LECTURE+22+COE-3001-A

Maximum bending moment s mmax allow max allowable

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Unformatted text preview: 2/22/13 M. Mello/Georgia Tech Aerospace 5 BEAMS OF STANDARDIZED SHAPES AND SIZES ²་  DIMENSIONS AND PROPERTIES LISTED IN ENGINEERING HANDBOOKS, MANUALS AND ALSO FOUND ONLINE.. (SEE APENDICES E, F IN GERE AND GOODNO) •  Cross- secTonal dimensions •  Mass/length •  Cross- secTonal area •  Moment of inerTa r r •  SecTon modulus I1 I2 •  Radius of gyraTon r1 = r2 = A A ²་  IN THE UK: NaTonal Structural Steelwork SpecificaTons (published by BriTsh ConstrucTonal Steelwork AssociaTon) ²་  In the US: Steel ConstrucTon Manual (in USCS and SI units) (published by American InsTtute of Steel ConstrucTon (AISC) ²་  In Europe: Design of steel structures governed by Eurocode 3 2/22/13 M. Mello/Georgia Tech Aerospace 6 BEAMS OF STANDARDIZED SHAPES AND SIZES STRUCTURAL STEEL SECTION DESIGNATIONS ☞  See table E- 1 (WIDE FLANGE BEAMS) ²་ EXAMPLE: HE 600A –  SecTon is a wide- flange shape web –  Nominal depth = 600mm –  Width = 300mm –  Cross- secTonal area = 226.5mm2 –  Mass/length = 178kg/m ☞ table E- 2 : EUROPEAN STANDARD BEAMS (IPN SHAPES) ☞  table E- 3 : EUROPEAN STANDARD CHANNELS (UPN SHAPES) ☞  table E- 4 : EUROPEAN EQUAL ANGLES ☞  table E- 5 : EUROPEAN UNEQUAL ANGLES flange flange web ☞  ALL STANDARDIZED STEEL SECTIONS MANUFACTURED BY A ROLLING PROCESS WHEREBY A BILLET OF HOT STEEL IS ROLLED BACK AND FORTH BETWEEN ROLLS UNITL IT IS FORMED INTO THE DESIRED SHAPE 2/22/13 M. Mello/Georgia Tech Aerospace 7 E- 1 (WIDE FLANGE BEAMS) 2/22/13 M. Mello/Georgia Tech Aerospace 8 E- 2 : EUROPEAN STANDARD BEAMS (IPN SHAPES) 2/22/13 M. Mello/Georgia Tech Aerospace 9 E-3 : EUROPEAN STANDARD CHANNELS (UPN SHAPES) 2/22/13 M. Mello/Georgia Tech Aerospace 10 E-4 : EUROPEAN EQUAL ANGLES 2/22/13 M. Mello/Georgia Tech Aerospace 11 E-5 : EUROPEAN UNEQUAL ANGLES 2/22/13 M. Mello/Georgia Tech Aerospace 12 PROPERTIES OF STRUCTURAL LUMBER 2/22/13 M. Mello/Georgia Tech Aerospace 13 “EFFICIENCY” OF VARIOUS BEAM SHAPES ²་  A LARGER SECTION MODULUS PERMITS A LARGER BENDING MOMENT BEFORE THE ALLOWABLE STRESS IS REACHED. Mmax I S= S= c allow ²་  THE FURTHER THE MATERIAL IS FROM THE NEUTRAL AXIS, THE LARGER THE SECTION MODULUS BECOMES ²་  MOST EFFICIENT BEAM IS THEREFORE ONE FOR WHICH MATERIAL IS LOACATED AS FAR AWAY AS PRACTICALLY POSSIBLE FROM T...
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