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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Advanced Composite Structures
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Journal DOI :
Korean Society for Advanced Composite Structures
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Volume & Issues
Volume 2, Issue 4 - Dec 2011
Volume 2, Issue 3 - Sep 2011
Volume 2, Issue 2 - Jun 2011
Volume 2, Issue 1 - Mar 2011
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Continuum Based Plasticity Models for Cubic Symmetry Lattice Materials Under Multi-Surface Loading
Seon, Woo-Hyun ; Hu, Jong-Wan ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 1~11
DOI : 10.11004/kosacs.2011.2.3.001
The typical truss-lattice material successively packed by repeated cubic symmetric unit cells consists of sub-elements (SE) proposed in this study. The representative continuum model for this truss-lattice material such as the effective strain and stress relationship can be formulated by the homogenization procedure based on the notation of averaged mechanical properties. The volume fractions of micro-scale struts have a significant influence on the effective strength as well as the relative density in the lattice plate with replicable unit cell structures. Most of the strength contribution in the lattice material is induced by axial stiffness under uniform stretching or compression responses. Therefore, continuum based constitutive models composed of homogenized member stiffness include these mechanical characteristics with respect to strength, internal stress state, material density based on the volume fraction and even failure modes. It can be also recognized that the stress state of micro-scale struts is directly associated with the continuum constitutive model. The plastic flow at the micro-scale stress can extend the envelope of the analytical stress function on the surface of macro-scale stress derived from homogenized constitutive equations. The main focus of this study is to investigate the basic topology of unit cell structures with the cubic symmetric system and to formulate the plastic models to predict pressure dependent macro-scale stress surface functions.
An Experimental Study on Static Behaviors of Composite Sandwich Bridge Decks with Hybrid GFRP-Steel Core
Ji, Hyo-Seon ; Chun, Kyung-Sik ; Park, Dae-Yong ; Son, Byung-Jik ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 12~17
DOI : 10.11004/kosacs.2011.2.3.012
This paper presents the flexural behavior of a hybrid Glass Fiber-Reinforced Polymer(GFRP)-steel decks for use in deteriorated bridge decks replacement. Static load tests were conducted to investigate the structural characteristics of the hybrid FRP-steel deck. The tested deck panel satisfied the design criteria. The failure mode of the hybrid deck was demonstrated ductility with deformation beyond initial yielding. The responses were compared with the ANSYS finite element predictions. It was found that the presented hybrid deck was efficient for use in bridges. The thickness of the hybrid deck may be decreased when compared to that of the all FRP deck with similar flexural rigidity.
Pipe Stiffness Prediction of GRP Flexible Pipe
Lee, Young-Geun ; Kim, Sun-Hee ; Park, Joon-Seok ; Yoon, Soon-Jong ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 18~24
DOI : 10.11004/kosacs.2011.2.3.018
In this paper, we present the load-deflection behavior of GRP pipes. GRP buried pipes are widely used in construction in the advantage of their superior mechanical and physical characteristics such as high chemical resistance, high corrosion resistance, right weight, smooth surface of the pipe, and cost effectiveness from soil-structure interaction. To design flexible pipes to be buried underground, it should be based on the ASTM D2412(2010). When applying ASTM D 2412(2010) to the design, pipe stiffness(PS) must be predetermined by the parallel-plate test which requires tedious and laborious working process. To overcome such problems, the finite element simulations for finding the load-deflection behavior of the GRP flexible pipes is installed at UTM testing machine. In the finite element simulations, basic data, such as the modulus of elasticity of the material and cross-sectional dimension, is used. From the investigation, we found that the difference between experimental result and analytical prediction is less than 15% when the pipe deflected 3% and 5% of its vertical diameter although the pipe material is not uniform across the cross-section.
The Effect of Neglecting the Longitudinal Moment Terms in Analyzing Composite Laminate Plates
Han, Bong-Koo ; Baek, Jong-Nam ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 25~29
DOI : 10.11004/kosacs.2011.2.3.025
Some laminate orientations have decreasing values of
stiffnesses as the ply number increases. For such plates, the fiber orientations given above behave as specially orthotropic plates and simple formulas developed by the senior author. Most of the bridge and building slabs on girders have large aspect ratios. For such cases further simplification is possible by neglecting the effect of the longitudinal moment terms(Mx) on the relevant partial differential equations of equilibrium. In this paper, the result of the study on the subject problem is presented.
A Study on Optimum Section of New Type Steel-Concrete Composite Beam
Yoon, Myung-Ho ; Lee, Yoon-Hee ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 30~35
DOI : 10.11004/kosacs.2011.2.3.030
This study investigates the optimum section properties of newly developed steel-concrete composite beam. For that purpose we developed computer program calculating section properties. The suggested new beam section highly contribute to save inter-story height and reduce construction duration and cost compared with conventional steel works such as H-beam and column + RC slab system. But the section shape have different section modulus with upper and lower fiber because of the unsymmetric cross section. Therefore the parametric study on thickness-ratio of top and bottom flange plate is needed. In this paper the change of neutral axis and section modulus for thickness-ratio of up and down flage plate is analysed and discussed.
Experimental Method for Evaluating Debonding Strength of FRPs Used for Retrofitting Concrete Structures
Utui, Nadia ; Kim, Hee-Sun ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 36~41
DOI : 10.11004/kosacs.2011.2.3.036
This study proposes a experimental method to evaluate bonding strength of FRPs used for retrofitting concrete structures. Specimens are designed so that debonding failure of FRPs can be induced from reinforced concrete beams retrofitted with two layers of carbon and glass FRPs. And three-point loading tests are performed to see if debonding failure with proper debonding strength is observed from the specimens. The test results show that the tested beams are failed due to debonding of FRPs, therefore, the proposed test method is capable of evaluating debonding strength of FRPs using relatively small normal strength concrete beams.
Influence of Loading Sizes on Natural Frequency of Composite Laminates
Han, Bong-Koo ; Suck, Ju-Won ;
Journal of the Korean Society for Advanced Composite Structures, volume 2, issue 3, 2011, Pages 42~47
DOI : 10.11004/kosacs.2011.2.3.042
A method of calculating natural frequencies corresponding to the modes of vibration of beams and tower structures with irregular cross sections and arbitrary boundary conditions was developed. The result is compared with that of the beam theory. Finite difference method is used for this purpose. The influence of the
stiffness on the natural frequency is rigorously investigated. In this paper, the relation between the applied loading sizes and the natural frequency of vibration of some structural elements is presented. The results of application of this method to steel bridge and reinforced concrete slab bridge by using specially orthotropic plate theory is presented.