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임홍철(Rhim Hong-Chul),송지윤(Song Jee-Yun),서정호(Seo Jung-Ho) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.10
In recent years, new construction methods and building materials are being developed for more economic and time-saving construction especially for underground structures. In the process of top-down construction, a need for installing perimeter beams to support earth-retaining structures and beams from prefounded columns can cause delay of total construction time. A newly developed opened slab system can eliminate the perimeter beams by forming a slab floor which includes the structural function of the perimeter beams. In this paper, the details of the opened slab system have been described and the results of compressive tests on the opening areas of the slabs. The developed system is currently used in several construction sites and compared with existing methods for its advantages in this paper.
임홍철 ( Rhim Hong-chul ),우상균 ( Woo Sang Kyun ),송영철 ( Song Young-chul ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
비파괴 검사에 널리 쓰이는 Ground Penetrating Radar (GPR)의 콘크리트 내 철근과 공동 탐사 성능을 알아 보기 위해, 일련의 실험을 실시하였다. 레이더를 이용한 탐사는 사용하는 안테나의 주파수에 가장 큰 영향을 받으며, 실험에서는 900MHz. 1 GHz, 1.5 GHz 3개의 안테나를 사용하였다. 콘크리트 기본시편의 크기는 1,000 mm (길이) × 1,000 mm (폭) × 140 mm (두께)이고, 철근과 공동의 크기와 매립 위치를 바꾸어 실험하였다. 모든 경우에서 철근과 공동을 성공적으로 탐사하였으며, 각 안테나 주파수에서의 특성을 파악하였다. 또한 상업용 레이더 시스템의 영상 처리 결과를 향상시킨 결과를 다루었다. Ground Penetrating Radar (GPR) has been used to image inside concrete specimens embedded with steel bars and delamination. An imaging algorithm has been developed to improve measurement output generated from a commercial radar system. For the experiments, laboratory size concrete specimens are made with the dimensions of 1,000 mm (W) x 1,000 mm (L) x 140 mm (D). The results have shown improved output of the radar measurements compared to commercially available processing methods.
Microstrip Patch 안테나를 이용한 탄소섬유보강 콘크리트의 박리 탐사
임홍철(Rhim Hong-Chul),이효석(Lee Hyo-Seok) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
A series of experimental work has been conducted to evaluate the capability of microstrip patch antenna and horn antenna system in detecting delamination between fiber reinforced polymers (FRP) and reinforced concrete. Two antennas at 15 ㎓ frequency are used in the experiments for laboratory size specimens. The laboratory size specimens have the dimensions of 600 ㎜ (length) × 600 ㎜ (width) × 50 ㎜ (thickness) with a delamination of 300 ㎜ (length) × 300 mm (width) × 5 ㎜ (thickness). The cover depth of the delamination is varied as follows: 5 ㎜, 10 ㎜, and 15 ㎜. In all cases, the delamination has de en successfully identified. Also, it was shown that the image results in microstrip patch antenna was improved by signal processing.
단면형상이 레이더 측정에 미치는 영향 및 영상화 기법에 대한 연구
임홍철(Rhim Hong-Chul),손병오(Son Byung-Oh),김유석(Kim You-Seok) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.6
Radar is widely used as a method of nondestructive testing of structures. A lot of experimental studies were made to develope radar method. In this study, brief theory about radar and properties of electromagnetic wave travelling inside concrete are introduced which is fundamental to understand radar method. The purposes of this study are to verify effect of concrete specimen geometry on radar measurement and to propose a signal processing method to image delamination and steel bars embedded in concrete. The experimental data were obtained using Inverse Synthetic Aperture Radar (ISAR) with the frequency bandwidth of 2∼3.4 GHz and 3.4∼5.8 GHz. All data were processed by means of frequency combination. Computer programs used in this study include windowing and Inverse Fourier Transform.
임홍철 ( Rhim Hong-chul ),이숭재 ( Lee Soong-jae ),우상균 ( Woo Sang-kyun ),송영철 ( Song Young-chul ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.2
비파괴 검사에 널리 쓰이는 Ground Penetrating Radar (GPR)의 콘크리트내 공동 탐사 성능을 알아보기 위해, 일련의 실험을 실시하였다. 공동 탐사는 사용하는 안테나의 주파수에 가장 큰 영향을 받으며, 실험에서는 900 MHz, 1 GHz, 1.5 GHz 3개의 안테나를 사용하였다. 콘크리트 기본시편의 크기는 1,000 mm (길이) × 600 mm (폭) × 140 mm (두께)이고, 공동은 200 mm (길이) × 600 mm (폭) × 50 mm (두께)의 크기를 갖고 있다. 공동의 매립 깊이를 20 mm, 30 mm, 60 mm, 70 mm 4개고 달리한 결과, 모든 경우에서 공동을 성공적으로 탐사하였으며, 각 안테나 주파수에서의 특성을 파악하였다. 또한 상업용 레이더 시스템의 영상 처리 결과를 향상시킨 결과를 논문에서 다루었다. A series of experimental work has been conducted to evaluate the capability of Ground Penetrating Radar (GPR) system in detecting delamination inside concrete. Three antenna at 900 MHz, 1000 MHz, and 1500 MHz frequency are used in the experiments for laboratory size specimens, and 400 MHz antenna has been used for a large size specimen. The laboratory size specimens have the dimensions of 1,000 mm (length) × 600 mm (width) × 140 mm (thickness) with a delamination of 200 mm (length) × 600 mm (width) × 140 mm (thickness). The cover depth of the delamination is varied as follows: 20 mm, 30 mm, 60 mm, and 70 mm. In all cases, the delamination has been successfully identified. The property of three frequencies was seized about detecting delamination. Also, it was shown that the image results in GPR were improved by signal processing.
PC계단 공법 성능개선을 위한 현장사례에 근거한 요소기술 분석
임홍철(Rhim Hong-Chul),김욱종(Kim Ook-Jong),조홍덕(Cho Hong-Duk),송지윤(Song Jee-Yun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.6
Stairways made by Precast Concrete(PC) are emerging as alternative to traditional Reinforced Concrete(RC) stairways, PC stairs can reduce construction time and cost with improved quality compared to RC stairs. The existing PC stairway construction method often requires the placement of surrounding walls and PC stairways at the same time to secure connection between the two elements. The method described in this paper has the advantage of allowing the construction of walls and stairways in sequence, not together, this is possible because of developed technique for the connection and the other convenient ways for the PC stairways. Application of the method in various construction sites is analyzed and studied for further development.
[제6분과/연구위원회 특별 Session] Nondestructive Testing of Concrete Using Electromagnetic Method
임홍철(Rhim Hong-Chul),우상균(Woo Sang-Kyun),송영철(Song Young-Chul) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
비파괴 검사에 널리 쓰이는 Ground Penetrating Radar(GPR)의 콘크리트 내 철근과 공동 탐사 성능을 알아 보기 위해, 일련의 실험을 실시하였다. 레이더를 이용한 탐사는 사용하는 안테나의 주파수에 가장 큰 영향을 받으며, 실험에서는 900MHz, 1GHz, 15Ghz 3개의 안테나를 사용하였다. 콘크리트 기본시편의 크기는 1,000mm(길이) X 1,000mm(폭) X 140mm(두께)이고, 철근과 공동의 크기와 매립 위치를 바꾸어 실험하였다. 모든 경우에서 철근과 공동을 성공적으로 탐사하였으며, 각 안테나 주파수에서의 특성을 파악하였다. 또한 상업용 레이더 시스템의 영상 처리 결과를 향상시킨 결과를 다루었다. Ground Penetrating Radar (GPR) has been used to image inside concrete specimens embedded with steel bars and delamination. An imaging algorithm has been developed to improve measurement output generated from a commercial radar system. For the experiments, laboratory size concrete specimens are made with the dimensions of 1,000 mm (W) x 1,000 mm (L) x 140 mm (D). The results have shown improved output of the radar measurements compared to commercially available processing methods.