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FATIGUE OF DIAPHRAGM-GIRDER CONNECTIONS.
| 题名： | FATIGUE OF DIAPHRAGM-GIRDER CONNECTIONS. |
| 作者： | Stallings-JM; Cousins-TE; Tedesco-JW |
| 关键词： | GIRDER-BRIDGES; STEEL-BRIDGES; FATIGUE-CRACKS; DIAPHRAGMS-; GIRDERS-; WELDED-CONNECTIONS; REPAIRS-; FIELD-MEASUREMENTS; STRESSES-; STRUCTURAL-ANALYSIS; FINITE-ELEMENT-ANALYSIS; LABORATORY-TESTS; BOLTED-CONNECTORS; FIELD-TESTS; BRIDGE-MAINTENANCE |
| 摘要： | Distortion-induced fatigue cracking has occurred at hundreds of diaphragm-girder connections in multigirder steel bridges in Birmingham, Alabama, in recent years. Repairs have been ineffective in some cases. The goal of the reported research was an improved strategy for repair and maintenance of the bridges so that the potential for future cracking is minimized. The investigation included field measurements of distortion-induced stresses at connections, field measurements of the effects of removing diaphragms from two in-service bridges, structural evaluations and finite-element method analyses of typical bridge designs, and laboratory testing of bolted connections. The results indicate that interior diaphragms can be removed from many existing bridges without significant negative effects. A new bolted diaphragm-girder connection was designed, installed in the field, and tested. Tests confirmed that the new design performed better than the original design. Recommendations for maintaining the Birmingham bridges include removing unneeded diaphragms and repairing old connections with the new design at needed diaphragms. |
| 总页数： | Transportation Research Record. 1997. (1594) pp34-41 (2 Phot., 3 Fig., 4 Tab., 16 Ref.) |
| 报告类型： | 科技报告 |
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