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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 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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Evaluation of Ultimate Strength of Shear Connection in Steel Embedded Composite Girders
Sim, Chang Su ; Kim, Hyeon Ho ; Han, Jeong Hoon ; Lee, Pil Goo ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 405~416
In composite girders with steel embedded in concrete as preflex beams, horseshoe connectors and bar connectors are commonly used to achieve composite action. Considering the requirements on the concrete cover in the thin concrete part surrounding a steel member, it has limitations with respect to the use of stud shear connectors, and significant bond and friction resistance can be generated. High horizontal shear strength between the casing concrete and the steel section is needed to introduce prestress to the concrete section in the form of preflex beams.In this paper, experiments on the evaluation of the static strength of horseshoe connectors and bar connectors were conducted and the effects of bonds were also considered. Based on the test results, current design codes were estimated and more general design guidelines that consider the design concept of Eurocode were proposed for the connectors. A strength evaluation according to failure and compared with the test results.
Analytical Study on the Development of High-Performance Orthotropic Steel Deck considered the Fatigue Behaviors of Structural Details
Kyung, Kab Soo ; Shin, Dong Ho ; Kim, Kyo Hun ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 417~426
Various fatigue damages have been reported in orthotropic steel deck structures put upon girders. These damages are caused by complex behaviors of the deck, which is directly subjected to vehicle loads. To estimate the causes of fatigue cracks at the welded connected parts of the trough rib and the flor beam, and the trough rib and the deck plate, in orthotropic steel deck structures, FE analyses were first, performed in this study. Parameter studies were carried out to suggest effective structural details that consider fatigue, in which the main parameters are the thickness of the deck plate, the shape of the connection of the trough rib and the flor beam such as the slit form, and the welding length. This study suggests that the effective structural details improved the fatigue strength and discusses.
Approximate Solution for In-Plane Elastic Buckling of Shallow Parabolic Arches
Moon, Ji Ho ; Yoon, Ki Yong ; Yi, Jong Won ; Lee, Hak Eun ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 427~436
The classical buckling theory assumes that prebuckling behavior is linear and that the effect of prebuckling deformations on buckling can be ignored. However, when the rise to span ratio decreases, prebuckling deformation cannot be ignored and the symetrical buckling strength can be smaler than the asymetrical buckling strength. Finally, arches can fail due to snap-through buckling. This paper investigates the non-linear behavior and strength of pin-ended parabolic shallow arches using the non-linear governing differential equation of shallow arches. These results were compared with the solution for the symmetrical buckling load of pin-ended parabolic shallow arches was suggested.
Variation of Natural Frequency and Dynamic Behavior of Railway Open-Steel-Plate-Girder Bridge with Installing Disk Bearings
Choi, Eun Soo ; Lee, Hee Up ; Kim, Sung Il ; Kim, Lee Hyeon ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 437~446
Open-steel-plate-girder(OSPG) bridges are one of the most prevalent bridge types among Korean railway bridges. They account for about 40% of all Korean railway bridges. However, the line-type bearings used for OSPG bridges generate several problems with respect to the bridges' dynamic behavior and maintenance. The replacement of the existing bearings with polyurethane disk bearings could be a possible solution to this problem. This type of disk bearing is an elastic bearing using a polyurethane disk. This study estimated the variations in the natural frequency of a bridge when disk bearings were installed and the bridge's dynamic behavior with a running locomotive and running trains. The first natural frequency of the bridge was 3% lower than that of the as-built bridge after the installation of the disk lower, respectively. Also, the second and third frequencies were 7 and 15% lower, respectively. The disk bearings increased the vertical displacement of the bridge, but the pure displacement, excluding the disk deformation, did not vary. The vertical acceleration did not increase when the disk bearing was installed, with trains running. The shear pin in the disk bearing reduced the lateral displacement and the acceleration of the bridge.
Experimental Study on the Top- Lateral Bracing of U-Type Steel Box Girders Using Real Size Specimen: Torsional Stiffness
Shim, Nak Hoon ; Park, Young Suk ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 447~456
In this study, a torsional test for U-type steel box girders was performed to observe the effects of the kind of panel for top lateral walateral bracings on the torsional behavior of the U-type steel girder system. For the structural tests, the test specimen with a two-thirds scale of the system actually constructed in the field was used. In the torsional test to observe the efects of top lateral bracings, the most economical arrangement of the top lateral bracing was found to be the panel width to length ratio of 1:1.5 with the inclined angle of
Ductility Capacity of Shear-Dominated Steel Plate Walls
Park, Hong Gun ; Choi, In Rak ; Jeon , Sang Woo ; Kim, Won Ki ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 457~468
An experimental study was performed to investigate the maximum energy dissipation and the ductility capacity of shear-dominated steel plate walls with thin web plates. Three specimens of three-story plate walls with thin web plates were tested. The parameters for the test specimens were the aspect ratio of the web plate and the shear strength of the column. A concentrically braced frame and a moment-resisting frme were a also tested for comparison. The steel plate walls exhibited much better ductility and energy dissipation capacity than the concentrically braced frame and the moment-resisting frame. The results showed that unlike other structural systems, the sh as well as strength, and can therefore be used as an effective earthquake-resisting system. A method of predicting the energy dissipation capacity of a steel plate wall was proposed.
Static and Dynamic Behavior of Disk Bearings under Railway Vehicle Loading
Oh, Saeh Wan ; Choi, Eun Soo ; Jung, Hie Young ; Kim, Hak Soo ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 469~480
The goal of this study is to ases the static and dynamic behavior of disk bearings under railway vehicle loadings. Several static tests were conducted in a laboratory t bearings, all having the same kind of polyurethane disk as used in the static tests, were installed under a full-sized railway bridge and tested with a running locomotive, the tests results, the static and dynamic stiffness of the disk bearings were estimated and compared. the deformation of the disk bearings under the bridge was measured at varying disk bearing was almost half of that under dynamic loading. In addition, the dynamic stiffness of the fixed disk bearing was 80% higher than that of an expansion disk bearing, since the PTFE in the expansion bearing is displaced. The deformation of the disk bearing did not vary significantly with changes in locomotive's speed. The results of this study can contribute to fast-tracking the formulation of a design technique for disk bearings for railway bridges.
Determination Process of Drift Capacity for Seismic Performance Evaluation of Steel Tall Buildings
Min, Ji Youn ; Oh, Myoung Ho ; Kim, Myeong Han ; Kim, Sang Dae ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 481~490
The actual performance of a building during an earthquake depends on many factors. The prediction of the seismic performance of a new or existing structure is complex, due not only to the large number of factors that need to be considered and the complexity of the seismic response, but also due to the large inherent uncertainties and randomness associated with making these predictions. A central issue of this research is the proper treatment and incorporation of these uncertainties and randomness in the evaluation of structural capacity and response has been adopted in the seismic performance evaluation of steel tall buildings to account for the uncertainties and randomness in seismic demand and capacities in a consistent manner. The basic framework for reliability-based seismic performance evaluation and the key factors for statistical studies were summarized. A total of 36 target structures that represent typical tall steel buildings based on national building code (KBC-2005) were designed for the statistical studies of demand factor s and capacity factors. The incremental dynamic analysis (IDA) approach was examined through the simple steel moment frame building in determination of global drift capacity.
Punching Shear Strength and Behavior of CFT Column to RC Flat Plate connections
Lee, Cheol Ho ; Kim, Jin Won ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 491~502
This paper summarizes full-scale test results on CFT column-to- flat plate connections has gained wide acceptance subjected to gravity loading. CFT construction has gained wide acceptance in a relatively short time in domestic building construction practice due to its various structural and construction advantages. However, efficient details for CFT column to flat plate connections have not been proposed yet. Based on the strategies that maximize economical field construction, several connecting schemes were proposed and tested. Test results showed strength and connection stiffness exceeding those of R/C flat p late counterparts. A semi-analytical procedure is presented to model the behavior of CFT column-to-flat plate connections. The five parameters to model elastic to post-punching catenary action range are calibrated based on the limited test data of t to progressive collapse prevention design is also illustrated.
Estimation of Dynamic Displacement and Characteristics of A Simple Beam from FBG Sensor Signals
Choi, Eun Soo ; Kang, Dong Hoon ; Chung, Won Seok ; Kim, Hak Soo ;
Journal of Korean Society of Steel Construction, volume 18, issue 4, 2006, Pages 503~514
FBG sensors are capable of measuring the strain of structures easily and more durably than electric resistance gauges. Thus, many researches are dedicated to the application for the response monitoring or non-destructive evaluation of structures using FBG sensors. Additionally, the measured strains at the top and bottom of a cross-section can be transformed into the curvature of the section, which can be used to calculate its vertical displacement. Hence, this study aims to measure the dynamic strain signals of a steel section simply supported beam and to estimate the dynamic displacement from the strain signals, after which the estimated displacement is com pared with the measured displacement. The dynamic characteristics (natural frequency, damping ratio and mode shape) of the beam are predicted from both the estimated and measured displacement signals, and from the strain time history of the FBG sensors. The predicted properties are compared with those of an analytical model of the beam. The estimated displacement. However, the predicted dynamic properties from both the estimated displacements and the measured strains are well-correlated with those from the measured displacement. It is therefore appreciated that the estimation of the dynamic properties of FBG sensor signals is reasonable. Especially, the strain signal of the FBG sensor was amplified at a higher-frequency region in comparison with the displacement estimation with higher-mode properties.