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This is the final highway accident report (NTSB-HAR-71-1) from the National Transportation Safety Board, adopted in December 1970. It covers the collapse of the U.S. 35 bridge between Point Pleasant, West Virginia, and Kanauga, Ohio, on December 15, 1967, which killed 46 people. The Board found that the cause was a cleavage fracture in eyebar 330 at joint C13N. That fracture grew from a flaw produced over 40 years by stress corrosion and corrosion fatigue, in a spot that could not be seen or found by inspection.
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FIGURE NUMBER LEGEND 26 Fatigue Properties of Eyebar Steel Based on Federal Highway Administration Tests 71 27 Details of Fatigue Specimen Employed in Federal Highway Administration Tests 72 28 General View of Model Test of Eyebar Chain Joint 74 29a Model Eyebar Test A at Instant of Brittle Fracture in Lower Limb Model Eyebar No. 330 75 29b Model Eyebar Test A at Instant of Final Separation of Model Eyebar No. 330 75 30a Outboard Fragment of Eyebar No. 330, Test A Model 76 30b Outboard Fragment of Eyebar No. 330, Prototype 76 31a Results of Rotating Beam Fatigue Specimens Tested by W. L. Starkey 80 31b Results of Fretting Fatigue Specimens Tested by W. L. Starkey 81 32 Comparison of Charpy Impact Data for A7-24 Type Steel from Chain Bent Posts Obtained by Participating Laboratories 86 33 Relationship of Crack Propagation of Secondary Crack in Eyebar No. 330 to Grain Boundaries 97 34 Influence Lines for U5-U7, C11-C13 99 35 Fractures and Other Structural Damage on Towers 102 36 Summary of Experience of Survivors as Related to Sequence of Collapse 112
Document, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 202 pages are in the text index: search them above, or from the library's search.