Influence of Material Toughness on Fracture Reliability in Steel Bridge

Artmont, Frank A.; Murphy, Thomas; Sause, Richard; Bocchini, Paolo; Mertz, Dennis; United States. Federal Highway Administration. Office of Infrastructure

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Influence of Material Toughness on Fracture Reliability in Steel Bridge

2018-10-01
By Artmont, Frank A. ; Murphy, Thomas ; Sause, Richard ; ...

[PDF-964.92 KB]

English

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Creators:

Artmont, Frank A. ; Murphy, Thomas ; Sause, Richard ; Bocchini, Paolo ; Mertz, Dennis

Artmont, Frank A. ; Murphy, Thomas ; Sause, Richard ; Bocchini, Paolo ; Mertz, Dennis Less -
Corporate Creators:

United States. Federal Highway Administration. Office of Infrastructure
Contributors:

Kozy, Brian M.
Corporate Contributors:

Modjeski and Masters ; Lehigh University. ATLSS Engineering Research Center

Modjeski and Masters ; Lehigh University. ATLSS Engineering Research Center Less -
Subject/TRT Terms:

[+]

Fatigue Fatigue (Mechanics) Fracture Fracture Mechanics Fracture Properties Monte Carlo Method Monte Carlo Simulation Reliability Steel Bridges
Publication/ Report Number:

FHWA-HIF-18-047
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Contracting Officer:

Kozy, Brian M.
Corporate Publisher:

United States. Federal Highway Administration. Office of Infrastructure
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.
Content Notes:

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
Format:

PDF
Funding:

DTFH61-11-H-00027
Collection(s):

Federal Highway Administration
Main Document Checksum:

[+]

urn:sha256:205a2f49673874be2a7b839c8af8f4f1baa2d5a9743362d2056d6a3ac5b9f953
Download URL:

https://rosap.ntl.bts.gov/view/dot/43555/dot_43555_DS1.pdf
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Influence of Material Toughness on Fracture Reliability in Steel Bridge

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