Figure 16. The parallel-to-the-grain post fracture calculated in the post just below the top of the rigid support is in agreement with the location of damage observed in the tests. Diagrams A, B, C, and D.

1. Grade 1 deformed configuration. This figure shows a computer-generated illustration of a post. The post is shown inserted in the metal brace. The post itself is colored red while the metal brace is colored green. Near the top of the post appears a small section colored purple with an eyehook protruding from the structure. The top half of the post leans to the right at a rough twenty-degree angle, forming a gap near the entry point into the brace. The gap itself spreads through nearly three-quarters the width of the post.

2. Fringes of damage. This figure shows a computer-generated illustration of a post. The post is colored white in this illustration, and an eyehook appears from the right hand side of the structure near its top. The top half of the post leans to the right at a rough twenty-degree angle, forming a gap near the entry point into the brace. The gap itself spreads through nearly three-quarters the width of the post. The fringes of damage are colored blue and red and appear on the underside of the gap for a short length and at the point in which the top and bottom halves of the post are still connected.

3. DS-65 deformed configuration. This figure shows a computer-generated illustration of a post. The post is shown inserted in the metal brace. The post itself is colored red while the metal brace is colored green. Near the top of the post appears a small section colored purple with an eyehook protruding from the structure. The top half of the post leans to the right at a rough twenty-degree angle, forming a gap near the entry point into the brace. The gap itself spreads through only a quarter the width of the post.

4. Fringes of damage. This figure shows a computer-generated illustration of a post. The post is colored white in this illustration, and an eyehook appears from the right hand side of the structure near its top. The top half of the post leans to the right at a rough twenty-degree angle, forming a gap near the entry point into the brace. The gap itself spreads through only a quarter the width of the post. The fringes of damage are colored blue and red and appear on the underside of the gap for a short length and on the upper side of the gap nearer the front of the gap.

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FHWA-HRT-05-096