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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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Korean Society of Steel Construction
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Volume & Issues
Volume 18, Issue 6 - 00 2006
Volume 18, Issue 5 - 00 2006
Volume 18, Issue 4 - 00 2006
Volume 18, Issue 3 - 00 2006
Volume 18, Issue 2 - 00 2006
Volume 18, Issue 1 - 00 2006
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Vibration Analysis of Circular Plate with Continuously Varying Thickness
Shin, Young Jae ; Jaun, Su Ju ; Yun, Jong Hak ; Yoo, Yeong Chan ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 1~10
paper presents the results of the use of the differential transformation technique in analyzing the free vibration of circular plates.calculations were carried out and were compared with previously published results. The results that were obtained when this method was used coincide with the results of The present analysis shows the usefulness and validity of differential transformation in solving a solid-circular and annular-plate problem in terms of free-vibration responses.
Fatigue Field Test of Variable Message Sign Structure and Evaluation of AASHTO Specifications
Park, Jong Sup ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 11~22
Message Signs (VMS) structures offer an increase in traffic safety through their ability to relay massages to motorists for warnings of hazards ahead, traffic congestion, accidents, and lane closings. The geometry of these signs sometimes results in the significant cyclic loading of the supports structure due to wind gusts, which can result from passing trucks or from natural wind. This study presents the results of analytical and experimental investigations of VMS structures. The commercially available softwareGTSTRUDL (2003) was used to perform space-frame structural analyses of these welded tubular structures. Fatigue evaluations were performed using stress ranges from field measurements and from structural analyses. Based on the results of the structural analyses that were conducted, where fatigue design loadings that had been derived from AASHTO Specifications for Structural Supports for Highway Signs, Luminaries, and Traffic Signals (2001) were used, the structures that had been studied were found not to have infinite fatigue life. According to the limited measurements that were made in this study, the fatigue design loadings derived from AASHTO Specifications (2001) appear to be conservative, but they are not overly conservative. The results of this study should be used to make a reasonable design of VMS structures, and to maintain their standards.
Improvement of the Design and Construction Technique of Orthotropic Steel Deck Bridges : Fatigue Strength of Three Dimensional Full-scaled Model
Oh, Soon Taek ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 23~32
This study was conducted to improve the design and construction technique of orthotropic steel-deck bridges. After conducting an F.E.M. analysis of the various rib types of the connection details, static and fatigue tests were conducted, using a three-dimensional, full-scaled, orthotropic, steel-deck-plate model with internal diaphrams, to check the fatigue strength depending on the types of details. The model structure was made of two types of longitudinal ribs: the domestic standard and the European rabbit types. The fatigue strength of the steel-deck system was found to have improved through the installation of an internal diaphram, as no cracks were found on the bottom round part of the scallop with a diaphram. There were no differences between the domestic and the European types of details in terms of strength may be partially influenced by the shape of the scallop and by the installation of an internal diaphram, but it can be improved more significantly according to the quality of the welding that will be done.
Wind Tunnel Aeroelastic Studies of Steel Cable-stayed Bridge with Wind Cable and Temporary Support
Cho, Jae Young ; Shim, Jong Han ; Lee, Hak Eun ; Kwon, O Whon ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 33~45
Cable-stayed bridges are more inherently vulnerable to wind during the erection stages than when they are already being used. Even if a bridge that is already being used is aerodynamically stable, it is prone to having aerodynamic instabilities within the design wind speed during construction. Therefore, when the bridge's designers deliberate on the method they will use in constructing the bridge, they must likewise come up with a suitable plan to ensure the stability of the bridge during its erection (e.g., conducting a wind-tunnel investigation). This paper describes the aeroelastic full-bridge model tests that were conducted to investigate the aerodynamic behavior of the bridge during erection, with emphasis on aerodynamic stability and the mitigation of the buffeting response through temporary stabilization. The aerodynamic performance of a cable -stayed bridge with a main span of 50 m was studied in its completed stage and in two erection stages, corresponding 50% and 90% completion, respectively. In the 50% erection stage tests, a balanced cantilever configuration, with wind cable and temporary support at the tower, was conducted. The system that was determined to be most effective in reducing wind action on the bridge during construction was proposed in the paper, based on the results of the comparative study that was conducted.
A Study of Analysis Method for the Track geometry measuring data on High Speed Railway
Kang, Kee Dong ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 47~51
Measuring the track geometry of a high-speed railway is the most important task in track construction and track maintenance work. Measuring accuracy is particularly sign the formulation of the maintenance plan and in the assessment of the work quality, and because it can set the train speed limit. To determine the track geometry of a high-speed railway, it is important to use KNR's track recording coach (EM-120). According to the result of the spectrum analysis, noise near the 1-m wave band was found on the track recording data. A new filter was thus applied to remove the noise from the track recording data. A similar result can be acquired when this method is used in real track geometry.
Verification of bridges Design criteria for Continuous PSC Box Bridge of High Speed Railway Using Field Test
Kang, Kee Dong ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 53~58
The aim of this paper is to verify the dynamics stability of the continuous PSC Box bridges on the high-speed Kyoung-bu railway when a high-sped train runs through it. An experimental study was carried out to investigate the dynamic behaviors of the PSC Box railway bridge, which had ben designed based on dynamic design criteria. As a result, it was determined that PSC Box railway bridges possess enough dynamics stability for use by high-speed trains. According to the result of a field test (dynamics measuring analysis) that was conducted, an application of the natural frequency of train speed and the adjustment of the bridge's span length will allow one to come up with a more economical and suitable bridge design. Furthermore, it was found that the continuous control of the bridge's dynamic behavior and the bridge's maintena nce require the recording of data. The results of this study are very important in evaluating the structural stability of high-speed line bridges.
A Balanced Panel Zone Strength Criterion for Reduced Beam Section Steel Moment Connections
Lee, Cheol Ho ; Kim, Jae Hoon ; Jeon, Sang Woo ; Kim, Jin Ho ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 59~69
This paper presents test results on reduced beam section (RBS)program addressed panel zone (PZ) strength as the key variables. PZ strength has been much debated issue for several decades. A desirable range of PZ strength has not yet been proposed despite the fact that a significant amount of RBS test data is available. Test results from this study and by others showed that panel zones could easily develop a plastic rotation of 0.01 radian without causing distress to the beam flange groove welds. At this deformation level, the amount of beam distortion (i.e., buckling) was about one half that developed in strong PZ specimens. A criterion for a balanced PZ strength that improves the plastic rotation capacity while reducing the amount of beam buckling is proposed.
Plastic Analysis of Steel Plate Shear Panels using Strip Model
Lee, Myung Ho ; Moon, Tae Sup ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 71~80
The behaviors of steel-plate shear panels were investigated through an experimental and analytical study, using mild steel (S40). Steel-plate shear panels buckle at small loads, and their strength is based on the shear panel's postbuckling strength due to tension field action. In design practice, however, the capacity of steel-plate shear panels is limited to the elastic buckling strength of shear panels. Th e National Standard on Limit States Design of Steel Structures, CAN/CSA-S16.1-94 (1994) contains a guideline for the analysis of thi n, unstiffened, steel-plate shear walls using the strip model. In this paper, the structural capacity of shear panels was evaluated using the results of the experiment and of the strip model analysis.
A Study on the Geometric Parameters that Influence the Trapezoidally Corrugated Webs Under Partial Edge Loading
Choi, Yong Ju ; Yi, Jong Won ; Shin, Chul Ho ; Lee, Hak Eun ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 81~91
The corrugated web is a plate that was manufactured with a corrugated shape. It is widely used in bridges, buildings, and culverts. A girder with a corrugated web can be crippled by local, in-plane compressive loads. Due to its high out-of-plane strength, however, a stiffener is usually not needed in trapezoidally corrugated plates, and the corrugated profile of the web can change the boundary condition of the edge load. Some researchers have studied the strength of the partial-edge loading of the trapezoidally corrugated web, but they have not considered the profile of corrugation in their studies. This paper investigates the influence of the corrugate profile. A parametric study was conducted on the shape parameter using the finite-element method. In this parametric study, the relationship between the corrugated shape and the partial-edge strength was also investigated by dividing the partial-edge strength into the web capacity and the flange capacity.
Vibration Analysis of Special Orthotropic Laminated Composite Plates under Axial Loadings
Won, Chi Moon ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 93~100
A simple but precise method of calculating the natural vibration frequencies of composite laminated plates with all-simple support and under axial loadings is presented herein. This method uses deflection influence surfaces, which can be obtained by any method for vibration analysis and member due to the inertia force under resonance condition. Beginning with an initially guessed mode shape, the exact mode shape is obtained by the process similar to iteration. In this paper, equations are given for the case of special orthotropic laminates. The same equations, however, can be used for any laminate as long as
are negligible as the number of plies increases. Some laminates that possess such properties are presented in the paper.
A Study on the Applicability of SCP Girder to Continuous Bridges
Kim, Jung Ho ; Lee, Sang Yoon ; Park, Kyung Hoon ; Hwang, Yoon Koog ; Yoo, Gun Woo ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 101~111
The SCP girder, which compensates for the shortcomings of conventional girders through the effective composition of concrete, steel, and PS tendon, has recently been developed and applied on real bridges. Developed as a simple-support type, it may be applied on simple-support and continuous bridges by connecting the simple-support SCP girders to the interior supports. A continuous SCP girder, which has structural and cost advantages over the simple-support SCP girder, is proposed in this study. Likewise proposed herein is a new method of constructing a continuous SCP girder, using segments of the girder sequentially. A two-span, half-scale specimen was designed and constructed to verify the propriety of the continuous SCP girder bridge. A static load test was also carried out, using this specimen, to examine the behavior of the continuous SCP girder. Based on the results of the study, it is expected that the continuous bridge that uses the continuous SCP girder can guarantee the structural safety of the simple-support SCP girder.
Study on the Fire Resistance Performance of the TSC Beam
Kim, Sung Bae ; Choi, Seng Kwan ; Lee, Chang Nam ; Kim, Sang Sup ;
Journal of Korean Society of Steel Construction, volume 18, issue 1, 2006, Pages 113~122
The purpose of this paper is to evaluate the fire resistance of the TSC beam, a composite beam composed of a concrete beam enclosed by steel plates. Since a discrepancy was observed between the structural mechanisms of TSC and typical composite beams, the fire performances of the two beams are likewise believed to be partially dissimilar. In this experiment, small and medium-sized TSC beams were tested under given conditions in the laboratory, with/without one of the most widely used spray-on fire protections in Korea. Furthermore, based on the steel and concrete properties under elevated temperatures that were obtained from Eurocode, temperature development across the section was suggested, analyses. To determine the capacity of a modified plastic section, th e fire performance of the model was also examined.