Calculate the slenderness limits See Table B4.1 on page 16.116. For the flanges of I-shape sections = 0.56 x = 0.56 x = 15.9 r For the webs of I-shapes section r = 1.49 x = 1.49 x = 42.3 Step II. Calculate the slenderness ratios for the flanges and webs of W14 x 74 For the flanges of I-shape member, b = bf/2 = flange width / 2 Therefore, b/t = bf/2tf. For W 14 x 74, bf/2tf = 6.4 (See Page 1-2 in AISC) For the webs of I shaped member, b = h h is the clear distance between flanges less the fillet / corner radius of each flange For W14 x 74, h/tw = (See Page 1-2 in AISC) Step III. Make the comparisons and comment For the flanges, b/t < Therefore, the flange is non r. For the webs, h/tw < Therefore the web is non r. Therefore, the section is non Therefore, local buckling will not limit the column strength. 4.7 COLUMN DESIGN The AISC manual has tables for column strength. See page 4-1 onwards. For wide flange sections, (cPn) the column buckling strength is tabulated with respect to the in Table 4-1. effective length about the minor axis KyLy
Calculate the slenderness limits See Table B4.1 on page 16.116. For the flanges of I-shape sections r = 0.56 x = 0.56 x = 15.9 For the webs of I-shapes section r = 1.49 x = 1.49 x = 42.3 Step II. Calculate the slenderness ratios for the flanges and webs of W14 x 74 For the flanges of I-shape member, b = bf/2 = flange width / 2 Therefore, b/t = bf/2tf. For W 14 x 74, bf/2tf = 6.4 (See Page 1-2 in AISC) For the webs of I shaped member, b = h h is the clear distance between flanges less the fillet / corner radius of each flange For W14 x 74, h/tw = (See Page 1-2 in AISC) Step III. Make the comparisons and comment For the flanges, b/t < r. Therefore, the flange is non For the webs, h/tw < r. Therefore the web is non Therefore, the section is non Therefore, local buckling will not limit the column strength. 4.7 COLUMN DESIGN The AISC manual has tables for column strength. See page 4-1 onwards. For wide flange sections, the column buckling strength (cPn) is tabulated with respect to the effective length about the minor axis KyLy in Table 4-1.
F13_CE470Ch4CompressionDesign_1.docx