TIE GIRDER FRACTURE IN SIOUXLAND VETERANS MEMORIAL BRIDGE
The Siouxland Veterans Memorial Bridge, from Sioux City, Nebraska, to Sioux City, Iowa, was opened to traffic in January 1981. In May 1982 Iowa Department of Transportation personnel discovered a fracture across the full width of the top flange on the down stream tie girder. The investigation into the cause of the fracture included chemical and physical testing and fractographic and metallographic examinations. Results of the latter examinations showed that the fracture originated at a gas-flame-cut edge of the 2 3/4-in.-thick A588 flange plate. It arrested at least once at a depth of 0.37 in. and possibly earlier at a depth of about 0.05 in. before propagating in a brittle mode across the flange. The fracture surface was heavily corroded, indicating that the fracture had occurred long before its discovery. The physical tests indicated that the plate in which the fracture occurred did not meet the specified toughness requirements. Additional tests on samples of material extracted from other parts of the girders revealed highly variable toughness properties, some of which did not meet the requirements of the specifications either.
This paper appears in Transportation Research Record No. 1180, Bridge Design and Testing.
Transportation Research Board
500 Fifth Street, NW
Hanson, J M
Koob, M J
Blake, G T
Transportation Research Record
Old TRIS Terms:
Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls
TRIS, TRB, ATRI
Jul 31 1989 12:00AM
More Articles from this Serial Issue: