The Benefits of Providing Redundancy to Non-redundant Structures

McGormley, Jonathan C.; Hill, Howard J.; Koob, M J

doi:10.2749/222137900796314211

Cited by 1 publication

(1 citation statement)

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“…The two events identified were: (1) the failure of a PSTM and the concurrent live load and dynamic effects, and (2) a post-failure service period, as supported by the large number of documented cases of PSTM failure in which the failure was not detected for an extended period of time when the bridge continued to carry traffic. The Lafayette Bridge, the Neville Island Bridge, the Green River Bridge, the US 422 bridge over the Schuylkill River, and the Diefenbaker Bridge are examples of two-girder bridges that underwent partial or complete failure of a girder and continued to carry traffic (15)(16)(17)(18)(19).…”

Section: Reliability and Redundancy In Steel Bridgesmentioning

confidence: 99%

Load Combinations for the Evaluation of Redundancy in Steel Bridges

Martín

Connor

2022

Transportation Research Record

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Over the past decade, there has been considerable interest in the development of quantitative analytical procedures to determine if a primary steel tension member (PSTM) is a fracture critical member (FCM). Traditionally, this designation has most often been arbitrarily determined based simply on the bridge geometry, for example, the number of girders in the cross section, rather than an evaluation of the bridge in the faulted state. Clearly, such a redundancy evaluation must address the loading scenarios concurrent with failure of the PSTM, the likelihood of the member failure, the acceptable probability of load exceeding resistance in the faulted state, and the application of vehicular live load models. This research was conducted to develop a load model and load combinations that are specific to evaluating the performance of a bridge in the event a steel member was to fracture. Specifically, two load combinations were developed to evaluate the strength of a steel bridge, one for the event in which the failure of a PSTM occurs, and another for a post-failure service period. The development adhered to the reliability-based principles and procedures applied in the calculation of load combinations currently used in bridge engineering to facilitate direct implementation and to ensure consistency with current steel bridge design and evaluation procedures contained in the AASHTO LRFD Bridge Design Specifications.

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Section: Reliability and Redundancy In Steel Bridgesmentioning

confidence: 99%