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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 23, Issue 6 - Dec 2011
Volume 23, Issue 5 - Oct 2011
Volume 23, Issue 4 - Aug 2011
Volume 23, Issue 3 - Jun 2011
Volume 23, Issue 2 - Apr 2011
Volume 23, Issue 1 - Feb 2011
Selecting the target year
Improving Fatigue Strength of Weld Joints by Blast Cleaning used in Painting Steel Bridge
Kim, In-Tae ; Jung, Young-Soo ; Lee, Dong-Uk ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 137~146
In the fabrication of steel bridges, blast cleaning prior to painting is carried out on the steel members to clean the forged surface and to increase the adhesive property of the applied painting systems. The effect of blast cleaning on the fatigue strength improvement of the weld joints, however, is not clear. In this study, Almen strips and steel specimens were blast-treated, conforming to ten types of blast-cleaning conditions deducted from the blast-cleaning conditions of seven steel structure fabrication companies. The arc height, roughness, hardness, and compressive residual stress were measured before and after the implementation of the ten blast-cleaning methods, and the relationship between the blast conditions and the measured values was studied. The geometry of the weld toe and the compressive residual stress near the weld toe were also measured before and after the blast cleaning of the butt-welded joints, and fatigue tests were carried out on the butt weld joints. The test results showed that blast cleaning significantly increases the fatigue strength and limit.
The Suggestion of Seismic Performance Values on Connections for Performance Based Design of Steel Structures
Oh, Sang-Hoon ; Oh, Young-Suk ; Hong, Soon-Jo ; Lee, Jin-Woo ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 147~158
The purpose of this research was to analyze the connections of the seismic-performance values for domestic-performance-based designs. Basic research on the performance design method has been increasing of late, along with performance-based organization investigations. These investigations concern the performance level state of steel structure buildings. According to the performance limit state, seismic-performance values should be presented as appropriate steel structure engineering amounts. The first step, based on the full-scale steel structure experiments, involves researching on the making of a basic document. The moment-rotation angle relationship results of the experiment on the moment-frame connection were used to assort the functional and undamaged limits, which were assumed to be less than the yield moment. Moreover, the repairable and safety limits, which were assumed to exist between the yield and maximum moments, were assorted by investigating the accumulated plastic deformation ratio.
Study on Crack Monitoring System in Steel Structure
Lee, Jae-Sun ; Chang, Kyong-Ho ; Hwang, Jee-Hoon ; Park, Hyun-Chan ; Jeon, Jun-Tai ; Kim, You-Chul ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 159~167
Steel structure construction is currently increasing on account of the many merits of steel structures. Due to numerous environmental factors, many cracks and extensive corrosion occur in steel structures, which cause the deterioration of the performance and life cycle of such structures. Maintenance of steel structures is thus strongly demanded, for safety control. The inspection methods that are currently being used, however, are very limited and can detect only local defects in steel structures. They also take much time to use and incur high maintenance costs. Moreover, such methods cannot be applied to huge steel structures, which men find unapproachable. They also require much time due to the need for periodic checks, and may lead to cost loss. Therefore, the development of a monitoring system that can detect defects in whole structures and can reduce the repair and strengthening costs at an early stage is very much needed. In this study, the generation and propagation of cracks were monitored via the electric-potential-drop method (EPDM).
In-plane Bending Moment Capacity of T-Joints in the Circular Hollow Section of New High Strength Steel Subjected to Cyclic Loadings
Lee, Sung-Ju ; Kim, Joo-Woo ; Kim, Sang-Seup ; Lee, Myung-Jae ; Yang, Jae-Geun ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 169~177
This paper presents the results of the systematic finite element analysis of the in-plane bending moment of T-joints subjected to cyclic loadings. T-joints were fabricated using high-strength, circular, hollow sections. Three-dimensional, nonlinear finite element models of the welded T-joints were constructed to investigate the strength, rotational-stiffness characteristics, and failure modes. A wide scope of structural behaviors explain the influence of the joint geometric parameters, such as the chord and brace wall slenderness ratios and the ratio of the brace to the chord diameter, as well as the yield strength ratios and compressive-chord-stress effects on the ultimate in-plane bending moment capacity of the T-joint.
A Study about Behavior of Steel Column Members under Varying Axial Force
Oh, Sang-Hoon ; Oh, Young-Suk ; Hong, Soon-Jo ; Park, Hae-Yong ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 179~188
The performance-based design is highlighted as an alternative for the current design method, which cannot definitely specify the performance level that a building requires. Research on it is already in progress, however, in developed countries like the United States and Japan, to establish the basis for a performance-based design. Many studies on such design are also being conducted in South Korea, but South Korea still lags behind other countries in all-around technology. On the other hand, the column members, especially the lower external column, are affected by the variation of the axial force by overturning the moments in the case of lateral loads by earthquake. Varying the axial force can affect the time of local buckling and the ultimate behavior. Thus, in this study, the structural performance, such as the time of local buckling and the ultimate behavior, was analyzed through an experimental study on column members under varying axial force. The feasibility of a domestic study proposing a performance level with a story drift angle formed about a structural-performance-based steel structure design was also verified.
Seismic Performance Evaluation of Freeform Diagrid System
Ko, Chang-Kyun ; Ju, Young-Kyu ; Kim, Sang-Dae ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 189~198
Many new structural systems have been developed to build free-form structures, which is the new architectural trend for aesthetic beauty. The diagrid system resists both gravity and later loads, with its perimeter-diagonal columns. In the current seismic-design provisions, however, a seismic-performance factor for a new structural system has not yet been provided. ATC-63 provides a new methodology for defining various seismic-performance factors, including the response modification factor. In this paper, nonlinear static and dynamic analyses were conducted for the 3D diagrid frame, with each load applied at
degrees. Through these analyses, the seismic performance of the diagrid system was evaluated.
Evaluation of Cable Impact Factor by Moving Vehicle Load Analysis in Steel Composite Cable-Stayed Bridges
Park, Yong-Myung ; Park, Jae-Bong ; Kim, Dong-Hyun ; Choi, Byung-Ho ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 199~210
The cables in cable-stayed bridges are under high stress and are very sensitive to vibration due to their small section areas compared with other members. Therefore, it is reasonable to evaluate the cable impact factor by taking into account the dynamic effect due to moving-vehicle motion. In this study, the cable impact factors were evaluated via moving-vehicle-load analysis, considering the design parameters, i.e., vehicle weight, cable model, road surface roughness, vehicle speed, longitudinal distance between vehicles. For this purpose, two steel composite cable-stayed bridges with 230- and 540-m main spans were selected. The results of the analysis were then compared with those of the influence line method that is currently being used in design practice. The road surface roughness was randomly generated based on ISO 8608, and the convergence of impact factors according to the number of generated road surfaces was evaluated to improve the reliability of the results. A9-d.o.f. tractor-trailer vehicle was used, and the vehicle motion was derived from Lagrange's equation. 3D finite element models for the selected cable-stayed bridges were constructed with truss elements having equivalent moduli for the cables, and with beam elements for the girders and the pylons. The direct integration method was used for the analysis of the bridge-vehicle interaction, and the analysis was conducted iteratively until the displacement error rate of the bridge was within the specified tolerance. It was acknowledged that the influence line method, which cannot consider the dynamic effect due to moving-vehicle motion, could underestimate the impact factors of the end-cables at the side spans, unlike moving-vehicle-load analysis.
Optimization Design Process of Diagrid Node for Tall buildings
Kim, Sang-Dae ; Bae, Jae-Hoon ; Ju, Young-Kyu ; Kim, Young-Ju ; Kim, Do-Hyun ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 211~220
The diagrid structure is now one of the trends in tall-building structures. It is preferred not only because of its distinctive appearance but also because of its structural advantages. There are few diagrid buildings that actually exist, however, because of the nodes, which are difficult to make and cost too much. In this study, a node-type diagrid building material with a more efficient structure but with fewer diagrid nodes, fabricated using the finite element method, was proposed and validated via experimentation.
Buckling Behaviors of Plate Girder with Corrugated Steel Web
Ji, Hyo-Seon ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 221~228
Because steel plate girder bridge has big slenderness ratio, buckling is a major design factor. The objective of this study is to analyze the buckling behaviors of plate girder with I-girder and corrugated steel web and to examine the advantages of plate girder with corrugated steel web. Various parametric study according to the change of web height, web thickness, and load condition are examined. It is shown that plate girder with corrugated steel web is more effective than plate girder with I-girder and proper corrugated angle(
Compression Behavior of Steel Plate-Concrete Structures with the Width-to-Thickness Ratio
Han, Hong-Soo ; Choi, Byong-Jeong ; Han, Kweon-Gyu ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 229~236
This study was conducted to understand the characteristics of the compression behavior of steel plate-concrete(SC) structures with a width-to-thickness ratio under axial loading. SC structures are structural systems where concrete is poured into steel plates to which headed stud bolts had been attached inside. The specimens were classified according to the two width-to-thickness (W/T) ratios of 1.60 and 3.56. Through these experiments, the following conclusions could be arrived at. The fracture pattern of the specimens showed that steel plate buckling occurred between the stud lines, and that a crack occurred at the concrete spalling from the sides of the concrete before the system reached the maximum compressive strength. The maximum compressive strength of the specimens was larger than that of the existing equations (AISC 2005, ACI 318-05, and KBC 2005). With the increased W/T ratio of the specimens, the strength of the concrete core was decreased to account for the confinement effects from the steel plates.
An Improved Initial Force Method for Determining the Initial Configuration of Suspension Bridges
Kim, Min ; Kim, Ho-Kyung ; Kim, Moon-Young ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 237~247
This paper presents an improved initial force method for determining the initial shape of suspension bridges. After determining the initial shape factors through the force equilibrium conditions of each hanging point, the initial force method was applied with the computed values, each node's coordinates, and unstrained lengths of the cable element as inputs. The unstrained length of each cable element was regarded as a fixed value in each iteration step, unlike in the typical initial force method. This method can be applied to 2D and 3D suspension bridge models. The validity of the present method was demonstrated by comparing the results of the numerical examples.
Evaluation of Internal Bracing Member Forces due to Distortional Behaviors of Tub Section Steel Box Girders
Kim, Kyung-Sik ;
Journal of Korean Society of Steel Construction, volume 23, issue 2, 2011, Pages 249~259
In this study, the distortional behaviors of tub-section steel girders subjected to torsional loading were analyzed, and predictor equations were developed for estimating the member forces induced in the internal bracing system installed in the steel tub girders. Torsional loadings originated either by eccentric vertical loading or girder curvature were decomposed into the pure torsional force component that does not affect the distortional box deformation, and into the distortional force component that directly induces box distortion. The axial member forces induced in the internal cross frames were formulated as a function of the magnitude of torsional loading through the analytical investigation of the interactions between the distortional force component and internal cross frames. To verify the proposed equations, three-dimensional finite element analysis (3D FEA) was conducted for the straight simple-span girder and the three-span continuous girder samples. Very good agreement was found between the member forces from the FEA and the proposed equations.