Page 141 - Civil Engineering Formulas
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Medium-
Low-
Strength of Round-Ended Columns According to Euler’s Formula*
Cast iron carbon carbon Wrought steel steel iron 89,000 62,600 53,400 107,000 20,000 17,000 15,400 7,100 31,300,000 30,600,000 28,400,000 14,200,000 5 5 5 Pl 2 Pl 2 Pl 2 61,700,000 60,300,000 56,000,000 17,500,000 55.6 59.4 60.6 16.0 17.2 17
14.4
50.0
17.6
12.5
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
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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