• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.05a
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• pp.111-114
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• 1994

상대적으로 사하중에 비해서 활하중 영향이 민감하게 작용하는 농업시설의 경우, 경제성 및 안정성에 근거한 구조설계를 위해서는 활하중의 결정요인의 정확한 분석을 통한 합리적인 설계하중의 산정이 필요하다. 단위적설 중량은 적설심에 따른 구분을 사용한다면 대부분 적설심 50cm 이하의 범위에 속하기 때문에 일률적으로 1.0kg/cm/$m^2$ 을 적용해야 하지만, 정확한 적설하중 산정을 위해서 기온에 따른 단위 적설중량의 변화를 분석할 필요가 있다. (중략)

• Aerospace Engineering and Technology
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• v.8 no.2
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• pp.13-18
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• 2009

In this study, an equivalent unit load methodology has been presented to simplify the fatigue analysis procedure. And fuselage structure fatigue life has been evaluated based on equivalent unit load. Finite element analysis has been carried out to analyze the stress intensity factor and geometrical correction factor that is needed for crack growth analysis. And strain energy density factor is used to predict the initial direction of crack propagation.

• Journal of the Earthquake Engineering Society of Korea
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• v.7 no.1
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• pp.65-72
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• 2003

The objective of this study is to estimate the frequency characteristics of group walking loads based on the information of measured responses. At first, dynamic properties such as natural frequencies and modes are obtained from input/output relation for building structures by heel drop test. Second, a method to estimate group walking loads by the transfer functions from measured responses to group walking loads is proposed. The method turned out to estimate the group walking loads accurately. Higher modes could be important in estimating the amplitude of group walking loads with the information of single walking load.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.5C
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• pp.163-170
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• 2011

Perimeter load transfer functions were developed by an analysis of the static pile load test results of the 7 large diameter drilled shafts constructed in domestic areas. Using the pile axial load distributions obtained from the static pile load tests of large diameter drilled shafts, the unit skin frictions were analyzed and, based on unit skin friction test data, perimeter load transfer functions could be suggested. The load transfer distributions calculated by suggested functions and the load transfer functions obtained from the bi-directional pile load tests were compared. As a result, the 2 load transfer distributions were coincided, respectively.

• Journal of the Korean GEO-environmental Society
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• v.9 no.1
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• pp.41-46
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• 2008

In this study, the analysis of load transition of PHC pile was performed with the static load test, which was driven in deep soft clay layer of MyungJi site in the western area of Pusan. The results of test showed that the range of unit side resistance of pile in sand layer were $7.4t/m^2$ to $23.3t/m^2$ and $6.4t/m^2$ in the soft clay layer, while the unit base resistance was $955t/m^2$ in dense silty sand layer. To select the most reasonable static bearing capacity formular, the field measured values are compared with the calculated ones from the suggested various formular. In the case of side resistance in sand layer, the suggest formular in the Structural Foundation Design Manual by KGS was most reasonable, while in clay layer Railroad Design Manual.

• Journal of Korean Society of Steel Construction
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• v.17 no.3 s.76
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• pp.337-346
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• 2005

A composite bridge deck system assembled from a modular profile with double-rectangular cell has been developed for highway bridges. This study is focused on the experimental characterization of flexure performance of pultruded GFRP deck under static loading. Several tests were conducted on single modules and adhesively bonded 2 and 5-modules. The specimen details such as dimensions, material properties and fiber architecture, and experimental set-up and testing procedure have been addressed. It is found that the presented GFRP composite modular deck is very efficient for use in bridges.

• Geotechnical Engineering
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• v.12 no.6
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• pp.79-86
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• 1996

This study develops a new method for interpreting the yield load from load tests on drilled shaft foundations ended on general soils, which is defined as a point where the maximum curvature on the hyperbolic-approximated load-settlement curve occurs. How ever, the point of maximum curvature is a variable depending on the units and scales of the load and settlement. Therefore, to obtain a unique maximum curvature point, both the load and settlement must be normalized by proper parameters, respectively, and be expressed on the same scaled arses(1:1). Normalization has been processed so that the yield load by the new interpretation is to be close to the average of yield loads interpreted by other methods investigated in this study. The quantitative comparison between the new criterion and other conventitonal methods is presented.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.725-728
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• 2010

풍력실험결과를 이용한 풍하중 산정 방법은 고층건물에 작용하는 풍하중을 산정하는 대표적인 방법이다. 일반적인 고층건물의 경우, 이 방법은 구조물의 형상에 변화가 없다면, 구조물의 고유진동수가 증가할수록 구조물에 작용하는 풍하중 크기는 감소하는 특성을 가지고 있다. 한편, 재분배기법은 단위하중법을 통해 계산되는 변위기여도를 근거로 하여 구조물의 형상은 유지하면서 각 부재 단면의 크기만을 변화시켜서 구조물의 강성을 조절하는 설계기법이다. 이 방법은 효과적인 물량 재분배를 통해 구조물의 강성을 증가시키고 이를 통해 구조물의 고유진동수를 증가시키는 특징을 가진다. 본 논문에서는 재분배기법을 이용하여 고층건물 구조설계 시 구조물에 작용하는 풍하중 크기를 합리적으로 감소시키는 방법을 제안하였다. 제안된 방법을 풍력실험을 실시한 실구조물에 적용한 결과 구조물에 작용하는 풍하중 크기가 감소하고, 이를 통해 구조물량을 효과적으로 감소시킬 수 있음을 확인하였다.

• Journal of Aerospace System Engineering
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• v.15 no.1
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• pp.80-85
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• 2021

In this study, for conducting a static load test of an external fuel tank used for an aircraft, the flight load acting on the external fuel tank was converted to the test load and the suitability of the converted test loads was confirmed. In order to calculate the test load from the flight load, the external fuel tank was divided into several sections. Shear load, moment by unit shear load, and unit moment were calculated for each section. Test loads for each section were then calculated by computing the shear load, the moment of each section, and flight load condition. In actual static load tests, it might not be possible to impose the test load in the calculated position due to physical constraints. Therefore, after determining positions in which the load could be imposed in the actual test, the test load calculated for each section was redistributed to selected positions. Finally, a test load plan was established by applying a whiffle tree to enhance the efficiency of the test performance while making it easier to operate the actuator. The reliability of the test load plan was verified by comparing it with flight load conditions.

• Journal of the Korean Geotechnical Society
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• v.30 no.11
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• pp.61-69
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• 2014

In this study, the performance of group suction anchors installed in sand and subjected to pullout loading was investigated by numerical analysis. The group suction anchors consist of two or three units rigidly connected to each other in parallel array and the pullout resistances were compared with that of a single anchor. Parametric study was performed using numerical models to study the effect of the physical conditions of the group anchor. The parameters include the skirt length to diameter ratio of a unit suction anchor, the pad-eye location, inclination of loading and the spacing between unit suction anchors. The analysis shows that the ratios of the pullout capacity of double suction anchor and triple suction anchor to that of single anchor are 1.7 and 2.4, respectively. The ratio increases with the increase in the spacing between the unit anchors. The other parameters such as the skirt length to the diameter ratio, the location of the pad-eye and the loading inclination have negligible effect on the ratio of pullout resistances of the group anchor to the single anchor.