2024 Volume 80 Issue 13 Article ID: 23-13114
The level of earthquake ground motions applied to critical facilities for the seismic design of nuclear power plants is increasing, and there is concern that liquefaction may occur even in dense ground. Furthermore, there is no established method for evaluating damage due to liquefaction for RC circular shafts, which have been increasingly adopted in recent years. In this paper, we first conducted a dynamic centrifuge test with the aim of establishing a damage evaluation method due to liquefaction in dense sand ground, targeting an RC circular shaft built in dense sandy ground. Through this test, we were able to understand the damage and acting loads on the RC circular shaft and obtained experimental data to verify the validity of the damage evaluation method. Next, we proposed a two-step damage evaluation method that combines response evaluation of structures and soil using 2D effective stress analysis and damage evaluation of structures using 3D non-linear analysis. In addition, we performed a reproduction analysis of a dynamic centrifuge test using the proposed method and confirmed that the proposed method can reproduce the damage caused by an earthquake in an RC circular shaft.
