Page 107 - Handbook of Civil Engineering Calculations, Second Edition

1.90 STRUCTURAL STEEL ENGINEERING AND DESIGN

FIGURE 1

3. Calculate the radius of gyration
Calculate the radius of gyration with respect to the y axis of a T section comprising the
compression flange and one-sixth the web, neglecting the area of the fillets. Referring to
2
Fig. 2, we see A f 8.215(0.522) 4.29 sq.in. (27.679 cm ); (1/6)A w (1/6)(19.76)(0.375)
2
4
4
1.24; A T 5.53 sq.in. (35.680 cm ); I T 0.5I y of the section 22.0 in (915.70 cm );
r (22.0/5.53) 0.5 1.99 in. (50.546 mm).