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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 24, Issue 6 - Dec 2012
Volume 24, Issue 5 - Oct 2012
Volume 24, Issue 4 - Aug 2012
Volume 24, Issue 3 - Jun 2012
Volume 24, Issue 2 - Apr 2012
Volume 24, Issue 1 - Feb 2012
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An Experimental Study on Flexural/Shear Load Properties of SC(Steel Plate Concrete) Structure with Reinforced Concrete Joint
Lee, Kyung-Jin ; Hwang, Kyeong-Min ; Hahm, Kyung-Won ; Kim, Woo-Bum ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 137~147
DOI : 10.7781/kjoss.2012.24.2.137
This paper describes an experimental study on the mechanical characteristic and behavior of a structure that has a joint between the reinforced concrete (RC) member and steel plate concrete (SC) member. An out-of-plane flexural test on an L-type test specimen and in-plane shear test on an I-type test specimen were carried out by means of repeated cyclic loading until their failure. Based on the results, the former showed pull-out failure mode of anchored vertical bars while the latter exhibited flexural failure mode of the basement member. These results reveal that the maximum capacity of the specimens is 96% and 82%, respectively, compared with the theoretical value.
Experimental study on a Cantilever Type Metallic Damper for Seismic Retrofit of Building Structures
Ahn, Tae-Sang ; Kim, Young-Ju ; Park, Jin-Hwa ; Kim, Hyung-Geun ; Jang, Dong-Woon ; Oh, Sang-Hoon ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 149~161
DOI : 10.7781/kjoss.2012.24.2.149
The use of seismic energy-dissipative devices for passive control is increasing exponentially in the recent years for both new and existing buildings. Use of these devices started in and has been somewhat limited to developed countries. One of the current challenges is to promote the use of seismic dampers in earthquake-prone developing countries by lowering the cost of the devices. This paper proposed a new type of seismic damper based on yielding of a cantilever type metallic element for seismic retrofit of existing and new building structures. The hysteretic behavior and energy dissipation capacity of the proposed damper was investigated using component tests under cyclic loads. The experimental results indicated that the damping device had stable restoring force characteristics and a high energy dissipation capacity. Based on these results, a simple hysteretic model for predicting the load-displacement curve of the seismic damper was proposed.
Test and Analysis on the Transverse Gusset Plate Connection to Circular Hollow Section(CHS) of High Strength
Lee, Swoo-Heon ; Shin, Kyung-Jae ; Lee, Hee-Du ; Kim, Woo-Bum ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 163~173
DOI : 10.7781/kjoss.2012.24.2.163
A connection composed of a circular hollow structural section (HSS) has complicated details, and exhibits a very complex local deformation when it reaches the yield stress. Given these circumstances, proposing a simple design equation considering local deformation is difficult. The design equations of the Korea Building Code (KBC 2009) for HSS joints are simple and are very similar to those of the AISC. These design equations limit the maximum yield stress up to 360MPa and yield ratio (yield strength/tensile strength) up to 0.8. This means that the material with yield strength exceeding 360MPa could be used after verification based on the test or rational analysis for the similar connection. This paper introduces an experimental program and finite element analysis (FEA) for the circular hollow section (CHS) with a transverse gusset plate made of high-strength steel (HSB600) or structural steel (SS400) when the joints are subjected to lateral force. Comparison of the design equations with the results of FEA and test may be used for the modification of the design equations.
Parametric Study on Curved Tub Girders for Varying Radii of Curvature
Kim, Jong-Min ; Han, Taek-Hee ; Choi, Jun-Ho ; Choi, Byung-Ho ; Kang, Young-Jong ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 175~188
DOI : 10.7781/kjoss.2012.24.2.175
A parametric study for varying the radii of curvature is performed with a curved tub girder bridge having three continuous spans. The bracing forces of top lateral bracings from the results of numerical equations are compared to those of 3-dimensional finite element analyses. New modifying factors applicable in computing the nominal member forces of top lateral bracings were suggested. The numerical equations were derived based on one girder system, and it is shown that the numerical equations exhibit some errors compared with 3D FEA results. The main reason for this phenomenon lies on the number of girders. The twin girder system has an external cross-beam between inner and outer girder. It also has larger lateral stiffness than the single girder system. Finally, the distributions by the torsion, bending, distortion, and lateral loading of the top lateral bracing forces were presented in this paper.
The Compressive Strength of Thin-Walled Cold-Formed Steel Studs with Slits in the Web
Kwon, Young-Bong ; Soe, Eung-Kyu ; Lim, Duk-Man ; Kim, Gap-Deuk ; Kwon, In-Kyu ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 189~197
DOI : 10.7781/kjoss.2012.24.2.189
The cold-formed steel stud, which has been used as a load-bearing member of wall panels for steel houses, poses a significant problem in insulation due to heat bridging of the web. Therefore, some additional thermal insulating materials are required. In order to solve this problem, the cold-formed steel thermal stud with slits in the web was developed. However, estimating the structural strength of thermal studs is very difficult because of the arrangement of perforations. In this paper, an analytical and experimental research on thermal studs is described. Three types of studs with different length, pitch and arrangement of slits were tested to failure. A simple design approach was proposed based on the test results. The proposed method adopted the direct strength method, based on the elastic local and distortional buckling stress of plain studs with equivalent thickness in the web instead of thermal studs. The predictions using the proposed method were compared with test results for verification and the adequacy of the proposed method was confirmed.
The Weld Strength and Design Tables for the Unstiffened Seated Connections
Choi, Sun-Kyu ; Yoo, Jung-Han ; Lee, Kang-Min ; Park, Jai-Woo ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 199~206
DOI : 10.7781/kjoss.2012.24.2.199
Unstiffened seated connections (USC) ensure easy installation and safety during erection, thereby making the process more economical. USCs consist of a seat angle for carrying the beam's reactions and a top angle to provide beam stability. These angles are bolted or welded to the beam and supporting member. This paper sought to propose a design table for the weld strength of such connections obtained from the elastic vector method (EVM) and the instantaneous center-of-rotation method (ICM) in terms of calculating the eccentricity. Also, the proposed design table is compared with both AISC and KBC specifications.
A Study on the Concrete Breakout Capacity of CIP Anchor Bolts under Shear Loading
Park, Yong-Myung ; Jeon, Myeong-Hui ; Choi, Myung-Kuk ; Kim, Cheol-Hwan ; Kim, In-Gi ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 207~215
DOI : 10.7781/kjoss.2012.24.2.207
The 45-degree cone failure theory has been used in concrete anchor bolts design under shear loading, but the CCD (Concrete Capacity Design) method was adopted as a new design method since 2000. However, the method was allowed only for anchor diameters of less than 50mm because it is based on the experimental results of small size anchor bolts. Therefore, it is necessary to develop a rational concrete breakout capacity equation for medium-to-large size anchor bolts with large edge distance. In this study, shear tests on M56 cast-in-place single anchor bolt with edge distance of 350mm were performed using four test specimens. Based on the test results and findings of existing studies, a new equation for the breakout capacity of anchor bolts under shear loading with edge distance of up to 750mm was proposed.
Flexural Strength of HSB Steel Girders Due to Inelastic Lateral-Torsional Buckling - Sections with Slender Web
Cho, Eun-Young ; Shin, Dong-Ku ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 217~231
DOI : 10.7781/kjoss.2012.24.2.217
The flexural behavior of HSB I-girder with a non-slender web attributed to inelastic lateral-torsional buckling under uniform bending was investigated using nonlinear finite element analysis of ABAQUS. The girder was assumed to have a compact or noncompact web in order to prevent premature bend-buckling of the web. The unbraced length of the girder was selected so that inelastic lateral-torsional buckling governs the ultimate flexural strength. The compression flange was also assumed to be either compact or noncompact to prevent local buckling of the elastic flange. Both homogeneous sections fabricated from HSB600 or HSB800 steel and hybrid sections with HSB800 flanges and SM570-TMC web were considered. In the FE analysis, the flanges and web of I-girder were modeled as thin shell elements. Initial imperfections and residual stresses were imposed on the FE model. An elasto-plastic strain hardening material was assumed for steel. After establishing the validity of the present FE analysis by comparing FE results with test results in existing literature, the effects of initial imperfection and residual stress on the inelastic lateral-torsional buckling behavior were analyzed. Finite element analysis results for 96 sections demonstrated that the current inelastic strength equations for the compression flange in AASHTO LTFD can be applied to predict the inelastic lateral torsional buckling strength of homogeneous and hybrid HSB I-girders with a non-slender web.
A Study on Flexural Behavior of Composite PHC pile with CT Structural Steel
Mha, Ho-Seong ; Won, Jeong-Hun ; Cho, Hyo-Sang ;
Journal of Korean Society of Steel Construction, volume 24, issue 2, 2012, Pages 233~243
DOI : 10.7781/kjoss.2012.24.2.233
This study verifies the structural capacity of the composite PHC pile (Pretensioned spun high-strength concrete) consisting of a PHC pile and two CT structural steels. Four full-scale specimens are fabricated and the experimental tests were performed to investigate the flexural behaviors of the composite PHC piles. The composite PHC pile can enhance both the structural capacity and functional convenience, since the web of CT structural steel with holes in the web acts as a shear connector (referred to as the perfobond rib), which can connect concrete and steel. All specimens exhibited flexural failure and the ultimate strengths were larger than the anticipated design strength according to the design standard. Thus, the composite PHC pile can be applicable to wall structures with sufficient strength. In addition, it seems that the web of the CT structural steel with holes performs its role as shear connectors.