|
|-----------------------------------------------------------|
| MANNER OF FIRST FAILURE OF LARGE BEAMS |
| (Forest Service Bul. 108, p. 56) |
|-----------------------------------------------------------|
| | Total | Per cent of total failing by |
| COMMON NAME | number |---------+-------------+-------|
| OF SPECIES | of | Tension | Compression | Shear |
| | tests | | | |
|------------------+--------+---------+-------------+-------|
| Longleaf pine: | | | | |
| green | 17 | 18 | 24 | 58 |
| dry | 9 | 22 | 22 | 56 |
| Douglas fir: | | | | |
| green | 191 | 27 | 72 | 1 |
| dry | 91 | 19 | 76 | 5 |
| Shortleaf pine: | | | | |
| green | 48 | 27 | 56 | 17 |
| dry | 13 | 54 | | 46 |
| Western larch: | | | | |
| green | 62 | 23 | 71 | 6 |
| dry | 52 | 54 | 19 | 27 |
| Loblolly pine: | | | | |
| green | 111 | 40 | 53 | 7 |
| dry | 25 | 60 | 12 | 28 |
| Tamarack: | | | | |
| green | 30 | 37 | 53 | 10 |
| dry | 9 | 45 | 22 | 33 |
| Western hemlock: | | | | |
| green | 39 | 21 | 74 | 5 |
| dry | 44 | 11 | 66 | 23 |
| Redwood: | | | | |
| green | 28 | 43 | 50 | 7 |
| dry | 12 | 83 | 17 | |
| Norway pine: | | | | |
| green | 49 | 18 | 76 | 6 |
| dry | 10 | 30 | 60 | 10 |
|-----------------------------------------------------------|
| NOTE.--These tests were made on timbers ranging in cross |
| section from 4" x 10" to 8" x 16", and with a span of 15 |
| feet.