Electromagnetic interference shielding has received attention for decreasing radiation and electromagnetic waves to protect humans or equipment in design processes. There are several traditional methods to strengthen the shielding performance, such as using conductive paints, conductive fibers, or grids on non-damaged structures. However, few studies have considered the relationship between shielding effectiveness and the damaged area used by hybrid reinforcement methods for improving shielding effectiveness and structural performance. To evaluate the relationship between shielding effectiveness and damaged area, we designed reinforced concrete (RC) walls strengthened by steel fiber, metallic grid/mesh reinforcement, and hybrid reinforcement and created damage area through impact load. The hybrid reinforced specimens had approximately 25.9 times and 2.4 times higher shielding effectiveness than 300 mm thick RC and single-type reinforced specimens. In the relationship between the shielding effectiveness and damaged area, specimens reinforced by metallic mesh exhibited more than 30 dB shielding effectiveness and 150 % free area ratio. Meanwhile, specimens reinforced by metallic mesh and grid exceeded 40 dB shielding effectiveness.
Bibliographical notePublisher Copyright:
© 2022 by Korea Concrete Institute.
- damage area ratio
- electromagnetic shielding
- impact resistance
- metal grid
- steel fiber
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Materials Science (miscellaneous)
- Mechanics of Materials