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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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Deformation Capacity of Inverted V-Type Brace Strengthened by Built-up Non-welded Buckling Restraint Element
Kim, Sun Hee ; Moon, Ji Young ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 261~271
DOI : 10.7781/kjoss.2015.27.3.261
Steel concentrically braced frame is an efficient system that can acquire resistance against the lateral force of buildings with the least amount of quantity. In this study is intended to proceed on the research of schemes for reinforcement by supplementing previously installed H-formed brace with non-welded cold-formed plastic stiffening materials restricting the flexure and buckling and acquire a consistent strength on the tensile and compressive force. As for the measures of supplementing previously-installed inverted V-formed braced frame, stiffening materials in the previous studies were converted to weak-axial supplementing materials to suggest a specific scheme evaluating the structural function through an experiment of members, interpretation of members, and frame-focused experiment. Reinforced brace satisfied the requirement to be prevent AISC brace from being ruptured due to imbalanced strength in the beam.
Analytical Study on Effects of Gravity Load on Blast Resistance of Steel Compressive Members
Lee, Kyungkoo ; Lee, Moon Chang ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 273~280
DOI : 10.7781/kjoss.2015.27.3.273
Equivalent Single-Degree-of-Freedom(SDOF) analysis, most used for blast-resistant design, does not consider the effects of gravity load on the performance evaluation of blast resistance of structural members. However, since there exists gravity load on columns and walls of structures, the blast resistance of structural members should be evaluated considering gravity load on them. In this paper, an approach to reflect the gravity load effects on the equivalent SDOF analysis for dynamic blast response of structural members is proposed. For this purpose, the parametric studies using finite element analysis were performed by varying maximum blast load, blast load duration, and gravity load with constant the resistance and natural period of a structural member. The finite element analysis results were compared with the equivalent SDOF analysis results and the blast response of the structure member was estimated by conducting finite element analyses for various gravity loads. Finally, a graphical solution for ductility of a structural member with the variables of blast load, gravity load and structural member properties was developed. The blast response of structural members under gravity load could be estimated reasonably and easily by using this graphical solution.
Examination of Seismic Performance for Structure with Seismic Members made by High Strength Steel
Kim, Moonjeong ; Ha, Tae Uk ; Cho, Sukhee ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 281~288
DOI : 10.7781/kjoss.2015.27.3.281
Seismic members like damper do not have any treatment of preventing story stiffness reduction after elastic yielding of stories causing story collapse. This paper suggests a method able to prevent story stiffness reduction using high-strength steel. This paper suggests these also : (1) High-strength steel stud column reinforcing story stiffness reduction until story drift 0.02rad can be designed in small area without adjusting layout. (2) Suggested seismic member installing at lowest level shows effects to preventing deformation concentration under huge seismic waves.
Structural Behavior of Beam-to-Column Connections of Rectangular CFT Structures having Different Diaphragm Opening
Kim, Ki Hoon ; Lee, Myung Jae ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 289~298
DOI : 10.7781/kjoss.2015.27.3.289
The steel tube of Concrete-Filled Tube(CFT) confines the concrete and the concrete restrains the buckling of the tube, The objective of this study is to investigate the influences of the opening shape of the through diaphragm in case of the rectangular CFT column-to-beam connection through the structural experiment. The experiment results are compared with analysis results obtained by using the FEM program. These results are shown that strength of the rectangular CFT column-to-beam connection have similar structural performance regardless of the opening shape if opening areas of the through diaphragm are same. Also in case the connection area/shape of the through diaphragm and the flange of H-beam are similar, it was ascertained that the bending stress occurred at the beam can be transferred to the column through the diaphragm.
Structural Characteristics of Beam-to-Column Connection of Circular CFT Columns by Using Mixed Diaphragms
Wang, Ning ; Lee, Myung Jae ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 299~310
DOI : 10.7781/kjoss.2015.27.3.299
CFT(Concrete-Filled Tube) structures have problems at processing cause closed section and concrete filling problems. In this study, a CFT structure that uses different types of diaphragms in its upper and lower connections to improve the concrete filling was tested and analyzed via the FEM program. Implementation of variable analysis of EP-T type to find out the reason that effect on the resistance force of the connection. As a result, through experiments and analysis investigated the structural characteristics of circular CFT beam-to-column connection.
Test Results on the Type of Beam-to-Column Connection using SHN490 Steel
Kim, So Yeong ; Byeon, Sang Min ; Lee, Ho ; Shin, Kyung Jae ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 311~321
DOI : 10.7781/kjoss.2015.27.3.311
In this study, an experimental study to evaluate the seismic performance of beam-to-column connection for medium and low-rise building was conducted. Five connections using SHN490 steel were made with test variables such as flange welded or bolted, web welded or bolted. Specimen SHN-W-W is web welded and flange welded type. Specimen SHN-W-B is web welded and flange bolted type. Specimen SHN-B-W is web bolted and flange welded type. Specimen SHN-B-B is web bolted and flange bolted type. Specimen SHN-EP is a connection with the end plate to the beam ends. Cyclic loadings was applied at the tip of beam following KBC2009 load protocol. The load vs rotation curves for different connection are shown and final failure mode shapes are summarized. The connections are classified in terms of stiffness and strength as semi-rigid or rigid connection. Energy dissipation capacities for seismic performance evaluation were compared.
Seismic Behavior of Non-Seismic Concentrically Braced Frames with Shared Shear tab
Yeom, Hee Jin ; Jung, Eun Bi ; Yoo, Jung Han ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 323~332
DOI : 10.7781/kjoss.2015.27.3.323
Special concentrically braced frames(SCBFs) have distinctive advantages in considerable seismic performance, which make engineers widely use SCBFs as lateral-load resisting systems in buildings and have researchers to develop SCBFs design methods. Compared to the extensive research of SCBF, comparatively little information is currently available on the performance of SCBFs designed and constructed before the early 1990`s. Prior to 1988, concentrically braced frames(CBFs) design requirements were substantially less restrictive. As a result, many existing structures designed to these requirements may not ensure ductility and pose a significant concern in current buildings. In this study, these older frames are referred as non-seismic braced frames(NCBFs). In order to investigate the seismic behavior of NCBFs, finite-element(FE) models of SCBF and NCBF were suggested and verified using case investigation of NCBF conducted on the University of Washington. Using these models, the seismic behavior of NCBF with shared welding shear tab, which is the representative of the types of connections, was established and compared with the seismic performance of SCBF.
Shear Strength of Hairpin Reinforced Cast-In-Place Anchors by Static and Seismic Qualification Tests
Kim, Dong Hyun ; Park, Yong Myung ; Kim, Tae Hyung ; Jo, Sung Hoon ; Kang, Choong Hyun ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 333~345
DOI : 10.7781/kjoss.2015.27.3.333
This study evaluated the static and dynamic shear strength of cast-in-place anchors reinforced with hairpin bars in uncracked and cracked concrete. The anchors 30mm in diameter reinforced with D10 hairpin bar were designed with an edge distance of 150mm and an embedment depth of 240mm. The cracked specimens consisted of the orthogonal and parallel cracks to the direction of shear loads, respectively. The dynamic strength was evaluated using seismic qualification tests based on the ACI 355.2 standard. The shear strength of the hairpin reinforced anchor was hardly correlated to the concrete cracks and the dynamic strength was similar to its static shear strength. Finally, a consideration on the design strength of hairpin reinforced anchors was presented.
Shear Resistance of Unreinforced Cast-In-Place Anchors in Uncracked and Cracked Concrete by Seismic Qualification Tests
Park, Yong Myung ; Kim, Tae Hyung ; Kim, Dong Hyun ; Jo, Sung Hoon ; Lee, Jong Han ;
Journal of Korean Society of Steel Construction, volume 27, issue 3, 2015, Pages 347~357
DOI : 10.7781/kjoss.2015.27.3.347
In this study, an experimental study was performed to evaluate the concrete breakout strength of unreinforced cast-in-place anchors by seismic qualification test under shear loading. The CIP anchors tested herein were 30mm in diameter with an edge distance of 150mm and an embedment depth of 240mm in uncracked and cracked concrete. The cracked specimen consisted of orthogonal and parallel crack to the loading direction, respectively. The dynamic loading sequence during the seismic qualification test was determined based on CSA N287.2, ACI 355.2 and ETAG 001 codes. After the dynamic loading, the static loading was applied until failure occurs. The shear resistance by seismic qualification tests showed almost the same strength as that obtained from the static tests in uncrcaked and cracked concrete, respectively. Meanwhile, the breakout depth did not reach
, therefore the modified strength equation of ACI 318-11 could estimate properly the concrete breakout strength, which does not consider effective bearing length.