PSI - Issue 10

N.G. Pnevmatikos et al. / Procedia Structural Integrity 10 (2018) 195–202 N.G. Pnevmatikos et al. / Structural Integrity Procedia 00 (2018) 000 – 000

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 Create a stress or plastic rotation spectrum in the detail region of interested that must be determined by classify ing the stress or plastic rotations and the corresponding number of cycles in descending order.  For each range of stresses calculate the degree of existing (cumulative) damage from the S-N curve. Calculate the fatigue damage of the equivalent cyclic responses and combine individual contributions using appropriate rule.

(a)

(b)

Fig. 1. The location (a) and the frequency distribution of aftershocks (b) of Great Tohoku earthquake (north-east Honshu, Japan) on 18 March 2011, 9 Richer of magnitude.

The above four steps procedure can be applied in two ways. The first one is related to the high cycle fatigue approach using the aftershocks earthquakes, contains calculation of stresses from linear time history analysis, creation of stresses spectrum, find the number of cycles to the corresponding stresses from EC3 design chart, find the damage index and