The theory and practice of modern framed structures : designed for the use of schools, and for engineers in professional practice (1897)
Johnson, J. B. (John Butler), 1850-1902, Bryan, C. W. (Charles Walter), 1863-1927, Turneaure, Frederick Eugene, 1886- · New York : J. Wiley & Sons · leaf 269
and For stress of opposite kinds m =4 1 min. stressX 2 max. stress/ (6) 110000 Since/, is approximately one half the ultimate strength for wrought-iron and mild steel, and is a common factor in the right-hand membersof these equations, the factor of safety may be in-troduced in />,, as, for… … Fig. 272. 226. The Usual Methods of Proportioning Individual Truss Members Subjectedto Varying Direct Stresses.—It is only within recent years that the fatigue of the metaldue to varying stress has been taken into consideration in proportioning individual trussmembers in which the stress is always…
