P1: GMV PB262-01
PB262/Seismic.cls
January 2, 2003
8
16:16
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PART I – MATERIALS
[Sect. 6.
TABLE I-6-1 Ry Values for Different Member Types Application Hot-rolled structural shapes and bars ASTM A36/A36M ASTM A572/A572M Grade 42 (290) ASTM A992/A992M All other grades Hollow Structural Sections ASTM A500, A501, A618 and A847 Steel Pipe ASTM A53/A53M Plates All other products
Ry 1.5 1.3 1.1 1.1 1.3 1.4 1.1 1.1
For buildings over one story in height, the steel used in the Seismic Load Resisting Systems described in Sections 9, 10, 11, 12, 13, 14 and 15 shall meet one of the following ASTM Specifications: A36/A36M, A53/A53M, A500 (Grade B or C), A501, A529/A529M, A572/A572M (Grade 42 (290), 50 (345) or 55 (380)), A588/A588M, A913/A913M (Grade 50 (345) or 65 (450)), or A992/A992M. The steel used for Column Base plates shall meet one of the preceding ASTM specifications or ASTM A283/A283M Grade D. The specified minimum yield strength of steel to be used for members in which inelastic behavior is expected shall not exceed 50 ksi (345 MPa) unless the suitability of the material is determined by testing or other rational criteria. This limitation does not apply to columns for which the only expected inelastic behavior is yielding at the Column Base. No thermal treatment of weldment or test specimens is permitted, except that machined tensile test specimens may be aged at 200˚F (93˚C) to 220˚F (104˚C) for up to 48 hours, then cooled to room temperature before testing. 6.2.
Material Properties for Determination of Required Strength When required in these Provisions, the Required Strength of a connection or member shall be determined from the Expected Yield Strength R y Fy , of the connected member, where Fy is the specified minimum yield strength of the grade of steel to be used. For rolled shapes and bars, R y shall be as given in Table I-6-1. Other values of R y are permitted to be used if the value of the Expected Yield Strength is determined by testing that is conducted in accordance with the requirements for the specified grade of steel. When both the Required Strength and the Design Strength calculations are made for the same member or connecting element, it is permitted to apply R y to Fy in the determination of the Design Strength.
6.3.
Notch-toughness Requirements When used as members in the Seismic Load Resisting System, ASTM A6/A6M Groups 3, 4, and 5 shapes with flanges 11/2 in. (38 mm) thick and thicker, and plates that are 2-in. (50 mm) thick or thicker shall have a minimum Charpy V-Notch Seismic Provisions for Structural Steel Buildings, May 21, 2002 American Institute of Steel Construction