Reference Guide for Applying Risk and Reliability-Based Approaches for Bridge Scour Prediction (2013) / Chapter Skim
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41.1 Introduction Load and resistance factor design (LRFD) incorporates state-of-the-art analysis and design methodologies with load and resistance factors based on the known variability of applied loads and material properties.
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Introduction and Applications 5 the uncertainties associated with the prediction of individual scour components. This reference guide incorporates these uncertainties into a reliability analysis framework to estimate the probability of scour level exceedance for the service life of a bridge.
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6 Reference Guide for Applying Risk and Reliability-Based Approaches for Bridge Scour Prediction 1.2.2 Floodplain Risk and Flood Control Facilities In many areas along larger river systems and in close proximity to large urban areas, flood control facilities such as levees, dikes, and flood-relief structures are used to protect the public from major floods (see Figure 1.2)
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Introduction and Applications 7 establish the probability of exceeding design flood elevations or determine the probability of occurrence of critical flow velocities in excess of failure thresholds used as a basis for design. Nationally, roughly 2,000 federal levees extend over some 13,000 miles; more than 20,000 nonfederal levees also exist whose extent has yet to be fully identified.
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8 Reference Guide for Applying Risk and Reliability-Based Approaches for Bridge Scour Prediction (a) Blunn Creek, Austin, TX, before restoration (b)
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Introduction and Applications 9 current guidance from FHWA and AASHTO LRFD statistical methods and procedures used in bridge structural design from the perspective of a hydraulic engineer. Chapter 3 describes an approach to evaluating the uncertainty of the three scour components.
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10 Reference Guide for Applying Risk and Reliability-Based Approaches for Bridge Scour Prediction the information in Appendix B Examples are presented for a range of bridge configurations and hydrologic/geomorphic settings where hydraulic input is developed from both 1-D and 2-D models.
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