asphaltum, thinned with creosote oil. The heads of piles when cut shall be promptly coated with the hot asphaltum and oil, even though the cut-off be temporary.
METHOD OF TESTING.
The tests were made on a Riehl�� 100,000-lb. machine in the Experimental Engineering Laboratory of Tulane University of Louisiana. The machine is provided with a cast-iron beam for cross-bending tests. The distance between supports was 12 ft. The method of support was as follows: Each end of the beam was provided with a steel roller which rested on the cast-iron beam of the testing machine, while above the roller, and, directly under the beam tested, there was a steel plate 6 by 8 in. in area and 1 in. thick. The area was sufficiently great to distribute the load and prevent the shearing of the fibers of the wood. The head of the Riehl�� machine is 10 in. wide. A plate, 3/8 in. thick, 6 in. wide and 18 in. long, was placed between the head of the machine and the beam tested.
[Illustration: FIG. 1.--DEFLECTON CURVES BEAM I]
[Illustration: FIG. 2.--DEFLECTON CURVES BEAM II]
TABLE 1.--SUMMARY OF RESULTS OF TRANSVERSE TESTS OF BEAMS AT TULANE UNIVERSITY, FEBRUARY 10TH TO MARCH 2D, 1909.
Columns in table:
1. Number of beam. 2. Top or butt of log. 3. Width, in inches. 4. Height, in inches. 5. I = (bh^3)/12 6. Actual at elastic limit. 7. Maximum. 8. At elastic limit. 9. Maximum. 10. At elastic limit. 11. E = (Pl^3)/(48dI) 12. Weight, in pounds per cubic foot.
===========================================================================+ | | b | h | I | LOADS: |S = (Plc)/(4I) | d, | | | | | | | |INCHES.| | |------+-------+-------+-----------------+---------------+-------+ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ------+---+------+-------+-------+--------+--------+-------+-------+-------+ I | B | 6.28 | 15.94 | 2,120 | 22,000 | 45,900 | 2,975 | 6,200 | 0.41 | I | T | 6.00 | 15.69 | 1,934 | 20,000 | 38,000 | 2,915 | 5,540 | 0.465 | | | | | | | | | | | II[A]| T | 6.37 | 15.81 | 2,098 | 20,000 | 43,450 | 2,722 | 5,918 | 0.380 | II | B | 6.41 | 16.41 | 2,360 | 16,000 | 25,040 | 1,999 | 3,130 | 0.430 | | | | | | | | | | | III | T | 5.88 | 15.68 | 1,871 | 24,000 | 45,130 | 3,608 | 6,785 | 0.535 | III | B | 5.88 | 15.90 | 1,965 | 21,000 | 35,190 | 3,054 | 5,120 | 0.515 | | | | | | | | | | | IV | T | 6.00 | 15.43 | 1,835 | 22,000 | 38,425 | 3,320 | 5,810 | 0.465 | IV | B | 6.12 | 15.87 | 2,032 | 22,000 | 35,500 | 3,090 | 4,983 | 0.660 | | | | | | | | | | | V | B | 6.00 | 16.00 | 2,048 | 22,000 | 47,000 | 3,090 | 6,610 | 0.400 | V[A]| T | 6.00 | 15.87 | 1,999 | 14,000 | 22,050 | 1,998 | 3,145 | 0.315 | | | | | | | | | | | VI[A]| B | 5.50 | 15.75 | 1,790 | 22,000 | 51,330 | 3,484 | 8,925 | 0.450 | VI[A]| T | 5.87 | 15.62 | 1,865 | 20,000 | 44,000 | 3,013 | 6,627 | 0.410 | | | | | | | | | | | VII | B | 6.56 | 15.62 | 2,083 | 34,000 | 51,900 | 4,580 | 6,985 | 0.620 | VII[A]| T | 6.22 | 15.62 | 1,975 | 20,000 | 49,000 | 2,845 | 6,970 | 0.380 | ===========================================================================+
[Footnote A: Failed in longitudinal shear.]
============================================== E | | | | -----------+ | 11 | 12 | Remarks. -----------+------+--------------------------- 1,575,000 | 50.2 | } Close-grained pine, 1,383,000 | 47.5 | } long-leaf. | | 1,562,000 | 40.5 | } Coarse loblolly, 979,000 | 42.2 | } large knots. | | 1,489,000 | 40.4 | } Close-grained, long-leaf 1,288,000 | 44.2 | } no knots. | | 1,601,000 | 40.8 | } Loblolly, with 1,017,000 | 41.5 | } knots. | | 1,670,000 | 47.2 | } Long-leaf yellow 1,382,000 | 42.1 | } pine. | | 1,695,000 | 50.2 | } Long-leaf yellow 1,625,000 | 45.2 | } pine. | | 1,637,000 | 43.7 | } Long-leaf yellow 1,658,000 | 40.2 | } pine. ==============================================
The deflection was measured on both sides of each beam by using silk threads stretched on each side from nails driven about 2 in. above the bottom of the beam and directly over the rollers which formed the supports. From a small piece of wood, tacked to
![](qr/16487/2.png)
Continue reading on your phone by scaning this QR Code
Tip: The current page has been bookmarked automatically. If you wish to continue reading later, just open the
Dertz Homepage, and click on the 'continue reading' link at the bottom of the page.