Inspection and Management of Bridges with Fracture-Critical Details (2005) / Chapter Skim
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Appendix D - Annotated Bibliography
Appendix D - Annotated Bibliography
Pages 68-75
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From page 68... ...
and K.R. White, "Secondary Load Paths in Bridge Systems," Transportation Research Record 1290, Transportation Research Board, National Research Council, Washington, D.C., 1991, pp.
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From page 69... ...
and L.G. Jaeger, "Multi-Load Path Structures for Highway Bridges," Transportation Research Record 711, Transportation Research Board, National Research Council, Washington, D.C., 1979, pp.
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From page 70... ...
• Various analytical techniques could be used to investigate the linear elastic response of damaged flexural systems to loads that include reverse design using AASHTO; more sophisticated methods than AASHTO; and finite-difference, finite-strip, or finite-element methods. Nonlinear analysis for all critical stresses and deformations must be accurately determined.
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From page 71... ...
reviewed several definitions of redundancy factors of existing steel girder bridges. Furthermore, an analytical model was developed to study the degree of redundancy of E-15-AF Colorado State Bridge in the presence of corrosion damage using the definition of the redundancy factor R provided in (11)
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From page 72... ...
Knowing that redundancy of structures could result from the reserve capacity of its members when stressed beyond their yield or buckling strength, Kritzler and Mohammadi (15) defined redundancy as "the degree of reverse strength available for preventing failure of an entire structural system." They evaluated the degree of redundancy of bridges based on the difference between the safety index of the redundant structure, considering all of its failure paths and the safety index of the exact same structure with no alternative load path where redundancy measure is computed by subtracting the damage safety index (βs)
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From page 73... ...
considered the overstress limit state and the fatigue limit state for the evaluation of bridges. The overstress limit state refers to the extreme event in which the maximum load effect exceeds the bridge strength capacity.
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From page 74... ...
The analysis revealed that after major damage has occurred in the exterior girder at the midspan, the load is redistributed mainly among the structural components in the vicinity of the damage. It was also noted that a significant amount of internal redundancy exists in simple-span steel highway bridges, resulting in a large increase in deformations and stresses at the vicinity of the exterior girder after it develops a sever damage.
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From page 75... ...
The Bridge Safety Assurance Task Force was formed primarily in response to the fatal collapses of Connecticut's Mianus River Bridge in 1983 and the New York State Thruway Schoharie Creek bridge collapse in 1987 as a result of scour. The task force included experts in various fields related to bridge engineering in the areas of hydraulics, river mechanics, concrete, and steel.
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