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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 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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Stress-diffusion Full Coupled Multiscale Simulation Method for Battery Electrode Design
Chang, Seongmin ; Moon, Janghyuk ; Cho, Kyeongjae ; Cho, Maenghyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 409~413
DOI : 10.7734/COSEIK.2013.26.6.409
In this paper, we device stress-diffusion full coupling multiscale analysis method for battery electrode simulation. In proposed method, the diffusive and mechanical properties of electrode material depend on Li concentration are estimated using density function theory(DFT) simulation. Then, stress-diffusion full coupling continuum formulation based on finite element method(FEM) is constructed with the diffusive and mechanical properties calculated from DFT simulation. Finally, silicon nanowire anode charge and discharge simulations are performed using the proposed method. Through numerical examples, the stress-diffusion full coupling method shows more resonable results than previous one way continuum analysis.
Life-Cycle Analysis of Nuclear Power Plant with Seismic Isolation System
Kim, Sunyong ; Lee, Hong-Pyo ; Cho, Myung-Sug ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 415~421
DOI : 10.7734/COSEIK.2013.26.6.415
In order to extend the service life of a nuclear power plant(NPP) ensuring the structural safety, effective and efficient management of NPP considering structural deteriorations and various natural hazard risks has been treated as a significant tool(IAEA 1998). The systemic efforts is required to prevent the potential loss of NPPs resulting from the natural hazard including earthquakes, hurricane and flooding since the Fukushima accident. Earthquake risk of building structures can be mitigated through appropriate seismic isolation system installation. It has been known that a seismic isolation system can lead to reduction of the deleterious effect on ground motion induced by earthquakes, and structural safety can be improved. In this paper, the NPP life-cycle management is reviewed. Furthermore, effect of seismic isolation on the NPP life-cycle cost analysis with earthquake, and cost-benefit analysis in terms of life-cycle cost when applying the seismic isolation systems to NPP are introduced.
A Study on the Prediction of Elastoplastic Behavior of Carbon Nanotube/Polymer Composites
Yang, Seunghwa ; Yu, Suyoung ; Ryu, Junghyun ; Cho, Maenghyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 423~430
DOI : 10.7734/COSEIK.2013.26.6.423
In this research, a paramteric study to account for the effect of interfacial strength and nanotube agglomeration on the elastoplastic behavior of carbon nanotube reinforced polypropylene composites is performed. At first, the elastoplastic behavior of nanocomposites is predicted from molecular dynamics(MD) simulations. By combining the MD simulation results with the nonlinear micromechanics model based on the Mori-Tanaka model, a two-step domain decomposition method is applied to inversely identify the elastoplastic behavior of adsorption interphase zone inside nanocomposites. In nonlinear micromechanics model, the secant moduli method combined with field fluctuation method is used to predict the elastoplastic behavior of nanocomposites. To account for the imperfect material interface between nanotube and matrix polymer, displacement discontinuity condition is applied to the micromechanics model. Using the elastoplastic behavior of the adsorption interphase zone obtained from the present study, stress-strain relation of nanocomposites at various interfacial bonding condition and local nanotube agglomeration is predicted from nonlinear micromechanics model with and without the adsorption interphase zone. As a result, it has been found that local nanotube agglomeration is the most important design factor to maximize reinforcing effect of nanotube in elastic and plastic behavior.
Application of Data Dictionary to BIM for Small and Medium Project
Lee, Hwan Woo ; Lee, Kyung Sub ; Kim, Kwang Yang ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 431~438
DOI : 10.7734/COSEIK.2013.26.6.431
The systemization of construction information is required over whole life cycle of facilities to improve productivity of construction industry. BIM(Building Information Modeling) is a technology to manage information based on 3D information model. It has been actively suggested as one of the alternatives. However, it may be currently concentrated on the large project while the small and medium project based on BIM are slightly treated in indifference. In the case of small and medium project, the loss of information has been occurred more seriously than large project. However, it is hard to introduce BIM to the small and medium companies due to the lack of investment resources. This study has been performed to set up information management system based on BIM considering characteristics of small and medium project without excessive investment. In this study, pseudo BIM is defined as BIM for small and medium project. The concept of pseudo BIM has been suggested. The PLIB of ISO and construction information classification system of MOLIT in Korea are used to construct data dictionary for pseudo BIM. A pilot test is performed to verify the effectiveness of pseudo BIM.
Large-scale 3D SSI Analysis using KIESSI-3D Program
Lee, Eun-Haeng ; Kim, Jae-Min ; Seo, Choon-Gyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 439~445
DOI : 10.7734/COSEIK.2013.26.6.439
The soil-structure interaction(SSI) effect should be considered to accurately assess the seismic response of structure constructed on soft soil site other than the hard bedrock. Recently, the demand of SSI analysis has increased due to strengthening of the regulatory guidelines of nuclear power plant such as the USNRC SRP 3.7.2. In this study an accuracy and running time of the KIESSI-3D program for large-scale 3D SSI analysis were investigated. The seismic SSI analysis using the KIESSI-3D program was performed for several examples of large-scale three-dimensional soil-structure interaction system. The analysis results were compared with those of the ACS/SASSI program. Good agreements in transfer functions at selected locations showd that KIESSI-3D yields accurate solution for large-scale SSI problem. Moreover, it was found that running speed of the KIESSI-3D for large-scale 3D SSI analysis is much faster than that of the ACS/SASSI about 30~2000 times.
Model-based Diagnosis for Crack in a Gear of Wind Turbine Gearbox
Leem, Sang Hyuck ; Park, Sung Hoon ; Choi, Joo Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 447~454
DOI : 10.7734/COSEIK.2013.26.6.447
A model-based method is proposed to diagnose the gear crack in the gearbox under variable loading condition with the objective to apply it to the wind turbine CMS(Condition Monitoring System). A simple test bed is installed to illustrate the approach, which consists of motors and a pair of spur gears. A crack is imbedded at the tooth root of a gear. Tachometer-based order analysis, being independent on the shaft speed, is employed as a signal processing technique to identify the crack through the impulsive change and the kurtosis. Lumped parameter dynamic model is used to simulate the operation of the test bed. In the model, the parameter related with the crack is inversely estimated by minimizing the difference between the simulated and measured features. In order to illustrate the validation of the method, a simulated signal with a specified parameter is virtually generated from the model, assuming it as the measured signal. Then the parameter is inversely estimated based on the proposed method. The result agrees with the previously specified parameter value, which verifies that the algorithm works successfully. Application to the real crack in the test bed will be addressed in the next study.
Seismic Performance Evaluation of RC Structure Strengthened by Steel Grid Shear Wall using Nonlinear Static Analysis
Park, Jung Woo ; Lee, Jae Uk ; Park, Jin Young ; Lee, Young Hak ; Kim, Heecheul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 455~462
DOI : 10.7734/COSEIK.2013.26.6.455
The effects of earthquakes can be devastating especially to existing structures that are not based on earthquake resistant design. This study proposes a steel grid shear wall that can provide a sufficient lateral resistance and can be used as a seismic retrofit method. The pushover analysis was performed on RC structure with and without the proposed steel grid shear wall. Obtain the performance point that the target structure for seismic loads applied to evaluate the response and performance levels. The capacity spectrum at performance point is nearly elastic range, so satisfied the performance objectives(LS level). And response modification factor(R factor) were calculated from the pushover analysis. The R factor approach is currently implemented to reflect inelastic ductile behavior of the structures and to reduce elastic spectral demands from earthquakes to the design level. The R factor increases from 2.17 to 3.25 was higher than the design criteria. As a result, according to reinforcement by steel grid shear wall, strength, stiffness, and ductility of the low-rise RC structure has been appropriately improved.
Simplified 2D Analysis for Suspension Bridges Subject to Wind Excitation
Kim, Woo Seok ; Lee, Jaeha ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 463~470
DOI : 10.7734/COSEIK.2013.26.6.463
In this paper, 2D simple analyses were performed in order to predict the large torsional oscillations in a suspension bridge based on Makenna and Tuama model(2001). The existing model(Makenna and Tuama, 2001) has shown unrealistic results as the wind speed increases and frequency decreases. Furthermore, resonance could not be simulated by the existing model. Therefore, in this study, new model was proposed with a consideration of the torsional resistance. The vertical and rotational behaviors of the deck in the suspension bridge were analyzed. Analysis results showed that at first vertical oscillations were observed and it was gradually transformed to the rotation oscillations. With the consideration of the torsional resistance, it was shown that vertical behavior were stabilized as time passed. However, the rotational behavior was not stabilized and was kept until the end of analysis. Beat periods decreased while the wind speed increased. The resonance of the rotational mode was dependent to the rotational resistance. Obtained results could be applied for the design of the suspension bridge under the wind load.
Surgical Evaluation of Endodontic Treatments for Apicoectomy According to Alveolar Bone Resorption Types
Hong, Hyoung Taek ; Chun, Heoung Jae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 471~474
DOI : 10.7734/COSEIK.2013.26.6.471
The surgical evaluation of the apicoectomy with various types of alveolar bone resorption was conducted in current study. The apicoectomy is the common and important treatment in endodontics. Finite element analysis was used for evaluation. The 3D solid model of the maxillary central incisor was reconstructed using CT images of a mature Asian female. Loading and boundary conditions were simulated in the normal mastication of maxillary central incisor. For evaluation of apicoectomy, lingual, labial and entire alveolar bone resorption models were developed. In the results, lingual alveolar bone resorption did not significantly influence stress distribution pattern of root dentin and labial alveolar bone had an important role for supporting structural stability in tooth system.
Thermal Residual Stresses and Spring back Effects on the Frequency Selective Surface Embedded Composite Laminates
Park, Kyoung-Mi ; Seo, Yun-Seok ; Chun, Heoung-Jae ; Hong, Ic-Pyo ; Park, Yong-Bae ; Kim, Yun-Jae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 26, issue 6, 2013, Pages 475~481
DOI : 10.7734/COSEIK.2013.26.6.475
The residual stresses occur in the Frequency Selective Surface(FSS) embedded hybrid composite structures after co-curing due to mismatch among the coefficient of thermal expansions and stiffness values between the FSS and composite materials. The spring backs occur due to these residual stresses. Therefore, in this paper, the spring-backs caused by residual stresses in FSS embedded composite structures were studied with considering effect of symmetric and unsymmetric stacking sequence of composite laminates.