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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Computational Structural Engineering Institute of Korea
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Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 25, Issue 6 - Dec 2012
Volume 25, Issue 5 - Oct 2012
Volume 25, Issue 4 - Aug 2012
Volume 25, Issue 3 - Jun 2012
Volume 25, Issue 2 - Apr 2012
Volume 25, Issue 1 - Feb 2012
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Analysis of Compressive Fracture Behavior of Filled FRP Composite Box Module
Kim, Ho-Sun ; Jang, Hwa-Sup ; Lee, Ho-Hyun ; Yun, Kuk-Hyun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 1~8
DOI : 10.7734/COSEIK.2012.25.1.001
This study is a basic experimental research to apply FRP (Fiber Reinforced Polymer) box members to slabs and girders among various architectural structures, which receive bending stress. We prepared prefabricated FRP member and connected it to an FRP box member as a large cross section before we conducted an experiment in diverse conditions to analyze characteristics of compressive fracture behavior. In this study, we carried out a compressive fracture behavior test according to fillers on the upper part of the FRP box member, loading methods, and connective types and thereby performed a finite element analysis. The comparison of analysis results with test results revealed that rigidity was found to be slightly low, while stress was concentrated on the fracture point of the sample.
Parametric Modeling and Design of Building Information Model for Extradosed Bridge
Park, Yeon-Soo ; Lee, Byung-Geun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 9~18
DOI : 10.7734/COSEIK.2012.25.1.009
The BIM called information modeling is used by tool not only it will simply be appearing the image and can save the information. Recently, there is a lot of case that improves the construction productivity by using the BIM during the life cycle of bridge from order to management. Although we already recognize the advantage of BIM, it is a careful phase to use the BIM. Therefore, We made the BIM for bridge, evaluated the possibility that can build the object used in the civil engineer, studied about the utility, the improvement in order to use the BIM properly. As a result, the BIM can recycle the information by using parametric model and attribute the efficiency and accuracy on drawing and calculating the quantity. The BIM is able to help productivity increase by using the builded model after we spend the effort building a model in early stage.
Progressive Collapse Resisting Capacity of Building Structures with Infill Steel Panels
Lee, Ha-Na ; Kwon, Kwang-Ho ; Kim, Jin-Koo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 19~26
DOI : 10.7734/COSEIK.2012.25.1.019
In this study the progressive collapse behavior of a moment frame with infill steel panels is evaluated using nonlinear static pushdown analysis. The analysis model is a two story two span structure designed only for gravity load, and the load-displacement relationship is obtained with the center column removed. To obtain local stress and strain as well as the global structural behavior, finite element analysis is conducted using ABACUS. Through the analysis the effect of the span length and the thickness of the steel plate on the progressive collapse behavior of the structure is investigated, and the effect of the dividing the infill panel using stud columns is also studied. According to the analysis results, the thickness of the panels required to prevent progressive collapse increases as the span length increases, and as the number of panel division increases the progressive collapse resisting capacity increases slightly but the effect is not significant. It is also observed that when the infill panel is installed in only a part of the span the progressive collapse resisting capacity is somewhat increased.
Structural Optimization of the Mobile Harbor Carne Considering Sea State
Lee, Jae-Jun ; Lim, Won-Jong ; Jeong, Seong-Beom ; Jung, Ui-Jin ; Park, Gyung-Jin ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 27~36
DOI : 10.7734/COSEIK.2012.25.1.027
The mobile harbor is a new concept system to solve the problems of a port. These problems are that container ships cannot be anchored at the dock because they have become larger or the waiting times of anchoring the ships are increased due to heavy container traffic. A new system is designed to carry out the loading and unloading of containers between the mobile harbor and the container ship using the mobile harbor crane at sea. The crane plays an important role when transferring the containers. In this research, various types of the mobile harbor crane are proposed and structural optimization for each type of the crane is carried out. The loading conditions consider the rolling and pitching conditions of the unstable sea state and the wind force are considered. The constraints are mainly the regulations made by the Korean Register of Shipping. The structure of the crane is optimized to minimize the mass while various constraints are satisfied.
A Structural Analysis of the SNF(Spent Nuclear Fuel) Disposal Canister with the SNF Basket Section Shape Change for the Pressurized Water Reactor(PWR)
Kwon, Young-Joo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 37~49
DOI : 10.7734/COSEIK.2012.25.1.037
A structural model of the SNF(spent nuclear fuel) disposal canister for the PWR(pressurized water reactor) for about 10,000 years long term deposition at a 500m deep granitic bedrock repository has been developed through various structural safety evaluations. The SNF disposal baskets of this canister model have the array type whose four square cross section baskets stand parallel to each other and symmetrically with respect to the center of the canister section. However, whether this developed structural model of the SNF disposal canister is optimal is not determinable yet. Especially, there is still a problem in weight-reduction of the canister. The cross section shape of the SNF basket should be changed to solve this problem. There are two ways in changing the cross section shape of the SNF basket; the one is to rotate the cross section itself and the other is to change the cross section shape as other shape different from the square cross section. The previous study shows that the canister with
rotated basket array is structurally more stable than the canister with un-rotated parallel basket array. However, whether this canister with rotated basket array is optimal is not either determinable as yet, because it is not revealed that the canister with other cross section different from the square cross section is structurally more stable than other canisters. Therefore, the structural analysis of the SNF disposal canister with other cross section shape which is also symmetric with respect to the canister center planes is very necessary. The structural analysis of the canister with various cross section shape basket array in which each basket is arrayed symmetrically with respect to the center planes is carried out in this paper. The structural analysis result shows that the SNF disposal canister with circular cross section shape baskets located symmetrically with respect to the center of the canister section is structurally more stable than the previously developed SNF disposal canister with the parallel basket array.
A Study on Configuration Optimization for Rotorcraft Fuel Cells based on Neural Network
Kim, Hyun-Gi ; Kim, Sung-Chan ; Lee, Jong-Won ; Hwang, In-Hee ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 51~56
DOI : 10.7734/COSEIK.2012.25.1.051
Crashworthy fuel cells have been widely implemented to rotorcraft and rendered a great contribution for improving the survivability of crews and passengers. Since the embryonic stage of military rotorcraft history began, the US army has developed and practised a detailed military specification documenting the unique crashworthiness requirements for rotorcraft fuel cells to prevent most fatality due to post-crash fire. Foreign manufacturers have followed their long term experience to develop their fuel cells, and have reflected the results of crash impact tests on the trial-and-error based design and manufacturing procedures. Since the crash impact test itself takes a long-term preparation efforts together with costly fuel cell specimens, a series of numerical simulations of the crash impact test with digital mock-ups is necessary even at the early design stage to minimize the possibility of trial-and-error with full-scale fuel cells. In the present study a number of numerical simulations on fuel cell crash impact tests are performed with a crash simulation software, Autodyn. The resulting equivalent stresses are further analysed to evaluate a number of appropriate design parameters and the artificial neural network and simulated annealing method are simultaneously implemented to optimize the crashworthy performance of fuel cells.
Seismic Fragility Evaluation of Surface Facility Structures in Intermediate-Low Level Radioactive Waste Repository
Park, Jun-Hee ; Kim, Min-Kyu ; Choi, In-Kil ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 57~64
DOI : 10.7734/COSEIK.2012.25.1.057
Since a seismic exceeding design load can result in exposing radioactive material during disposal process of radioactive wastes, the repository should be designed with enough seismic margin. In this paper, a seismic fragility analysis was performed to evaluate the seismic capacity of surface facility structures. According to the analysis results, since inspection & store facility and radioactive waste facility have a rectangle geometry, the seismic capacity was differently presented about 23%~43% according to the axis of structures. The HCLPF capacity of inspection & store facility and radioactive waste facility was 0.52g and 0.93g, respectively. And it was observed that seismic capacity of radioactive waste facility was similar to that of a containment for nuclear power plants.
Structural Analysis and Light-Weight Design of Aircraft Floats with Laminated Composites
Choi, Youn-Gyu ; Kim, Sung-Jun ; Shin, Eui-Sup ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 65~71
DOI : 10.7734/COSEIK.2012.25.1.065
In order to improve the structural safety and light-weight design of aircraft floats, natural frequency and static stress analysis are performed under water and ground landing conditions. A finite element mesh based on the design configuration of light aircraft floats is modeled, and simplified water and ground landing loads are applied to this model. The natural frequency and stress analysis of aluminum-alloy floats are carried out first. Then, the structural performance of the floats is re-analyzed in the case of laminated composites, and the numerical results are compared each other. It is concluded that, by tailoring the laminated composites with respect to stacking sequence and ply thickness, the structural safety of the light-weight floats can be improved.
Optimal Shape Design of Space Truss Structure using Topology Optimization and Cellular Automata Model
Kim, Ho-Soo ; Lee, Min-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 73~80
DOI : 10.7734/COSEIK.2012.25.1.073
It is important to design the optimal shape in the initial process because the influences on the design and construction are large according to the shape and pattern of spatial structures. However, the existing optimal shape designs for spatial structure are performed by the designer's intuition and experiences. Therefore, this study proposes the integrated process using the topology optimization and cellular automata model. First, the initial optimal shapes are obtained by using the topology optimization, and then the spatial truss structural patterns are created through the application of cellular automata rules. Finally, the optimal shapes to satisfy the various design conditions are generated by the structural analysis and size optimization.
Vibration-based Damage Monitoring Scheme of Steel Girder Bolt-Connection Member by using Wireless Acceleration Sensor Node
Hong, Dong-Soo ; Kim, Jeong-Tae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 81~89
DOI : 10.7734/COSEIK.2012.25.1.081
This study propose the vibration-based damage monitoring scheme for steel girder bolt-connection member by using wireless acceleration sensor node. In order to achieve the objective, the following approaches are implemented. Firstly, wireless acceleration sensor node is described on the design of hardware components and embedded operation software. Secondly, the vibration-based damage monitoring scheme of the steel girder bolt-connection member is described. The damage monitoring scheme performed global damage occurrence alarming and damage localization estimation by the acceleration response feature analysis. The global damage alarming is applied to the correlation coefficient of power spectral density. The damage localization estimation is applied to the frequency-based damage detection technique and the mode-shape-based damage detection technique. Finally, the performance of the vibration-based damage monitoring scheme is evaluated for detecting the bolt-connection member damage on a lab-scale steel girder.
Modal Strain Energy-based Damage Monitoring in Beam Structures using PZT's Direct Piezoelectric Response
Ho, Duc-Duy ; Lee, Po-Young ; Kim, Jeong-Tae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 91~99
DOI : 10.7734/COSEIK.2012.25.1.091
The main objective of this study is to examine the feasibility of using lead zirconate titanate (PZT)'s direct piezoelectric response as vibrational feature for damage monitoring in beam structures. For the purpose, modal strain energy (MSE)-based damage monitoring in beam structures using dynamic strain response based on the direct piezoelectric effect of PZT sensor is proposed in this paper. The following approaches are used to achieve the objective. First, the theoretical background of PZT's direct piezoelectric effect for dynamic strain response is presented. Next, the damage monitoring method that utilizes the change in MSE to locate of damage in beam structures is outlined. For validation, forced vibration tests are carried out on lab-scale cantilever beam. For several damage scenarios, dynamic responses are measured by three different sensor types (accelerometer, PZT sensor and electrical strain gage) and damage monitoring tasks are performed thereafter. The performance of PZT's direct piezoelectric response for MSE-based damage monitoring is evaluated by comparing the damage localization results from the three sensor types.
Comparison Study of An Improved Initial Force and TCUD Method for Initial Shape Analysis of Cable-Stayed Bridges
Kim, Dong-Yeong ; Jo, Kyeong-Sik ; Kim, Moon-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 101~108
DOI : 10.7734/COSEIK.2012.25.1.101
Initial shape analysis for cable-stayed bridges should be able to find optimizated initial cable forces and unstrained length that minimize deflection and bending moments of the deck and pylon. Comparison study of an improved initial force method and TCUD method for determination of initial cable forces in cable-stayed bridges is presented in this paper. For this purpose, an elastic catenary cable element and a nonlinear frame element are firstly described. And concepts and algorithm of two analysis methods are then presented. Finally to demonstrate the validity and the accuracy of two methods, numerical examples for initial state problems of cable-stayed bridges are given and compared based on these methods.
Detection of Manufacturing Defects in Stiffness of CFTA Girder using Static Loading
Kim, Doo-Kie ; Alfahdawi, Nathem ; Cui, Jintao ; Park, Kyung-Hoon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 1, 2012, Pages 109~116
DOI : 10.7734/COSEIK.2012.25.1.109
This paper presents a study on the nonlinear behavior of an innovative bridge girder made from concrete-filled and tied tubular steel arch (CFTA) under static loading. Manufacturing of the CFTA girder may have defects which may highly affect the symmetry and performance of the structure. A simple method is proposed by using stiffness extracted from static test data to detect manufacturing defects of the CFTA girder. A three-dimensional finite element model was used in the numerical analysis in order to verify the method. The proposed method was experimentally validated through static tests of the CFTA girder. The application of the proposed method showed that it is effective in identifying invisible manufacturing defects of the CFTA girder, especially for mass production of a standard type in the factory.