A timber post of Douglas fir is subjected to an axial compressive load of 60,000 lb. The nominal dimensions of the post area are 8 in. by 8 in. and its length is 6 ft. Knowing that the modulus of elasticity for post is 1.7x10°psi. Compute the strain and total deformation.
A timber post of Douglas fir is subjected to an axial compressive load of 60,000 lb. The nominal dimensions of the post area are 8 in. by 8 in. and its length is 6 ft. Knowing that the modulus of elasticity for post is 1.7x10°psi. Compute the strain and total deformation.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A timber post of Douglas fir is subjected to an axial compressive load of 60,000 Ib. The nominal dimensions of the post area are 8 in. by 8 in. and its length is 6 ft. Knowing that the modulus of elasticity for post is 1.7x10°psi. Compute
the strain and total deformation.
TABLE E.1
U.S. Customary units (Continued)
Nominal Size in.
Dressed Size in.
A in.2
Wt. Ib/ft
1, in.4
S, in.
5 × 5}
x 7}
6 x 6
30.3
8.40
76.3
27.7
8
41.3
11.4
193
51.6
93
52.3
14.5
393
82.7
x 11
x 13}
63.3
17.5
697
121
74.3
20.6
1130
167
x 15
x 17.
x 16
85.3
23.6
1710
220
x 18
96.3
26.7
2460
281
x 20
x 19
108
29.8
3400
349
73 x 73
x9}
x 11
x 13)
8 x 8
56.3
15.6
264
70.3
x 10
71.3
19.8
536
113
x 12
86.3
23.9
951
165
101
28.0
1540
228
x 15
x 17)
x 16
116
32.0
2330
300
x 18
131
36.4
3350
383
x 19
x 21
x 20
146
40.6
4630
475
x 22
161
44.8
6210
578
10 x 10
9) x 9)
90.3
25.0
679
143
x 12
x 11
109
30.3
1200
209
x 13
x 15.
x 14
128
35.6
1950
289
x 16
147
40.9
2950
380
x 17
x 19
x 21
x 18
166
46.1
4240
485
x 20
185
51.4
5870
602
x 22
204
56.7
7870
732
x 24
x 23
223
62.0
10,300
874
12 x 12
11 x 11
132
36.7
1460
253
x 13
x 15
x 14
155
43.1
2360
349
x 16
178
49.5
3570
460
x 18
x 17
201
55.9
5140
587
x 19)
x 21
x 23,
x 20
224
62.3
7110
729
x 22
247
68.7
9520
886
270
75.0
12,400
1060
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