LRFD Metal Loss and Service-Life Strength Reduction Factors for Metal-Reinforced Systems (2011) / Chapter Skim
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development of appropriate resistance factors for use in LRFD that account for metal loss caused by corrosion. Calibration of the resistance factors uses load factors from the AASHTO LRFD specifications C H A P T E R 2 Research Approach
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In particular, resistance factors for design of MSE walls are recommended that take into account the estimated metal loss over the service life of the installation. Metal loss parameters will be updated as appropriate for galvanized and plain steel reinforcements, while taking into consideration different backfill characteristics.
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assessed the load bias for metallic MSE reinforcements using the simplified and coherent gravity methods of analysis, respectively. We have used the load bias from these references to calibrate resistance factors for LRFD.
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of lognormal load bias. Strip Grid Parameter Simplified Method1 Coherent Gravity Method2 Simplified Method1 Coherent Gravity Method2 0.973 1.294 0.973 1.084 0.449 0.499 0.449 0.737 1Allen et al.
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16 Figure 5. Monte Carlo simulation example showing input and output reports.
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If the metal loss is assumed to be deterministic, the only variable (i.e., not a constant) describing the tensile strength remaining at the end of service condition corresponds to yield strength, Fy.
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