Page 142 - Civil Engineering Formulas

Medium- carbon steel 89,000 20,000 31,300,000 5 Pl 2 61,700,000 55.6 16.0 13.9 19.7 diameter of a circular sec-

Low- carbon steel 62,600 17,000 30,600,000 5 Pl 2 60,300,000 59.4 17.2 14.9 21.1

Strength of Round-Ended Columns According to Euler’s Formula*
Wrought iron 53,400 15,400 28,400,000 5 Pl 2 56,000,000 60.6 17.5 15.2 21.4 smallest dimension of a rectangular section, in; d

Cast iron 107,000 7,100 14,200,000 17,500,000 50.0 14.4 12.5 17.6 mm 4 . (25.4) 4

Pl 2
8
length of column, in; b kPa; in 4 6.894

Material † Ultimate compressive strength, lb/in 2 Allowable compressive stress, lb/in 2 Smallest I allowable at worst section, in 4 l/b bw 1 12 , 1 4 d , l/d Circular ring of small thickness l/d w 1 8 , allowable load, lb; l least rad

TABLE 3.1 (maximum) Modulus of elasticity Factor of safety Limit of ratio, l/r Rectangle r Circle r d r *P tion, in; r

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