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전기저항과 압전소자를 이용한 무선 손상자현 스마트 콘크리트의 개발
김이성 ( Kim Ie Sung ),이수곤 ( Lee Soo-gon ),김화중 ( Kim Wha-jung ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. Therefore, what the time for repairing the damage portion is understands importantly by such cracks. PZT and Electric Resistance are widely used to experiment in damage of element. If pressure is received, resistance and voltage will increase, and if tension is received resistance and voltage will decrease in Electric resistance and PZT. They are interested in the crack monitoring of structure using FM radio sensor and PZT sensor. In this study, the monitoring to a crack was studied using FM radio sensor and PZT sensor. Therefore, the purpose of this study is the fundamental research which detects damages of main members using the compound sensor which consisted of the radio sensors of resistance, PZT, and FM system.
LED와 유리관 스위치 센서를 이용한 스마트 콘크리트의 개발
김이성(Kim Ie-Sung),이수곤(Lee Soo-Gon),고주환(Ko Joo-Hwan),김동혁(Kim Dong-Hyeok),김화중(Kim Wha-Jung) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
Today, peoples have much interest about safety while an abnormal weather phenomenon is weighted increased. R.C buildings are consisting of main loaded members. Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. If a research trend present in and outside the country is often seen, the structure measurement method of having used PZT and the optical fiber (FBG) will be the actual condition which has accomplished the stock. In order to manage such cracks, time, efforts and expense are required. Such a method has many difficulties in application of a structure by the difficult problem of the measurement range, and the expensive sensor price. Progressive cracks were generated by fracture of glass pipe sensor. Moreover, the experiment which can detect damage propriety by external Light Emitting Diode by damaging a glass pipe by load change with the application of switch using strain gage of a glass pipe was conducted.
김이성,윤승현,박강근,Kim, Ie-Sung,Yoon, Seoung-Hyun,Park, Kang-Geun 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.6
Today, many studies are progressed about source of vibration oscillator in reinforcement concrete structures. Source of vibration oscillator is load when it is happen from walking inhabitant. It is transmitted to another inhabitant through reinforcement concrete plate, and it is type of elastic wave. Those descriptions are ram wave and primary wave, secondary wave, and the are through the surface and inside plate. Analysis studies of those waves are used to piezoelectric materials. But, they are difficult to 3 axial type of transmitting elastic wave in concrete element. In this study, a fundamental study for source estimations of vibration oscillator using micro accelerometer are discussed. 철근 콘크리트 구조물에서 발생하는 진동 가진원과 영향에 대하여 많은 연구가 진행 중에 있다. 이러한 진동 가진원은 주로 거주자가 보행할 때 발생하는 하중이며, 발생한 가진원은 철근 콘크리트 판을 통하여 다른 거주자에게 전달된다. 이러한 전달원은 탄성파의 형태로 전달되는데 판의 표면으로 전달되는 표면파(Ram Wave)와 판의 내부로 전달되는 체적파(Prima Wave, Secondary Wave)의 형태로 전달된다 현재 이러한 파를 분석하는 연구는 압전소자(PZT)센서를 주로 사용하고 있으나, 콘크리트 부재에서 3축 형데로 전달되는 탄성파를 분석하기에는 여러 가지 어려운 부분이 많다. 따라서 이를 해결하기 위해 마이크로 가속도센서(Micro Accelerometer)를 이용하여 이동하중으로 발생하는 가진원에 대하여 평가하였다.
3축 가속도계를 이용한 철근 콘크리트 보에서의 손상평가
김이성,박강근,김태곤,김동혁,김화중,Kim, Ie-Sung,Park, Kang-Geun,Kim, Tae-Gon,Kim, Dong-Hyeok,Kim, Wha-Jung 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.6
철근 콘크리트 구조물에서 발생하는 균열에 의한 손상은 과도한 하중이나 사용성에 의해 발생한다. 이러한 손상을 검사하는 방법으로 육안으로 확인하거나 비파괴 시험법을 주로 이용하고 있다. 후자의 경우, 콘크리트 내부 철근의 배근 방향성에 의해 균열에 의한 손상인지 판별하기 어려운 문제가 발생하게 되며, 비파괴시험(Non-destructive Test)에 사용되는 대부분의 센서(Sensor)는 1축 가속도 센서이기 때문에 중첩된 전달파를 분석하기에는 어렵다. 따라서, 이를 해결하기 위해 중공 유리관을 이용하였고 콘크리트 보 내부에 매입하여 철근이 매입되어 있는 경우에 대하여 3축 가속도계를 이용하여 탄성파로 가진 하였을 경우에 발생하는 파(Wave)를 비교 분석하였다. The R.C Building will be superannuated as time passes by heavy load and serviceability. Methods of damage detection are used a visual angle of human or non-destructive test in the R.C Building. In case of the latter, Problems of damage detection are occurred to directions of steel bar. Elastic waves are difficult to assaying test using 1 axial type of accelerometer in reinforced concrete. In this study, fundamental studies for estimations using 3 axial type of accelerometer are discussed oscillator of elastic waves when embedded glass tube pipe or steel bar in flexible concrete specimens.
김이성(Kim Ie-Sung),김화중(Kim Wha-Jung) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.12
A various structural materials arc used in construction projects such as it stone, concrete, steel materials. Between of them, concrete are used widely. The compressive strength of concrete is high, and its maintenance and management is comparatively easy. The R.C Building will he superannuated as time passes. This program is generated by propagation of cracks. In order to manage such cracks, time and efforts, expense, etc. are required. In this study, glass sensors were embedding in a model beam and column and leakage of fluorescence and adhesive material was investigated. Further, currents in glass pipe were observed to find the leakage of liquid in glass pipes. Progressive cracks generated by cause the fracture of glass pipes. Therefore, the liquid become to flow and electric current stops, and the cracked part of the member can be found easily. Moreover, the adhesive delays progressive cracking system that responds in air, and the life of a structure can be made to extend. In a result of an experiment. When concretes were carrying out glass pipe tube, glass capsule, PVC tube, detection and a repair action of damage were able to be considered.<br/> The purpose of this research is to develop of low price sensors that can perform of self-diagnosis in addition to ability of concrete repair concrete to damage.
전기저항과 압전소자를 이용한 무선 손상자현 스마트 콘크리트의 개발
김이성(Kim Ie Sung),이수곤(Lee Soo-Gon),김화중(Kim Wha-Jung) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. Therefore, what the time for repairing the damage portion is understands importantly by such cracks. PZT and Electric Resistance are widely used to experiment in damage of element. If pressure is received, resistance and voltage will increase, and if tension is received resistance and voltage will decrease in Electric resistance and PZT. They are interested in the crack monitoring of structure using FM radio sensor and PZT sensor. In this study, the monitoring to a crack was studied using FM radio sensor and PZT sensor. Therefore, the purpose of this study is the fundamental research which detects damages of main members using the compound sensor which consisted of the radio sensors of resistance. PlT, and FM system.
김이성,박강근,김화중,Kim, Ie-Sung,Park, Kang-Geun,Kim, Wha-Jung 한국공간구조학회 2006 한국공간구조학회지 Vol.6 No.3
구조물의 모니터링과 손상 및 진동예측에 많은 센서들이 사용되고 있으며, 압전소자 및 변형게이지는 재료 및 구조물의 손상에 사용되고 있다. 그러나 진동에 대한 실험은 미진한 실정이다. 압전소자는 구조물의 변형되었을 때 로드셀의 경우에서처럼 작용되는 외력을 전기적인 신호로 바꾸어주는 센서이다. 이를 이용하여, 철근 콘크리트 판에서 진동예측을 압전소자의 전압변화로 사용하였다. 본 연구는 판에서 압전소자를 사용하여 진동을 예측하기 위한 기초적 연구이다. Various monitoring sensors have been used for the monitoring, damage and vibration prediction of structures. They have been used for sensing damage in a variety of materials and structures such as piezoelectric materials (PZT) and electric strain gauges. But, many experiments of vibration were not performed. The PZT changes physical force if load cell to electrical signal due to deformation of structure. The voltage change of piezoelectric sensors for plates are used for vibration prediction. In this study, a fundamental study for vibration prediction using piezoelectric sensors are discussed in plates.