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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 27, Issue 6 - Dec 2015
Volume 27, Issue 5 - Oct 2015
Volume 27, Issue 4 - Aug 2015
Volume 27, Issue 3 - Jun 2015
Volume 27, Issue 2 - Apr 2015
Volume 27, Issue 1 - Feb 2015
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Force-Deformation Relationship of Bearing-Type Bolted Connections Governed by Bolt Shear Rupture
Kim, Dae Kyung ; Lee, Cheol Ho ; Jin, Seung Pyo ; Yoon, Seong Hwahn ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 1~12
DOI : 10.7781/kjoss.2015.27.1.001
Well-designed bolted connections can exhibit excellent ductile behavior through bearing mechanism until the occurrence of bolt shear rupture. The ultimate strength analysis of eccentric bolted connections is an economical and mechanistic approach which uses such ductility. However, the bolt load-deformation relationship, which forms basis of the current practice, is based on very limited combinations of bolt and steel materials. The primary objective of this study was to establish the general bolt force-deformation relationship based on systematic single-bolt bearing connection tests. The test results showed that the projected area of the bolt hole and the strength and thickness of the plate to be connected are the main factors affecting the force-deformation relationship. The results of this study can be used for the instantaneous center of rotation method (ICRM) to achieve more accurate analysis and economical design of a variety of group-bolted connections subjected to eccentric shear.
An Experimental Study on Structural Performance of SFRC filled Built-up Square Columns
Kim, Sun Hee ; Yom, Kong Soo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 13~22
DOI : 10.7781/kjoss.2015.27.1.013
This study suggests mixing steel fibers in concrete to secure the toughness of the columns. Therefore, to evaluate the structural behavior of welded built-up square columns filled with steel fiber reinforced concrete, ten stub column specimens were fabricated for compressive loading test with variables of steel fiber mixing ratio and loading condition. It is deduced that the steel fibers continue to provide tensile strength even after the concrete cracks and thus improve the strength and behavior of the column when bending moment is applied to it. A small amount of steel fibers can improve compressive strength and bending strength and thus produce economically efficient results when employed in structural design.
Initial Imperfection and Axial Strength of Struts with Octagonal Hollow Section fabricated from HR Plate
Jo, Jae Byung ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 23~30
DOI : 10.7781/kjoss.2015.27.1.023
Developed in this study were Octagonal-hollow-section(OHS) struts, whose compressive strengths against flexural and local buckling is higher than H-shape or rectangular-hollow-section(RHS) struts with the same unit weight. OHS members are also advantageous in handling and storing compared to circular hollow sections(CHS). OHS members were fabricated from HR Plates by cold forming and fillet welding. 5 numbers of 20m long OHS struts were assembled, each of which consist of two 9.6m long OHS member and two end connection elements made of cast iron. The compressive strength of the OHS strut was evaluated by comparing the test results, design codes and FEM analysis each other. Test results show that all of the struts have almost same or larger compressive strength than Korean Road Bridge Design Code(KRBDC) (2012). The initial imperfections can be estimated by using measured strains and are turned out to be less than L/450 for all the struts tested. The results of FEM analysis show that the variation of initial imperfection has less effects on the compressive strength for struts with vertical surcharge than for those with self-weight only, while the strength decreases as the initial imperfection increases. As the result of this study, the allowable initial imperfection for 20m long OHS struts is recommended to be less than L/350 on job sites.
Constitutive Relation of Concrete to Predict P-M Interaction Strength of Rectangular CFT Short Columns
Lee, Cheol Ho ; Kang, Ki Yong ; Kim, Sung Yong ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 31~42
DOI : 10.7781/kjoss.2015.27.1.031
The plastic stress distribution method and the strain compatibility method are the two representative methods to calculate the P-M interaction strength of RCFT (rectangular concrete filled tube) columns. The plastic stress distribution method is approximate while the stress compatibility method should approach the exact solution if accurate constitutive relations of the materials involved are used. Recent study by the authors pointed out that, because of lack of accurate constitutive model for the concrete confined by the rectangular steel tube, no strain compatibility method according to the current structural provisions provides a satisfactory prediction of the P-M interaction strength of RCFT columns under various material combinations. An empirical constitutive model which can capture the stress-strain characteristics of the confined concrete of RCFT columns is proposed based on analyzing extensive exisitng test database. The key idea was to define the concrete crushing strain as a function of steel-to-concrete strength ratio and width-to-thickness ratio of steel tube. It was shown that the proposed model leads to more accurate and more consistent prediction of the P-M interaction strength of RCFT columns under general design conditions.
Structural Behavior Analysis of Concrete Encased and Filled tube Square Column with Construction Sequence
Kim, Sun Hee ; Yom, Kong Soo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 43~52
DOI : 10.7781/kjoss.2015.27.1.043
Constructions of buildings downtown are increasing as much as ever with a strong demand. Top-Down Method is suitable for its advantage in minimizing its disturbance to the neighborhood. Pre-founded when applied to CFT Column on-site welded is required for splicing. To complement the welded built-up square composite Column was developed. Top-down process will be pouring concrete in accordance with a step-by-step process. Thus, Pre-founded Column and cover concrete to determine the stress condition. Therefore, Concrete filled steel square tubular columns encased with precast concrete were studied. Five Centrally loaded Columns were tested to investigate the axial load carrying capacity. we analyzed the strength and behavior of CET Column by Loading conditions and concrete strength, thickness of cover concrete through structure experiments.
An Experimental Study on the Static Load Capacity of T-Type Tension Joints with High Tension Bolt
Lee, Seung Yong ; Choi, Jun Hyeok ; Kim, Kyong Tae ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 53~61
DOI : 10.7781/kjoss.2015.27.1.053
The tension type joint is a mechanically very efficient connection method, as it directly uses the load capacity of base metal or high tension bolt, the reduction of the number of drilling hole and fastening and the fatigue resistance. It is applied to the joint of girder and cross beam, horizontal joints of towers, beam to column joints, the secondary member joints of deck floor ends, and brackets. In this paper, static load tests for the T-type tension joint were conducted to investigate the structural behavior of the joint. The parameters were bolt diameter, flange thickness, and the reduction of clamping force of the joint. The failure modes and load capacity of joints and the effects of flange thickness, bolt diameter and clamping force were investigated.
Flexural Capacity of the Composite Beam using Angle as a Shear Connector
Kim, Young Ju ; Bae, Jae Hoon ; Ahn, Tae Sang ; Choi, Jong Gwon ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 63~75
DOI : 10.7781/kjoss.2015.27.1.063
In this study, Composite beam flexural capacity was investigated experimentally using angle as a shear connector. The main experimental parameters are the size and the spacing of the angle and the overall behavior of before and after composite. Also, the composite beam bending performance when it used with hollow PC slab and the general RC slab was compared. When determining that it synthetically, the flexural capacity of the composite beam with angle shear connector estimated 25% to 55% more strength than the nominal strength. Effects of strength parameters of composite beam by angles shear connector are size and spacing of the angle. As expected, the larger and the narrower spacing of the angles, the more strength the composite beam have. In addition, the performance of the composite beam with a hollow slab was well demonstrated by the test.
A Study on the Development of Force Limiting Devices of Cross-Section Cutting Types
Kim, Cheol Hwan ; Chae, Won Tak ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 77~85
DOI : 10.7781/kjoss.2015.27.1.077
This paper describes the development of force limiting device(FLD). The FLD could induce compressive yield before occurring elastic buckling for slender member under compressive load. Therefore, it might prevent reduction of load carrying capacity by elastic buckling and the structures with the devices would behave stable. A new type of FLD reduced cross area is proposed in this study different to existing studies like as out of plane type, slit type and folded plate type. The parameters of specimens are depth, width and number of cutting. The structural capacity and characteristics of proposed types were verified by experiment and FEM analysis. The FLD of cutting type is efficient in compressive member.
Static Shear Resistance of Cast-In-Place Anchors in Cracked Concrete
Park, Yong Myung ; Ju, Ho Jung ; Kim, Dong Hyun ; Kang, Moon Ki ; Lee, Jong Han ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 87~97
DOI : 10.7781/kjoss.2015.27.1.087
In this study, an experimental study was performed to evaluate the concrete breakout strength of cast-in-place(CIP) anchors in cracked concrete under static shear loading. The CIP anchors involved in this study were 30mm in diameter with an edge distance of 150mm and an embedment length of 240mm. The experiment was carried out for two specimens in uncracked concrete and three specimens in cracked concrete orthogonal and parallel to the direction of shear loading, respectively. Compared to the uncracked concrete specimen, cracked specimen orthogonal to the direction of shear loading showed no reduction in the concrete breakout strength and that parallel to the load direction about 91% strength which corresponds to 84% of uncracked concrete strength defined in ACI 318-11. Therefore, the experimental results showed smaller decrease in the shear resistance of CIP anchors in cracked concrete than that specified in ACI code which account for 71% strength of uncracked concrete in cracked concrete.
Hysteresis Behavior of Partially Restrained Smart Connections for the Seismic Performance of Composite Frame
Kim, Joo Woo ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 99~108
DOI : 10.7781/kjoss.2015.27.1.099
The partially restrained smart CFT (concrete filled tube) column-to-beam connections with top-seat split T connections show various behavior characteristics according to the changes in the diameter and tightening force of the fastener, the geometric shape of T-stub, and material properties. This paper presents results from a systematic three-dimensional nonlinear finite element study on the structural behavior of the top-seat split T connections subjected to cyclic loadings. This connection includes super-elastic shape memory alloy (SMA) T-stub and rods to obtain the re-centering capabilities as well as great energy dissipation properties of the CFT composite frame. A wide scope of additional structural behaviors explain the influences of the top-seat split T connections parameters, such as the different thickness and gage distances of split T-stub.
Ultimate Flexural Strength of Cylindrical Steel Shell for Wind Tower
Ahn, Joon Tae ; Shin, Dong Ku ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 109~118
DOI : 10.7781/kjoss.2015.27.1.109
Ultimate flexural buckling strength of cylindrical steel shells for the wind turbine tower structure was investigated by applying the geometrically and materially nonlinear finite element method. The effects of initial imperfection, radius to thickness ratio, and type of steel on the ultimate flexural strength of cylindrical shell were analyzed. The flexural strengths of cylindrical shells obtained by FEA were compared with design flexural strengths specified in Eurocode 3 and AISI. The shell buckling modes recommended in DNV-RP-C202 and the out-of-roundness tolerance and welding induced imperfections specified in Eurocode 3 were used in the nonlinear FE analysis as initial geometrical imperfections. The radius to thickness ratios of cylindrical shell in the range of 60 to 210 were considered and shells are assumed to be made of SM520 or HSB800 steel.
Strength Evaluation of T-type Tubular Joints for Circular Section Multi-Column Wind Towers
Kim, Kyung Sik ; Park, Hyun Yong ; Seo, Dong Hyuck ;
Journal of Korean Society of Steel Construction, volume 27, issue 1, 2015, Pages 119~129
DOI : 10.7781/kjoss.2015.27.1.119
Due to reduced self weight and alleviated wind effect, the multi-column wind towers that consist of a number of circular tubes as vertical members interconnected with horizontal brace members can be a substitute for the large-scale single cylinder wind towers. It is critical to guarantee strengths of tubular joints where vertical and horizontal members are structurally connected in order to make the whole multi-column system behave as a single tower structure. In this study, strength evaluation has been conducted for T-type tubular joints that are applicable in multi-column towers. Four of available design codes, i.e., AISC, Eurocode3, ISO 19902, CIDECT have been investigated and predictor equations in the considered design codes were validated and discussed through parametric numerical study on slenderness ratios of chords and braces at joints.