[3J01-05] SeismicPRA

[3J04] Evaluation of Seismic Diversity of SSC system in PRA

Part 4: Improvement of calculation method for floor response spectrum

*Mitsuharu Ohara¹, Yasuki Ohtori¹, Hitoshi Muta¹, Yoshifumi Katayama², Toshiaki Sakai³ (1. TCU, 2. CEC, 3. CRIEPI)

Keywords:Seismic Diversity, Seismic PRA, Floor Response Spectrum, Response Spectrum, damping

The spectral modal analysis method can be easily estimate seismic diversity of equipment in a building. Since Yasui's formula used in the estimation is less accurate, improvement of floor response spectra is been desired. The major reason Yasui's formula assumes a steady-state response to seismic input, which makes it difficult to adapt to pulsed seismic input with short durations. Therefore, we have improved the estimation method of floor response spectra and also damping correction factor.