STEEL STRUCTURES SECTION 615 267 SECTION 615 — STEEL STRUCTURES
615.1Description .
This work consists of providing, fabricating, and erecting steel structures and structural steel elements of other structures.
615.2Materials .
615.3Construction.
Bridge Fabricator – Advanced Certification (ABR).
AISC Fracture Critical Endorsement.
available upon request at all times.
of the plans requiring the use of structural steel, forgings, wrought iron, or castings in accordance with AASHTO/NSBA Steel Bridges Collaboration G1.3 Shop De tail Drawing Presentation. In addition to the AASHTO/NSBA requirements, include the following:
ii. Bill of material on each sheet. iii. Charpy V -Notch (CVN) requirements for each piece. iv. Fracture -critical requirements for each piece including indicating fracture -critical areas of members.
STEEL STRUCTURES SECTION 615 268 (1) Project identification data including federal and state project numbers.
vi. Camber diagrams showing the camber at each panel point for trusses or arch ribs, at field splices, and fractions of span length (quarter points minimum) for continuous beams and girders or rigid frames.
erecting any portion of the structural steel.
Steel Bridge Erection Guide Specification. Include drawings of all falsework bents, bracing, guys, dead -men, lifting devices, and attachments to bridge members. Sh ow the sequence of erection, location of cranes and barges, crane capacities, location of lifting points on the members, and weights of the members.
permanent damage to the steel members. Prepare calculations showing that the stability of partial and complete girders is maintained throughout all phases and stages of erection until all girders and diaphragms are in place and all bolts are properly installed . Evaluate steel members for erection loads including self -weight, wind loading in accordance with the LRFD Guide Specification for Wind Load on Bridges in Construction, and construction live loading .
of Delaware.
drawings certified by a registered Delaware professional engineer.
approval a shop drawing of additional field splice(s) with prior approval of the Bridge Design Engineer . Include the locations of additional field splices and all revised splice details in shop and erection drawings.
fabrication begins. Notify the engineer which procedures with be used for each joint or joint type. Do not begin fabrication until the engineer approved WPSs.
STEEL STRUCTURES SECTION 615 269 1. Perform all fabrication of bridge members in accordance with AASHTO/NSBA Steel Bridge Collaboration S2.1Steel Bridge Fabrication Guide. Where AASHTO/NSBA refer to AASHTO LRFD Bridge Design Specifications or AASHTO LRFD Bridge Construction Specifications , use the version identified in the plans.
ANSI/AWS D1.3 Structural Welding Code – Sheet Steel when welding sheet steel thinner than 1/8-inch.
fabrication processes and dates when inspections are to occur. Perform no work in the plant before the engineer authorizes fabrication. Pay the Department’s travel costs when changes to the contractor’s fabrication or inspection schedules are not adequately conveyed to the Department.
will maintain identity of the original piece.
toughness requirements (CVN, fracture -critical) as well as any other special physical requirements. In addition, identify structural steel for primary members by mill identification numbers (heat numbers). Use an approved identification system. Use either paint or low - stress stencils to make identification markings on the metal. Mark the material as soon as it enters the shop and carry the markings on all pieces through final fabrication. Transfer the markings before cutting steel for primary members of bridge structures into smaller pieces. Loss of identification marking on any piece, with no other positive identification, or loss of heat number identification o n any primary member piece will render the piece unacceptable for use.
inches long for automatic processes, and in all cases at least as long as the thickness of the material being welded. Use longer weld tabs as required for satisfactory work.
galvanized structures and flange -to-web welds, for which the fillet weld must run the full length of the attachment, unless otherwise shown on the plans.
paint.
before galvanizing.
members unless altered to provide automatic guidance or otherwise approved.