[3F11-16] Improving Resilience of Nuclear Structure

[3F14] Development of Failure Mitigation Technologies for Improving Resilience of Nuclear Structures

(18) Failure sequence control under excessive earthquakes - Examination of seismic response reduction of piping system by the pipe-support failure

*Izumi Nakamura¹, Naoto Kasahara² (1. National Research Institute for Earth Science and Disaster Resilience, 2. The University of Tokyo)

Keywords:Excessive seismic load, Piping system, Support structure, Multiple failure of supports, Response reduction

As a specific example of the failure sequence control method under excessive earthquake, piping systems are considered. One possible procedure to realize the failure sequence control is to make supports fail in prior to pipe body itself, and to prevent the damage to pipe body. Based on this concept, a case study was conducted by analysis on a simplified piping system model with supports. In the analysis, it was assumed that the support structure be lost when exceeding a certain load, and the effect of the loss of supports was investigated. In this paper, the variation in the vibration mode and seismic response of piping systems with/without supports, and the possibility of failure sequence control are discussed.