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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Steel Construction
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Journal DOI :
Korean Society of Steel Construction
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Volume & Issues
Volume 25, Issue 6 - Dec 2013
Volume 25, Issue 5 - Oct 2013
Volume 25, Issue 4 - Aug 2013
Volume 25, Issue 3 - Jun 2013
Volume 25, Issue 2 - Apr 2013
Volume 25, Issue 1 - Feb 2013
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Evaluation on Applicability of Built-up Square Tubular Compression Members Fabricated with HSA800 High Performance Steel Considering Local Buckling
Yoo, Jung Han ; Kim, Joo Woo ; Yang, Jae Guen ; Kang, Joo Won ; Lee, Dong Woo ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 223~231
DOI : 10.7781/kjoss.2013.25.3.223
Recently, high-performance steels have been increasingly used for structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. This paper offers a series of basic study for the design specification of structural members using high performance steel, that is material properties of HSA800 (High-performance rolled steel for building structures). Built-up square tube stub columns with variables of width-to-thickness ratios are planned as a parametric study in order to investigate the local buckling behaviors and check the current design limit of width-to-thickness ratio. In addition, the buckling behaviors of stub columns obtained finite element (FE) analysis were compared with those from experimental tests. The verified FE model was used for parametric study and checked applicability of high-strength steel on current design specification.
Performance Evaluation of Full-scale H-shape Beam-to-Column New-Shape Weak Axis Connection
Shim, Hyun Ju ; Cho, Han Sol ; Kim, Dae Hoi ; Kim, Sang Seup ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 233~242
DOI : 10.7781/kjoss.2013.25.3.233
This paper reports a new beam-to-column connection that is suitable for use in the weak axis of a column. The proposed system mainly uses bolts, and it minimizes the use of welding, which is generally difficult to perform onsite. In this system, a H-shape steel beam is joined to a H-shape steel column by bolted splices at the top flange and without a scallop at the web. The structural performance of the proposed connection was verified through full-scale tests of nine specimens, taking into account the effects of the geometry and arrangement of the plate.
Internal Confining Stress of Internally Confined Hollow Columns under Compressive Load
Won, Deok Hee ; Han, Taek Hee ; Kim, Seungjun ; Kang, Young Jong ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 243~254
DOI : 10.7781/kjoss.2013.25.3.243
Internally Confined Hollow RC(ICH RC) column consisted of concrete, transverse reinforcement, longitudinal reinforcement, and inner tube. It had good strength and ductility by core concrete was become triaxial confining state with transverse reinforcement and inner tube. There were two confining stress as external confining stress and internal confining stress in an ICH RC column. While external confining stress was researched by former researchers, internal confining stress has not researched. In this paper, confining stress of both Hollow RC column and ICH RC column was investigated using FEA program. Relation between theoretical confining stress and internal confining stress was drawn by analysis results. Modified failure condition equations of inner tube were suggested to base on failure condition equations of inner tube by former researcher. When thickness of inner tube was calculated by modified equations, it could be economic because thickness of inner tube was reduced 50% compared with former researcher equations in order to same confining stress.
An Experimental Evaluation of Structural Performance for the Beam to Column Joints in Unit Modular System
Lee, Sang Sup ; Bae, Kyu Woong ; Park, Keum Sung ; Hong, Sung Yub ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 255~265
DOI : 10.7781/kjoss.2013.25.3.255
The major goal of this study is to develop the industrialized structural system that can build high-rise buildings using the box-shaped steel frames such as a unit module system. In order to achieve such a goal, we need the advanced details for joints that consist in a single unit. Furthermore we also need to commercialize the unit modular building system through the basic experiments, research of theoretical analysis and the achievement of seismic performance. This study derived to develop the derails in the beam-to-column joint and to carry out structural performance test. Test results, a joint with thickness of 6.0T can be possible to maintain the plastic rotational angle for strength and seismic performance. Therefore, joint with thickness of 6.0T is able to apply when considering reinforcement in the local of stress concentration.
Formulating the Local Displacement and Local Moments of a Plate Stiffened with Open Ribs According to the Loading Sizes
Chu, Seok Beom ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 267~278
DOI : 10.7781/kjoss.2013.25.3.267
In this study, stiffened plates with open ribs are analyzed to estimate and formulate the local displacement and local moments according to square loading sizes. For the local behaviors of plates stiffened with rectangular and reverse T ribs, the ratio functions according to the dimensions of stiffened plates are obtained at each square loading size. Analytical results show that values of the basic stiffened plates are different but the ratio functions of each square loading size are similar and the difference of the ratio functions between rectangular ribs and reverse T ribs are small, so the ratio functions can be unified by integrating the loading sizes regardless of the rib type. The application of the unioned ratio functions to L type ribs and rectangular loading shows good accuracies. Therefore, the local behaviors of plates stiffened with open ribs can easily be obtained by using the unioned ratio functions proposed in this study.
A Study on the Development of Force Limiting Devices(FLD) which Induce Yielding before Elastic Buckling
Kim, Cheol Hwan ; Chae, Won Tak ; Oh, Young Suk ; Kim, Chae Yeong ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 279~287
DOI : 10.7781/kjoss.2013.25.3.279
The steel members are applied to high rise building since they have high strength compare to the concrete member. On the other hand, the elastic buckling is likely to occur in steel member because of their small section. When the elastic buckling occur, the steel structure lose a load carrying capacity. The steel frame would be unstable due to a rapid decline in strength by buckling. The purpose of this study is the development of FLD(Force Limiting Device) to prevent a elastic buckling for a slender member. Further, the behavior of steel structures with FLD would be stable by high energy absorption capacity. The proposed type of FLD is the type of out-of-plane resistance. In this study, member test and FEM analysis for proposed type were performed. The test parameters are thickness and gradient angle of out-of-plane plate. The proposed type may be effective method for FLD.
Local Buckling Behavior of Stub H-shaped Columns Fabricated with HSA800 High Performance Steels under Concentric Axial Loading
Lee, Kangmin ; Lee, Myung Jae ; Oh, Young Suk ; Kim, Tae Soo ; Kim, Do Hwan ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 289~297
DOI : 10.7781/kjoss.2013.25.3.289
In this study, the local buckling behavior of steel built-up columns, fabricated with grade 800MPa high performance (HSA800), was investigated to verify the suitability of width-to-thickness ratio limits adopted by the current design code. For this purpose, an experimental program was designed and performed for HSA800 steel column specimens with various width-to-thickness ratios. Then the experimental results were compared and verified with finite element analysis results. The parametric analytical studies with various width-to-thickness ratios were also performed to investigate the missing data from the limited experimental studies. From the experimental and analytical studies, It was found that the finite analysis models could reasonably estimate the test results within the 5.3% average differences. The local buckling behaviors of HSA800 steel columns were found to be largely depend on the values of initial imperfection introduced into finite element analyses.
Behaviors of Long Square Hollow Section Columns Retrofitted using Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets) Subjected to Concentrated Axial Loading
Park, Jai Woo ; Choi, Sun Kyu ; Yoo, Jung Han ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 299~305
DOI : 10.7781/kjoss.2013.25.3.299
This paper presents the experimental results of behacior of slender square hollow section columns strengthened with carbon fiber reinforced polymers (CFRP) sheets subjected to concentrated axial loading. Three long specimens were fabricated and one stub column were fabricated. The main parameters were the number of CFRP layers. From the tests, it was observed that global buckling were occurred at the center of specimen for unretrofitting slender column. However, CFRP retrofitting could prevent the global buckling of slender column. Maximum increase of 22% was also achieved in axial-load capacity with three longitudinal layered CFRP applied on four sides of steel tubes.
New Development of Hybrid Concrete Support Structure with Driven Piles for Offshore Wind Turbines
Kim, Hyun Gi ; Kim, Bum Jun ; Kim, Ki Du ;
Journal of Korean Society of Steel Construction, volume 25, issue 3, 2013, Pages 307~320
DOI : 10.7781/kjoss.2013.25.3.307
This paper proposes a new hybrid support structure by the driven piles which removes disadvantages of the existing type of support structure for offshore wind turbines. The hybrid type of support structure is combined with concrete cone and steel shaft, and is supported not only by gravity type foundations but also by driven piles. For three dimensional analysis of the huge and thick concrete structure, a solid-shell element that is capable of exact modeling and node interpolations of stresses is developed. By applying wave theory of stream function and solid-shell element in XSEA simulation software for fixed offshore wind turbines, a quasi-static analysis and natural frequency analysis of proposed support structure are performed with the environmental condition on Southwest Coast in Korea. In the result, lateral displacement is not exceed allowable displacement and a superiority of dynamic behavior of new hybrid support structure is validated by natural frequency analysis. Consequently, the hybrid support structure presented in this study has a structural stability enough to be applied on real-site condition in Korea. The optimized structures based on the preliminary design concept resulted in an efficient structure, which reasonably reduces fabrication costs.