Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 / Tests of Creosoted Timber, Paper No. 1168

by W. B. Gregory

TABLE 2.—Bending Strength of Large Sticks.

Loblolly Pine.
Reference number.	Locality of Growth.	Dimensions.		Grade.	Condition of seasoning.		Number of tests.	Moisture, per cent.	Rings per inch.	Specific gravity, dry.	Weight per Cubic Foot, in Pounds.		Fiber stress at elastic limit, in pounds per square inch.	Modulus of rupture, in pounds per square inch.	Modulus of elasticity, in thousands of pounds per square inch.	Elastic resilience, in inch pounds per cubic inch.	Number failing by longi- tudinal shear.	Remarks.
		Section, in inches.	Span, in feet								As tested.	Oven dry.
1	South Carolina.	6 by 7 6 by 10 4 by 12 6 by 16 8 by 14 8 by 16	10 to 15.5	Square edge	Green	Average	42	48.0	5.7	0.50	46.2	31.2	3,150	5,580	1,426	0.45	7	Moisture above saturation point in all cases.
						Maximum		92.1	11.7	0.60	56.8	37.5	5,210	8,460	1,920	0.99
						Minimum		30.2	2.3	0.40	35.6	25.0	1,675	3,120	905	0.07
2	South Carolina.	6 by 7 4 by 12 6 by 10 6 by 16 8 by 16 10 by 16	10 to 16	Square edge	Partially air dry.	Average	18	27.7	5.0	0.50	40.0	31.2	3,380	5,650	1,435	0.45	0	Moisture from 25 to 30 per cent.
						Maximum		29.2	8.2	0.55	43.7	34.4	4,610	8,090	1,880	0.76
						Minimum		25.5	2.5	0.45	35.6	28.1	2,115	3,600	1,152	0.20
3	South Carolina.	6 by 7 4 by 12 6 by 10 6 by 16	10 to 15	Square edge	Partially air dry.	Average	19	21.0	5.6	0.50	37.5	31.2	2,970	5,690	1,340	0.39	2	Moisture less than 25 per cent.
						Maximum		24.9	17.2	0.58	45.6	36.2	4,850	8,100	2,040	0.69
						Minimum		15.0	2.7	0.41	31.2	25.6	1,730	2,910	906	0.10
4	Virginia.	8 by 8	6 to 16	Square edge	Partially air dry.	Average	12	22.4	4.8	0.46	35.6	28.8	3,260	5,180	1,180	0.51	0
						Maximum		27.7	8.8	0.58	43.1	36.2	5,300	8,950	1,728	1.05
						Minimum		17.8	2.5	0.37	30.0	23.1	1,280	2,180	606	0.13
5	Virginia.	8 by 8	6 to 15.5	Square edge	Green	Average	17	64.0	3.0	0.43	43.7	26.9	1,935	3,490	744	0.31	0	Very rapid growth; poor quality.
						Maximum		100.5	4.0	0.51	51.9	31.9	3,185	4,720	1,193	0.78
						Minimum		38.8	2.5	0.35	35.0	21.9	956	2,180	357	0.12
Long-Leaf Pine.
6	South Carolina.	6 by 8 10 by 16	15	Merchantable	Partially air dry	Average		25.0	13.7	0.58	45.6	36.2	3,800	7,160	1,560	0.53	9
						Maximum	22	40.3	25.4	0.76	60.0	47.5	4,970	10,020	2,010	0.78
						Minimum		17.3	6.2	0.50	39.4	31.2	2,220	5,450	1,190	0.21
7	Georgia.	10 by 12	15	Merchantable	Partially air dry.	Average		27.3	18.0	0.69	54.7	42.9	5,581	8,384	1,820		6	Excellent merchantable grade.
						Maximum	22	34.5	29.0	0.79		49.4	9,600	11,410	2,920
						Minimum		20.0	11.0	0.50		31.4	3,547	4,836	1,167

TABLE 3.—Loblolly Pine.— Bending Tests on Beams Seasoned Under Different Conditions.
(8 by 16-in. section; 13-1/2 to 15-ft. span.)

	Number of tests.	Fiber stress at elastic limit, in pounds per square inch.	Modulus of rupture, in pounds per square inch.	Longitudinal shear at maximum load, in pounds per square inch.	Modulus of elasticity, in thousands of pounds per square inch.	Percentage of moisture.	Rings per inch.	Weight per cubic foot, oven dry, in pounds.	Condition of seasoning.
Average	4	3,580	5,480	3644	1,780	23.2	9.4	33.7	Air dry, 3-1/2 months in the open.
Maximum		4,070	6,600	440	1,987	24.3	11.5	34.5
Minimum		3,090	5,000	327	1,530	21.5	8.0	32.5
Average	5	4,512	5,060	3383	1,685	20	7.7	33.9	Kiln dry, 6 days.
Maximum		5,840	7,320	488	1,790	22	10.2	38.0
Minimum		3,180	2,150	143	1,410	18	4.7	27.7
Average	12	4,331	6,721	4939	1,688		7.7		Air dry, 21 months under shelter.
Maximum		4,990	8,560	620	2,002		9.5
Minimum		3,110	5,160	380	1,398		5.5

Note.—Figures written as subscripts to the figures for longitudinal shear indicate the number of sticks failing in that manner.

Plate II.—Side Views of Tested Timbers.