The elasticity and resistance of the materials of engineering (1883)
Burr, William H. (William Hubert), 1851-1934 · New York, J. Wiley & sons · leaf 444
/ 3 K-f J (Radius of gyratioiif = r^ = All the equations of this case (except Eq. (40)), just as theystand, apply directly to the rect-angular cellular section of Fig. 14,considered in reference to the axisFB. If there were n cells insteadof 3, the space between any adja-cent two would have the… … / = {Radius of gyrationf = (41) Ttr^*47rr, Fig. 15. 4 Next consider a hollow circular column whose interior andexterior radii are r^ and r^ respectively. The moment of iner-tia about any diameter is: / = -^-^— -^ = ^ J -; {A = area) . . (42) (Radius of gyratiorif = I 7r(r/ - r,) + r. = r\ 424…
Strength of materials · Building materials
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