Collapse of U.S. 35 Highway Bridge, Point Pleasant, West Virginia, December 15, 1967 (HAR-71/01)

- 133 - TABLE 1 *Summary of Fracture Toughness Data* *Point Pleasant Bridge Eyebars Material* Type of Specimen Number Test Temperature, °F. Critical Stress Intensity Factor, $K_{Ic}$, ksi $\sqrt{\text{in.}}$ Range Average Notch bend 2 70 46.50–53.61 50.06 Notch bend 3 0 28.27–35.90 32.39 Surface flaw 3 70 47.90–50.9 50.2 Surface flaw 3 32 43.2 –50.8 46.4 Surface flaw 3 0 33.4 –41.8 38.0