J101022 エネルギーによる耐震性評価([J10102]原子力施設の耐震安全性に関する実験的・解析的検討(2))

概要

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Industrial facilities such as power plants require high anti-seismic performance. Generally seismic design of mechanical structures in industrial facilities is based on static force in elastic region. However dynamic cyclic load may causes failure on the structures during actual earthquakes. Therefore quantitative evaluation of cumulative damage by earthquakes is required. In addition, evaluation method of soundness after a huge earthquake is also required. Authors have dealt with this issue from the viewpoint of the energy balance equation. Since energy indicates cumulative information of motion, the energy balance equation is suitable to evaluate cumulative damage and a margin for fracture. This paper describes seismic evaluation method using energy. At first, energy balance equations of both SDOF and MDOF are introduced. After that, relation between energy and failure is investigated by forced vibration experiments. As a result, it was confirmed that more input energy is needed for failure when time for failure is long, more input energy is needed for failure when increment of input energy is small and more input energy is needed for failure in case of small input acceleration.
2011-09-11