힌지식 펌프 일체형 수문 고정장치의 안전성 평가

방건혁(GeonHyeok Bang),이재훈(Jaehoon Lee),허광희(Gwanghee Heo),서상구(Sang Gu Seo),전승곤(Seunggon Jeon) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.4

우리나라같이 산지가 많은 경우, 소규모 저류시설이 많아지며, 저류시설에서 이용되는 수문의 개폐장치의 안전성은 매우 중요하다. 최근 유압을 이용한 수문의 개폐장지는 개폐과정에서 시간이 지남에 따라서 유압의 손실로 자중으로 인한 처짐이발생을 하게 되는데, 이와 같은 수문의 처짐 문제를 해결하기 위하여 유압손실 방지용 고정장치를 사용하게 된다. 본 연구는 수문의 고정장치의 안전성을 이론과 수치적인 검토를 통하여 적정한 수문의 안전설계를 유도하고자 한다. 우선, 이론적으로수문 고정장치의 안정성을 확보하기 위해서 고정장치의 단면 높이를 고려한 단면환산을 통하여 고정장치를 단순화하여해석을 하였다. 그리고 단순화된 고정장치는 연결 형태에 따라 지점 조건들을 가정하고, 고정장치에 작용하는 하중을 조건으로단면환산이 고려된 고정장치에서 발생하는 최대처짐을 계산하였다. 이와 같은 구조해석을 통하여 최대 처짐 문제와 고정장치에서 발생하는 응력을 확인하고 그에 대한 안전성을 판단하여 고정장치의 안전기준을 제시하였다. 비교검증을 위하여 수행한 FE 수치해석은 고정장치는 등질등방성의 선형탄성의 조건으로 해석하였다. 이 결과 펌프식 수문의 고정장치의 안전성 확보를위한 이론적, 수치적인 검증을 통하여 펌프식 수문 고정창치의 안전설계 방법을 제시하였다. In several mountainous areas in Korea, the number of small-scale storage facilities are on the rise. The safety of the opening and closing devices of sluice gates used in storage facilities is important. Recently, during the opening and closing of a water gate that used hydraulic pressure, sagging had occurred owing to the loss of hydraulic pressure over time. To solve the sagging problem of the water gate, a hydraulic loss prevention fixing device is used. The purpose of this study is to induce the safety design of a water gate through a theoretical and numerical review of the safety of a fixing device of the water gate. First, to theoretically secure the stability of the water gate fixing device, the fixing device was simplified and analyzed using the transformed-section method considering its cross-sectional height. In addition, the simplified fixing device assumed the point conditions according to the connection type, and the maximum deflection occurring in the fixing device was calculated considering the cross section conversion under the condition of the load acting on it. Through this structural analysis, the maximum deflection problem and stress generated in the fixing device were confirmed, and the safety of the fixing device was assessed to present its safety standard. The FE numerical analysis performed for comparative verification was interpreted as a condition of linear elasticity of isotropy in the fixing device. Consequently, a safety design method for the pump-type water gate fixing device was presented through the theoretical and numerical verification for securing its safety.

개선된 영향계수를 이용한 차량의 하중과 응답 응력 관계 검증

방건혁(Bang, GeonHyeok),허광희(Heo, GwangHee),이재훈(Lee, JaeHoon),전승곤(Jeon, SeungGon),이유재(Lee, Yujae),최범균(Choi, BeomGyun) 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10

저층수 배수를 위한 가동보의 안전성 평가

이재훈(Jaehoon Lee),방건혁(GeonHyeok Bang),허광희(Gwanghee Heo),최범균(Beom Gyun Choi),이유재(Yujae Lee) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.4

한국의 지형은 산지 면적이 국토의 70%를 차지하고 있다. 이러한 특징을 고려한 수자원 확보 방안은 가동보를 이용한 소규모 저류지를 활용하는 것이다. 본 연구에서는 저류지의 저층에서 물을 배출할 수 있는 가동보를 개발하고자 한다, 저층으로물을 배출할 수 있는 가동보의 구조적인 안전성을 평가하기 위해서 수치적인 해석(FEM 해석)과 이론적인 해석을 병행하여상호의 결과값을 비교 분석함으로써 가동보의 안전성을 평가하였다. 본 연구에 사용한 가동보는 수문 본체와 하단배출 수문으로분류하여 해석되었다. 먼저 수문본체와 하단 배출수문을 단순화 하여 진행하고 응력, 처짐, 비틀림 등을 계산하여 안전성평가를 수행하였다. 단순화 작업이 완료된 수문본체와 하단 배출수문을 대상으로 기립각의 요소에 변수를 적용해서 FEM 해석을 진행하여 인장, 압축, 전단응력을 계산하였다. 수문본체의 경우에 기립각의 변수를 30°, 60°, 64°로 분류해서 해석을하였다. 하단 배출수문의 경우에는 회동링크 축의 변수를 두께가 20 mm, 22 mm, 24 mm, 26 mm로 분류해서 해석하였다.저층수 배출이 가능한 가동보를 수분 본체와 하단배출 수문으로 분류하여 안전성을 분석한 결과, 주어진 조건의 가동보를구성하는 요소들이 허용응력을 초과하지 않았으므로 구조적으로 안전한 요소임을 확인하였며, 설계한 가동보가 설계 수위에따른 수압을 지탱하도록 구조적으로 안전하게 설계되었음을 확인하였다. Korea topography accounts for 70% of the country's land area. A plan to secure water resources considering this characteristic is to utilize small-scale reservoirs using movable weirs. In this study, we aim to develop a movable weir that can discharge water from the bottom of the reservoir and evaluate the structural safety of the movable weir that can discharge water to the bottom layer; the safety of the movable weir is evaluated by comparing and analyzing the results of each other. The movable information used in this study was classified into two types (water body and bottom discharge sluice gate) according to usability and the installation location. First, the design of the hydrological body and lower discharge hydrological gate were simplified, and the simplification was evaluated by calculating stress, sagging, and twisting. Tensile, compression, and shear stresses were calculated by conducting FEM analysis by applying variables to the elements of the standing angle to the hydrological body and lower discharge hydrological gate where the simplification work was completed. In the case of the hydrological body, the variables of the standing angle were classified into and analyzed. In the case of the lower discharge hydrological gate, the variables of the rotating link axis were classified into 20 mm, 22 mm, 24 mm, and 26 mm in thickness and analyzed. Determining safety by classifying mobile beams capable of discharging low-rise water into moisture bodies and lower discharge sluices confirmed that the components of mobile beams under a given condition did not exceed allowable stress.

통계적 패턴 인식 기술을 이용한 교량의 실시간 손상평가 기술 개발

허광희 ( Heo Gwanghee ),김충길 ( Kim Chunggil ),방건혁 ( Bang Geonhyeok ),김용석 ( Kim Yongsuk ),고병찬 ( Ko Byeongchan ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2

In this paper, real-time damage assessment technology was developed for detection the damage of bridges in real time and the performance of the developed technology was verified by vibration test. Real-time damage assessment technology was developed by combining statistical pattern recognition technology and simulation technology. In order to verify the developed technology, the earthquake response acquisition experiment was conducted according to the cable damage of the model cable-stayed bridge. As a result, it was confirmed that the developed real-time damage assessment technology can provide information on the location of damaged cable.

유압댐퍼를 이용한 적재설비의 내진 성능 향상

허광희 ( Heo Gwanghee ),김충길 ( Kim Chunggil ),방건혁 ( Bang Geonhyeok ),이진옥 ( Lee Chinok ),박채린 ( Park Chaerin ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2

In this paper, a hydraulic damper was developed to protect the storage racks from earthquakes and the seismic performance of the storage racks was improved by applying the developed damper. In order to achieve these goals, the control capacity for the safety of the storage racks was determined, and a hydraulic damper satisfying the control capacity was designed and manufactured. In addition, the location of the hydraulic damper was determined through simulation. Finally, the shaking table test was carried out. As a result, the seismic performance improvement of the storage racks using the hydraulic damper was confirmed.

강관 추진마찰저항력 산정 기법 연구

정유승(Yuseung Jeoung),허광희(Gwanghee Heo),서상구(Sanggu Seo),전승곤(Seunggon Jeon),방건혁(Geonhyeok Bang),이재훈(Jaehoon Lee) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.3

This study calculated the steel pipe propulsion friction force required for tunnel excavation. To experimentally estimate the frictional resistance of a steel pipe, a model soil tank was constructed, and the steel pipe propulsion test was conducted under the condition of applying the earth pressure calculated from the field data. To analyze the effect of the earth pressure when the steel pipe was inserted, the section where the load was most generated was selected and a numerical analysis was performed. In the numerical analysis, the shear force was assumed to uniformly act on the entire steel pipe, and consequently, the resistance owing to the overburden load uniformly acted on the entire section. For the model steel pipe, the cross section and thickness of the steel pipe were maintained in a ratio of 1:4 to the actual size according to the law of similarity to which the scale factor was applied for the steel pipe penetration simulation. In the steel pipe propulsion experiment, the frictional resistance of the steel pipe was estimated using the soil analysis of the stratum based on the drilling result of the steel pipe penetration section and using it as the load condition. From the data obtained in the experiment, the frictional resistance trend line according to the overburden load was determined, and the frictional resistance of the steel pipe was calculated using this trend line. Based on these data, the intrusion simulation of the propulsion pipe was performed, and the estimated resistance was compared with the theoretically calculated resistance. Consequently, the error rate was less than 5%, and the proper steel pipe propulsion friction force was derived.