A Theoretical And Practical Treatise On the Strength of Beams And Columns ..
A Theoretical And Practical Treatise On the Strength of Beams And Columns ..
Cousins, Robert H
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P. * Barlow's "Strength of Materials, " p. 58. TIMBER BEAMS. Ill W. Barlow's experiments ;* the values for C and T are the mean that are usually quoted by authors. EXAMPLE 40. Required the centre breaking load of a Rect- angular French Oak Beam, when The depth d= 7. 5 inches, C = 6000 pounds, "breadth I = 7. 5 " ^=10000 u " span, s = 15. 0 feet, q = 0. 6 and m = 4. The position of the neutral line from the Table becomes dt = 0. 8495 X 7. 5 == 6. 374 inches, and the required load, Z, from Eq. 27..., becomes L = . = 13M3 ndg 3X12X15 M. Buffon, in experiments made for the French Govern- ment^ broke two of these beams with 13828 and 14634 pounds respectively ; from Rondelet's experiments the values of 67 and T 7 are supposed to be equal to those given in the Table for American Red Oak. CIRCULAR WOODEN BEAMS. 1O5. Neutral Line. The position of the neutral line and the value of the factors f c andy T for use in Eqs. 76 and 77 may be obtained from the following Table, by proportion when necessary : * Barlow's " Strength of Materials, " p.
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