| Title | Influence of Material Toughness on Fracture Reliability in Steel Bridge |
|---|---|
| Record ID | 68843 |
| Personal Name Creator |
Artmont, Frank A.; Murphy, Thomas; Sause, Richard; Bocchini, Paolo; Mertz, Dennis |
| Personal Name Contributor |
Kozy, Brian M. |
| Corporate Creator | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure |
| Corporate Contributor |
Modjeski and Masters; Lehigh University. ATLSS Engineering Research Center |
| Publisher | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure |
| Publication Date | 20181001 |
| Language | English |
| Abstract | The AASHTO LRFD Bridge Design Specifications do not explicitly include a quantifiable fracture limit state. Fracture control in steel bridges is currently based on mitigating potential fracture initiators through proper structural detailing and specifying minimum impact toughness for base material. This fracture control approach has been successful in minimizing the number of fractures in steel bridges designed since its inception; however, the structural reliability against brittle fracture has not been previously established. Accordingly, the objective of this study is to quantify the relationship between material toughness and fracture reliability in steel bridge members, considering the probabilistic distribution of fracture toughness and applied stress for a variety of structural steels and assumed crack sizes. The master curve approach is used to account for the probabilistic distribution of fracture toughness, and reliabilities are determined using Monte Carlo simulation and the Hasofer-Lind approach. The results indicate that the fracture reliability for modern bridge steels is consistent with the reliability of AASHTO strength limit states, and that certain steels currently available on the market can provide enough reliability against fracture to essentially eliminate brittle fracture as a limit state of concern. |
| Public Note | Work funded by Cooperative Agreement “Advancing Steel and Concrete Bridge Technology to Improve Infrastructure Performance” between FHWA and Lehigh University. FHWA Technical Manager: Brian M. Kozy |
| Rosap ID | dot:43555 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/43555 |
| TRT Terms | Steel bridges; Monte Carlo method; Fracture mechanics; Fracture properties; Mechanical fatigue |
| General Subjects | Steel Bridges; Fatigue; Fracture; Reliability; Monte Carlo Simulation |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1715484 |
| Contract Number | DTFH61-11-H-00027 |
| Report Number | FHWA-HIF-18-047 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/68000/68800/68843/FHWA-HIF-18-047.pdf |
| Format | |
| Database | NTL Digital Repository |