United States Department of Transportation
i
Reliability-based evaluation of bridge components for consistent safety margins.
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2010-10-01
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[PDF-1.77 MB]
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Abstract:The Load and Resistant Factor Design (LRFD) approach is based on the concept of structural reliability. The approach is more
rational than the former design approaches such as Load Factor Design or Allowable Stress Design. The LRFD Specification for
Bridge Design has been developed through the 1990s and 2000s. In the development process, many factors were carefully calibrate
such that a structure designed with LRFD can achieve a reliability index of 3.5 for a single bridge girder (probability of failure of
about 2 in 10,000). As the initial development of the factors in the LRFD Specification was intended to be applied to the entire natio
state-specific traffic conditions or bridge configuration were not considered in the development process. In addition, due to lack of
reliable truck weigh data in the early 1990s in the U.S., the truck weights from Ontario, Canada measured in the 1970s were used for
the calibration. Hence, the reliability of bridges designed with the current LRFD specification need data and the load factor needs to be re-calibrated for optimal design of bridges.
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