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강판 콘크리트 구조 접합부의 설계방식에 따른 검증실험 연구
황경민,이경진,양현정,김원기,Hwang, Kyeong Min,Lee, Kyung Jin,Yang, Hyun Jung,Kim, Won Ki 한국강구조학회 2014 韓國鋼構造學會 論文集 Vol.26 No.1
본 연구에서는 원전 구조물 내 철근 콘크리트 구조와 강판 콘크리트 구조가 이질접합된 경우를 모사하기 위하여, 상하부 표면강판 간에 타이바를, 상하부 리브재 간에 타이형강을 구성한 보형 실험체를 제작하여 실험체의 면외 휨 거동특성을 확인하고자 하였다. 실험결과, 실험체의 연성거동을 검증하였으며, 타이바와 타이형강이 콘크리트 및 강판의 분리를 방지함으로써 접합부의 취성파괴를 막아주고 있음을 확인하였다. 또한, #14 주철근으로 구성한 강판 콘크리트 구조 접합부에 대하여 두 가지 형태의 기계적 정착이음 방식에 따른 인장실험을 수행함으로써 본 방식의 설계 적정성을 평가하였다. 실험결과, 두 실험체 모두 주철근이 항복에 도달할 때까지 철근의 정착 및 연결 기능을 탄성한도 내에서 건전히 수행하고 있음을 확인하였다. In this study, out-of-plane flexural test was performed to analyze behavior properties for a beam specimen which imitated a structure with connection member between reinforced concrete and steel plate concrete part. Tie bars between a upper and a lower steel plate, and tie wide flange shapes between upper and lower ribs were designed to prevent the steel plate or the ribs from breakaway in the connection of the specimen. As a result of the test, ductile failure behavior of the specimen and the functionality of the tie members were conformed as originally intended. Also, tension tests were performed to evaluate the design appropriateness of two specimens produced to anchor and connect mechanically #14 bars. The two test results showed that the anchorage connection system behaves in elastic limit during the main bars yielded, and the integrity of the designed system was verified.
황경민,전낙현,정길영,박경성,Hwang, Kyeong-min,Chun, Nak-hyun,Chung, Gil-young,Park, Kyung-sung 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.4
In this paper, the seismic performance evaluation was performed on 100 existing open-cut power cable tunnels, including ones that did not consider seismic design, in order to verify that the government's demand level (seismic special grade, 0.22 g). The results of the seismic performance evaluation show that most of the tunnels have seismic performance of 0.3 to 1 g, satisfying the level of the seismic special grade and securing the seismic safety. Meanwhile, the earthquake response analysis and structural test were performed to verify the validity of the method and the results of the seismic performance evaluation of the tunnels by the response displacement method, and to verify their seismic safety. As a result, the relative displacement due to the response displacement method under the 0.22 g earthquake was conservative than the results of the earthquake response analysis, and the results of load-displacement curves and response modification coefficient calculation by real scale structural tests showed the safety of the tunnels. 본 논문에서는 내진설계가 고려되어 있지 않은 전력구를 포함한 기설 개착식 전력구 100개소를 대상으로, 정부의 요구수준(내진 특등급, 0.22 g)을 만족하는지 확인하기 위하여 내진성능 평가를 수행하였다. 내진성능 평가 결과, 대상 전력구들은 대부분 0.3-1 g의 내진성능을 보유하고 있는 것으로 나타나, 내진 특등급 수준을 만족하였으며 내진안전성을 확보하고 있는 것으로 나타났다. 한편 응답변위법에 의한 전력구의 내진성능 평가 방법 및 결과에 대한 타당성을 확인하고, 전력구의 내진 안전성을 검증하기 위한 지진응답 해석 및 구조실험을 수행하였다. 그 결과 0.22 g 수준의 지진 하에서 응답변위법에 의한 상대변위는 지진응답 해석 결과보다 보수적이었으며, 실규모 구조실험에 의한 하중-변위 곡선 및 응답수정계수 산정 결과를 통해 전력구의 내진 안전성을 확인할 수 있었다.
송전철탑의 내진성능평가 및 설계 풍하중과 지진하중의 비교 연구
황경민,전낙현,장정범,연관희,김태균,Hwang, Kyeong-min,Chun, Nak-hyun,Jang, Jung-bum,Yun, Kwan-hee,Kim, Tae-kyun 한국전력공사 2019 KEPCO Journal on electric power and energy Vol.5 No.2
본 연구에서는 최근 정부에서 제시한 표준설계 응답스펙트럼을 이용하여 송전용량, 높이 및 구조타입 등 다양한 변수를 고려한 송전철탑 24기를 선정하여 내진성능평가를 수행하였다. 또한, 정부에서 요구한 내진기준 상향 시 철탑의 설계에 미치는 영향을 검토하기 위하여, 현 설계 풍하중 및 개정 지진하중에 의해 발생되는 응력 및 단면력의 크기를 비교해 보았다. 내진성능평가 결과 대상 철탑들은 0.31~0.91g의 내진성능을 보유하고 있는 것으로 나타나, 2,400년 재현주기의 내진특등급 수준을 만족하였으며 내진안전성을 확보하고 있는 것으로 나타났다. 또한, 철탑의 지진에 의한 단면력은 풍하중에 의한 값의 33~82.5%로 나타나, 상향된 내진기준에서도 설계 풍하중이 지진하중보다 지배적임을 확인하였다. In this study 24 power transmission towers were selected by considering various variables such as power transmission capacity, height and structural type to evaluate their seismic performance using the standard design response spectrum recently announced by the government. In addition, the stresses and sectional forces generated by the current design wind loads and revised seismic ones were compared to review the effects on the design of power transmission towers when the government-required seismic standards were raised. The results of seismic performance evaluation for the target power transmission towers showed that they had seismic capacity of 0.31~0.91g, and that they met the level of the earthquake-resistant special grade, which is the 2,400-year earthquake return periods and secured seismic safety. Further, the sectional forces caused by earthquakes in the towers were 33~82.5% of the ones due to wind loads, and it was also confirmed that the design wind loads were more dominant than design earthquake ones under the elevated seismic standards.
철근 콘크리트 벽과 강판 콘크리트 벽이 수직으로 만나는 이질접합 구조물의 면외 휨 거동 특성 연구
황경민,이경진,함경원,김원기,Hwang, Kyeong Min,Lee, Kyung Jin,Hahm, Kyung Won,Kim, Won Ki 한국강구조학회 2013 韓國鋼構造學會 論文集 Vol.25 No.1
본 연구에서는 철근콘크리트 벽과 강판 콘크리트 벽이 서로 수직면의 이질접합 형태로 만나는 벽의 면외 휨 거동 특성을 검토하기 위하여, L형 실험체를 제작하고 휨 실험을 수행하였다. 실험 시, 실험체의 동적특성을 확인하기 위하여 Push 및 Pull 하중을 반복하는 싸이클 하중을 구현하고자 하였다. Push 하중에 의한 실험 결과, 실험체의 공칭강도를 초과하는 휨 성능을 발휘하였으며, 이에 따라 설계에 적용된 수직철근의 미겹침 이음길이의 타당성을 확인할 수 있었다. 한편, Pull 하중 가력 시에는 수직철근이 최대 내력을 발휘하기 전에 접합부 콘크리트에서 전단 파괴 거동이 나타나, 이에 대한 보강이 필요함을 확인하였다. This paper describes the experimental study on the structural behavior of the vertical plane connection between a reinforced concrete wall and a steel plate concrete wall under out-of-plane flexural loads. The specimen was tested under a dynamic test with the use of cyclic loads. As a result of the test, ductile failure mode of vertical bars was shown under a push load and the failure load was more than that of the nominal strength of the specimen. However, the shear failure mode of the connection was confirmed in case of a pull test and thus demonstrates a need for a shear reinforcement.
황경민 ( Hwang Kyeong-min ),장정범 ( Jang Jung-bum ),김경열 ( Kim Kyoung-yul ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
As the law for measurers against earthquake disasters take effect on recently, seismic countermeasures for public facilities become the center of main interest. Especially, operating transformers in the substations are so important equipment that play a pivotal role in supplying electric power, and their seismic design is essential. When seismic design for the transformers is conducted, it is considered that the various factors affecting their anchorage such as diameter of an anchor bolt, space between anchor bolts, distance from concrete edge to an anchor bolt, etc. So, the greatest concern of designers how to reinforce these optimally by considering simultaneously seismic safety and construction. Thus in this study, the factors affecting seismic design of anchorage for 154kV main transformers were analyzed using 6-sigma statistical technique and then an optimal design plan was decided.
25.8kV GIS의 내진성능을 고려한 용접기초부의 최적설계에 관한 연구
황경민 ( Hwang Kyeong-min ),장정범 ( Jang Jung-bum ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
Recent strong earthquakes occurring throughout the world cause social and economic unrest, and they become the center of public interest in the Korean Peninsula. So, the law for measurers against earthquake disasters take effect on recently to require a seismic countermeasure for public facilities and infrastructures. Especially, equipment in the substations are so important facilities that play a pivotal role in supplying electric power, and their seismic design is essential. So, it is important that the factors affecting seismic capability of these equipment are investigated and an optimal plan of seismic design is drawn up. Thus in this study, the factors affecting seismic capability of 25.8kV GIS as a representative substation equipment were analyzed using 6-sigma statistical technique and then an optimal design plan was decided.
전력설비의 내진성능을 고려한 벨로우즈의 위치 결정에 관한 연구
황경민 ( Hwang Kyeong-min ),장정범 ( Jang Jung-bum ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
GIS(Gas Insulated Switchgear) system has been established recently to minimize site area needed for constructing substations. It is a structure which is composed of long line type because it includes many substation equipment and this is connected to GIB(Gas Insulated Bus) of pipe type. So, a few bellows are established at some places of the GIS facilities to permit longitudinal displacement due to thermal stress when they are designed. And it is judged that installation location of the bellows affect behavior of the whole GIS system because amplified acceleration occurs at the system under seismic loads by being established at high location from ground. Thus, in order to select optimal location of the bellows, sensitivity analysis is carried out for GIS whose importance is getting greater gradually as substation facilities.