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뒤채움재의 물성과 지반의 강성에 따른 석축 문화재의 구조 안정성 평가 연구
이가윤,이성민,김재영,이기학,Lee, Ga-Yoon,Lee, Sung-Min,Kim, Jae Young,Lee, Kihak 한국공간구조학회 2024 한국공간구조학회지 Vol.24 No.2
The cultural heritage of fortresses is often exposed to external elements, leading to significant damage from stone weathering and natural disasters. However, due to the nature of cultural heritage, dismantling and restoration are often impractical. Therefore, the stability of fortress cultural heritage was evaluated through non-destructive testing. The durability of masonry cultural heritages is greatly influenced by the physical characteristics of the back-fille material. Dynamic characteristics were assessed, and endoscopy was used to inspect internal fillings. Additionally, a finite element analysis model was developed considering the surrounding ground through elastic wave exploration. The analysis showed that the loss of internal fillings in the target cultural heritage site could lead to further deformation in the future, emphasizing the need for careful observation.
이가윤,이성민,김시윤,이기학,Lee, Ga-Yoon,Lee, Sung-Min,Kim, Si-Yun,Lee, Kihak 한국공간구조학회 2019 한국공간구조학회지 Vol.19 No.1
Yangjindang house, which is located in Sang-ju province of South Korea, is one of the special Hanok structures dated back to Joseon dynasty. This study aims to examine structural safety of the Yangjindang wood frame building considering dynamic parameters such as the natural frequency and damping ratio. The numerical model of the wood frame building is implemented using Midas Gen, especially the wood joint where column and beam were connected. The behavior of the actual frame building was compared with the modeling results. In addition, structure responses such as shear force, axial force, flexural moment and deflections were calculated and compared with the allowable limits. Numerical results show that, generally, despite of some local members shear failure, Yangjindang's structural response does not exceed the limitation according to current standards.
보수전과 후의 홍예교의 동적특성과 구조성능에 대한 해석연구
이가윤,이성민,이기학,Lee, Ga-Yoon,Lee, Sung-Min,Lee, Kihak 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.4
This study evaluates safety assessment before and after repair of Seonamsa temple seungseon bridge, which refer to the representative Hongye bridge in Korea. In this approach natural frequency of the structure were considered in the modeling procedure. Trial & error method is applied to obtain the approximate natural frequency before and after retrofit construction. Stiffness of the actual structure was examined to account for the dynamic characteristics of Hongye bridge measured in the field and adjusting parameters in computer modeling. The safety and usability of the stone structure in terms of load bearing capacity and displacement were examined.
하이브리드 슈퍼코팅(HSC)과 유리섬유를 통한 조적조 내진보강 연구
이가윤,문아해,이승준,김재현,이기학,Lee, Ga Yoon,Moon, A hea,Lee, Seung Jun,Kim, Jae Hyun,Lee, Kihak 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.5
Many Korean domestic masonry structures constructed since 1970 have been found to be vulnerable to earthquakes because they lack efficient lateral force resistance. Many studies have shown that the brick and mortar suddenly experience brittle fracture and out-of-plane collapse when they reach the inelastic range. This study evaluated the seismic retrofitting of non-reinforced masonry with Hybrid Super Coating (HSC) and Cast, manufactured using glass fiber. Four types of specimen original specimen (BR-OR), one layered HSC (BR-HS-O), two-layered HSC (BR-HS-B), one layered HSC, and Cast (BR-CT-HS-O) were constructed and analyzed using compression, flexural tensile, diagonal compression, and triplet tests. The specimen responses were presented and discussed in load-displacement curves, maximum strength, and crack propagation. The compressive strength of the retrofit specimens slightly increased, while the flexural tensile strength of the retrofit specimens increased significantly. In addition, the HSC and Cast also produced a considerable increase in the ductile response of specimens before failure. Diagonal compression test results showed that HSC delayed brittle cracks between the mortar and bricks and resulted in larger displacement before failure than the original brick. The triplet test results confirmed that the bonding strength of the retrofit specimens also increased. The application of HSC and Cast was found to restrain the occurrence of brittle failure effectively and delayed the collapse of masonry wall structures.
유한요소해석을 통한 송산리고분군 무령왕릉의 구조안전성 평가
이가윤,조영훈,이성민,이찬희,이기학,Lee, Ga-Yoon,Jo, Young Hoon,Lee, Sung-Min,Lee, Chan Hee,Lee, Kihak 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.3
Tomb of King Muryeong, located in Sonsan-ri, was found vulnerable due to leakages during since the summer of 2016. This research aims to evaluate structural safety of the Tomb under the tumulus. Site surveys were conducted to find vulnerable inner parts. Structural safety assessment is presented based on both site survey results and analytical results obtained through FEM analysis using the ANSYS program. The underground structure was explicitly modeled to focus on two types of loadings: design loads and actual gravity loads. In general, the tomb does not show any critical deflection increase or damage through the analytical investigation. However, maintenance through continuous monitoring is necessary to prevent severe deflections and stress concentrations since the rigidity of the tomb materials are very vulnerable and likely to be reduced due to prolonged weathering and continuous rain leakage.
우리나라 전통 점토벽돌과 석회모르타르를 사용한 조적조의 실험적 연구
이가윤(Lee, Ga Yoon),이기학(Lee, Kihak) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 2종류의 점토벽돌과 3종류의 석회모르타르의 재료적 특징을 조사하였다. 실험결과 공장제 벽돌로 만들어진 조적실험체에서 높은 압축강도를 나타내었고, 전단강도, 사인장강도는 수제 전돌에서 높은 강도를 나타냈다. 이는 벽돌과 모르타르의 접착력이 모르타르의 강도보다 더 큰 영향을 미치는 것으로 판단된다. This study investigates the material characteristics of two types of Korean traditional bricks and three types of lime mortars. Factory-made bricks perform high compression strength of prism, and the strength of the triplet shear and diagonal compression tests is good in specimens with hand-made bricks. Test results indicate that the adhesion between brick and mortar have a greater effect than the strength of mortar.