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Top-Down 공법용 무지주 거푸집 Easy Down 공법 개발
임홍철(Rhim Hong-Chul),정미라(Jeong Mee-Ra),강두현(Kang Doo-Hyun),유광준(Yoo Kwang-Jun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
For a Top-Down or Downward construction method, it is essential to provide an efficient formwork system for the placement of concrete slab. This paper presents a new slab supporting formwork system called "Easy Down" developed especially for the Top-Down construction method. The Easy Down system is designed for the support of formwork and the weight of reinforced concrete slab from the top of prefounded columns located at ground level through a hanging device. Thus, cumbersome formwork supporting mechanism is reduced or even avoided compared to the existing methods. The details of the Easy Down system and the results of mock-up tests are presented and discussed in this paper.
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.
임홍철 ( Rhim Hong-chul ),조영식 ( Cho Young-sik ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
The purpose of this study is measuring of exsiting steel stress using magnetostriction. A successful application of magnetostriction method for measuring steel stress depends on the linearity of the relationship between the elastic and magnetic response due to loading. Linearity has been found out recent studies. Also geomagnetic field and load history is a key parameter. To investigate the correlation between magnetostriction and two key parameter, different diameter steel bars loaded in tension under uniaxial loading was measured magnetic field in three direction (perpendicular, north, east-west) with gauss meter. Results showed relationship between geomagnetic field, load history and magnetic field.
[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.
임홍철 ( Rhim Hong-chul ),이규동 ( Lee Kyu-dong ),박성모 ( Park Sung-mo ),임병호 ( Yim Byung-ho ),이민섭 ( Lee Min-sup ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
재건축 현장에서의 실 구조물을 대상으로 하는 중성화 실험으로 코어 채취를 통해 얻어낸 중성화 정도와 중성화 추정식과의 값을 비교하고, 중성화와 건물 위치 간의 관계를 규명하여 최종적으로는 리모델링 시 구조물의 잔존내구연한을 판별하는데 사용가능한 모델을 구축하도록 한다. Carbonation test of concrete have been conducted to investigate the degree of carbonation from different concrete members. Reconstruction site was selected because core sampling of concrete could be made without affecting the integrity of the building because it would be demolished after tests. The results have shown that carbonation occurred more in the concrete members located inside the building to compared the ones located near the outer side of the building
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.
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.
광섬유 격자 센서를 이용한 모르타르시편의 온도구배 및 열 변형 측정
임홍철 ( Rhim Hong-chul ),이은주 ( Lee Eun-joo ),전흥재 ( Chun Heung-jae ),박동녘 ( Park Dong-nyuck ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.3
FBG sensor의 다중 측정성을 이용하여 모르타르 시편의 열 변형률과 온도 변화를 동시에 측정하였다. 또한, 광섬유 격자 센서를 이용하여, 열 변화에 따른 모르타르 시편의 내부 온도 구배를 측정하였다. 열 변형률을 기존 strain gauge와 함께 측정하였을 때, strain gauge는 섭씨 60도 이상의 온도에서 오차를 보이는 반면, FBG 센서는 안정된 측정값을 나타냈다. FBG 온도 sensor로 측정한 온도 변화량은 thermocouple로 측정한 값과 비교하였으며, 선형적인 대응관계를 보였다. As concrete structures are heated, thermal strain can be developed. Because of the boundary conditions, the thermal stress may be arisen. Thermal strain and temperature were measured simultaneously using an optical fiber sensor. Fiber Bragg Grating Sensor(FBG sensor) was used in the measurement. Because it can measure the strains more than two points with one line, it was possible to measure both thermal strain and temperature with one line. To compare data measured by FBG sensor, strain and temperature were measured using strain gauge and thermocouple. The FBG sensor could measure the strain under the temperature greater than 60°C but strain gauge couldn’t. Both the FBG temperature sensor and thermocouple could measure the temperature and the results are related each other linearly.
임홍철 ( Rhim Hong-chul ),박성모 ( Park Sung-mo ),이규동 ( Lee Kyu-dong ),임병호 ( Yim Byung-ho ),이민섭 ( Lee Min-sup ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
재건축 현장에서 콘크리트 부재에 대한 철근탐사를 수행함으로서 철근의 배근 간격과 피복두께, 철근 직경을 확인하고 설계도면과 비교해 본다. 구조해석 프로그램을 이용하여 기둥, 보, 슬래브 각각의 부재에 대한 구조해석을 비파괴 검사를 바탕으로, 그리고, 설계도면을 바탕으로 수행, 비교해 보고 현장에서 채취한 슬래브 부재를 실험실에서 파괴시켜 얻은 결과와 최종적으로 비교함으로써 부재의 내력을 확인한다. At a reconstruction site, steel bar detection has been performed on each concrete members to confirm horizontal and vertical spacing of each bar, cover depth, and the diameter of rebar. By using structural analysis program, the results of both nondestructive test and structural drawing of column, beam, and slab members are compared. Finally, the capacity of the members re verified by comparing the output of destructive test from the laboratory.