Fracture Resilience of Steel Built-Up Members Subjected to Flexure

Hebdon, Matthew H.; Martín, Francisco J. Bonachera; Korkmaz, Cem; Connor, Robert

doi:10.1061/(asce)be.1943-5592.0001059

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…2.2.4. Hebdon et al (2015), Hebdon et al (2017a), and Hebdon et al (2017b) Phase I of this pooled fund research project investigated the behavior of built-up flexural members in a partially failed state. Fifteen full-scale built-up steel girders were tested in the following manner.…”

Section: Damaged Remaining Componentmentioning

confidence: 99%

Member-Level Redundancy of Built-Up Steel Axially Loaded Members

Lloyd¹,

Martín²,

Korkmaz³

et al. 2019

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Section: Damaged Remaining Componentmentioning

confidence: 99%

Member-Level Redundancy of Built-Up Steel Axially Loaded Members

Lloyd¹,

Martín²,

Korkmaz³

et al. 2019

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“…Transportation Pooled Fund Project TPF-5(253), "Evaluation of Member Level Redundancy in Built-up Steel Members," was conceived and completed to address all of the critical issues related to performing a "credible" analysis to identify built-up members that have adequate internal redundancy to resist complete failure of the cross-section should one component suddenly fail (Hebdon et al, 2017a(Hebdon et al, , 2017bLloyd, 2018). The resistance to such a failure mode is referred to as cross-boundary fracture resistance (CBFR).…”

Section: Through Internal Redundancymentioning

confidence: 99%

Simplified Transformative Approaches for Evaluating the Criticality of Fracture in Steel Members

Connor

2019

Eng J

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There has been considerable research and interest in the topic of fracture-critical members (FCM) during the past decade. As a result, the entire concept of what constitutes an FCM is being revisited, and many long-standing ideas and opinions related to this classification of members are being shown to be overly conservative. Significant advances in the understanding of fracture mechanics, material and structural behavior, fatigue crack initiation, fatigue crack growth, fabrication technology, and inspection technology have allowed other industries to address fracture—or, more importantly, control of fracture—in a more integrated manner. After years of research, new stand-alone AASHTO guide specifications that give codified direction on how to perform 3D system analysis to verify system redundancy, as well as guide specifications to evaluate internal member-level redundancy of mechanically fastened built-up members for both new and old bridges, have been proposed. Additional research demonstrating the benefits of exploiting the improved toughness of modern high-performance steel (HPS) grades has been completed. Through these advances, it is now possible to create an integrated fracture control plan (FCP) combining the original intent of the 1978 FCP with modern materials, design, fabrication, and inspection methodologies. Further, an integrated FCP provides economic benefits and improved safety to owners by allowing for a better allocation of resources by setting inspection intervals and scope based on sound engineering rather than based simply on the calendar. In summary, an integrated FCP encompassing material, design, fabrication, and inspection can ensure fracture is no more likely than any other limit state, ultimately allowing for a better allocation of owner resources and increased steel bridge safety. This paper summarizes some of the recent advancements related to the topic of the FCM and provides a suggested approach to providing more rational treatment of such members without compromising reliability.

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“…Previous research that carried out large-scale fracture tests on mechanically fastened built-up steel members subjected to flexural or axial loads demonstrated resistance to complete member fracture due to cross-boundary fracture resistance (CBFR) (Hebdon et al, 2017;Lloyd et al, 2021). Additionally, Diggelmann et al (2013) used shape charges to simulate fracture on the tension chord at midspan of the Milton-Madison deck truss approach span while the bridge was loaded with approximately 75 kips of sand placed on the middle third of the span.…”

Section: Introductionmentioning

confidence: 99%

Internal Redundancy of Mechanically Fastened Built- Up Steel Axially Loaded Two-Channel Members

Lloyd,

Bonachera Martin,

Korkmaz

et al. 2023

Eng J

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Previous research on large-scale fracture tests on mechanically fastened built-up steel members subjected to flexural or axial loads demonstrated resistance to complete member fracture due to cross-boundary fracture resistance (CBFR). This paper builds on and expands that work through additional experimental and analytical research into behavior of two-channel mechanically-fastened built-up axial steel members following fracture of a single component. Finite-element-based parametric studies were conducted to characterize the static load redistribution behavior of axial members comprised of two channels, following a fracture event. FEMs were calibrated using experimental data obtained from full-scale testing. Simplified solutions were developed to estimate the after-fracture load capacity and the fatigue stress range in a remaining channel. The solutions are used to evaluate the internal redundancy of mechanically fastened built-up two-channel members. If this member type is found to be internally redundant during an evaluation, the developed solutions can then be used to reliably predict fatigue life of the member in the faulted state and establish the special inspection interval according to the relevant provisions of AASHTO.

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Fracture Resilience of Steel Built-Up Members Subjected to Flexure

Cited by 8 publications

References 4 publications

Member-Level Redundancy of Built-Up Steel Axially Loaded Members

Member-Level Redundancy of Built-Up Steel Axially Loaded Members

Simplified Transformative Approaches for Evaluating the Criticality of Fracture in Steel Members

Internal Redundancy of Mechanically Fastened Built- Up Steel Axially Loaded Two-Channel Members

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