In modern society, an ever-increasing emphasis is placed on structural safety design that not only considers external loading but extends to reduced electromagnetic interference. Generally, studies only consider shielding effectiveness of strengthening method or materials, and few studies have considered the relationship between damaged areas and shielding effectiveness. Therefore, the influence of metallic grid parameters and fiber reinforced concrete (HSDC) on shielding effectiveness with and without impact loading are studied in this research. Concrete wall strengthening with four types of metallic grid and three thickness types of HSDC were considered. Moreover, the relationship between damaged area ratio and shielding effectiveness was evaluated utilizing the low-velocity drop-weight impact test. In specimens with metallic grid or HSDC, shielding effectiveness with strengthening layer (13.4–64.1%) or thickness (35.6–46.2%) increase and grid size (> 7.8%) decreased. Specimen strengthened by smaller than 55.1% and 101% of the free space area ratio of single and double layer, respectively, exhibit more than 40 dB shielding effectiveness. For the specimen strengthened with HSDC, shielding effectiveness increased with strengthening area, except smaller than 6%. The smallest metallic grid and the thickest HSDC strengthening specimen exhibited improved impact resistance and great shielding effectiveness after impact loading.
Bibliographical noteFunding Information:
This research was supported by a grant (19SCIP-B146646-02) from Construction Technology Research Project funded by the Ministry of Land, Infrastructure and Transport of Korea government.
© 2022, Wroclaw University of Science and Technology.
- Damage area ratio
- Electromagnetic shielding
- High-strength high ductility concrete
- Impact resistance
- Metallic grid
ASJC Scopus subject areas
- Civil and Structural Engineering
- Mechanical Engineering