The maximum allowable flexural stress in a 2 x 10 standard structural timber (see Table A-15) is 6 ksi. Determine the maximum allowable bending moment for the timber in each of the two orientations shown in the cross sections below. (a) (b)

Elements Of Electromagnetics
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TABLE A-15 Properties of Standard Structural Timber (U.S. Customary Units)
DIMENSIONS*
Nominal
Size
bxh
(in.)
2×4
6
8
10
12
Dressed
Size
(in.)
1% × 3%
5%
7½
9½
11½%
Weight
W
(lb/ft)
1.64
2.54
3.39
4.29
5.19
Area
A
(in²)
5.89
9.14
12.2
15.4
18.7
PROPERTIES
Second Moment
of Area
I
(in*)
6.45
24.1
57.1
116
206
Section
Modulus
S
(in³)
3.56
8.57
15.3
24.4
35.8
Transcribed Image Text:TABLE A-15 Properties of Standard Structural Timber (U.S. Customary Units) DIMENSIONS* Nominal Size bxh (in.) 2×4 6 8 10 12 Dressed Size (in.) 1% × 3% 5% 7½ 9½ 11½% Weight W (lb/ft) 1.64 2.54 3.39 4.29 5.19 Area A (in²) 5.89 9.14 12.2 15.4 18.7 PROPERTIES Second Moment of Area I (in*) 6.45 24.1 57.1 116 206 Section Modulus S (in³) 3.56 8.57 15.3 24.4 35.8
The maximum allowable flexural stress in a 2 × 10 standard structural timber (see
Table A-15) is 6 ksi. Determine the maximum allowable bending moment for the
timber in each of the two orientations shown in the cross sections below.
(a)
(b)
Transcribed Image Text:The maximum allowable flexural stress in a 2 × 10 standard structural timber (see Table A-15) is 6 ksi. Determine the maximum allowable bending moment for the timber in each of the two orientations shown in the cross sections below. (a) (b)
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