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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 19, Issue 4 - Dec 2006
Volume 19, Issue 3 - Sep 2006
Volume 19, Issue 2 - Jun 2006
Volume 19, Issue 1 - Mar 2006
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Behaviors of Laminated Composite Folded Structures According to Ratio of Folded Length
Yoo Yong-Min ; Yhim Sung-Soon ; Chang Suk-Yoon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 223~231
This study deals with behavior characteristics of laminated composite folded structures according to ratio of folded length based on a higher-order shear deformation theory. Well-known mixed finite element method using Lagrangian and Hermite shape interpolation functions is a little complex and have some difficulties applying to a triangular element. However, a higher-order shear deformation theory using only Lagrangian shape interpolation functions avoids those problems. In this paper, a drilling degree of freedom is appended for more accurate analysis and computational simplicity of folded plates. There are ten degrees of freedom per node, and four nodes per element. Journal on folded plates for effects of length variations is not expressed. Many results in this study are carried out according to ratio of folded length. The rational design is possible through analyses of complex and unpredictable laminated composite folded structures.
Semi-Active Control System Based on the Experimental Results of the Performance of a Small Scale MR Damper
Min Kyung-Won ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 233~238
In this paper, mixed mode magneto-rheological(MR) damper, which is applicable for vibration control of a small scale multi-story structure, is devised. First, the schematic configurations of the shear, flow, and mixed mode MR dampers are described with design constraints and then the analytical models to predict the field-dependent damping forces are derived for each type. Second, an appropriate size of the mixed mode MR damper is manufactured and its field-dependent damping characteristics are evaluated in time domain. Finally, the performance of the manufactured MR damper which is semi-actively applied to a small scale building excited by earthquake load, is numerically evaluated.
Seismic Response Control of a Building Structure Using Toggle-Brace System with an MR Damper
Lee Sang-Hyun ; Hwang Jae-Seung ; Min Kyung-Won ; Lee Myoung-Kyu ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 239~245
In this paper, the performance of a toggle brace-MR damper system is evaluated for the control of the structure excited by earthquake load and the non-linearity of the toggle system is investigated. Considering that the control force of MR damper described by Bingham model is a function of velocity, velocity amplification factor by the toggle brace system is calculated and the effect of toggle configuration on the amplification factor is also evaluated. Numerical results show that the control performance can be largely enhanced using toggle brace system especially for the case that the MR damper installed with conventional brace system such as Chevron and diagonal cannot provide enough control force under severe earthquake load.
Free Vibration Analysis of Perforated Shell Submerged in Fluid
Jhung Myung-Jo ; Jo Jong-Chull ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 247~258
For the perforated cylindrical shell submerged in fluid, it is almost impossible to develop a finite element model due to the necessity of the fine meshing of the shell and the fluid at the same time. This necessitates the use of solid shell with equivalent material properties. Unfortunately the effective elastic constants are not found in any references even though the ASME code is suggesting those for perforated plate. Therefore in this study the equivalent material properties of perforated shell are suggested by performing several finite element analyses with respect to the ligament efficiencies.
Numerical Analysis of Viscoelastic Cylinders with Mode I Cracks
Sim Woo-Jin ; Oh Guen ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 259~269
In this paper, the stress intensity factor, energy release rate and crack opening displacement are computed using the finite element method for axisymmetric viscoelastic cylinders with the penny-shaped and circumferential cracks. The triangular elements with quarter point nodes are used to describe the stress singularity around the crack edge. The analytical solutions are also derived by using the elastic-viscoelastic correspondence principle and compared with the numerical results to show the validity and accuracy of the presented method. Viscoelastic materials are assumed to behave elastically in dilatation and like a three-parameter standard linear solid.
Analysis Models of Concrete Slabs-on-Grade Considering Horizontal Resistance at Slab Bottom and Behavior under Thermal Loads
Kim Seong-Min ; An Zu-Og ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 271~282
The behavior of the concrete slabs on grade considering the horizontal resistance at the slab bottom, which exists due to the shear resistance of the foundation and the friction between the slab and the foundation, has been investigated when the slabs-on-grade are subjected to the thermal load. Analytical formulations have been developed to include the effect of the horizontal resistance at the slab bottom employing the thin plate on an elastic foundation that is widely used for the analysis of concrete slabs-on-grade and rigid pavement systems. Finite element formulations have then been developed using the plate bending elements and the flat shell elements. The solutions from the analytical and numerical models have been compared and showed very good agreement. The sensitivity of the horizontal resistance to the stresses of the concrete slab has been investigated with various values of the slab thickness, elastic modulus, and vortical stiffness of the foundation when subjected to the temperature gradient between the top and bottom of the slab and the uniform temperature drop throughout the slab depth. The analysis results show that the horizontal resistance at the plate bottom can significantly affect the stresses of the slab when the thermal loads are applied.
Development of Structural Analysis and Pre-post Program for Mega Frame System
Kim Hyun-Su ; Lee Dong-Guen ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 283~293
Recently, various types of structural systems for skyscrapers are studied as the height and size of the building structures rapidly increase due to social and economical needs. The mega frame system among them, which is the structural system developed recently, is known as a suitable structural system for skyscrapers because this structural system has sufficient stiffness against the lateral forces by combination of mega members which consist of many columns and girders. Since the mega frame structure has significant numbers of elements and nodes, it takes tremendous times and computer memories to analyze and design the structures. Therefore, the exclusive structural analysis program for mega frame system is developed to reduce the efforts and time required for the analysis and design of mega frame structure. To this end, an efficient modelling technique using the characteristics of mega frame structures and an efficient analytical model, which uses a few DOFs selected by the user using the matrix condensation method, are developed in this study. Static and dynamic analyses are conducted using an example structure. The effectiveness and accuracy of the developed program we verified by the comparison between the results of the proposed method and the conventional method.
Computational Structural Dynamic Analysis of a Gyrocopter Using CFD Coupled Method
Kim Hyun-Jung ; Jung Se-Un ; Park Hyo-Keun ; Yang Chang-Hak ; Kim Dong-Hyun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 295~302
In this study, computational structural dynamic analyses of a gyrocopter have been conducted considering unsteady dynamic hub-loads due to rotating blades. 3D CATIA models with detailed mechanical parts we constructed and virtually assembled into the complete aircraft configuration. The dynamic loading generated by rotating blades in the forward flight condition are calculated by a commercial computational fluid dynamics (CFD) code such as FLUENT. Modal based transient and frequency response analyses are used to efficiently investigate vibration characteristics of the gyrocopter. Free vibration analysis results for different fuel and pilot conditions, frequency responses and transient responses for critical flight conditions are also presented in detail.
Definition and Application of Equivalent Load for Stiffness
Kim Chee-Kyeong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 303~312
This paper presents the equivalent nodal load for the element stiffness which represents the influence of the stiffness change such as the addition of elements, the deletion of elements, and/or the partial change of element stiffness. The reanalysis of structure using the equivalent load improves the efficiency very much because the inverse of the structural stiffness matrix, which needs a large amount of computation to calculate, is reused in the reanalysis. In this paper, the concept of the equivalent load for the element stiffness is described and some numerical examples are provided to verify it.
Improved Genetic Algorithm-Based Damage Detection Technique Using Natural Frequency and Modal Strain Energy
Park Jae-Hyung ; Ryu Yeon-Sun ; Yi Jin-Hak ; Kim Jeong-Tae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 19, issue 3, 2006, Pages 313~322
In the genetic algoricm (GA) based damage detection methods using vibration of structures, the selection of modal properties is important to improve the accuracy of damage detection. The objective of this study is to improve the accuracy of damage detection using natural frequency and modal strain energy, The following approaches are used to achieve the goal. First, modal strain energy is formulated and a new GA-based damage detection technique using natural frequency and modal strain energy is proposed. Next, to verify the efficiency of proposed technique, damage scenarios for free-free beam are designed and vibration modal tests of the target structure are conducted. Finally, the feasibility of the proposed technique is verified in comparison with other GA-based damage detection technique using natural frequency and mode shape.