Fracture-Critical System Analysis for Steel Bridges (2018) / Chapter Skim
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6 2.1 Summary of the State of the Practice Because of the 1967 collapse of the Silver Bridge, AASHTO published the first fracture control plan (FCP) for steel bridges in 1978 (AASHTO 1978, Lichtenstein 1993)
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7 2.1.1 Current Mandates and Specifications for FCMs The NBIS, which are part of the CFR, establish a base inspection interval of 24 months, extendable to 48 months through approval of FHWA for routine inspections. Some bridges may require shorter inspection intervals because of corrosion, traffic, and so on.
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8 • The Hoan Bridge carrying I-794 over the Milwaukee River in Milwaukee, Wisconsin, underwent failure of two girders in a continuous three-span, three-plate girder bridge in 2000 (Connor and Fisher 2002, Fisher et al.
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9 • Goto et al.
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10 where lR and lQ are the biases of resistance and load, VR and VQ are the coefficients of variation of resistance and load, and k is a scalar that increases with the target reliability level and is uniformly applied to both the load and resistance factors. The reliability principles used in the calibration of the AASHTO LRFD BDS have been employed to develop procedures for the assessment of redundant capacity (AASHTO 2014)
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11 was developed) , finite element models of existing bridges were developed to calculate the dynamic amplification factors after the failure of a primary steel tension member.
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12 (Cha et al. 2014, Digglemann 2012, Digglemann et al.
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