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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.
Specimen2)
Specimen Hardness Near One Surface
Rc Hardness at Center Hardness Near Other Surface
Rc
Rc Rb
1 24,24,23 18.5,19.5,16.5 99,99.5,98.5 23,23,23
3 23,23,23 18,18.5,18.5 98,98.5,98 23,23,23
4 24,24,23.5 18,19.5,18.5 99,99,98.5 22,23,23
5 23,22,22.5 19,19,19.5 99,99.5,99 22.5,22.5,22.5
7 22.5,23,22.5 20.5,20.5,21.5 23.5,23.5,23.5
6 22.5,23,23 22.5,23,24 22.5,23,23
Excimen i 2 3 4 5 6 7 8 9 10 11 12 13 14
Run A 24.5 23.5 22.0 20.5 20.0 19.0 17.5 18.5 20.0 21.0 22.0 23.0 24.5
Run A 24.0 23.5 22.0 21.5 21.0 21.0 20.0 20.0 20.5 21.5 22.0 22.5 23.5 22.5
Hardness .025 .050 .075 .100 .125 .150 .175 .200 .225 .250 .275 .300
2 Furn B DPE $ R_{c}^{3} $ 265 262 283 268 280 280 280 280 25.5 27 27 27 27
Furn C IPZ
Rc (3)
271 289 289 293 286 289 283 283 283
26 28.5 28.5 29 28 28.5 28 28 28
$ \div $auc. B $ \mathrm{DPEH} $ $ \mathrm{R_{c}}^{3} $ 260 265 277 277 274 277 286 303 293 289 280 286 24.5 25 27 27 26.5 27 28 30 29 28.5 27 28
C DPE $ R_{c}^{3} $ 296 271 283 283 277 293 280 289 29 26 28 28 27 29 27 27 28.5
1) See Sketch C of Laboratory Specimen Plan.
2) See Sketch B of Laboratory Specimen Plan.
3) Converted from LPH using Wilson Conversion Chart.
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APPENDIX B
U. S. STEEL LABORATORY DATA Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 202 pages are in the text index: search them above, or from the library's search.