CIVIL ENGINEERING FORMULAS

TABLE 2.2 Approximate Safe Loads in Pounds (kgf) on Steel Beams* (Percoyd Iron Works)

(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

by one-eighth)

Greatest safe load, lb† Deflection, in†

Shape of section Load in middle Load distributed Load in middle Load distributed

Solid rectangle

Hollow rectangle

Solid cylinder

Hollow cylinder

Even-legged angle or tee

Channel or Z-bar

Deck beam

I-beam

*Ldistance between supports, ft (m);Asectional area of beam, in^2 (cm^2 );Ddepth of beam, in (cm); ainterior area, in^2 (cm^2 );

dinterior depth, in (cm); wtotal working load, net tons (kgf ).

†See Table 2.3 for coefficients for correcting values for various methods of support and loading.

wL^3

93 AD^2

wL^3

58 AD^2

3,390AD

L

1,795AD

L

wL^3

80 AD^2

wL^3

50 AD^2

2,760AD

L

1,380AD

L

wL^3

85 AD^2

wL^3

53 AD^2

3,050AD

L

1,525AD

L

wL^3

52 AD^2

wL^3

32 AD^2

1.770AD

L

885 AD

L

wL^3

38(AD^2 ad^2 )

wL^3

24(AD^2 ad^2 )

1,333(ADad)

L

667(ADad)

L

wL^3

38 AD^2

wL^3

24 AD^2

1,333AD

L

667 AD

L

wL^3

52(AD^2 ad^2 )

wL^3

32(AD^2 ad^2 )

1,780(ADad)

L

890(ADad)

L

wL^3

52 AD^2

wL^3

32 AD^2

1,780AD

L

890 AD

L

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