-
1
5
hp : : ()
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp
hp 32
hp
hp
hp
hp
hp
-
2
()
1cross section, Transverse section
2Longitudinal section
wood ray 1Radial section 2Tangential section
PithXylemBarkcambium
Annual ringSummer WoodSpring WoodPoreResin duct
Wood raySap Wood
6
hp
-
3
Heart Wood
()
Early WoodLate Wood
X R T
T
R
X
X
T
7
hp
-
4
z
z
()(sap wood)(heart wood)
Heart wood
8
-
5
Sap wood A.
1. 2. 3. 4. 5. 6.
B.
1. 2. 3. 4.
5.
6.
C.
1. 2.
3.
4.
9
-
6
5.
6.
7.
()(pith)
Pith
10
-
7
()(wood ray)
(Primary ray)Secondary ray
()
Resin duct
Epithelial cell
PinusLarixPseudotsugaPicea
Keteleeria
Normal resin ductTraumatic resin
ductHorizontal resin duct
Vertical resin duct
11
-
8
()
1.
2.
12
-
9
()
1.
2.
(1).
13
-
10
(a) (b) (c) (d)
(2). (a) (b) (c) (d) (e)
14
-
11
15
-
12
()
16
-
13
Chamaecyparis obtusa var. formosana
Taiwan yellow cypress, Taiwan hinoki.
Cupressaceae
1,300~2,900m
1 2 1
1
17
-
14
Chamaecyparis formosensis
Taiwan red cypress. Cupressaceae
1,000~2,800m 1,500~2,150m
20m 50~60m
2 2
1
2
18
-
15
Calocedrus formosana
Taiwan incense cedar. Cupressaceae
300~1,900m
3
19
-
16
Cunninghamia lanceolata
China fir. Taxodiaceae
500~1,800m
~ 3~8
4
20
-
17
Taiwania cryptomerioides
Taiwania Taxodiaceae
1,100~2,800m
() 1
5
21
-
18
Cryptomeria japonica
Japanese cedar, Peacock pine. Taxodiaceae
800~2,200m
30
6
22
-
19
Cinnamomum camphora
Camphor tree Lauraceae
1,200m 1,800m
5m
7
23
-
20
Cinnamomun micranthum
Stout camphor tree Lauraceae
450~1,800m 50cm
30m
2~3
8
24
-
21
Zelkova formosana
Taiwan zelkova Ulmaceae
1,000m
1.8m 30m
1~3
1
()
9
25
-
22
Michelia compressa var. formosana
Formosan michelia Magnoliaceae
200~2,200m 1m 30m
2~4
()
10
26
-
23
(Selangan batu) Shorea astylosa, Shorea foxuorthy, Shorea
glauca, Shorea laevis,
Shorea maxwelliana, Shorea seminis Selangan batu Balau,
Bankirai, Balau merah. Dipterocarpaceae
Selangan batu balau 0.881 Selangan batu No1 0.881 Selangan batu
No2Balau balau red balauSelangan batu Balau balau selangan batu
Alan Merakaalan Balau 1.5
15mm 40mm 4 8~10
Selangan batu balau 10~18
Wax
11
27
hp
-
24
28
hp
hp
hp
-
25
CNS450CNS453CNS454CNS455CNS456CNS457CNS460
()
50% 5%
X
%5X 5%
z
29
-
26
()
1.
2. ()
Y=aDb Y D ab
z ab
12% a b a b
(kgf/cm2) 720 1.25 1180 1.25 (kgf/cm2) 1240 1.25 1810 1.25
(103kgf/cm2) 166 1.00 197 1.00
(kgf/cm2) 370 1.00 620 1.00 (kgf/cm2) 470 1.00 860 1.00
(kgf/cm2) 210 2.25 330 2.25
30
-
27
3. ( 0 )
() Hankisons
nn
//
//
cossin
+=
//
n 2.5~3 1.5~2 2
() 643 kgf/cm2() 30 kgf/cm2 30 Handisons (n 1.5) 77 kgf/cm2 12%
509 kgf/cm2 50 kgf/cm2 30 Hankisons (n 3) 265 kgf/cm2 52%
4.
31
-
28
z 0.64 0.54 0.45 0.26 0.69 0.62 0.52 0.33 0.36 0.31 0.25 0.14
0.50 0.50 0.50 0.50 1.00 1.00 1.00 1.00 1.00 1.00 0.90 0.80
5.
5~6% 20% 1%
z 1% (%) 5 4 2
5 6 5.5
1 1.5
3 4 19% 500 kgf/cm225 70%
32
-
29
13% ( )[ ] 680%%6%13%191500 =+ ( kgf /cm2) 36% 13%
19% 36%
6. 180
7. (creep)
() 0.5~0.59 0.50.5~0.64 0.5~0.55
z 10 0.9 Dead Load 1.0 Occupancy Live Load 1.15 Snow Load 1.6
Wind/Earthquake Load Impact 2.0 Impact Load
33
-
30
(FAO)( ITTO) 20 35 50% 50% 0.3% 800~900 99%
34
-
101 8 30 -8 31
-B1830
-8 31
-
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- Auburn University Wood Mechanics
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