Page 515 - Forensic Structural Engineering Handbook

14.6 MATERIAL-SPECIFIC FORENSIC ANALYSES

1.6
1.4
0.25 0.94
0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3
Ungraded MOE VSR MOE
COV = 0.50 E .05 /E = 0.18 COV = 0.25 E .05 /E = 0.59
(a) (b)

1.7 1.8

1.39 1.5

0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3
Glulam MOE
MSR MOE COV = 0.10 E /E = 0.84
COV = 0.11 E .05 /E = 0.82 .05
(c) (d)

2.0

1.8
0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3
All MOE distributions
PSL/LVL MOE
COV = 0.06 E .05 /E = 0.90
(f)
(e)
FIGURE 14.3 Frequency histograms for various structural wood products.

allowable bending stress are used for member identification, and tabular values are listed
1
in Table 4C of the National Design Specification Supplement. MOE may be measured by
plotting the stress-strain curve from bending, tension, or compression load tests or by stress
wave testing.
Modulus of elasticity is the slope of the stress-strain curve in a static load test. A
dynamic MOE may also be determined by the formula
2
MOE = DV /g