In recent years, it has been recognized that Natural hazard triggered technological accidents (Natech) is one of the problems to consider. Therefore, for Natech risk assessment, it is important to understand the structural failure modes of components, the criteria for their required functions in industrial facilities, and the relationship between them in BDBE (beyond design basis events). This paper shows the elasto-plastic response of three piping test specimens, investigated through shaking table tests and corresponding Finite element analysis (FEA). According to the acceleration response ratio, the equivalent damping ratio ζ of all test specimens generally decreased due to elasto-plastic behavior. On the other hand, under certain specific conditions, the acceleration response ratio also showed a temporary increase. To simulate the overall elasto-plastic behavior, the authors conducted a parametric FEA, using the stiffness of the system and the damping ratio as parameters. A comparison between the experimental and FEA results suggests that the increase in the acceleration response ratio was caused by a decrease in overall stiffness, while the decrease in the ratio was caused by an increase in overall damping due to the elasto-plastic behavior.
TAKEDA et al. (Wed,) studied this question.
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