• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.144-144
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• 2003

니켈계 내열합금의 성형은 수백 $^{\circ}C$에 이르는 고온에서 이루어지기 때문에 열간성형 과정에서 소재 내부의 미세조직 변화에 대한 이해는 부품의 특성 제어 측면에서 매우 중요하다. 특히 열간 동적 재결정에 의해 발생되는 결정립 구조의 변화를 적절히 조절함으로써 부품의 특성을 극대화 할 수 있다. 본 연구에서는 Ni-Fe계 초내열합금에 대한 고온 압축실험과 압축시편에 대한 EBSD 분석을 통해 열간 변형 과정에서 발생하는 소재 내부의 동적인 결정립 구조의 변화를 정량적으로 분석하고자 하였다. 고온 압축시험은 101$0^{\circ}C$, 1066$^{\circ}C$의 온도 조건과 0.5s-1, 0.005s-1의 변형율 속도 조건에서 최대 진변형율 0.7까지 수행하였으며 진변형율에 따른 결정립 조직 변화를 관찰하기 위해 진변형 율에도 변화를 주어 실험을 수행하였다. 이들 고온 압축시편은 응력방향에 평행한 면에 대한 미세조직 관찰을 통해 재결정립 크기, 분율 및 결정립계의 특성 변화에 대한 정량적 연구를 수행하였다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.441-444
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• 2010

대공간 구조물과 초고층 빌딩에 있어 건축물의 자중 감소에 대한 요구가 늘어나고 있으며 이에 대한 가장 효과적인 방법 중 하나는 경량 콘크리트를 사용하는 것이다. 본 연구는 최외단 철근의 순인장 변형률에 따른 경량콘크리트 보의 휨 거동 및 휨 성능을 평가하는 것에 그 목적이 있다. 크기와 형상이 동일한 보통중량 콘크리트 보 1개와 경량 콘크리트 보 4개의 총 5개 시험체를 제작하여 최외단 철근의 순인장 변형률을 변수로 실험을 수행하였으며 이를 통해 순인장 변형률에 따른 경량콘크리트 보의 강도와 연성의 변화를 분석하였다. 실험 결과 최외단 철근의 순인장 변형률이 증가할수록 시험체의 연성비는 증가하였으며 최대하중과 강성은 감소하였다. 특히 순인장 변형률 0.005 이상에서 연성지수 2 이상을 확보할 수 있었다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.6 no.3
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• pp.193-199
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• 2002

Structral crack of RC structure generally occurs when the tension stress by applied load is larger than tension resistance of concrete, and it means deterioration of structure and the decrease of load resistance. Because structural crack of structure can occur critical damage to structure occasionally, the research on crack detection algorithm of RC structure is needed for assurance of structural safety and effective maintenance of structure. In this paper, we executed the laboratory test on measuring strain of RC beam's tension and compression zone, using strain gauge which is widely used on strain measurement of civil structure. By using measured strain, we analyzed strain change, elastic modulus change, and neutral axis change to detect crack of RC beam. As a result, we proposed the simple and effective crack detection algorithm using trends of neutral axis position change.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.6
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• pp.532-540
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• 2008

Recently there are growing interests in calculating aerodynamic characteristics of aircraft configurations with structural deformation using the FSI(Fluid-Structure Interaction) system in which CFD(Computational Fluid Dynamics) and CSD(Computational Structure Dynamics) modules are coupled. In this paper the FSI system comprised of CAD, CFD, CSD, VSI(Volume Spline Interpolation) and grid deformation modules was constructed in order to investigate aerodynamic characteristics of the deformed shape. In the process VSI and grid generation modules are developed to combine CSD and CFD routines and to regenerate the aerodynamic grids for the deformed shape, respectively. For the CFD and CSD analysis, commercial programs FLUENT and NASTRAN were used. As a test model, DLR-F4 wing configuration was chosen and its aerodynamic characteristics were calculated by applying the static FSI system. It was shown that lift and drag coefficients of the wing at mach number 0.75 are reduced to 20.26% and 18.5%, respectively, owing to the structural deformation.

• Journal of Korean Society of Steel Construction
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• v.10 no.1 s.34
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• pp.1-10
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• 1998

The temporary steel bridges which are constructed for detour and constructional expediency are consisted of H-beams(as superstructure) and H-piles(as substructure). Because these members are fastened by high-tension bolts, there are no expansion joints in these bridges. So, these kinds of bridges have no system which can relieve the excessive thermal stress. In this investigation, monitoring system was set up at temporary steel bridge and stress and temperature changes of H-beam are monitored. From these measured data, it is analyzed that the relationship between ambient and main-girder temperature change, between temperature and stress change. With these analyses, it is resulted that the thermal stress take main part of stress variation in this bridge and the restrain of thermal longitudinal displacement of H-pile. In addition, because the connection part of H-beam to H-beam is weak in the continuous spans, the sub-modelling is well apt to reflect the effect of thermal stress.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.05b
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• pp.981-986
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• 1995

이 논문의 목적은 축대칭 프리스트레스트 콘크리트 탱크의 시간의존성 유한요소해석법을 제안하는 것이다. 오늘날 PC구조물은 교량, 포장판, 해상구조물, 원자로 격납구조물, 대규모 액체저장용 탱크 등 여러 형태의 구조물에서 그 사용 예를 쉽게 찾아볼 수 있다. 특히 본 논문에서 고려하고자 하는 압력창기나 액체 저장용 탱크의 경우 유체압력 등의 내부압력에 의해 발생하는 균열은 프리 스트레스를 도입함으로써 매우 효과적으로 제어할 수 있기 때문에 상당히 유리한 구조형식이 된다. 그러니 이러한 구조물의 해석과 설계에 있어서 균열의 예측과 더불어 콘크리트의 크리이프, 건조수축 및 PC강재의 리락세이션 등과 같은 시간 의존성 변형으로 인한 프리스트래스의 손실, 여러 단계의 긴장력을 도입함으로써 발생하는 순간변형인 탄성단축 및 이로 인한 긴장력 감소 등을 정확히 계산하는 일은 매우 복잡하고 어려운 일이다. 본 논문에서는 크리이프, 건조수축 및 리락세이션 등과 같은 시간의존성 변형과 순차적으로 다단계의 프리스트레스 도입으로 인한 순간변형 및 탄성단축의 영향을 고려한 축대칭 PC 탱크 구조물의 시간에 따른 거동 및 긴장력의 변화를 유한요소법을 적용하여 해석할 수 있는 해법체계를 정리하고 이를 전산 프로그램화하여, 축대칭 PC탱크 구조물의 시간 의존성 거동에 대한 보다 정밀한 해석을 수행하였다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.4
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• pp.1295-1302
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• 2013

The structural deformed shape is important information to structural analysis. If the sufficient measuring points are secured at the structural monitoring system, reasonable and accurate structural deformation shapes can be obtained and structural analysis is possible using this deformation. However, the accurate estimation of the global structural shapes might be difficult if sufficient measuring points are not secure under cost limitations. In this study, SFSM-LS algorithm, the economic and effective estimation method for the structural deformation shapes with limited displacement measuring points is developed and suggested. In the suggested method, the global structural deformation shape is determined by the superposition of the pre-investigated structural deformed shapes obtained by preliminary FE analyses, with their optimum weight factors which lead minimization of the estimate errors. 2-span continuous bridge model is used to verify developed algorithm and parametric studies are performed. By the parametric studies, the characteristics of the estimation results obtained by the suggested method were investigated considering essential parameters such as pre-investigated structural shapes, locations and numbers of displacement measuring points. By quantitative comparison of estimation results with the conventional methods such as polynomial, Lagrange and spline interpolation, the applicability and accuracy of the suggested method was validated.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1992.08a
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• pp.77-82
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• 1992

쇄파역이 포함된 연안해역에 구조물등이 설치될 경우, 심해에서 발달하여 진행해온 파랑은 구조물 주변에서 반사 및 회절에 기인하여 지배적으로 변형하여 주변해역의 파랑장이 변화하게 되며, 특히 쇄파대에 위치한 구조물 주변에서는 복잡한 파랑변형 양상을 나타내게 된다.(중략)

• Journal of the Korea institute for structural maintenance and inspection
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• v.27 no.1
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• pp.86-94
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• 2023

In this study, a supplementary detail capable of restraining out-of-plane deformation was proposed for steel slit dampers, and a constant amplitude cyclic loading test was performed with the application of the proposed detail and the shape ratio of the damper as variables. Repeated hysteresis and cumulative plastic deformation according to the test results were analyzed. Repeated hysteresis of the slit damper with the proposed detail showed a stable spindle-shaped hysteresis within the set variable range, and no out-of-plane deformation of the damper was observed until ultimate state. It was confirmed that the restraining panel effect through the application of the proposed details is effective in terms of both the strength and deformation capacity of the damper. In addition, experimental parameters for the fatigue curve evaluation of slit dampers were derived in this study. Based on the results, it is judged that quantitative comparison of structural performance with various types of seismic devices will be possible in the future.

• Journal of Korean Association for Spatial Structures
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• v.7 no.3 s.25
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• pp.49-55
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• 2007

In this paper, always monitoring system of fiber Bragg Crating(FBG)Sensor is described and FBGs are well suited for measuring the movement in the part of the spatial structure(for example, cable, membrane and so on)under the pressure conditions. In order to measure the movement of long span structure, we need the measurable equipment that takes in many spots to measure. In the result of experiment, the fiber sensors showed good response to the pressure conditions. Therefore, We could calculate the movement of spatial structure and be possible health monitoring of the spatial structure.