Figure 6. These components of the model with the parallel to the grain timber bending test data demonstrate the need for different quality factors in tension and compression. Graphs.

Graph (a) SEL STR. This graph shows three distinct lines. The first line, solid and black is labeled Clear Wood. The second line, solid black with small dots is labeled SEL STR, Q subscript 1 equals 0.49 Q subscript c equals 0.49 Q subscript stiff equals 1.0. The third line, solid black with large diamonds is labeled SEL STR, Q subscript 1 equals 0.25 Q subscript c equals 0.49 Q subscript stiff equals 0.8. The vertical axis of this graph ranges from zero to twenty and represents Load (Kips) while the horizontal axis of this graph ranges from zero point zero to 2.5 and represents Deflection in inches.
The first line, solid black, begins at the point of zero on both axes where it ascends diagonally across the graph until it leaves the graph at the point of 16 on the vertical axis and 2.5 on the horizontal axis.
The second line, solid black with dots begins at the points of zero on both axes and ascends across the graph in an arch, leaving the graph at the point of 14 on the vertical axis and 2.5 on the horizontal axis.
The third line, solid black with large diamonds begins at the point of zero on both axes where it then ascends to the point of 8 on the vertical axis and 1.5 on the horizontal axis. From this point the line drops straight down and off of the graph. The line then re-enters the graph and oscillates between the points of 5 and zero on the vertical axis until it leaves the leaves the graph at 2 on the vertical axis and 2.5 on the horizontal axis.
Graph (b) Grade 2. This graph shows three distinct lines. The first line, solid and black is labeled Clear Wood. The second line, solid black with small dots is labeled SEL STR, Q subscript 1 equals 0.43 Q subscript c equals 0.43 Q subscript stiff equals 1.0. The third line, solid black with large diamonds is labeled SEL STR, Q subscript 1 equals 0.25 Q subscript c equals 0.43 Q subscript stiff equals 0.8. The vertical axis of this graph ranges from zero to twenty and represents Load (Kips) while the horizontal axis of this graph ranges from zero point zero to 2.5 and represents Deflection in inches.
The first line, solid black, begins at the point of zero on both axes where it ascends diagonally across the graph until it leaves the graph at the point of 16 on the vertical axis and 2.5 on the horizontal axis.
The second line, solid black with dots begins at the points of zero on both axes and ascends across the graph in an arch, leaving the graph at the point of 14 on the vertical axis and 2.5 on the horizontal axis.
The third line, solid black with large diamonds begins at the point of zero on both axes where it then ascends to the point of 8 on the vertical axis and 1.5 on the horizontal axis. From this point the line drops straight down and off of the graph. The line then re-enters the graph and oscillates between the points of 4 and zero on the vertical axis until it leaves the leaves the graph at 4 on the vertical axis and 2.5 on the horizontal axis.

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FHWA-HRT-05-096