• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 1997.11a
• /
• pp.21-21
• /
• 1997

인공위성용 추진제 탱크를 개발하기 위해 여러 설계인자를 설정하여 각 인자가 탱크벽면에 미치는 응력분포 영향을 구하고, 또한 최적의 인자 값을 구하기 위해 각 인자의 변화에 따라서 구조해석을 수행하였다. 탱크 지지부 위치와 탱크 벽면 두께 변화에 따른 탱크 벽면에 미치는 응력분포 영향을 고찰하기 위해 1/4 모델을 설정하였고, 연료배출구의 위치변화(경사각돈)에 따른 응력분포는 1/2 모델을 설정하여 해석을 하였다. 탱크에 작용하는 하중은 연료압력에 의해 발생하는 정하중(350 psi)을 가하며 또한, 발사 시 발사체로부터 전달되는 최대동하중(llg)을 고려하였다. 그리고, 탱크가 인공위성에 장착될 때에 발생하는 다양한 장착조건에 대해서 구조해석을 수행하였고, 추진제 배출구 각도가 $0^{\circ}$ 에서 $25^{\circ}C$까지 변화할 때 탱크 벽면에 미치는 응력분포 영향을 구했다. 그래서 각 조건에서 구한 상당응력분포와 인자의 최적 값은 추진제 탱크를 설계하기 위한 기초적인 자료로 활용하고자 한다.

• The Journal of the Korea Contents Association
• /
• v.14 no.9
• /
• pp.343-349
• /
• 2014

The dental osseointegration implant should be enough to endure occlusion load and it's required to have efficient design and use of implant to disperse the stress into bones properly. Solidworks as a finite element analysis program for modeling and analysis of stress distribution was used for the research. The simple crown model was designed on applying conjoined condition with tightening torque of 20 Ncm of a abutment screw between a cement retained implant abutment and a fixture. A $45^{\circ}$ oblique loading from lingual to buccal side on buccal cusps of crown and performed finite element analysis by 100 N of external load. The results by a analysis for stress distribution of supporting bones of fixture were as below. The von Mises stress was concentrated on the upper side of supporting compact bone regardless of the diameters and lengths of fixture, and the efficiency result of stress reduction was increase of fixture's diameter than it's length. Therefore, it's effective to use wider fixture as possible to the conditions of supporting jaw bone.

• Magazine of the Korea Concrete Institute
• /
• v.10 no.4
• /
• pp.135-143
• /
• 1998

The wheel load distribution width for lane load is not specified in current Korea bridge design code(KD code), not like in current AASHTO and AASHTO LRFD specifications which specity it as twice of wheel load distribution width for wheel load. In this study, the wheel load distribution width in continuous reinforced concrete slab bridge is investigated. The major variables affecting the wheel load distribution of a reinforced concrete continuous slab bridge are the span length, bridge width, existence edge beam and boundary condition. From a series of comprehensive parametric study on each variable, the formula for wheel load distribution in continuous reinforced concrete slab bridge is proposed from the nonlinear regression analysis of finite element analysis results. The proposed formulas can be used efficiently in the accurate design of continuous reinforced concrete slab bridges.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.23 no.3
• /
• pp.255-266
• /
• 2010

In high-rise buildings, an outrigger system is frequently used as a resisting system for lateral loads. Since the outriggers tie exterior columns and an interior core, exterior columns can participate in the lateral load resisting system and the structural resistance capacity can be increased. However, the outriggers contribute for controlling gravity loads as well as lateral loads. The flows of gravity loads can be changed by the members of outriggers, for the purposes of transferring loads to mega-columns, distributing gravity loads equally among vertical members of columns, walls, or piles, minimizing differential settlements in a foundation system, and so on. In this study, by computational structural analyses of high-rise buildings over 100 floors, the effects of outriggers on controlling gravity loads are analyzed. Analyses for 3-dimensional models with or without outrigger members are performed, and then the gravity load distributions in columns and piles and foundation settlements are analyzed. Also, the effects of outriggers on gravity load controls during construction stages as well as after construction are included.

• Journal of Korean Society of Steel Construction
• /
• v.23 no.3
• /
• pp.283-294
• /
• 2011

The variation of temperature in the steel girder bridge by air temperature is measured. A correlation between the daily temperature range, the maximum and minimum temperatures of the day, and the temperature of the bridge are analyzed. With the statistical data from the Korea Meteorological Administration, the temperature correlations analyzed in this study is able to predict temperature variations between the upper flange and the lower flange which calculates the realistic displacement values of a movable support and an expansion joint in design.

• Journal of the Korean Geotechnical Society
• /
• v.17 no.2
• /
• pp.85-93
• /
• 2001

본 논문에서는 연약지반에 시공된 교대말뚝기초에 인접하여 성토하중이 재하될 때 발생하는 측방유동의 발생메커니즘을 규명하기 위해 3차원 유한요소해석을 수행하였다. 본 수치해석에서는 점성토 지반과 점성토-사질토 지반 그리고 사질토-점성토 지반에 선단지지된 강관말뚝에 대하여 성토하중 크기(q=20, 75, 100kPa)와 말뚝두부조건(변위구송, 회전구속) 그리고 말뚝중심간격(s=2.5d, 5.0d, 7.0d, 단독말뚝)에 따라 측방유동압의 분포형태와 크기를 분석하였다. 그 결과 측방유동압의 분포형태는 교대말뚝기초의 수평변위와 유사한 형태로 나타났으며 측방유동압의 크기는 배면 성토하중의 크기에 대한 비로써 결정할 수 있었다. 그리고 점성토 지반과 점성토-사질토 지반의 경우, 측방유동압의 분포형태와 크기는 말뚝두부조건에 가장 큰 영향을 받는 반면 사질토-점성토 지반의 경우에는 말뚝두부조건보다는 토층조건에 가장 큰 영향을 받는 것으로 분석되었다. 본 연구결과를 토대로 연약지반에 시공된 교대말뚝기초의 측방유동에 대한 설계 및 해석시 지침자료로서 측방유동압의 분포형태와 크기를 추천.제안한다.

• International Journal of Highway Engineering
• /
• v.5 no.4 s.18
• /
• pp.13-22
• /
• 2003

Several design methods from overseas are employed without considering different conditions such as material properties, climate, and traffic condition in this country. Therefore, there are limitations in application. Therefore, new pavement analysis system which is able to design a pavement efficiently and economically should be set up. In this study, 243 probable sections are classified depending on values of layer thickness and elastic modulus, and the effect of load types for the probable sections are analyzed. The section showing larger load distribution is chosen for analysis. As a result of sensitivity, a layer thickness has more influence on pavement than an elastic modulus does. The stress distribution of FWD test load is larger than that of circular load. This study compares outputs between nonlinear elastic model and linear elastic model. Based on the result, this study finds nonlinear elastic model considering stress condition in the ground is recommended for subbase.

• Journal of the Earthquake Engineering Society of Korea
• /
• v.9 no.6 s.46
• /
• pp.21-30
• /
• 2005

In this study, a seismic design methodology for friction dampers based on the story shear force distribution of an elastic building structure is proposed. First, using two normalization methods for the slip-load of a friction damper, numerical analyses of various single-degree-of-freedom systems are peformed. From those analyses, the effect of the slip-load and the brace stiffness was investigated and the optimal silliness ratio of the brace versus original structure was found. Second, from the numerical analysis for five multi-story building structures with different natural frequency and the number of story, reasonable decision method for the total number of installation floor, location of installation and distribution of the slip-loads are drawn. In addition, an empirical equation on the optimal number of installation floor is proposed. Finally, the superiority of the proposed method compared to the existing design method is verified from the numerical analysis using real earthquake data.

• Bulletin of the Korean Space Science Society
• /
• 2004.04a
• /
• pp.44-44
• /
• 2004

GPS를 이용하여 대기 수증기의 3차원 분포도를 구하기 위하여, 관측소와 GPS 위성 간 시선방향으로의 수증기에 의한 GPS 신호지연 정도를 결정할 필요가 있다. 이 때 정확성 향상을 위하여 반드시 고려해야하는 위상중심변화(phase center variations)와 조석하중에 의한 지각변위(ocean loading displacements) 등 수직방향 좌표 결정 오차를 유발하는 요인들을 소개한다. 타 연구를 통해 위상중심변화는 크게는 l0cm 이상의 오차를, 그리고 조석하중에 의한 지각변위는 한반도의 경우 최대 3-4cm 정도의 오차를 보임을 알았지만, 이들 오차가 시선방향 습윤지연 결정에 미치는 영향은 규명되지 않았다. (중략)

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2014.11a
• /
• pp.220-221
• /
• 2014

Recently It has been required the research for the load of transport of the unit module to secure the safety of the transport locking device. So the purpose of this study is to analyze the probability distribution of the load of transport of unit modular when transporting unit modular by vehicle.