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해저케이블 매설 보호공법에 대한 수치해석 기반 앵커 관입깊이 평가
장정범(Jung-Bum Jang),강하늘(Ha-Neul Kang),김정훈(Jeong-Hun Kim) 한국연안방재학회 2020 한국연안방재학회지 Vol.7 No.3
Submarine cables are installed and operated for the stable power supply of island regions, and feature protective measures to counter marine hazard factors. With regard to the protection techniques to prevent damage to submarine cables, the method of digging and embedding the submarine ground is applied the most. However, since there are no design criteria and techniques for such protection facilities, the burial depth of the submarine ground has been calculated only qualitatively and empirically after an ocean survey is conducted. Such an imperfect method has led to assorted damages to submarine cables. Therefore, in this study, to ensure the safety of submarine cables from marine hazard factors, the three-dimensional dynamic interaction analysis model was established for the ship anchor and ground, and the penetration depth of this anchor was calculated through numerical analysis for the burial protection method. These results were compared and evaluated with the results of the full scale test for anchoring and dragging anchor. As a result, the error rate(average) of the anchor penetration depth through the numerical analysis and test was 12.2% in the ground conditions of sand, clay and multi(clay/sand) layers. This error rate was analyzed to be caused by various uncertainties in the test, such as the dynamic impact of the anchor and ground conditions, and the numerical analysis was evaluated to ensure sufficient reliability. The results of this study are expected to be useful in the burial depth calculation of the burial protection method to ensure the safety of submarine cables.
변형률과 응력파속도를 이용한 부착식 텐던의 긴장력 평가
장정범(Jang Jung Bum),황경민(Hwang Kyeong Min),이홍표(Lee Hong Pyo),김병화(Kim Byeong Hwa) 대한토목학회 2012 대한토목학회논문집 A Vol.32 No.3A
국내 일부 가동 중 원전의 원자로건물에 부착식 텐던이 시공되어 있고, 이들에 대한 긴장력 평가는 원자로건물의 구조 건전성 평가 시 매우 중요하다. 따라서, 본 논문에서는 기존의 간접적인 부착식 텐던의 긴장력 평가방법을 개선하기 위하여 개발된 SI 기술과 충격신호 분석기술을 이용하여 실제 원자로건물에 매입된 부착식 텐던을 대상으로 긴장력을 평가하였다. 이를 위해 원자로건물에서 발생하는 변형률과 부착식 텐던에서 발생하는 응력파속도를 계측하였다. 이들을 통해 부착식 텐던의 긴장력을 평가한 결과, SI 기술과 충격신호 분석기술 모두 높은 신뢰성 있는 결과를 제시하였고, 기존의 이론적인 접근 방법에 의한 결과와도 매우 유사한 경향을 제시함으로써 본 연구진에서 개발한 부착식 텐던의 긴장력 평가방법이 매우 유용함을 확인할 수 있었다. The bonded tendon was adopted to the reactor containment building of some operating nuclear power plants in Korea and the assessment of the prestress force on the bonded tendon is very important for the evaluation of the structural integrity. The prestress force of the bonded tendon at real reactor containment building, was evaluated using the SI technique and impact signal analysis technique which were developed to improve the existing indirect assessmment technique. For these techniques, the strain of the reactor containment building and the stress wave velocity of the bonded tendon were measured. Both SI technique and impact signal analysis technique give the highly reliable results comparison with the existing theoretical approach. Therefore, it is confirmed that the developed techniques are very useful for the evaluation of the prestress force on the bonded tendon.
부착식 텐던의 유효 긴장력 평가를 위한 최적의 매개변수 결정에 관한 연구
장정범(Jang Jung Bum),이홍표(Lee Hong Pyo),황경민(Hwang Kyeong Min),송영철(Song Young Chul) 대한토목학회 2010 대한토목학회논문집 A Vol.30 No.2A
국내 가동 중 일부 원전의 원자로건물에 부착식 텐던이 설치되어 있고, 부착식 텐던에 대한 유효 긴장력 평가는 이들 원전의 계속운전을 위한 주요 현안으로 부각되고 있다. 따라서, 본 연구에서는 System Identification 기법을 이용한 부착식 텐던의 유효 긴장력 평가를 위하여, SI 기법에 유효한 주요 매개변수의 영향 평가를 수행하고 최적의 매개변수를 도출하였다. 본 연구를 위하여, 원자로건물 벽체의 1/5 축소모형 시험체를 제작하였고, 유효 긴장력과 고유진동수 및 변위와의 상관성을 분석하기 위하여 Impact test, SIMO sine sweep test 및 광섬유센서와 변위계에 의한 휨시험을 수행하였다. 시험결과, 고유진동수와 변위 모두 유효 긴장력과 좋은 상관성을 지니는 것으로 나타나, 이들 매개변수 모두 SI 기법의 입력자료로 활용되어 부착식 텐던의 유효 긴장력 예측이 가능한 것으로 분석되었다. The bonded tendon was adopted to the reactor building of some operating nuclear power plants in Korea and the assessment of the effective prestress force on the bonded tendon is being issued as an important pending problem for continuous operation beyond their design life. The sensitivity analysis of various parameters was carried out to evaluate the effective prestress force using the system identification technique and the optimal parameters were determined for SI technique in this study. The 1/5 scaled post-tensioned concrete beams with the bonded tendon type were manufactured and in order to investigate the relationship of the natural frequency and the displacement to the effective prestress force, impact test, SIMO sine sweep test and bending test using the optical fiber sensor and the compact displacement transducer were carried out. As a result of tests, both the natural frequency and the displacement show the good relationship with the effective prestress force and both parameters are available for the SI technique to estimate the effective prestress force.