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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
Journal Basic Information
Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 26, Issue 6 - Dec 2013
Volume 26, Issue 5 - Oct 2013
Volume 26, Issue 4 - Aug 2013
Volume 26, Issue 3 - Jun 2013
Volume 26, Issue 2 - Apr 2013
Volume 26, Issue 1 - Feb 2013
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Structural Design and Analysis of a Hydraulic Coiling Arm for Offshore Wind-turbine Submarine Cable
Kim, Myung-Hwan ; Kim, Dong-Hyun ; Oh, Min-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 1~7
DOI : 10.7734/COSEIK.2013.26.1.1
Structural design and analysis of a coiling arm unloading machine for submarine cable have been originally conducted in this study. Three-dimensional CAD modeling process is practically applied for the structural design in detail. Finite element method(FEM) and multi-body dynamics(MBD) analyses are also used to verify the safety and required motions of the designed coiling arm structure. The effective moving functions of the designed coiling arm with respect to rotational and radial motions are achieved by adopting bearing-roller mechanical parts and hydraulic system. Critical design loading conditions due to its self weight, carrying cables, offshore wind, and hydraulic system over operation conditions are considered for the present structural analyses. In addition, possible inclined ground conditions for the installation of the designed coiling arm are also considered to verify overturn stability. The present hydraulic type coiling arm system is originally designed and developed in this study. The developed coiling arm has been installed at a harbor, successfully tested its operational functions, and finished practical unloading mission of the submarine cable.
Development of Efficient Seismic Analysis Model using 2D T-Shape Rigid-body for Wall-Frame Structures with a Central Core
Park, Yong-Koo ; Lee, Dong-Guen ; Kim, Hyun-Su ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 9~17
DOI : 10.7734/COSEIK.2013.26.1.9
In this study, an efficient analytical model for the dynamic analysis of tall buildings with a shear wall-frame structural system has been proposed. A shear wall-frame structural system usually consists of a core wall showing flexural behavior and a frame presenting shear behavior. Therefore, the deformed shape of the shear wall-frame structural system is shown by the combination of flexural mode and shear mode. These characteristics should be considered when an efficient analytical model is developed. To this end, the effect of shear wall and frame on the dynamic behavior of a tall building with a dual system has been separately investigated. In this study, the structural characteristics of a separated individual shear wall model and the frame model without shear wall has been evaluated. In order to consider the effect of the shear wall in the frame model without shear wall, a rigid body was used instead of the shear wall. Each equivalent model for the separated shear wall part and frame part has been independently developed and two equivalent models were then combined to create an efficient analytical model for tall buildings with a shear wall-frame structural system. In order to verify the efficiency and accuracy of the proposed method, time history analyses of tall buildings with a shear wall-frame system were performed. Based on analytical results, it has been confirmed that the proposed method can provide accurate results, requiring significantly reduced computational time and memory.
Development of Efficient Seismic Analysis Model using 3D Rigid-body for Wall-Frame Structures with an Eccentric Core
Park, Yong-Koo ; Lee, Dong-Guen ; Kim, Hyun-Su ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 19~28
DOI : 10.7734/COSEIK.2013.26.1.19
In a shear wall-frame structural system, the structural response is determined by the interaction between the shear wall in bending mode and the frame in shear mode. In order to effectively consider these characteristics of a shear wall-frame structure, the simplified numerical model using the T-shape rigid body was suggested in the previous study. Based on the previously proposed model, an efficient numerical model for a wall-frame structure with an eccentric core has been proposed in this study. To this end, the previously proposed 2D model is extended to the 3D model and it is enhanced by considering torsion effects. As a result, the enhanced model can be applied to the analysis of a wall-frame structure with an eccentric core as well as a centric core.
Geometrical Non-linear Analyses of Tapered Cantilever Column Subjected to Sub-tangential Follower Force
Lee, Byoung-Koo ; Oh, Sang-Jin ; Lee, Tae-Eun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 29~38
DOI : 10.7734/COSEIK.2013.26.1.29
This paper deals with geometrical non-linear analyses of the tapered cantilever column subjected to the sub-tangential follower force at the free end. Cross-sections of the column whose flexural rigidities are functionally varied with the axial coordinate. The differential equations governing the elastica of such column are derived on the basis of the large deformation theory. These differential equations have three unknown parameters of the vertical and horizontal deflections and rotation at the free end. These differential equations are numerically solved by the iteration technique for obtaining three unknowns and elastica of the deformed column. For validating theories developed herein, laboratory scaled experiments are conducted.
Moving Least Squares Difference Method for the Analysis of 2-D Melting Problem
Yoon, Young-Cheol ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 39~48
DOI : 10.7734/COSEIK.2013.26.1.39
This paper develops a 2-D moving least squares(MLS) difference method for Stefan problem by extending the 1-D version of the conventional method. Unlike to 1-D interfacial modeling, the complex topology change in 2-D domain due to arbitrarily moving boundary is successfully modelled. The MLS derivative approximation that drives the kinetics of moving boundary is derived while the strong merit of MLS Difference Method that utilizes only nodal computation is effectively conserved. The governing equations are differentiated by an implicit scheme for achieving numerical stability and the moving boundary is updated by an explicit scheme for maximizing numerical efficiency. Numerical experiments prove that the MLS Difference Method shows very good accuracy and efficiency in solving complex 2-D Stefan problems.
Basic Design for Earthquake Resistance of Typical Bridges
Kook, Seung-Kyu ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 49~57
DOI : 10.7734/COSEIK.2013.26.1.49
Structural elements of typical bridges are superstructure, connections, substuctures and foundations and earthquake resistance is decided with the failure mechanism formed by substuctures and connections. Therefore earthquake resistant design should be carried out in the basic design step where design strengths, e.g. design sections for structural elements are determined. The Earthquake Resistant Design Part of Korean Roadway Bridge Design Code provides two basic design procedures. The first conventional procedure applies the Code-provided response modification factors. The second new procedure is the ductility-based earthquake resistant design, where designer can determine the response modification factors. In this study, basic designs including the two design processes are carried out for a typical bridge and supplements are identified in view of providing earthquake resistance.
Seismic Performance-based Design using Computational Platform for Structural Design of Complex-shaped Tall Building
Lee, Dong-Hun ; Cho, Chang-Hee ; Youn, Wu-Seok ; Kang, Dae-Eon ; Kim, Taejin ; Kim, Jong-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 59~67
DOI : 10.7734/COSEIK.2013.26.1.59
Complex-shaped tall building causes many structural challenges due to its structural characteristics regarding inclined members and complexed shape. This paper is aimed at development of design process using computational-platform which is effective design tool for responding frequent design changes, particularly as to overseas projects. StrAuto, a parametric structural modeling and optimizing system, provides the optimized alternatives according to design intent and realize a swift process converting a series of structural information necessary to nonlinear analytical models. The application of the process was to a 45-story hotel building in Ulanbator, Mongolia adopting shear wall and special moment frame with outrigger systems. To investigate the safety of lateral force resisting system against maximum considered earthquake(MCE), nonlinear response history analysis was conducted using StrAuto.
Multi-objective Integrated Optimization of Diagrid Structure-smart Control Device
Kim, Hyun-Su ; Kang, Joo-Won ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 69~77
DOI : 10.7734/COSEIK.2013.26.1.69
When structural design of a tall building is conducted, reduction of wind-induced lateral displacement is one of the most important problem. For this purpose, additional dampers and vibration control devices are generally considered. In this process, control performance of additional devices are usually investigated for optimal design without variation of characteristics of a structure. In this study, multi-objective integrated optimization of structure-smart control device is conducted and possibility of reduction of structural resources of a tall building with additional smart damping device has been investigated. To this end, a 60-story diagrid building structure is used as an example structure and artificial wind loads are used for evaluation of wind-induced responses. An MR damper is added to the conventional TMD to develop a smart TMD. Because dynamic responses and the amount of structural material and additional smart damping devices are required to be reduced, a multi-objective genetic algorithm is employed in this study. After numerical simulation, various optimal designs that can satisfy control performance requirement can be obtained by appropriately reducing the amount of structural material and additional smart damping device.
Isogeometric Topological Shape Optimization of Structures using Heaviside Enrichment
Ahn, Seung-Ho ; Cho, Seonho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 79~87
DOI : 10.7734/COSEIK.2013.26.1.79
An isogeometric topological shape optimization method is developed using the level sets and Heaviside enrichments. In the level set method, the initial domain is kept fixed and its boundary is represented by an implicit moving boundary embedded in the level set functions, which facilitates to handle complicated topological shape changes. The Heaviside enrichment improves the isogeometric analysis by adding some enrichment functions to model the internal boundaries. The proposed topological shape optimization method has several benefits: exact geometric models can be obtained using the isogeometric approach and the limitation of tensor-product patches can be overcome using the Heaviside enrichments to represent the internal voids. Even in a single patch, discontinuous displacement fields as well as smooth stress field can be obtained. Since the level sets offer the implicit moving boundary inside the domain, it is easy to represent the topological shape variations in the isogeometric analysis using Heaviside enrichments.
Applications of Construction Sequence Analyses to Prototype Models of Twisted Tall Buildings
Choe, Mi-Mi ; Kim, Jae-Yo ; Eom, Tae-Sung ; Jang, Dong-Woon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 1, 2013, Pages 89~97
DOI : 10.7734/COSEIK.2013.26.1.89
With regard to complex-shaped tall buildings whose plans and constructions have been gradually on the increase, this study was aimed to analyze their structural behaviors during construction by applications of construction sequences analyses to prototype models. For twisted tall buildings, total 18 models of with three conditions of a lateral load-resisting system, a twisting angle, and a construction method were selected. A diagrid system and a braced tube system were applied as a lateral load-resisting system. For each lateral load-resisting system, three types of plan with
twisting angles and three construction methods with construction sequences of exterior tube and interior frame were assumed. The structural performances of tall buildings under constructions were analyzed with results of lateral displacements from construction sequence analyses. Also, construction performances of the construction period and the maximum lift weight were compared.