Failure modes of piping under seismic loads which have both load and displacement controlled characteristics

摘要

Evaluation for BDBE requires best estimation based on realistic failure phenomena. However failure modes of piping under seismic loads are not clear, because seismic load is alternate one and has both load- and displacement-controlled characteristics. For design and seismic PRA (probabilistic risk assessment), the failure mode is assumed to be collapse under PGA (peak ground acceleration). However, this conservative assumption is not appropriate for risk assessment with best estimation and uncertainty. The objective of this study is the clarification of realistic failure modes of piping under seismic loads.