2686 Chapter 22 



Table 22-26 — Average modulus of rupture, modulus of elasticity, and impact energy at 

 failure, of round and sawn posts of three species tested in green condition, at 12-percent 

 moisture content, and when pressure treated with creosote (Doyle and Wilkinson 



1969)'— Continued 



Modulus Modulus 



of of Impact 

 Condition and size rupture^ elasticity^ energy^ 



Thousand 

 Psi Thousand psi inch-pounds 

 OAK (MOSTLY BLACK, NORTHERN RED, AND SCARLET) 



Green 



3-inch round 12,030 1,570 33.5 



4- by 4-inch sawn 7,590 1,490 31.3 



5-inch round 9,300 1 ,360 97.4 



4- by 6-inch sawn 6,000 1,140 49.5 



8-inch round 11 ,560 1 ,900 — 



6- by 8-inch sawn 7,150 1,150 — 



Treated 



3-inch round 8,930 1,140 41.0 



4- by 4-inch sawn 6,320 1 ,080 27.5 



5 -inch round 8,390 1,370 51.3 



4- by 6-inch sawn 5,640 1 ,040 54.8 



8-inch round 8,890 1 ,470 — 



6- by 8-inch sawn 5,930 1 , 160 — 



Dry 



3-inch round 7,190 1,020 37.6 



4- by 4-inch sawn 10,580 1 ,630 40.4 



5-inch round 8,970 1 ,540 73.5 



4- by 6-inch sawn 8,730 1 ,260 52. 1 



8-inch round 9,150 1,680 — 



6- by 8-inch sawn 8,220 1 ,400 — 



VIRGINIA PINE 



Green 



3-inch round 8,030 1 ,340 10.9 



4- by 4-inch sawn 5,100 920 7.4 



5-inch round 7,880 1,280 15.7 



4- by 6-inch sawn 5,250 1,150 35.2 



8-inch round 4,440 1 ,080 96.4 



6- by 8-inch sawn 5,920 1,120 97.2 



Treated 



3-inch round 7,140 1,180 11.0 



4- by 4-inch sawn 6,440 1,150 16.9 



5-inch round 7,750 1 ,430 26.3 



4- by 6-inch sawn 4,780 1,070 18.0 



8-inch round 7,380 1,290 1 13.0 



6- by 8-inch sawn 4,870 1 ,020 60.9 



Dry 



3-inch round 11 ,290 1 ,460 7.3 



4- by 4-inch sawn 7,060 1 ,250 10.7 



5-inch round 12,050 1 ,860 19.6 



4- by 6-inch sawn 6,410 1 ,250 16.5 



8-inch round 9,540 1 ,5 10 79.5 



6- by 8-inch sawn 8,760 1 ,580 47.7 



'Each value is the average for five posts (four in a few cases). Specific gravities of the posts static 

 tested averaged as follows (based on ovendry weight and green volume): hickory 0.69, oak 0.58, and 

 pine 0.48. 



^Center-point loaded in bending with span-depth ratio of 14. 



■'struck with a pendulum hammer 24 inches above ground level. 



