Page 118 - Civil Engineering Formulas

(Beams supported at both ends; allowable fiber stress for steel, 16,000 lb/in 2 (1.127 kgf/cm 2 ) (basis of table) for iron, reduce values given in table
Load distributed wL 3 52AD 2 wL 3 ad 2 ) 52(AD 2 wL 3 38AD 2 wL 3 ad 2 ) 38(AD 2 wL 3 52AD 2 wL 3 85AD 2 wL 3 80AD 2 wL 3 93AD 2 (cm 2 ); interior area, in 2

Deflection, in † ad 2 ) ad 2 )

Load in middle wL 3 32AD 2 wL 3 32(AD 2 wL 3 24AD 2 wL 3 24(AD 2 wL 3 32AD 2 wL 3 53AD 2 wL 3 50AD 2 wL 3 58AD 2 depth of beam, in (cm); a
Approximate Safe Loads in Pounds (kgf) on Steel Beams* (Percoyd Iron Works)

D (cm 2 );
Load distributed 1,780AD L ad) 1,780(AD L 1,333AD L ad) 1,333(AD L 1.770AD L 3,050AD L 2,760AD L 3,390AD L

Greatest safe load, lb † Load in middle 890AD L ad) 890(AD L 667AD L ad) 667(AD L 885AD L 1,525AD L 1,380AD L 1,795AD L sectional area of beam, in 2 A total working load, net tons (kgf). † See Table 2.3 for coefficients for correcting values

TABLE 2.2 by one-eighth) Shape of section Solid rectangle Hollow rectangle Solid cylinder Hollow cylinder Even-legged angle or tee Channel or Z-bar Deck beam I-beam distance between supports, ft (m); *L interior depth, in (cm); w d

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