709— Structural Steel

700-99 Section 709 — Structural Steel

709.1 Description 1 Furnish, fabricate, and erect steel structures and structural steel elements for other structures. 709.1.1 Design and Details of Design 1 When performed by the Contractor, ensure that the design methods, calculations, and details of the design of structural steel comply with the AASHTO LRFD Bridge Design Specifications , applicable SCDOT Structures Manuals, and these specifications. For conflict s between SCDOT specifications and the AASHTO specifications, the requirements of the SCDOT specifications govern. 709.1.2 Plans (Design Drawings) 1 The Department will furnish Plans (Design Drawings) showing a complete design with sizes, sections, and the relative locations of the various members. Plans will indicate the camber of structural members, tolerances, finishes, type of fasteners , and other information as may be required for the preparation of Shop Plans and Working Drawings. 709.1.3 Shop Plans and Working Drawings 1 Furnish Shop Plans showing the complete details and sizes of component parts of the structure and details of all miscellaneous parts such as nuts, bolts, drains, etc. S ubmit additional stress sheets, Working Drawings, and Erection Plans as required. Ensure that Shop Plan, Working Drawing, and Erection Plan submissions conform to Subsection 105.2, Section 725, and Subsection 709.3.5.4. 709.2 Materials 709.2.1 Structural Steel 709.2.1.1 General 1 Ensure that all structural steel conforms to AASHTO M 270. 2 Thermo- mechanical control processed (TMCP) HPS 70W steel may be directly substituted for quenched and tempered (Q&T) HPS 70W steel for plate thicknesses up to 2 in. 3 Protect the stock steel to be used in the project such that all surfaces are free from heavy rust and rust pitted areas at the start of and during fabrication.