Nonlinear Finite Element Analysis of RC Walls Subjected to Tsunami and Debris Impact
- Atsushi Shibayama (Central Research Institute of Electric Power Industry) | Yoshinori Miyagawa (Central Research Institute of Electric Power Industry) | Naoto Kihara (Central Research Institute of Electric Power Industry) | Hideki Kaida (Central Research Institute of Electric Power Industry)
- Document ID
- International Society of Offshore and Polar Engineers
- The 27th International Ocean and Polar Engineering Conference, 25-30 June, San Francisco, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2017. International Society of Offshore and Polar Engineers
- finite element analysis, debris impact, large-scale experiment, RC sea wall, tsunami, three-dimensional behavior
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- 15 since 2007
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In order to evaluate damage risks of reinforced concrete structures against tsunami, it is important to investigate a response of the RC structure by using appropriate analytical methods. In this study, through large-scale experiments and nonlinear three dimensional finite element analysis, we investigated the three-dimensional behavior of the RC vertical wall subjected to tsunami wave force and tsunami debris impact force.
Authorities are under pressure to reconsider the formulation of tsunami countermeasures for reinforced concrete structures (hereafter referred to as RC structures), including nuclear power plants, because of the damages from the gigantic tsunami that followed the 2011 Great East Japan Earthquake (Nandasena et al., 2012). To assess responses of RC structures by using appropriate analysis methods is essential in order to evaluate the risks under tsunami events. Moreover, two different types of superimposing external forces with significantly different timing of actions, namely wave pressure and impact from debris, must be taken into consideration. Furthermore, taking required time and simple shape of RC sea wall into account, a two dimensional structural analysis is preferable (Miyagawa et al., 2015). However, RC sea wall may potentially undergo three-dimensional behaviors, depending on the impact locations of the tsunami debris.
In this research, a large-scale debris impact experiment was first conducted to experimentally investigate the response of RC vertical wall subjected to the wave pressure and debris impact forces. Next, a reproducibility analysis of the experiment was performed with a nonlinear finite element analysis, in order to conduct a detailed examination on the response of RC vertical wall, as well as to examine the adaptability of the finite element analysis.
LARGE-SCALE DEBRIS IMPACT EXPERIMENT
The experiment was conducted using a large-scale tsunami physical simulator at the Central Research Institute of the Electric Power Industry (Fig. 1) to investigate the response of the RC vertical wall that sustain the tsunami wave pressure and debris impact force (e.g., Kihara et al.,2015, Shibayama et al., 2015). An RC vertical wall was installed on the dry bed of the test channel and logs were loaded on the tsunami flood and impacted on the wall. The experiment variables were input waveform, number of logs, and their initial installation angles. The experiment was conducted for 10 cases. One case involved an experiment with only the tsunami wave pressure applied on an RC vertical wall. The remaining nine cases were experiments with the tsunami wave pressure and the impact force of tsunami debris acting on the wall. The outline of experiment is summarized in Table 1.
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