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Showing 1 to 9 of 9 for “"Fracture Critical"”.
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Redundancy Evaluation of Fracture Critical Bridges
Cases of brittle fractures in major bridges prompted AASHTO to publish its first fracture control plan in 1978. It focused on material and fabrication standards, and required periodic 24-month hands-on inspection of bridges with fracture critical members. The practical result of this plan was to …
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System Redundancy Evaluation for Steel Truss Bridge
… members in a truss bridge are identified as fracture critical members which implies that a collapse is expected to occur once a member of this type fails. However, there are several examples which show that bridges have remained standing and shown little distress even after a fracture …
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Evaluation of redundancy in trapezoidal box-girder bridges using finite element analysis
The AASHTO Bridge Design specifications define a fracture-critical member as a component in tension whose failure is expected to result in the collapse of a bridge. The tension flanges of twin box-girder bridges are thus labeled as fracture-critical. In order to avoid the catastrophic collapse …
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Fracture Behavior Characterization of Conventional and High Performance Steel for Bridge Applications
The work described herein examines the fracture behavior of steels used in bridge applications. As part of Transportation Pooled Fund (TPF) Project 5-238, Design and Fabrication Standards to Eliminate Fracture Critical Concerns in Steel Members Traditionally Classified as Fracture Critical, …
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Development of internally redundant steel box straddle caps
… steel box straddle caps are classified as Fracture Critical Members, requiring stringent design, fabrication, and in-service inspections to comply with the provisions of the Fracture Control Plan. Providing internal redundancy to steel box straddle caps to remove the Fracture Critical …
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FEA methodology for system-level redundancy evaluation: Application to non-composite steel bridges
… all steel bridges with members designated as Fracture Critical Members (FCMs) are required to undergo hands-on inspections every 24 months. A FCM is a primary steel tension member (or portion of) which failure results in collapse or loss of serviceability of a bridge. However, presently, there …
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STANDARDS TO CONTROL FRACTURE IN STEEL BRIDGES THROUGH THE USE OF HIGH-TOUGHNESS STEEL AND RATIONAL INSPECTION INTERVALS
… early knowledge was limited regarding fatigue, fracture, and overall system behavior; subsequently, a small number of these structures experienced fatigue and fracture issues leading to the creation of the Fracture Control Plan (FCP). The FCP resulted in more stringent design, material, …
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Emergence of Delamination Fractures around Casing and Its Stability
… failure behavior around the casing. Then fracture critical energy, cohesive strength, and the deformability can be derived for cohesive zone constitutive equations by reproducing the loading-displacement curves from laboratory and inverse analyses. In this work, the comprehensive analysis …
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Alternate Load Paths and Retrofits for Long-span Truss Bridges under Sudden Member Loss and Blast Loads
… bridges following the initialed loss of a critical member can be attributed to “redundancy”. However, “redundancy”, also indicated as the post member failure behavior of long-span bridges is not well understood and is not explicitly considered, especially for long-span truss bridges. As one …