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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 26, Issue 6 - Dec 2014
Volume 26, Issue 5 - Oct 2014
Volume 26, Issue 4 - Aug 2014
Volume 26, Issue 3 - Jun 2014
Volume 26, Issue 2 - Apr 2014
Volume 26, Issue 1 - Feb 2014
Selecting the target year
An Experimental Study of Improving Fire Performance with Steel-fibers for Internally Anchored Square Composite Columns
Kim, Sun Hee ; Yom, Kong Soo ; Kim, Yong Hwan ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 499~509
DOI : 10.7781/kjoss.2014.26.6.499
This study focuses on mixing steel fiber in the concrete to improve the ductility and toughness of the columns. The purpose of the study is to evaluate the load capacity and deformation capacity associated with the amount of steel fiber and loading condition and to analyze the interplay between the steel fiber reinforced concrete and the welding built-up square tube in terms of structure and fire resistance performance. Reinforcement of concrete with steel fiber(Vf=0.375%), when cross-section shape and boundary condition (load ratio) remained unchanged, improved fire resistance performance by 1.1~1.3 times. It is deemed that the area resisting thermal load increased and fire resistance performance was improved since the concrete reinforced with steel fiber restrained cracking. In addition, the fact that the cross-sections of the concrete were barely damaged indicates that load share capacity was greatly improved.
Evaluation of Vibration and Structural Performance of an Innovative Sliding Step Steel Stair Using Full-Scale Mock-up Test
Kim, Sung Yong ; Lee, Cheol Ho ; Kim, Na Eun ; Cho, Sung Sang ; Chung, Woon Ok ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 511~522
DOI : 10.7781/kjoss.2014.26.6.511
In this study, an innovative steel stair system is presented which enables rapid erection and high quality control in both residential and office building construction. This system features two lightweight steel stringers of box shape, bolted connections easy to absorb construction tolerance, and stair steps movable transversely (or sliding steps) such that the work space needed for concrete stairway wall could be easily provided. In this type of stairway system, other than providing robust connecting details, ensuring vibration performance is especially important since this system may be vibration-sensitive due to lightweight nature and/or probable low damping. To tackle these issues, a series of full-scale mock-up tests were conducted by using box-shape stringer members with or without concrete-fill. The connection system was shown to be sufficiently stiff and strong, or it remained elastic even under the 160% of service load level. Among the seven stringer alternatives, five exhibited satisfactory vibration performance according to the related North American and European acceptance criteria.
Prediction of Column Axial Force in X-braced Seismic Steel Frames Considering Brace Buckling
Yoon, Won Soon ; Lee, Cheol Ho ; Kim, Jeong Jae ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 523~535
DOI : 10.7781/kjoss.2014.26.6.523
According to the capacity design concept underlying current steel seimsic provisions, the braces in concentrically braced frames should dissipate seismic energy through cyclic tension yielding and compression buckling. On the other hand, the beams and the columns in the braced bay should remain elastic for gravity load actions and additional column axial forces resulting from the brace buckling and yielding. However, due to the difficulty in accumulating the yielding and buckling-induced column forces from different stories, empirical and often conservative approaches have been used in design practice. Recently a totally different approach was proposed by Cho, Lee, and Kim (2011) for the prediction of column axial forces in inverted V-braced frames by explicitly considering brace buckling. The idea proposed in their study is extended to X-braced seismic frames which have structural member configurations and load transfer mechanism different from those of inverted V-braced frames. Especially, a more efficient rule is proposed in combining multi-mode effects on the column axial forces by using the modal-mass based weighting factor. The four methods proposed in this study are evaluated based on extensive inelastic dynamic analysis results.
Test Result on Embedded Steel Column-to-Foundation Connection for Modular Unit Structural System
Lee, Sang Sup ; Bae, Kyu Woong ; Park, Keum Sung ; Hong, Sung Yub ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 537~547
DOI : 10.7781/kjoss.2014.26.6.537
A steel modular unit structural system has been used increasingly for mid and high-rise buildings, since the building can be easily constructed by assembling the pre-made modular unit structures. For this structural system, each modular unit structures have to be properly connected to the foundation to transfer the axial force and the bending moment that are generated from external load to the ground. In this study, a new type of the embedded steel column-to-foundation connection was proposed, and its flexural behavior was evaluated through a series of experimental study. Five full scale specimens for the proposed connections were constructed and tested. The effect of the main parameters that affect the flexural behavior of the proposed connection, such as embedment length and shape of end plate, were studied. From the results, it was found that the flexural stiffness of the proposed connection was higher than that of the semi-rigid connection for all test specimens, and 200 mm of embedment length was proper for the given test specimens in this study.
Development of Buckling Restrained Brace Laterally Supported by Semicircular Springs
Park, Keum Sung ; Lee, Sang Sup ; Hong, Sung Yub ; Bae, Kyu Woong ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 549~558
DOI : 10.7781/kjoss.2014.26.6.549
Buckling restrained braces(BRBs) developed as a seismic protection element, hysteretic damper, have been investigated in America and Japan mainly. BRBs are composed of a steel core and concrete-filled steel casing. It is one of the major causes of drop in productivity to fill the steel casing with concrete. To improve this problem, the BRB is introduced in which the steel core is restrained with a pair of semicircular springs. In this paper, the numerical and analytical investigation about the desirable configuration for a semicircular spring is presented. Firstly, the stiffness and strength of semicircular spring is determined theoretically to buckle into a very high-order modes. Then, the required stiffness and strength are calculated under the practical design conditions and considered as reference values to find a proper configuration. The material strength and thickness of semicircular spring are chose from the finite element analysis for 5 semicircular springs with varying height. Finally, the nonlinear buckling analysis of BRB with proper semicircular springs shows that the bucking strength of the whole BRB is very similar to the strength of steel core with length between semicircular springs.
Compression and Shear Capacity of Rubber Bearings with Various Geometric Parameters
Park, Ji Yong ; Kim, Joo Woo ; Jung, Hie Young ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 559~570
DOI : 10.7781/kjoss.2014.26.6.559
In this study, compression and shear characteristics of laminated rubber bearings and lead rubber bearings with various parameters are investigated by using material and geometric nonlinear three-dimensional finite element analysis. Rubber coupon tests are performed to make a model of the laminated rubber bearings. In addition, the material constants of the rubber are calculated by the curve fitting process of stress-strain relationship. The finite element analysis and experimental tests of the laminate rubber bearings are used to verify the validity of the rubber material constants. It is seen that the compression behavior of the laminated rubber bearings and lead rubber bearings mainly varies depending on the first shape factors and their shear behavior significantly varies depending on the second shape factors. In addition, the horizontal stiffness and energy dissipation capacity of lead rubber bearing are increased when the diameter of a lead bar is increased.
A Study on the Development of Force Limiting Devices of Folded Plate Type
Kim, Cheol Hwan ; Chae, Won Tak ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 571~579
DOI : 10.7781/kjoss.2014.26.6.571
The steel braces are used to control the lateral drift of high rise buildings. The braces are designed as tensile members since the braces consisted of slender member can not resist compressive loads by elastic buckling. To resolve this problem, a lot of research were performed to develop the non-buckling member. The force limiting device (FLD.) is one of them. The purpose of this study is the development of FLD. to prevent a elastic buckling for a slender member. The folded plate type is proposed to induce the yielding before occurring elastic buckling. In this study, member test and FEM analysis for proposed type were performed. Further, It is verified that the structure with FLD member is stable by high energy absorption. The proposed folded plate type FLD could be effective to preserve the compressive member from the elastic buckling.
Evaluation of Flexural Strength of Hybrid Girder composed of HSB800 and HSB600 Steel
Park, Yong Myung ; Kang, Ji Hoon ; Lee, Kun Joon ; Kim, Hee Soon ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 581~594
DOI : 10.7781/kjoss.2014.26.6.581
In this paper, flexural resistance of hybrid girder under uniform bending moment was evaluated, which is composed of HSB800 and HSB600 steel for the flange and web, respectively. Doubly-symmetric and monosymmetric sections with noncompact or compact flange and slender, noncompact or compact web were considered. Nonlinear analyses with 3-dim. shell element model were performed to determine the 'flexural resistance of section' and the 'lateral torsional buckling strength' by taking initial imperfection and residual stress into account. The numerical results were compared with the AASHTO LRFD and Eurocode 3 specifications and also the applicability of AASHTO LRFD appendix A6 was examined for the sections with noncompact and compact web.
Experiments on Flexural Resistance of Longitudinally Stiffened Plate Girder with Slender Web
Park, Yong Myung ; Lee, Kun Joon ; Ju, Ho Jung ; Jo, Sung Hoon ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 595~604
DOI : 10.7781/kjoss.2014.26.6.595
In this paper, a series of experiments for the evaluation of flexural resistance of longitudinally stiffened plate girder with slender web were conducted. For the purpose, four plate girder specimens with and without longitudinal stiffener were fabricated for the web slenderness of 219 and 156. The test results were compared with the current AASHTO LRFD and Eurocode 3 codes, respectively. As presented in the previous paper by the authors, it was acknowledged that the AASHTO LRFD code could considerably underestimate the flexural resistance of longitudinally stiffened girder with slender web and the proposed method in the previous paper could estimate the flexural resistance reasonably.
A Study on the New Type Rib of Steel Deck Plates
Chu, Seok Beom ; Park, Jong Hae ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 605~615
DOI : 10.7781/kjoss.2014.26.6.605
The purpose of this study is to propose an economic new type rib by applying plate stiffening methods of the corrugated plate and the honey-comb sandwich panel to the steel deck plate and comparing the new type rib with existing open and closed ribs. The trapezoidal corrugated type, ㄹ type, honey-comb type and ㅁ type ribs are considered as new type ribs and the moment and the steel volume are compared with that of open ribs and closed ribs. The results shows that the honey-comb type and ㅁ type ribs are good in aspects of economic feasibility and the ㅁ type is better than the honey-comb type. To make the ㅁ type rib applicable to the steel deck plate, the sensitivity analysis and parametric study are performed and the system to select the proper section under the particular stress condition is established. The closed rib of real bridges is compared with the ㅁ type rib of the proposed system and it is known that the new type rib is more economic. Therefore, more economic steel deck plates can be achieved by using the system proposed in this study for the plate stiffened with the new ㅁ type rib.
Tensile Strength of Plate with Bolt Hole and Bearing Strength of Bolted Connection by Oxygen Torch Cut
Park, Yong Myung ; Lee, Kun Joon ; Kim, Dong Hyun ; Ju, Ho Jung ;
Journal of Korean Society of Steel Construction, volume 26, issue 6, 2014, Pages 617~626
DOI : 10.7781/kjoss.2014.26.6.617
In this paper, experiments for the evaluation of tensile strength of steel plate with bolt hole and bearing strength of bolted connection were performed, where bolt holes were punched by drilling and oxygen torch, respectively. For the tensile tests, drilled and oxygen torch punched steel plate specimens of 10mm and 15mm thickness were made from structural angles and H-shapes, respectively. For the bearing strength evaluation, test specimens were fabricated with base plates and splice plates those were also punched by drilling and oxygen torch, respectively. The Vicker's hardness were measured around the bolt hole to investigate material property change due to heat effect by oxygen torch cut. Numerical analysis was also performed to investigate the bearing strength of bolted joints due to the increase of hardness around the bolt hole by oxygen torch cut.