance with ASTM B695 Class 55. When direct tension indicators are used adjacent to weathering steel, the direct tension indicators will be mechanically galvanized in accordance with ASTM B695 Class 55 and epoxy coated in accordance with ASTM F959. Mechanically galvanized nuts will be lubricated with a lubricant containing a visible dye. The Contractor will provide all mechanical and chemical test data as specified in ASTM A563 and ASTM A194. B.High Strength Bolts: Bolts will conform to ASTM F3125 Grade A325. The high-strength bolts will be Type 1 for painted steel structures and Type 3 for weathering steel bridges. Nuts will conform to ASTM A563 DH or ASTM A194 2H. Washers will conform to ASTM F436. Direct tension indicators will conform to ASTM F959 for the grade of the bolt specified.