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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.
“The Advance”2 pages
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Laboratory Source of Sample Yield Point ksi. Yield Strength 0.2% Offset Tensile Strength ksi. Elongation, % 1" Reduction Area % ksi. ksi. National Bureau of Standards 3/4 inch Av. gusset U7N (Longitudinal) Min. (Transverse)Av. Min. 31.2 31.5 59.6 37 64 29.8 30.1 59.0 36 63 28.9 30.0 59.4 37 59 29.2 29.5 59.2 36 58 5/8 inch Web, Chain Bent Post (Transverse)Av. Min. 36.5 37.3 68.0 32 55 35.5 36.2 67.4 30 54 35.5 63.2 33.0 33.5 66.5 U. S. Steel 1/2 inch Av. Plate, Chain Bent Post Min. 34.7 63.0 33.0 32.0 65.9 Comparison Values University of Wisconsin, 1927¹. Various Plates and Shapes, A7-24, 1/2 inch to 3/4 inch thick 35.8 64.2 28.0 (8 Inches) 27.6 52.2 13.2 (8 Inches) 1. From M. O. Withey 'Tests of Specimens Cut from Different Portions of Structural Steel Shapes," presented June 1928, annual meeting of the American Society for Testing Materials.
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.