Session: 10-03: Advanced Manufacturing 3

Paper Number: 135948

135948 - Investigating the Effect of Supports on Reinforced Concrete Slab Subjected to Oblique Missile Impact 

Abstract: 

Evaluation on structural damage caused by missile impact has come to draw a lot of attention as the safety assessment on building structures of nuclear facility subjected to impact loading such as aircraft impact is prescribed as new regulatory requirement published by nuclear regulation authority. Concrete structure is extensively used in the construction of defense structures for certain safety-relevant nuclear facilities to withstand threats from external events. Therefore, it is important to investigate the behavior of concrete structure resistant to impact loading that may cause nuclear disaster. Generally, the missile impact probably results in local damage to the protective wall made of reinforced concrete (RC) material and overall structural response of the target depending on the impact conditions such as impact velocity, stiffness of missile etc. The local damage to the RC structure is mainly categorized as penetration, scabbing, and perforation. Most studies conducted till now on local damage of reinforced concrete (RC) slab structures subjected to missile impact are about normal impact, while few research related to oblique impact can be found. However, in the real circumstance, the missile is much more likely to impact RC structure with an angle of inclination, which can be regarded as oblique impact. The objective of this study is to carry out impact tests under different impact conditions including oblique impacts, to confirm the different impact behaviors of the RC slab structure, to develop an analysis method by investigating the test results and analytical conditions, and to validate the analysis method through comparison with the test results. We set up a numerical model and intend to compare the numerical results with the obtained test results related to damage zone of RC slab, reaction force and deformation of test specimen to validate the numerical method. All numerical analyses in this work were conducted using the explicit transient dynamic finite element code LS-DYNA developed by Livermore Software Technology Corporation.

This work also focuses on the effect of the stiffness of the supports for oblique impact on the reaction forces of RC slab. Until now, static loading tests were conducted to confirm the stiffnesses of the supporting parts that supported the RC specimen during oblique impact tests. Based on the obtained load-displacement relationships, and so on, the stiffnesses of the supporting parts are estimated. The findings obtained from the comparison between the numerical results using the experimental stiffness values as spring constants and the reaction force measurement results will be reported.

Presenting Author: Zuoyi Kang Japan Atomic Energy Agency

Presenting Author Biography: The author graduated from the Tokyo Institute of Technology in 2017 and now primarily focuses on the structural integrity assessment of nuclear power plant buildings. The authors are involved in investigating the dynamic characteristics of reinforced concrete structures in response to missile impacts. The research aims to enhance the safety and resilience of critical infrastructure in the face of potential threats.

Authors:

Zuoyi Kang Japan Atomic Energy Agency
Yukihiko Okuda Japan Atomic Energy Agency
Akemi Nishida Japan Atomic Energy Agency
Haruji Tsubota Japan Atomic Energy Agency
Masaharu Itoh Japan Atomic Energy Agency
Yinsheng Li Japan Atomic Energy Agency