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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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A Study on Repair/ Retrofit for Deteriorations of Steel Bridge -Behavior Characteristics of Welded Joint Part of Flange and Repair/Retrofit of Fatigue Crack in Railway Steel Bridge-
Kyung, Kab Soo ; Lee, Sung Jin ; Park, Jin Eun ; Cha, Cheol Jun ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 613~625
DOI : 10.7781/kjoss.2012.24.6.613
Since railway bridge frequently have a chance of passing train load close to design load, it is necessary to reflect sufficiently fatigue property in early design phase for many structural details. Nevertheless fatigue cracks are reported partly in deck plate girder of railway steel bridge because of the weight and arrangement of axial load acting on railway bridge, the application of improper structural details for fatigue problem etc.. One of main cause for fatigue crack at the welded part of upper flange and web is caused by the eccentricity action of train load due to the difference of center to center spacing between the main girder supporting sleeper and the rail acting train load. For the existing deck plate girder of railway steel bridge, in this study, field survey, field measurement and a series of structural analysis were performed. In addition, the characteristics of structural behavior, the causes and repair/ retrofit of fatigue crack were examined in the target bridge.
A Study on Compressive Strength of Built-up H Shaped Columns Fabricated with HSA800 High Performance Steels
Kim, Tae Soo ; Lee, Myung Jae ; Oh, Young Suk ; Lee, Kang Min ; Kim, Do Hwan ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 627~636
DOI : 10.7781/kjoss.2012.24.6.627
Recently, high performance(strength) steels have been utilized to structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. This paper is a series of basic study for the design specification of structural members using high performance steel, material properties of high performance rolled steel building structures; material properties of HSA800 steel was compared with the requirements of Korean Standards(KS) for HSA800. Welded H-shape stub columns with variables of width-to-thickness ratios are planned in order to investigate the local buckling behaviors and check the current design limit of width-to-thickness ratio and uniaxial compressive tests are carried out. In addition, the buckling behaviors of stub columns obtained finite element analysis were compared with those of test results.
The Composite Effects of Composite Truss using High Strength T-shaped Steel
Chae, Dae Jin ; Lee, Myung Jae ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 637~645
DOI : 10.7781/kjoss.2012.24.6.637
The composite action in truss beam is generally achieved by providing shear connectors between the steel top chord of the truss and the concrete slab. The composite sections have greater stiffness than the sum of the individual stinesses of the slab and truss. Therefore, steel trusses that act compositely with concrete slabs can carry larger load and are stiffer and less prone to transient vibration. The crack pattern and deflection of the beam of the composte truss were investigated by using of 600MPa class steel in this study. The test results were compared with the results for the noncomposite trusses. Test results were also compared with the results of composite trusses by using of 400MPa class steel. It was ascertained that the case of high strength steel is more efficient compared with the case of SS400 steel for T-shaped steel.
An Experimental Study on Failure Behavior of TP316 Stainless Steel Pipe with Local Wall Thinning and Cracking
Cheung, Jin Hwan ; Kim, In Tae ; Choi, Seock Jin ; Choi, Hyung Suk ; Kim, Hee Sung ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 647~657
DOI : 10.7781/kjoss.2012.24.6.647
Although nuclear power plant piping system is designed conforming to design specifications, the piping systems are deteriorated with increase in service life. In this study, monotonic and cyclic loading tests were carried out on TP316 stainless steel pipe specimens, and the effect of local wall thinning and cracking on failure behavior was investigated. In the tests, 0%, 35% and 75% wall thinning and cracking of initial thickness were artificially introduced to inside elbow and straight pipe specimens, and internal pressures of 20MPa were applied to simulate real operation condition. From the test results, the effect of local wall thinning and cracking on failure mode, ultimate load, number of cycle and strain energy was presented, and maximum bending moment was compared with allowable bending moment calculated by ASME code.
Formulating the Local Displacement and Local Moments of a Plate Stiffened with Open Ribs According to the Dimensions of Stiffened Plates
Chu, Seok Beom ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 659~670
DOI : 10.7781/kjoss.2012.24.6.659
The purpose of this study is to formulate the local displacement and moments of a plate stiffened with open ribs according to the dimensions of stiffened plates. Analyzed results of various plates stiffened with rectangular and reverse T ribs show that the effect of the lower flange to the local behavior is very small, so the local behavior can be expressed by ratio functions of the rib space, web thickness, web height and plate thickness and the ratio functions of rectangular and reverse T ribs can be unioned. The application of ratio functions to other types of stiffened plates shows that the increment of the error ratio is so small compared with examples of this study that the applicability of this study is proved.
Discrete Optimum Design of Sinusoidal Corrugated Web Girder
Shon, Su Deok ; Yoo, Mi Na ; Lee, Seung Jae ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 671~682
DOI : 10.7781/kjoss.2012.24.6.671
The use of sinusoidal corrugated web girder for the box-type girders and gable steel main frames has recently been increasing very much. The reasons are that the thin web of the girder affords a significant weight reduction compared with rolled beam and welded built-up girder, and that corrugation prevents the buckling failure of the web. Improvements of the automatic fabrication process makes mass production of the corrugated web and unit possible, and applications of this girder have been extended considerably. Thus, the research for the optimum design processer considering the production data is needed practically. For doing this research, we develope the discrete optimum structural design program in consideration of production list data for the research, and the program apply to the single girder under the uniform load and the concentrated load as numerical example. We consider objective function as minimum weight of the girder, and use slenderness ratio, stress of flanges and corrugated web, and the girder deflection as the constraint functions. And also the Genetic Algorithms is adopted to search the global minimum point by using the production list as a discrete design variable. Finally, to verify the optimality of the design, we conduct a comparison of the results of the discrete optimum design with those of the continuous one, and also analyze the characteristics of the optimum cross-section.
Experimental Study for Ultimate Behavior of Steel Cable Stayed Bridge Under Construction
Lee, Kee Sei ; Kim, Seung Jun ; Choi, Jun Ho ; Kang, Young Jong ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 683~692
DOI : 10.7781/kjoss.2012.24.6.683
The girders of cable stayed bridge are subjected to not only the bending moments but also additional compressive axial forces due to the horizontal components of cable forces. Because of these axial forces, the stiffness of girder can be decreased, and this problem should be considered especially for under-construction model rather than the full model. Korean domestic design specification suggests the linear elastic eigen value analysis for the stability problem of cable stayed bridges. However, this method cannot be applied to the under construction model because various geometric nonlinear characteristics cannot be considered. Therefore, in this study, 3 models which are assumed to be constructed by balanced cantilever will be considered experimentally and analytically to analyze the behavior of steel cable stayed bridges.
Effects of Welding Processes on the Low Temperature Impact Toughness of Structural Steel Welded Joints
Lee, Chin Hyung ; Shin, Hyun Seop ; Park, Ki Tae ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 693~700
DOI : 10.7781/kjoss.2012.24.6.693
In this study, the Charpy impact test along with metallurgical observation was conducted to evaluate low temperature impact toughness of structural steel welds with different welding processes to find out the optimal welding process to guarantee the required impact toughness at low temperatures. The welding processes employed are shield metal arc welding (SMAW) and flux cored arc welding(FCAW), which are commonly used welding methods in construction. The Charpy impact test is a commercial quality control test for steels and other alloys used in the construction of metallic structures. The test allows the material properties for service conditions to be determined experimentally in a simple manner with a very low cost. To investigate the impact toughness at low temperatures of the steel welds, specimens were extracted from the weld metal and the heat affected zone. Standard V-notch Charpy specimens were prepared and tested under dynamic loading condition. The low temperature impact performance was evaluated based on the correlation between the absorbed energy and the microstructure. Analysis of the results showed that the optimal welding process to ensure the higher low temperature impact toughness of the HAZ and the weld metal is SMAW process using the welding consumable for steels targeted to low temperature use.
Optimum Design of Steel Structures Using Genetic Algorithms
Kim, Bong Ik ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 701~710
DOI : 10.7781/kjoss.2012.24.6.701
We present optimum design for truss and frame structures subject to constraints on stresses, displacement, and natural frequency. The optimum design procedure is used discrete and continuous design variables and Genetic Algorithms. Genetic Algorithms is used the method of Elitism and penalty parameters in order to improved fitness in the reproduction process, and optimum design is used steel(W-section) and pre-made discrete cross-section. Truss and frame structures optimization examples are used for 10-Bar truss, 25-Bar truss, 1-bay 2-story frame, 1-bay 7-story frame, and these examples are employed to demonstrate the availability and serviceability of Genetic Algorithms for solving optimum design of truss and frame.
Structural Performance of High-Strength Concrete-Filled Steel Tube Steel Columns using Different Strength Steels
Choi, In Rak ; Chung, Kyung Soo ; Kim, Jin Ho ; Hong, Geon Ho ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 711~723
DOI : 10.7781/kjoss.2012.24.6.711
Structural tests were performed to investigate the structural performance of concrete-filled steel tube column using different strength steels in their flange and web with high-strength steel HSA800 and mild steel SM490, respectively. The test parameters included the strength of column flange and infill concrete, and effect of concrete infill. Connection between different grade steels were welded using the electrode appropriate for mild steel and verified its performance. To evaluate the behavior of test specimens, eccentric loading tests were performed and the results were compared with the prediction by current design codes. Axial load and moment carrying capacity of test specimens increased with the yield strength of compression flange and weld fracture occurred after the specimen shows full strength. The prediction result for axial load-bending moment relationship and effective flexural stiffness gave good agreement with the test result.
Evaluation of Flexural Behavior of a Modular Pier with Circular CFT
Ma, Hyang Wook ; Oh, Hyun Chul ; Kim, Dong Wook ; Kong, Davon ; Shim, Chang Su ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 725~734
DOI : 10.7781/kjoss.2012.24.6.725
A new modular pier system using concrete filled circular steel tubes was suggested to realize modular bridge substructures for accelerated bridge construction. Structural details and connection details were proposed by connection multiple concrete filled tubes (CFT) for standardized products of fabrication, delivery and erection. Static tests were performed for the modular pier with suggested details under lateral load conditions for weak and strong axes. Due to the eccentricity by the bracing system, the modular pier showed 5.23 times higher flexural stiffness and 6 times greater flexural strength from the test. It is proper for the rational design to evaluate stress and deformation by frame modeling of the modular CFT pier. Structural capacity of the pier can be obtained by adjusting the spacing of the CFT columns. Design recommendations were derived from the test.
Concentrated Axial Loading Test for Slender Square Hollow Section Retrofitted by Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets)
Park, Jai Woo ; Choi, Sun Kyu ; Choi, Sung Mo ; Song, Dong Yub ; Yoo, Jung Han ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 735~742
DOI : 10.7781/kjoss.2012.24.6.735
This paper presents the experimental results of axially loaded stub columns of slender steel hollow square section(SHS) strengthened with carbon fiber reinforced polymers(CFRP) sheets. 6 specimens were fabricated and the main parameters were: width-thickness ratio(b/t) and CFRP retrofitting. From the tests, it was observed that two sides would typically buckle outward and the other two sides would buckle inward. A maximum increase of 33% was achieved in axial-load capacity. Also, stiffness and ductility index(DI) were compared between unretrofitted specimens and retrofitted specimens. In the last section, a prediction formula of the ultimate strength developed using the experimental results is presented.
Experimental Study on the Behavior of Circular Steel Tube Columns using HSB600 Steel
Kim, Sun Hee ; Choi, Young Hwan ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 24, issue 6, 2012, Pages 743~751
DOI : 10.7781/kjoss.2012.24.6.743
This paper investigates an experimental behavior of circular columns and beam-columns made of HSB600 high strength steel as a fundamental study to enhance the applicability of HSB steel. The applicability of the current Standard such as KBC and Eurocode 3 is also evaluated. A total of six specimens are fabricated and tested. The main parameters are slenderness ratio(KLe/r = 12, 14, 40, 65), diameter-to-thickness ratio(D/t = 25, 40), and eccentricity ratio(e/D = 0, 0.5). It is drawn from the experiment that both the KBC and Eurocode 3 can be used to predict the strength of circular columns and beam-columns made of HSB600 high strength steel.