Abstract
In the present paper, a methodology is presented for seismic fragility analysis of pressurized piping systems considering ratcheting. The methodology is applied for a typical piping system, which was considered for an international benchmark exercise on seismic margin assessment. A numerical tool, which was earlier validated with experimental results on ratcheting in pressurized piping components and systems, is used for evaluation of strains in piping system. Variations in damping and natural frequency of the piping system are considered for the fragility assessment in addition to ground motion variability. Twenty intra-plate earthquake records are considered for ground motion variability. Three performance levels are considered for the assessment: first one is the present design stress limit, remaining two are strain limits based on codal guidance and experiments. Response surface techniques in conjunction with Monte Carlo simulations are used for fragility evaluation.
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