Question

Find the Flange Slenderness using this formula: λ_e= b/t √(f_y/ 250)

and the values to be compared with AS 4100 Table 6.2.4 below (Given) to check its safe point.

450BT65 d 450 mm br - 235 mm tf - 20 mm tw,- 15 mm rı-14 mm Ag 11200 mm2 Te 92.6 mm ry 49.7 mm The figure given below shows a concentrically loaded 450BT65 compression member. Assumptions and Given Values * Grade 300 Steel 280 MPa tok- 300 MPa Consider the effective length for buckling about each axis as 2.2 m . TABLE 6.2.4 VALUES OF PLATE ELEMENT YIELD SLENDERNESS LIMIT Longitudinal edgeResidual stressesYield slenderness supported Plate (see Notes) element type 16 SR 16 HR One 15 LW, CF (Outstand) 14 Flat 45 SR HR 45 40 Both LW. CF 35 H W 82 82 82 SR HR, CF Circular hollow LW sections 82 H W NOTES 1 SRstress relieved HR-hot-rolled or hot-finished CF-cold-formed LW lightly welded longitudinally Hw heavily welded longitudinally 2 Welded members whose compressive residual stresses are less than 40 MPa may be considered to be lightly welded.

Answer 1

50 BT65 450 mm tus 夺E 20 mm 2. 1200 mm mul a 250 2501 250 marnLea-totin least rp.di sデou atan

he ее 2200-44.3 From Above Valuas An yield sLndaan ass limit. 5,875 qs lass惘 Valu-g 21en in able s2y Tha membes Sap