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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 3, Issue 4 - Dec 2012
Volume 3, Issue 3 - Sep 2012
Volume 3, Issue 2 - Jun 2012
Volume 3, Issue 1 - Mar 2012
Selecting the target year
Geometrically Nonlinear Analysis of Hinged Cylindrical Laminated Composite Shells
Han, Sung-Cheon ;
Journal of the Korean Society for Advanced Composite Structures, volume 3, issue 2, 2012, Pages 1~10
DOI : 10.11004/kosacs.2012.3.2.001
In the present study, an Element-Based Lagrangian Formulation for the nonlinear analysis of shell structures is presented. The strains, stresses and constitutive equations based on the natural co-ordinate have been used throughout the Element-Based Lagrangian Formulation of the present shell element which offers an advantage of easy implementation compared with the traditional Lagrangian Formulation. The Element-Based Lagrangian Formulation of a 9-node resultant-stress shell element is presented for the anisotropic composite material. The element is free of both membrane and shear locking behavior by using the assumed natural strain method such that the element performs very well in thin shell problems. The arc-length control method is used to trace complex equilibrium paths in thin shell applications. Numerical examples for laminated composite curved shells presented herein clearly show the validity of the present approach and the accuracy of the developed shell element.
Flexural Failure Design Criteria for Retrofitted RC Slabs using FRP-UHPC Hybrid System
Kim, Jung Joong ; Noh, Hyuk-Chun ; Reda Taha, Mahmoud M. ;
Journal of the Korean Society for Advanced Composite Structures, volume 3, issue 2, 2012, Pages 11~18
DOI : 10.11004/kosacs.2012.3.2.011
This study proposes flexural failure design criteria of continuous slabs enhanced by a hybrid system of fiber reinforced polymer (FRP) and ultra high performance concrete (UHPC). The proposed hybrid retrofit system is designed to be placed at the top surface of the slabs for flexural strengthening of the sections in both positive and negative moment zones. The enhancing mechanisms of the proposed system for both positive and negative moment regions are presented. The neutral axis of the enhanced sections in positive moment zone at flexural failure is enforced to be in UHPC overlay for preventing the compression in FRP. From this condition, a relationship between design parameters of FRP and UHPC is established. Although the capacity of the proposed retrofit system to enhance flexural strength and ductility is confirmed through experiments of one-way RC slabs having two continuous spans, the retrofitted slabs failed in shear. To prevent this shear failure, a design criteria of flexural failure is proposed.
Evaluation on Structural Performance of Structural Insulated Panels in Wall Application
Nah, Hwan-Seon ; Lee, Hyeon-Ju ; Lee, Cheol-Hee ; Hwang, Sung-Wook ; Jo, Hye-Jin ; Choi, Sung-Mo ;
Journal of the Korean Society for Advanced Composite Structures, volume 3, issue 2, 2012, Pages 19~27
DOI : 10.11004/kosacs.2012.3.2.019
Structural insulated panels, which are structurally performed panels consisting of a plastic insulation bonded between two structural panel facings are one of emerging products with a viewpoint of its energy and construction efficiencies. These components are applicable to fabricated wood structures. By now, there are few technical documents regulated structural performance and engineering criteria in domestic market. This study was conducted to suggest fundamental reports such as racking resistance, axial capacity, transverse load capacity, and lintel load capacity for SIPs. Test results showed that maximum load was 44.3kN, allowable load was 14.7kN for racking resistance, and that maximum load was 137.6kN, allowable load was 37.4kN/m for axial compression capacity. For transverse load capacity, test results showed
of maximum load,
of allowable load. For lintel load capacity for SIPs dependent to lengths, allowable loads were 20.4kN for 600mm long lintel, 23.9kN for 1,200mm long lintel, 19.3kN for 1,800mm long lintel, and 2,400mm long lintel had 14.1kN of allowable load. In the near future, when the allowable load for wall application is established, SIPs is considered to substitute the existent post-and-lintel construction to bearing wall structure.
A Parametric Study on Seismic Performance of Internally Confined Hollow RC Columns
Won, Deok-Hee ; Han, Taek-Hee ; Kim, Jung-Hun ; Choi, Jun-Ho ; Kang, Young-Jong ;
Journal of the Korean Society for Advanced Composite Structures, volume 3, issue 2, 2012, Pages 28~35
DOI : 10.11004/kosacs.2012.3.2.028
Recently, there is to increase interest in seismic performance of piers. Hollow section is applied to increasing the seismic performance of piers. However, hollow RC pier becomes the biaixial confining state because hollow part is not confined. The pier is developed brittle failure from inner face in hollow part. A tube is inserted in hollow part to become the weakness. This is ICH RC(Internally Confined Hollow RC) pier. This pier is enhanced stiffness, strength, and ductility by core concrete has triaxial confining stress. In this paper is researched about parameters effect the seismic performance. Parameters are hollow ratio, transverse reinforcement, longitudinal reinforcement, and concrete strength.
Fire Resistance Performance and Thermal Performance Evaluation of Structural Insulated Panels for Low-Energy Houses
Lee, Hyeon-Ju ; Nah, Hwan-Seon ; Lee, Cheol-Hee ; Choi, Sung-Mo ;
Journal of the Korean Society for Advanced Composite Structures, volume 3, issue 2, 2012, Pages 36~46
DOI : 10.11004/kosacs.2012.3.2.036
Structure Insulated Panel (SIP) is an wooden structure material with which structure and insulation functions are satisfied. Hence, it would be a cost-effective model to implement low energy house which has higher insulation and structure performance and which the wall thickness is able to be reduced. In this study, performance of thermal insulation and fire resistance were evaluated in order to verify applicability to low energy house. Fire resistance test is performed on vertical load bearing members for partitions, and the test results satisfy one hour of fire resistance condition according to KS F 2257. The members include two layers of fireproof gypsum board with thicknesses of 12.5mm attached to SIP. Thermal insulation performance is satisfied with the 2012 standard (
). As the performance of resistance and thermal insulation are satisfied, SIP is expected to be applied to low energy building materials. In the future, the structural safety will be confirmed by structural performance and seismic performance test and the guidelines for distribution will be drawn up.
A Study on Edge Reinforcement Effect of Cylindrical Shells with Composite Laminate
Son, Byung-Jik ; Ji, Hyo-Seon ; Chang, Suk-Yoon ;
Journal of the Korean Society for Advanced Composite Structures, volume 3, issue 2, 2012, Pages 47~54
DOI : 10.11004/kosacs.2012.3.2.047
In this study, composite laminate cantilever type cylindrical shells with edge-stiffeners are analyzed. A versatile 4-node flat shell element which is useful for the analysis of shell structures is used. An improved flat shell element is established by the combined use of the addition of non-conforming displacement modes and the substitute shear strain fields. Two models by load conditions are considered. Load type A and B are loaded by point load at the free edge and line load respectively. A various parameter examples are presented to obtain proper stiffened length and stiffened thickness of edge-stiffeners. It is shown that the thickness of shell can be reduced minimum 30% by appropriate edge-stiffeners.