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초음파 속도법 및 반발경도법을 이용한 콘크리트 모의부재 압축강도 추정에 관한 연구
홍성욱,조영상,Hong, Seong-Uk,Cho, Young-Sang 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1
As infrastructures are being deteriorated, nondestructive evaluation of existing structures and construction quality control are increasingly demanded in the construction industry. The importance of predicting compressive strength of concrete structure is also gradually increasing in construction industry. The estimation of concrete compressive strength is a critical factor of the construction management and quality control. This study has been conducted using Ultrasonic pulse velocity method and Rebound hardness method, which are nondestructive test methods for the estimation of the concrete compressive strength. The method for predicting the strength and the position of rebars of reinforced concrete slabs and detecting void of reinforced concrete slab are derived from the relationship between compressive strength and stress wave velocity. It is focusing to examine the relationship among compressive strength of concrete, Ultrasonic pulse velocity method and result by rebound number by Schmidt hammer test.
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용접구조용 고강도강재의 피로균열성장특성에 관한 실험적 연구
홍성욱,경갑수,남왕현,정영화,Hong, Sung Wook,Kyung, Kab Soo,Nam, Wang Hyun,Jung, Young Hwa 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.6
In this study, a series of fatigue tests are performed in order to estimate quantitatively the characteristics of fatigue crack growth rate according to the base metal, heat affected zone(HAZ) and weld metal, and the welding method and grade of strength of object steels, and the influence on fatigue crack growth rate according to the direction of welded line for high strength steels of SM570, POSTEN60, and POSTEN80 steels. From the fatigue test results, the retardations of fatigue crack growth rate are remarkable in case that the direction of notch is parallel to welded line than in case that the direction of notch is perpendicular to welded line because of compresive residual stress in weld metal & HAZ. And the characteristics of fatigue crack growth rate according to welding method are that the dispersion of fatigue crack growth rate in case of FCAW method is smaller than that of SAW method. Also, it knows that the fatigue crack growth rate converges in high stress intensity factor range. Meanwhile, fatigue safety is guaranteed sufficiently in the object steels because the fatigue crack growth rate in the range of fatigue crack propagation has a similar tendency to the test results & existing results. 본 연구에서는 향후 사용빈도가 증가할 것으로 예상되는 SM570, POSTEN60 및 POSTEN80 강재를 대상으로 용접선 방향이 피로균열성장속도에 미치는 영향, 용접방법 및 강도등급에 따른 피로균열성장특성, 그리고 각 재질별(모재부, 열영향부, 용접금속부) 피로균열 성장특성을 정량적으로 평가하기 위해서 CT시험편을 제작해서 일련의 피로시험을 실시하였다. 피로시험결과 노치가 용접선과 평행한 시험체의 경우 노치선단에 존재하는 압축잔류응력의 영향으로 노치가 용접선과 직각인 시험체의 경우보다 피로균열성장속도의 지연현상이 현저해지는 것을 알 수 있었다. 그리고 용접 방법에 따른 피로균열성장특성은 강재의 강도등급에 관계없이 FCAW가 SAW에 비해서 피로균열성장속도의 분산이 적게 나타나고 있으며, 또한 높은 응력확대계수범위 영역에서 피로균열성장속도의 수렴현상이 나타나는 것을 알 수 있었다. 한편 본 피로시험결과와 기존의 연구결과를 비교하면 피로균열성장영역에서의 피로균열성장속도는 유사한 경향을 나타내고 있으므로 본 연구에서 대상으로 한 강재는 피로안전성을 충분히 확보하고 있음을 알 수 있었다.
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파라메트릭 기술기반 철근 콘크리트 구조물의 기둥부재 자동배근시스템 구축에 관한 연구
홍성욱,조영상,이제혁,홍성철,Hong, Seong-Uk,Cho, Young-Sang,Lee, Je-Hyuk,Hong, Seong-Chul 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1
Recently, as there has been high interests in Building Information Modeling (BIM), there are studies and movements to adapt this new paradigm in both academic field and industrial field. While, Reinforced concrete structure is a mainly used structural system in Korea. However, it is limited the development of reinforced concrete system in BIM comparing to that of steel structures. The primary reason is that it is not interoperable the information on reinforcement in RC structures and the progress of modeling reinforcement has a low productivity for a reinforcement object being created manually by user in the BIM platform. For the requirements, ARPM(Automatic Reinforcement Placing Module) has been developed to connect structural analysis and design database to BIM platform, to perform the design of reinforcement placing and to draw reinforcement in BIM platform, in this study. By developing the ARPM, it is expected to raise the productivity of the construction for RC structures and increase the effectiveness in the current modeling process in BIM platform.
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여러 스팬을 갖는 티모센코 보 구조물의 이동하중에 의한 진동 해석
홍성욱,김종욱,Hong, Seong-Uk,Kim, Jong-Uk 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.11
The present paper proposes a new dynamic analysis method for multi-span Timoshenko beam structures supported by joints with damping subject to moving loads. An exact dynamic element matrix method is adopted to model Timoshenko beam structures. A generalized modal analysis method is applied to derive response formulae for beam structures subject to moving loads. The proposed method offers an exact and closed form solution. Two numerical examples are provided for validating and illustrating the proposed method. In the first numerical example, a single span beam with multiple moving loads is considered. A dynamic analysis on a multi-span beam under a moving load is considered as the second example, in which the flexibility and damping of supporting joints are taken into account. The numerical study proves that the proposed method is useful for the vibration analysis of multi-span beam-hype structures by moving loads.
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Effects of Substrates on Nanofiltration Characteristics of Multilayer Polyelectrolyte Membranes
홍성욱,Hong, Seong-Uk The Membrane Society of Korea 2008 멤브레인 Vol.18 No.2
선행 연구에서 poly(styrene sulfonate) (PSS)/poly(diallyldimethylammonium chloride) (PDADMAC) 나노 여과막을 사용하여 불소 이온을 포함한 1가 이온 혼합물을 분리하는 것이 가능함을 보였다. 예를 들면, 다공성 알루미나 지지체에 $(PSS/PBADMAC)_4PSS$ 필름을 코팅한 경우 염소/불소 이온의 선택도가 3 이상이었으며 4.8 bar에서 용액의 플럭스가 $3.5m^3/m^2$-day이었다. 그러나, PSS/PDADMAC 이층의 수가 4.5에서 5.5.로 증가하면 염소/불소 이온의 선택도가 1.9로 떨어졌으며, $(PSS/PDADMAC)_6PSS$ 필름의 경우에는 염소 이온의 배제율이 급속히 증가하면서 선택도가 1에 가까웠다. 이러한 선택도의 감소 현상은 예상치 못한 것으로서 다른 지지체를 사용하여도 같은 경향을 보이는지 여부는 불분명하였다. 따라서, 본 연구에서는 다공성 알루미나 대신에 분획 분자량이 50kDa인 다공성 polyethersulfone (PES)에 PSS/PDADMAC을 적층하고 불소/염소 이온 혼합물의 나노 여과 특성을 살펴보았다. 그 결과 다공성 알루미나의 경우와 비록 적층 수는 달랐으나 불소 이온의 배제율이 최대가 되는 최적 적층수가 존재하였으며 이로부터 이러한 현상이 지지체에 무관한 일반적인 사실임을 알 수 있었다. In a previous study, we probed the potential of poly(styrene sulfonate) (PSS)/poly(diallyldimethylammonium chloride) (PDADMAC) nanofiltration (NF) membranes for the separation of monovalent anions, with an emphasis on the selective rejection of $F^-$. Remarkably, deposition of $(PSS/PBADMAC)_4PSS$ films on porous alumina supports yielded membranes that exhibited $Cl^-/F^-$ selectivity > 3 with minimal $Cl^-$ rejection, and a solution flux of $3.5m^3/m^2$-day at 4.8 bar. When the number of PSS/PDADMAC bilayers was increased from 4.5 to 5.5, however, $F^-$ rejection decreased from 73% to 50% and $Cl^-/F^-$ selectivity dropped to 1.9. Addition of another bilayer to form $(PSS/PDADMAC)_6$ PSS films resulted in a significant increase in $Cl^-$ rejection to give essentially no $Cl^-/F^-$ selectivity. The decrease of selectivity with deposition of more than 4.5 bilayers was not expected and it was unclear whether this characteristic was substrate independent. In this study, to investigate the effect of substrates on NF performance of multilayer polyelectrolyte membranes, PSS/PDADMAC films were deposited on 50 kDa polyethersulfone (PES) ultrafiltration supports instead of porous alumina supports. The results indicate that, although fluoride rejection and the number of bilayers at which a maximum $F^-$ rejection occurs are different, the trend is similar for both types of substrates. Therefore, we can conclude that the M: characteristics of multilayer polyelectrolyte membranes may be substrate independent.
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Unet-VGG16 모델을 활용한 순환골재 마이크로-CT 미세구조의 천연골재 분할
홍성욱,문덕기,김세윤,한동석,Sung-Wook Hong,Deokgi Mun,Se-Yun Kim,Tong-Seok Han 한국전산구조공학회 2024 한국전산구조공학회논문집 Vol.37 No.2
Segmentation of material phases through image analysis is essential for analyzing the microstructure of materials. Micro-CT images exhibit variations in grayscale values depending on the phases constituting the material. Phase segmentation is generally achieved by comparing the grayscale values in the images. In the case of waste concrete used as a recycled aggregate, it is challenging to distinguish between hydrated cement paste and natural aggregates, as these components exhibit similar grayscale values in micro-CT images. In this study, we propose a method for automatically separating the aggregates in concrete, in micro-CT images. Utilizing the Unet-VGG16 deep-learning network, we introduce a technique for segmenting the 2D aggregate images and stacking them to obtain 3D aggregate images. Image filtering is employed to separate aggregate particles from the selected 3D aggregate images. The performance of aggregate segmentation is validated through accuracy, precision, recall, and F1-score assessments.
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