Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Computational Structural Engineering Institute of Korea
Journal Basic Information
Journal DOI :
The Computational Structural Engineering Institute
Editor in Chief :
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
Selecting the target year
Calculation of the Dynamic Contact Force between a Shipbuilding Block and Wire Ropes of a Goliath Crane for the Optimal Lug Arrangement
Ku, Nam-Kug ; Roh, Myung-Il ; Cha, Ju-Hwan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 375~380
DOI : 10.7734/COSEIK.2012.25.5.375
In this study, dynamic load and dynamic contact force between a building block and wire ropes of a goliath crane are calculated during lifting or turn-over of a building block for the design of an optimal lug arrangement system. In addition, a multibody dynamics kernel for implementing the system were developed. In the multibody dynamics kernel, the equations of motion are constructed using recursive formulation. To evaluate the applicability of the developed kernels, the interferences and dynamic contact force between the building block and wire ropes were calculated and then the hull structural analysis for the block was performed using the calculation result.
Seismic Fragility Analysis for Steel Fiber Applicability Assessment for Containment Structure of Nuclear Power Plant
Kim, Min Kyu ; Park, Junhee ; Choun, Young-Sun ; Choi, In-Kil ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 381~388
DOI : 10.7734/COSEIK.2012.25.5.381
In this study, a seismic risk analysis performed for an applicability assessment of steel fiber in containment structures. Steel fiber can increase tensile properties of concrete structures moreover compressive and shear capacity. But many of researches about steel fiber reinforced concrete structures are now only focused in axial load condition. Also it is very difficult to find an effort for application to containment structures in NPP. Therefore, in this study, seismic fragility assessment for a steel fiber reinforced concrete containment structure. As a result, a seismic fragility capacity improved according to increase of shear and ductile capacity of concrete. In the case of 1.0% of steel fiber volume fraction, seismic capacity increases as 10%. But very limited previous experimental results were used in this study, so various element tests were needed for more accurate investigation.
Virtual City System Based on 3D-Web GIS for U-City Construction
Jo, Byung-Wan ; Lee, Yun-Sung ; Yoon, Kwang-Won ; Park, Jung-Hun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 389~395
DOI : 10.7734/COSEIK.2012.25.5.389
U-City has been promoted nation-wide by development of recent IT technology. This paper studied the concept of 3D-virtual city in order to realize the current Ubiquitous City(U-City) efficiently, and to manage all the RFID/USN monitoring data in the real U-City. 3D-Virtual City is the concept of the reproduction of real world U-City, for embodying Ubiquitous technology while using Digital map, satellite image, VRML(Virtual Reality Modeling Language). U&V-City is the four-dimensional future city that real-time wire/wireless communication network and 3D-web GIS shall be connected that massive database, intelligent service be perceived through employing EAI(External Authoring Interface) that provides HTML&JAVA, and interface for efficient removal/process of massive information/ service and also by employing GPS/LBS/Navigation in support of world-wide orientation concept, and RTLS(Real Time Location System).
Fragility Analysis of Staggered Wall Structures
Beak, Donggirl ; Kwon, Kwangho ; Kim, Jinkoo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 397~404
DOI : 10.7734/COSEIK.2012.25.5.397
Fragility curves show the probability of a system reaching a limit state as a function of some measure of seismic intensity. To obtain fragility curves of six and twelve story staggered wall structures with middle corridor, incremental dynamic analyses were carried out using twenty two pairs of earthquake records, and their failure probabilities for various intensity of seismic load were investigated. The performances of staggered wall structures with added columns along the central corridor and the structures with their first story walls replaced by columns were compared with those of the regular staggered wall structures. Based on the analysis results it was concluded that staggered wall structures with central columns have the largest safety margin for the same level of seismic load.
Numerical Simulation of Bullet Impact for Fuel Cell of Rotorcraft
Kim, Hyun-Gi ; Kim, Sung Chan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 405~411
DOI : 10.7734/COSEIK.2012.25.5.405
Inside a rotorcraft fuel cell, pipes and components are located for fuel storage and fuel supply into the engine. Utility helicopters, operated in battle fields, fly at lower altitude compared to fixed-wing aircraft and hence are more likely to be exposed to gunfire. Since internal pressure of fluid increases when hit, the effect on LRU due to increase in pressure must taken into account when designing the aircraft for survivability. However, it is costly and time consuming to manufacture a fuel cell for gunfire test, and due to constraints from usage of live ammunition, related data gathered through numerical simulation is needed. In this study, numerical simulation on rotorcraft fuel cell exposed to gunfire was carried out using Autodyn to analyze bullet movement inside the fuel cell after hit, and internal pressure of fluid and equivalent stress on fuel cell assessed.
Kernel Integration Scheme for 2D Linear Elastic Direct Boundary Element Method Using the Subparametric Element
Jo, Jun-Hyung ; Park, Yeongmog ; Woo, Kwang-Sung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 413~420
DOI : 10.7734/COSEIK.2012.25.5.413
In this study, the Kernel integration scheme for 2D linear elastic direct boundary element method has been discussed on the basis of subparametric element. Usually, the isoparametric based boundary element uses same polynomial order in the both basis function and mapping function. On the other hand, the order of mapping function is lower than the order of basis function to define displacement field when the subparametric concept is used. While the logarithmic numerical integration is generally used to calculate Kernel integration as well as Cauchy principal value approach, new formulation has been derived to improve the accuracy of numerical solution by algebraic modification. The subparametric based direct boundary element has been applied to 2D elliptical partial differential equation, especially for plane stress/strain problems, to demonstrate whether the proposed algebraic expression for integration of singular Kernel function is robust and accurate. The problems including cantilever beam and square plate with a cutout have been tested since those are typical examples of simple connected and multi connected region cases. It is noted that the number of DOFs has been drastically reduced to keep same degree of accuracy in comparison with the conventional isoparametric based BEM. It is expected that the subparametric based BEM associated with singular Kernel function integration scheme may be extended to not only subparametric high order boundary element but also subparametric high order dual boundary element.
Structural Design of a Dental Implant (I): Comparative Structural Analysis
Kwon, Young-Joo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 421~432
DOI : 10.7734/COSEIK.2012.25.5.421
This paper is the first paper among two papers which constitute the paper about the structural design of a dental implant. This paper surveyed types and characteristics of dental implants. Merits and shortcomings of clinically used dental implants were analysed through this survey. A new structural model of dental implant was proposed on the basis of survey results. Especially, a comparative structural analysis of the new dental implant and the well known dental implants has been performed using the finite element analysis method. The analysis results confirm that the newly proposed dental implant has a good structural performance. The well known dental implants used for the comparative structural analysis are 3i implant and Sargon implant. These implants are imported dental implants and we could know that most implants clinically used are endosteal implants and these two implants(3i implant and Sargon implant) are also endosteal implants.
Structural Design of a Dental Implant (2): Test Drafting and Manufacturing
Kwon, Young-Joo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 433~438
DOI : 10.7734/COSEIK.2012.25.5.433
This paper is the second paper among two papers which constitute the paper about the structural design of a dental implant. This paper completed the test drafting for the structural model of the new dental implant whose structural performance was confirmed and verified through the comparative structural analysis carried out in the first paper. This paper finished the structural design of a dental implant by manufacturing the dental implant using CNC machines and so forth on the basis of the completed draft and finally by evaluating the machining condition of the dental implant. The drafting work was performed using MDT(Mechanical Desk Top). The manufacturing work was carried out using CNC machines, general purpose milling machine, and Wire EDM. The manufactured surface condition of the dental implant was evaluated and confirmed finally using an electron microscope. As a result of evaluation, a testing dental implant with very good condition was designed and manufactured.
Implicit Moving Least Squares Difference Method for 1-D Moving Boundary Problem
Yoon, Young-Cheol ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 439~446
DOI : 10.7734/COSEIK.2012.25.5.439
This paper presents an implicit moving least squares(MLS) difference method for improving the solution accuracy of 1-D free boundary problems, which implicitly updates the topology change of moving interface. The conventional MLS difference method explicitly updates the moving interface; it requires no iterative solution procedure but results in the loss of accuracy. However, the newly developed implicit scheme makes the total system nonlinear involving iterative solution procedure, but numerical verification show that it dramatically elevates the solution accuracy with moderate computation increase. Through numerical experiments for melting problems having moving singularity, it is verified that the proposed method can achieve the second order accuracy.
A Study on the Dynamic Analysis of One-way Hollow Slab Using Equivalent Plate Element
Kang, Joo-Won ; Lim, Jun-Ho ; Chae, Seoung-Hun ; Kim, Gee-Cheol ; Seok, Keun-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 447~454
DOI : 10.7734/COSEIK.2012.25.5.447
Considering that the weight of a hollow slab system is not increased with an incremental increase in its thickness, and that the flexural stiffness of a hollow slab is not significantly lower than that of a general slab, there has been a growing need for hollow slab system, because long span structures are in great demand. In a long span structure, the problem of vibration of floor slabs frequently occurs, and the dynamic characteristics of a hollow slab system are quite different from the conventional floor system. It is required to investigate the safety and the serviceability of hollow slab. Therefore, there exists a necessity for accurate vibration analysis. Hollow slab should be modeled by refined mesh for accurate vibration analysis. For the efficiency of the Eigenvalue Analysis, an equivalent plate slab model when can relatively precisely represent the dynamic behavior of a one-way hollow slab system is used. In conclusion, equivalent plate models relatively precisely presented the dynamic characteristics of one-way hollows.
Dynamic Constrained Force of Tower Top and Rotor Shaft of Floating Wind Turbine
Ku, Nam-Kug ; Roh, Myung-Il ; Lee, Kyu-Yeul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 25, issue 5, 2012, Pages 455~463
DOI : 10.7734/COSEIK.2012.25.5.455
In this study, we calculate dynamic constrained force of tower top and blade root of a floating offshore wind turbine. The floating offshore wind turbine is multibody system which consists of a floating platform, a tower, a nacelle, and a hub and three blades. All of these parts are regarded as a rigid body with six degree-of-freedom(DOF). The platform and the tower are connected with fixed joint, and the tower, the nacelle, and the hub are successively connected with revolute joint. The hub and three blades are connected with fixed joint. The recursive formulation is adopted for constructing the equations of motion for the floating wind turbine. The non-linear hydrostatic force, the linear hydrodynamic force, the aerodynamic force, the mooring force, and gravitational forces are considered as external forces. The dynamic load at the tower top, rotor shaft, and blade root of the floating wind turbine are simulated in time domain by solving the equations of motion numerically. From the simulation results, the mutual effects of the dynamic response between the each part of the floating wind turbine are discussed and can be used as input data for the structural analysis of the floating offshore wind turbine.