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TABLE 1
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| Comparison of load-bearing capacities* of selected native American woods.
|
| Common names of tree
species strength
|
Maximum crushing
(PSI/lb)
|
Maximum
shearing
strength
(PSI/lb)
|
Modulus of
elasticity**
|
| Hardwoods
|
|
|
|
| Ash, black
|
5970
|
1570
|
1.60
|
| Ash, white
|
7410
|
1910
|
1.74
|
| Beech
|
7300
|
2010
|
1.72
|
| Birch, yellow
|
8170
|
1880
|
2.01
|
| Cherry, black
|
7110
|
1130
|
1.49
|
| Elm, American
|
5520
|
1510
|
1.34
|
| Elm, rock
|
7050
|
1920
|
1.54
|
| Hickory, pignut
|
9190
|
1980
|
2.26
|
| Hickory, shagbark
|
9210
|
2430
|
2.16
|
| Locust, black
|
10180
|
2480
|
2.05
|
| Maple, red
|
6540
|
1850
|
1.64
|
| Maple, sugar
|
7830
|
2330
|
1.83
|
| Oak, southern red
|
6090
|
1390
|
1.49
|
| Oak, white
|
7440
|
2000
|
1.78
|
| Walnut, black
|
7580
|
1370
|
1.68
|
| Softwoods
|
| Cedar, Port Orford
|
6250
|
1370
|
1.70
|
| Fir, Douglas***
|
6230
|
1510
|
1.49
|
| Hemlock, mountain
|
6440
|
1540
|
1.33
|
| Pine, loblolly
|
7130
|
1390
|
1.79
|
| Pine, longleaf
|
8470
|
1510
|
1.98
|
| Pine, slash
|
8140
|
1680
|
1.98
|
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|
*data from ``Wood Handbook'', published in 1987 by the Forest Products Laboratory,
U.S. Dept. Agriculture, Washington, DC 20402.
**Modulus of elasticity is defined as the ratio between the load applied per unit area and
the deformation caused by that load.
***values are for trees harvested from Utah, Colorado, Arizona, and New Mexico; fir
trees grown in coastal areas have far less load-bearing capacity.
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