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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.
허광희(Heo, Gwanghee),김영범(Kim, Youngbeom),서상구(Seo, Sanggu),전승곤(Jeon, Seunggon),이재훈(Lee, Jaehoon),김대혁(Kim, Daehyuck) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.4
본 연구는 공동주택에서 화재 발생 시 거주자의 신속한 피난을 유도하여 인명 및 재산 피해를 저감하는 스마트 피난 시스템을 개발하였다. 스마트 피난 시스템은 피난시설에 적재될 수 있는 적재물을 상시 검출하여 안전하게 대피를 할 수 있는 환경과 물리적으로 최상의 대피 여건을 제공한다. 또한, 화재 시 거주자와 관리자에게 신속하게 화재정보를 자동으로 전파하여 초동대피를 유도하고, 119 상황실로 보고하여 화재를 조기에 진압할 수 있는 기능을 제공한다. 스마트 피난 시스템은 피난에 사용되는 안전사다리와 피난대피처의 방해물을 검출하는 이상물 검출시스템, 그리고 거주자와 관리자뿐만 아니라 119에 신속하게 화재정보를 알리는 통신시스템으로 구성되어있다. 안전사다리의 효과적인 성능을 검증하기 위해서 제안한 실물 크기의 안전사다리를 제작하여 구조적인 성능과 신속한 사용성을 검증하였다. 또한, 피난대피처의 공간을 상시 확보하기 위해서 피난대피처에 비접촉센서와 통신 모듈을 사용하여 실시간으로 정확하게 피난 방해물을 이상물로 검출하는지의 가능성을 확인하였다. 마지막으로 화재 시 거주자와 관리자에게 신속하게 화재정보를 송신하며 대피를 돕고 신속한 화재진압을 위해서 화재정보를 119에 신고하는 기능을 검증하였다. 이 결과 본 스마트 피난 시스템은 화재 시 신속 정확한 정보제공으로 안전하면서도 효과적인 대피를 유도하며, 화재진압 시 초동대응에 매우 유용한 시스템임을 입증하였다. A smart evacuation system is developed herein to reduce damage to lives and property by inducing rapid evacuation of the residents in the event of apartment fires. The smart evacuation system provides a safe evacuation environment and the best physical evacuation conditions by detecting the loads to be applied to evacuation facilities at all times. In addition, fire information is automatically disseminated to the residents and managers during a fire for initial evacuation, and the function for early fire extinguishing is enabled via report to the 119 situation room. The smart evacuation system comprises a safety ladder for evacuation, an ideal detection system to detect obstructions in the evacuation facilities, and a communication system to quickly inform authorities, residents, and managers of a fire. To verify effective performance of the safety ladder, real safety ladders were constructed and their structural performance and usability were verified. In addition, to ensure their permanent space in evacuation facilities, we verified that obstructions to evacuation were accurately detected as anomalies in real time using contactless sensors and communication modules. Finally, the fire information was sent to residents and managers in case of a fire to assist evacuation as well as reported to 119 for rapid suppression. Thus, we demonstrate that the smart evacuation system allows safe and effective evacuation with fast and accurate information in the event of a fire and is useful for initial response for fire suppression.
다경간 교량의 충돌 제어를 위한 개선된 SMC 알고리즘의 성능 평가
허광희 ( Heo Gwanghee ),김충길 ( Kim Chunggil ),이진옥 ( Lee Chinok ),서상구 ( Seo Sanggu ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
This paper aims to developed SMC-Fractional algorithm, that is, enhances the performance of Sliding Mode Control(SMC) algorithm for pounding control of Multi-span bridges using MR-damper. The pounding control performance of SMC-Fractional algorithm has been evaluated in shaking table test on multi-span bridge. As a result of the experiment, the SMC-Fractional algorithm showed the performance od reducing the relative displacement of adjacent spans over other algorithms.
허열(Heo Yol),송석철(Song Seokcheol),안광국(Ahn Kwangkuk),오승탁(Oh Seungtak),서상구(Seo Sanggu) 한국지반환경공학회 2008 한국지반환경공학회논문집 Vol.9 No.7
본 연구에서는 모래다짐말뚝으로 개량된 점성토 지반에 고성토시 발생될 수 있는 측방유동과 교대의 안정성을 파악하기 위하여 원심모형실험과 수치해석을 수행하였다.원심모형실험과 수치해석은 교대 배면구간을EPS로 성토한 경우(Case 1)와 토사로 성토한 경우(Case 2)에 대하여 수행하였으며, 모형실험시 교대와 성토체에 potentiometer를 설치하여 교대상부의 수직변위와 수평변위 및 성토체의 수직변위를 측정하였다.원심모형실험결과Case 1에서 교대의 수평변위는 1.4cm 정도로 해석결과와 거의 일치하며, 허용기준을 만족하는 것으로 나타났다. 반면, Case 2에서 교대의 수평변위는 12cm 정도로 해석결과에 비해 18% 정도 크게 평가되었으며, 허용기준을 초과하는 것으로 나타났다. 해석결과 Case 1에서 말뚝의 최대수평변위는 1.26cm로 허용 수평변위 기준(1.5cm)을 만족하는 것으로 나타난 반면, Case 2에서 말뚝의 최대 수평변위는 1.005m로 허용기준을 크게 초과하는 것으로 나타났다. In this study, the centrifuge tests and numerical analyses were performed to investigate the lateral flow behavior and stability of abutment when high filling was applied on the soft ground improved by SCP. The centrifuge model tests and numerical analyses were fulfilled in the case of the back of abutment filled by EPS (case 1) and soil (case 2), and the potentiometer was installed on the abutment and fill to measure the vertical and horizontal displacement at the top of abutment. As a result of the centrifugal tests, the horizontal displacement of abutment in the case 1 was 1.4cm that is almost coincide with the results of numerical and satisfy the allowable standard. On the other hand, the horizontal displacement of abutment in the case 2 was 12 cm that is 18% greater than that of numerical analysis and exceed the allowable standard. As a result of analysis, the maximum horizontal displacement of pile was 1.26 cm in case 1 that satisfies the criterion of allowable horizontal displacement (1.5 cm). In contrast, the maximum horizontal displacement of pile was 1.005 m in case 2 that greatly exceeds the allowable horizontal displacement.