Section 4152. Structural Steel.
Steel used in structural members shall meet the following requirements unless alloy steel is specified in the contract documents. Alloy steel shall meet requirements specified in the contract documents for each project on which such steel is specified.
Structural steel shall be of the type and quality designated in the contract documents. When not specifically designated, it shall be structural carbon steel meeting requirements of ASTM A 709/A 709M Grade 36 (250). Miscellaneous items not commonly rolled from steel meeting these requirements may be furnished in other grades of steel with approval of the Engineer.
Unless noted otherwise, the steel for all members listed in the following paragraph shall have the minimum Charpy V-notch toughness indicated in Table A. Notch toughness shall be determined by longitudinal Charpy V-notch tests, sampled and tested in accordance with AASHTO T 243/T 243M (ASTM A 673/A 673M).
Charpy V-notch toughness requirements apply to the following members:
Flange and web plates of welded plate girders; rolled section main beams, stringers, and welded cover plates;
Flange and web splice plates;
Rolled or welded floor beams, abutment diaphragms, and cross frames carrying direct live loads, and all parts, except shear connectors, welded to each of these members;
Lateral bracings and connecting gusset plates in horizontally curved bridges.
The contract documents may also designate other members to which toughness requirements apply.
Non-Fracture Critical Impact Test Requirements
|Grade||Thickness (in.)(mm) and Joining Method||Minimum Average Energy,
(Joules) ft.lbf at °F (°C)
|36TA (250TA)||to 4 (100), mechanically fastened or welded||15 at 40 (20 at 4)|
|to 2 (50), mechanically fastened or welded
over 2 to 4 (50.1 to 100), mechanically fastened
over 2 to 4 (50.1 to 100), welded
|15 at 40 (20 at 4)
15 at 40 (20 at 4)
20 at 40 (27 at 4)
|to 2 1/2 (65), mechanically fastened or welded
over 2 1/2 to 4 (65.1 to 100), mechanically fastened
over 2 1/2 to 4 (65.1 to 100), welded
|25 at 0 (34 at -18)
25 at 0 (34 at -18)
35 at 0 (48 at -18)
(A) The CVN-impact testing shall be "H" heat frequency testing in accordance with ASTM A 673/A 673M.
(B) If the yield point of the material exceeds 65 ksi (450 MPa), the testing temperature for the minimum average energy required shall be reduced by 15°F (8°C) for each increment of 10 ksi (70 MPa) above 65 ksi (450 MPa). The yield point is the value given on the certified "Mill Test Report".
(C) The CVN-impact testing shall be "P" plate frequency testing in accordance with ASTM A 673/A 673M.