Documents / Document
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.
## APPENDIX B ## NATIONAL BUREAU OF STANDARDS TEST RESULTS Table A5. Hardness Test Results Eye C4 Distance from south face Vickers hardness numbers Distance from hole Vickers hardness numbers 0.5mm 0.02in. 210 0.5mm .02in. 251 1.0 .04 221 1.0 .04 251 1.5 .06 229 1.5 .06 249 2.0 .08 232 2.0 .08 246 2.5 .10 234 2.5 .10 254 3.0 .12 234 3.5 .14 244 3.5 .14 239 4.5 .18 249 4.0 .16 241 5.5 .22 254 4.5 .18 246 6.5 .26 246 5.0 .20 239 7.5 .30 249 5.5 .22 254 8.5 .33 246 6.0 .24 251 9.0 .35 251 6.5 .26 251 7.0 .28 254 7.5 .30 244 The above measurements were made 0.4 in. from the south face. 8.0 .31 246 8.5 .33 241 9.0 .35 254 9.5 .37 254 10.0 .39 251
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.