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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 21, Issue 6 - Dec 2009
Volume 21, Issue 5 - Oct 2009
Volume 21, Issue 4 - Aug 2009
Volume 21, Issue 3 - Jun 2009
Volume 21, Issue 2 - Apr 2009
Volume 21, Issue 1 - Feb 2009
Selecting the target year
An Experimental Study on Mechanical Properties of SC Beam Structure under Temperature Load
Lee, Kyung Jin ; Ham, Kyung Won ; Park, Dong Soo ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 443~450
This paper describes the experimental study that was conducted on the temperature characteristic and bending capacity of a steel-plate-reinforced concrete-wall module (SC module). The steel plate ratio and temperature loading parameters were tested, and the influence of these parameters on the moment-curvature relationship and on the bending strength of the SC module was investigated. The fundamental-structure characteristic result of every SC module that assumed practical use was investigated. In this study, the bending and flexural characteristics of SC structures were evaluated to verify the yielding and ultimate strength of the SC beam under thermal-loading conditions.
Evaluation on the In-plane Bending Moment for T-joints with Square Hollow Structural Sections
Park, Keum Sung ; Lee, Sang Sup ; Choi, Young Hwan ; Bae, Kyu Woong ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 451~459
The purpose of this study was to evaluate the in-plane bending moment for T-joints made of cold-formed square hollow steel sections. In the previous studies, the T-joint was shown not to have an obvious peak load, and the failure mode was the main chord flange failure at the branch-width-to-chord-width ratio (
) of below 0.71. Based on the experimental results, including the tests conducted by Zhao, the deformation limit of 1% B was proposed for
. Then, the ultimate in-plane bending strength was shown to be Mu=1.5
M1% B. The existing strength formulae for the original T-joint were investigated and were determined to be the main chord flange failure for the branch-squared T-joint. The bending strength formulae of CIDECT and other researchers were compared with the test results. Finally, a reasonably good agreement with Zhao's formula was found. Therefore, the design guidelines were presented based on Zhao's strength formula for T-joints.
Analytical Study on the Fire Resistance of Internally Confined Hollow CFT Column
Won, Deok Hee ; Han, Taek Hee ; Park, Jong Sup ; Kim, Young Jong ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 461~470
A column resisting axial load and seismic load is one of the main members in a structural system. The heated column by event of a fire can lose its strength and it may damage its structural system or cause the collapse of the entire structural system. In this study, the fire resistance capacity of internally confined hollow concrete filled tube (ICH CFT) column was investigated. In an ICH CFT column, the yield strength of the external tube is important as a concrete filled tube (CFT) column because the external tube confines the filled concrete and the strength of the column depends on the confined effect. A study was performed by finite element analyses considering the confined effect and material nonlinearity as the temperature changes by the fire. The hollow ratio, the thickness of the external tube, and the strength of concrete were selected as the parameters for the analyses. The analyses were performed by using a commercial FEA program (ABAQUS) and nonlinear concrete model program. The analysis results showed that the hollow ratio and the strength of concrete mainly affect the fire resisting capacity of an ICH CFT column.
Compression Behavior of Steel Plate-Concrete Structures for both Stiffened and Nonstiffened structures by Rib
Choi, Byong Jeong ; Han, Hong Soo ; Han, Kweon Gyu ; Lee, Seung Joon ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 471~481
The purpose of this study was to compare and analyze the compression behaviors of SSC (stiffened steel plate-concrete) and NSC (non-stiffened steel plate-concrete) structures, and to identify the effects of the increment in the structural performance of SSC structures. SCC structures are structures that integrate steel plates with line support from ribs (H-shape) and point supports from studs with concretes. On the other hand, NSC structures are structures that integrate steel plates with point supports from studs with concrete. The following results were obtained in this study. First, compared with NSC structures, it was shown that SSC structures have advantages in terms of preventing steel plate buckling and delaying quick destruction through the brittleness of concrete. In addition, the SSC structures showed a 5-28% increment in maximum compressive strength, which far surpassed that shown by the NSC structures.
Analytical Study on Behaviour of Plane Steel Frame with Semi-Rigid Beam-to-Column Connection
Kim, Jong Sung ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 483~492
In this study, nonlinear analysis of steel plane frame was performed using the refined plastic hinge method of advanced analysis techniques. In deterioration of stiffness in plastic zone, influences by flexural bending, residual stress, geometrical non-linearity, and semi-rigid connection are considered. And also, further reduced tangent modulus was used for geometrical non-linearity, top and seat angle were chosen for semi-rigid connection. Furthermore, 3 parameter power model was used for moment-rotation behaviour of beam to column connection. The loading conditions are combined with axial and lateral force and the inverse triangle distribution of lateral and eight type of analytical models were used in analysis. The results of analyses were compared with semi-rigid and rigid connection on behaviour of numerical analysis models. And also, the behaviors of frame with changes of semi-rigidity were analyzed by using the results obtained from MIIDAS-GENw.
Reliability-based Redundancy Evaluation Method for Steel Plate Girder Bridges
Joe, Woom Do Ji ; Park, Yong Myung ; Jin, Seung Hoon ; Hwang, Min Oh ; Chung, Heung Jin ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 493~503
Bridge redundancy is defined as the capability of a bridge to sustain loads after one of its main members incurs damage. It is affected by many parameters, including the number of girders, span length, girder height, internal supports, and secondary members. The present AASHTO and Korean Bridge design codes, however, define bridge redundancy only as the number of girders, and neither the evaluation method nor the required level of redundancy is given. This study presented a redundancy evaluation method for plate girder bridges with severe fatigue damage based on the reliability method,by considering the essential parameters. A required level of redundancy was also proposed as a target system reliability index from the load capacity analysis and reliability analysis of the basis bridge designed by LRFD. Finally, the level of redundancy of simple and continuous plate girder bridges with a variable number of girders designed by ASD was evaluated and presented.
A Study on the Structural Behavior and the Strength of Circular Hollow Steel(CHS) Section Columns
Kang, Doo Won ; Kwon, Young Bong ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 505~514
This paper describes the structural behavior and the ultimate strengths of circular hollow steel (CHS) sections based on a series of compression tests. The ultimate strengths of CHS section columns are mainly dependent on both diameter-thickness ratio and column slenderness ratio. For the CHS sections with a high diameter-thickness ratio, an elastic or an inelastic local buckling may occur prior to the overall buckling, and it may decrease the column strength. Test sections were fabricated from SM400 steel plate of 2.8 mm and 3.2 mm in thickness and were tested to failure. The diameter-thickness ratios of the test sections ranged from 45 to 170 to investigate the effect of local buckling on the column strength. The compression tests indicated that the CHS sections of lower diameter-thickness ratio than the yield limit in the current design specifications showed an inelastic local buckling and a significant post-buckling strength in the local mode. Their ultimate stresses were larger than the nominal yield stress. It was known that the allowable stresses of the sections predicted by the Korean Highway Bridge Design Specifications (2005) were too conservative in comparison with test results. The Direct Strength Method which was newly developed was calibrated for application to the CHS sections by the experimental and numerical results. The Direct Strength Method proposed can predict properly the ultimate strength of CHS section columns whether a local buckling and an overall buckling occur nearly simultaneously or not.
Water pressure Test and analysis for Welding Thickness Decision of New Cold-formed Type Concrete Filled Tubular Square Column
Lee, Seong-Hui ; Kim, Sun Hee ; Kim, Young Ho ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 515~526
There are three main production processes in the manufacture of concrete-filled square steel columns. The first process is known as the 'box-type process' or 'four-seam method,' wherein four beams are welded together at the seams. The second is the 'cold-forming process' or 'two-seam method,' wherein the seams of two channel beams are welded together. The third is the 'pressing process' or 'one-seam method,' wherein a circular column is pressed until it becomes a square column. In calculating the production cost for the making of a steel tube, it is very important to consider the welding process to be used and the desiredthickness of the steel tube, such as a square column that was developed under a new method, formed through the four-seam flare welding method at the center of the steel column width, following the L-shape formation. Certain tests were suggested in this study to evaluate the welding amount of concrete-filled square steel columns. With the parameters of the production method of a square steel column, the thickness of the steel square columns, and the welding amount, six specimens were produced. A structural test and finite-element analysis were conducted to assess the behavior of the steel column according to the water pressure inside the steel columns.
An Experimental Study on Ultimate Behavior of Thin-walled Carbon Steel Bolted Connections with Varying Plate Thickness and End Distance
Lee, Yong Taeg ; Kim, Tae Soo ; Jeong, Ha Young ; Kim, Seung Hun ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 527~536
The purpose of this experimental study was to investigate the block shear fracture behavior and curling effect on a single shear-bolted connection in thin-walled carbon steel fabricated with four bolts. The specimens that fail by block shear were planned to have a constant dimension of the edge distance perpendicular to the loading direction, bolt diameter, pitch, and gage. The main variables of the specimens were plate thickness and end distance parallel to the loading direction. A monotonic tensile test was carried out for the bolted connections, and the ultimate behaviors, such as the fracture shape, ultimate strength, and curling, were compared with those that had been predicted using the current design specifications. The conditions of curling occurrence in terms of plate thickness and end distance were also investigated, and the strength reduction due to curling was considered.
Design Equation for Square CFT Columns with Large Width-to-Thickness Ratio
Kim, Sun Hee ; Choi, Young Whan ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 537~544
The design standards, such as AISC-LRFD (2005) and KBC-2005, specify the maximum width-to-thickness ratio that can be used for computing the strength of the concrete-filled tube (CFT), and do not include any formula for computing the strength when the width-to-thickness ratio is over the limit. This paper proposes a strength equation for CFTs with a large width-to-thickness ratio by acknowledging the fact that the stiffened slender steel platehas substantial postbuckling strength, and that it therefore can be more economical to use it. The equation adopts the concept of effective width,which is very useful for plate analysis. By comparing the strengths of AISC2005, KBC2005, and the proposed method with the results of the experiment, where the width-to-thickness ratio was regarded as the main parameter, the applicability of the proposed method was verified.
Experimental Study on the Compressive Strength of yLRC Composite Columns
Kim, Hyung Geun ; Kim, Myeong Han ; Cho, Nam Gyu ; Kim, Sang Seup ; Kim, Sang Dae ;
Journal of Korean Society of Steel Construction, volume 21, issue 5, 2009, Pages 545~552
An experimental study was performed on the yLRC composite column. Its external surface was manufactured with y-shape steel sheets and L-shape steel angles, and concrete was poured inside in the field. This composite column has improved the section capacity due to the composite action of steel and concrete, and provides good efficiency in reducing the terms of construction works because of its abridged formworks. The stub column specimens (three small and three large specimens) were tested through concentrical axial loading, and the effect of the width-to-thickness ratio of the steel angle on the column axial strength was examined. The axial strength and behavior of the composite columns were analyzed, and a formula for predicting the axial load capacity was proposed.