Symbols - GAMCO INC

1 November 2008 General Notes - 6 Symbols A Cross sectional area, square inches or square millimeters E Modulus of Elasticity, 29,000 kips per square inch or 200 000 Newtons per square millimeter (N/mm2) I Moment of inertia (X & Y axis), inches4 or millimeters4 R Radius of fillet, inches or millimeters S Elastic section modulus (X & Y axis), inches3 or millimeters3 a Distance from web face to edge of flange, inches or millimeters bf Flange width, inches or millimeters d Depth of flange, inches or millimeters k Distance from outside of flange face to intersection of fillet with webs, inches or millimeters k1 Distance from center line of web to intersection of fillet with flange, inches or millimeters r Radius of gyration (X & Y axis), inches or millimeters tf (W and HP shapes)

2 Flange thickness, inches or millimeters (C, MC, S, & L shapes) Average flange thickness, inches or millimeters tw Web thickness, inches or millimeters November 2008 General Notes - 7 Symbol & Dimension Notes Decimal dimensions for bf, d, tf, and tw are in accordance with those listed in ASTM A6/A6M. The method used to determine the approximate dimensions T, k, and k1, is in accordance with the American Institute of Steel Construction (AISC). The fillet radius used in calculating T, k and k1 is the theoretical radius used by Nucor-Yamato Steel and may vary from those of other producers.

3 The method of rounding each value is as follows: a (W, HP, & S shapes) Projection of the flange beyond the face of the web, which equals one-half flange width minus one-half web thickness, rounded to the nearest inch or millimeter (C & MC shapes) Projection of the flange beyond the face of the web, which equals the flange width minus the web thickness, rounded to the nearest inch or millimeter bf Flange width, rounded to the nearest inch or 1 millimeter d Depth of section, rounded to the nearest inch or 1 millimeter tf, tw Flange and web thicknesses, rounded to the nearest inch or millimeter T (W & HP shapes)

4 Clear distance on web between fillets which equals (depth minus the ASTM A6/A6M maximum allowable under-tolerance) minus two times (flange thickness plus fillet radius), rounded to the nearest inch or millimeter (C, MC, S, & L shapes) Clear distance on web between fillets which equals (depth minus ASTM A6/A6M maximum allowable under-tolerance) minus two times [flange thickness at heel plus fillet radius times the tangent of one-half times (90 minus the flange slope, )], rounded to the nearest inch or millimeter k Distance from the outside of the flange to the toe of the fillet on the web which equals one-half (depth minus T distance), rounded to the nearest inch or millimeter k1 (W & HP shapes only) Distance from the center of the web to the toe of the fillet on the flange which equals (one-half web thickness plus the fillet radius)

5 , rounded to the nearest inch or millimeters WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch344 x 16W44 x x x W44 x Steel Prime Section GroupElastic PropertiesFlangeDistanceSection Size Plastic ModulusWebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch340 x 16W40 x 431 x 397 x 372 W40 x 362 x x x

6 X x x x 12W40 x x x x x W40 x x x ModulusPrime Section GroupElastic PropertiesFlangeDistanceSection Size Nucor-Yamato Steel WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch336 x 16-1/2W36 x x x x x x x x x x 12W36 x x x x x x x x x Steel Plastic ModulusPrime Section GroupElastic PropertiesFlangeSection Size DistanceWebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch333 x 15-3/4 W33 x 387 x x x x W33 x x x x 11-1/2 W33 x x x x x Steel DistancePlastic ModulusPrime Section GroupElastic PropertiesFlangeSection Size WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch330 x 15W30 x 391 x 357 x x x W30 x x x x x 10-1/2 W30 x x x x x x x Steel Section

7 Size Plastic ModulusPrime Section GroupElastic PropertiesFlangeWebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch327 x 14W27 x 368 x x x x x x x x x x x 10W27 x x x x x Steel DistancePlastic ModulusPrime Section GroupElastic PropertiesFlangeSection Size WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch324 x 12-3/4 W24 x 370 x x x x x x x x x x x x x x 9W24 x x x x x x x x 7W24 x x Steel Section Size Plastic ModulusPrime Section GroupElastic PropertiesFlangeWebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch321 x 13W21 x x x 12-1/2W21 x x x x x x x x 12-1/4 W21 x x x 8-1/4W21 x x x x 68

8 X x x x 6-1/2W21 x x x Steel DistancePlastic ModulusPrime Section GroupElastic PropertiesFlangeSection Size WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch318 x 11W18 x x x x x x x x x x x x x x x x 7-1/2W18 x x x x x x x x 6W18 x x x Steel Section Size Plastic ModulusPrime Section GroupElastic PropertiesFlangeWebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch316 x 10-1/4 W16 x x x x x 7W16 x x x x x x 5-1/2W16 x x Steel DistancePlastic ModulusPrime Section GroupElastic PropertiesFlangeSection Size WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3

9 InchInch3 Inch314x16W14 x 730 x 665 x 605 x 550 x 500 x 455 x 426 x 398 x 370 x 342 x x x x x x x x x 14 x 14-1/2 W14 x x x x x x 10W14 x x x x x 8W14 x x x x 6-3/4W14 x x x x 5W14 x x Steel Section Size Plastic ModulusPrime Section GroupElastic PropertiesFlangeWebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch312 x 12W12 x x x x x x x x x x x x x x x x x x 10W12 x x x 8W12 x x x x 6-1/2W12 x x x x 4W12 x x x Steel DistancePlastic ModulusPrime

10 Section GroupElastic PropertiesFlangeSection Size WebAreaDepth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1 RIxSxrxIy SyryZxZyInch x lbs/ftInch2 InchInchInchInchInInInInchInch4 Inch3 InchInch4 Inch3 InchInch3 Inch310 x 10W10 x x x x x x x x x 8W10 x x x x 5-3/4W10 x x x Steel Section Size Plastic ModulusPrime Section GroupElastic PropertiesFlangeWebArea Depth Thick-Width Thick-Filletnessness Radius X - X Y - YAdtwbftfTkk1