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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 12, Issue 5 - Oct 2000
Volume 12, Issue 4 - Aug 2000
Volume 12, Issue 3 - Jun 2000
Volume 12, Issue 2 - Apr 2000
Volume 12, Issue 1 - Feb 2000
Volume 12, Issue 6 - 00 2000
Selecting the target year
Fatigue Characteristics according to the Shape of Cover Plate in Steel Plate Girders
Jung, Young Hwa ; Hong, Sung Wook ; Kim, Ik Gyeom ; Jung, Jin Suck ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 111~122
In this study, A series of fatigue tests have been performed on the fillet welded joints of cover plates in steel plate girders in order to quantitatively assess the fatigue characteristics according to the shapes of cover plates. From the results of fatigue tests, it has been shown that the fatigue strengths were slightly different according to their shapes, but satisfied the fatigue design curves in Korea and other countries. Also, from the results of beachmark tests, it has been confirmed that the points of fatigue crack initiation were closely related to the shapes of weld bead toes, and fatigue cracks simultaneously initiated from several points in weld bead toes have been grown as semi-elliptical surface cracks, and these cracks have been coalesced each other, and grown as through thickness cracks, and finally reached to fracture. Besides, from the results of fracture mechanics approaches, stress gradient factors were the most dominant factors among crack correction factors obtained from the existing equations and finite element analysis, and the fatigue life on fillet welded joints of cover plates could be estimated using the relations between fatigue crack growth rate and stress intensity factor range obtained from finite element analysis.
Behavior of Steel Box Girder Bridge According to the Placing Sequences of Concrete Slab (I)
Kwak, Hyo Gyoung ; Seo, Young Jae ; Jung, Chan Mook ; Park, Young Ha ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 123~131
In this study, both experimental and analytical study for behavior of the existing composite steel box girder bridges, constructed along with the procedure of continuous placing slab, are conducted to establish the validity of the proposed model. The layer approach is adopted to determine the equilibrium condition in a section to consider the different material properties and concrete cracking across the sectional depth, and the beam element stiffness is constructed on the basis of the assumed displacement field formulation and the 3-points Gaussian Integration. In addition, the effects of creep and shrinkage of concrete for time-dependent behavior of the bridge are taken into consideration. Finally, both analytical and experimental results are compared.
Behavior of Steel Box Girder Bridge According to the Placing Sequences of Concrete Slab (II)
Kwak, Hyo Gyoung ; Seo, Young Jae ; Jung, Chan Mook ; Park, Young Ha ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 133~142
This study deals with behavior of steel box girder bridges according to the concrete slab casting sequences and sectional types. The time dependent behavior of bridges caused by the differential setting of slab concrete resulting from time gap for each part of slab deck in a sequential placing method produces is analyzed. In correlation studies between girder section types and placing sequences, time dependent effects of concrete creep and shrinkage are implemented in the analytical model proposed in the previous study. Finally, field recommendations in terms of concrete slump and relative humidity are suggested to prevent early transverse cracking of concrete slabs.
Study on the Profile of Nut Bearing Surface and the Torque Coefficient of a High Strength Bolt Set
Lee, Baek Joon ; Sohn, Seung Yo ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 143~150
Depending upon the combination of tolerances specified in the standards on bolt, nut and washer for high tension bolt sets, there arises center-to-center deviation between bolt and washer. This deviation nay cause loss of effective contact area between nut- and washer-faces, which leads to some dispersion of the torque coefficient K. By adapting circular arc surface instead of flat surface for the nut, it is shown through numerical analyses that the dispersion of the torque coefficient can be minimized. In this way, optimum radius of curvature of the nut bearing surface is proposed.
A Study on the Simultaneous Loading Factors for the Fatigue Design of Bridges
Lee, Dong Uk ; Seo, Won Chan ; Choi, Jae Won ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 151~165
Since vehicles become large and heavy and traffic volume is increased rapidly, many fatigue damages have been reported in bridge members. In order to prevent fatigue damages of bridge members and maintain safety it is essential to perform rational fatigue check. Only one vehicle is loaded on a bridge deck for the fatigue design. But in reality it is seldom that only one vehicle passes on a bridge deck. Usually more than two vehicles are passing on a bridge deck simultaneously. Therefore, it is necessary to consider the influence of simultaneous loading for a rational fatigue design. In this study, the influence of simultaneous loading is investigated by performing stress variation analysis due to vehicle load on the basis of linear superposition method and Monte-Carlo simulation of traffic flow, and then calculating the measure of fatigue damages.
Experiments on Slip Coefficients of High-Strength Bolt Connection with Weathering Steel (I)
Park, Yong Myung ; Seong, Taek Ryong ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 167~175
An experimental research to evaluate the slip coefficient of high-strength slip-critical-type bolt connection of weathering steel plate has been performed in this paper. Experiments were performed with several surface conditions such as clean mill scale with hand or power brush cleaning, shot blast cleaned, inorganic zinc primer coated, and weather coated surfaces. Also, the relaxation of bolt clamping force was estimated during 500 hours. It was ascertained from the experiments that slip coefficients are greater than 0.40 in all faying surface conditions except mill scale surface with power brushing. The quantify of relaxation depended on the surface conditions and was
, i.e., less than 10%.
Experiments on Slip Coefficients of High-Strength Bolt Connection with Weathering Steel (II)
Park, Yong Myung ; Seong, Taek Ryong ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 177~185
An experimental research to evaluate the slip coefficients of high-strength friction-type bolt connection of weathering steel plate has been performed in this paper. The test specimens with mill scale or shot blast had been exposed in open air during 3 and 6 months and cleaning of rust surface by hand brushing, power tool brushing and no cleaning was considered. The relaxation of bolt clamping force had also been measured during 600 hours. It was found that slip coefficients increased to the value over 0.6 with exposure except mill scale surface by power tool brushing. The relaxation of bolt tension force in exposed specimens also increased and maximum value reached to about 10%.
A Study on the Stability of Anisotropic Cylindrical Shells
Park, Keun Woo ; Yhim, Sung Soon ; Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 187~196
In this paper, stability analysis is carried out for the out of plane behaviors under compressive loads to the direction of the generator in anisotropic cylindrical shells. It is not easy to obtain the analytic solutions about the stability analysis of anisotropic cylindrical shells consisted of composite materials. For solving this problems, this paper used the finite difference method which is one of the numerical methods. Geometrical property of cylindrical shells transforms the compressive loads into the inplane behaviors. This paper studied the change of stiffness in the direction of the circumferential and stability of shells according to change of fiber angle, curvature, subtended angle and aspect ratio. From result of this study, anisotropic cylindrical shells under compressive loads to the direction of the generator vary greatly with respect to the change of the circumferential stiffness. Therefore, it will be more safe to strengthen the circumferential stiffness of anisotropic cylindrical shells under compressive loads.
Residual Stress Distribution on the Fillet Weldment used by Finite Element Method
Kim, Hyun Sung ; Woo, Sang Ik ; Jung, Kyoung Sup ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 197~207
A transient heat transfer analysis and thermo-elastic analysis have been performed for the residual stress distribution on the fillet weldment used by finite element method. Specimen is fabricated single-pass fillet welding. This computation was performed for conditions including surface heat flux and temperature dependent thermo-physical properties using by heat input as parameter. Also, cut-off temperature of residual stress estimation by thermo-elastic analysis is determined. The fillet weldment were measured to determined their residual stress distributions for using hole-drilling method. As result, it was found that large tensile residual stress is about material yield strength, and the numerical simulation results for finite element method similar to residual stresses by hole-drilling method and other exiting research. Also, cut-off temperature is effectively determined by temperature which calculated maximum thermal stress equal to material yield strength.
Evaluation on Deformation Capacity of CFT Square Columns subject to Constant Axial and Cyclic Lateral Loads
Ji, Ku Hyun ; Choi, Sung Mo ; Kim, Dong Kyu ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 209~219
Concrete Filled steel Tube(CFT) Column has an excellent structural capacities in accordance with an interaction effect between the steel tube and concrete. Recently, CFT structure has been focussed on a structural system for a high-rise buildings. The purpose of this study is to evaluate a strength and deformation capacity of CFT square columns subjected to constant axial and cyclic lateral load. The test parameters are diameters to thickness ratio of steel tube, axial load ratios, concrete strengths, load applying types and whether or not filled concrete. Total sixteen specimens are fabricated to clarify the energy absorbtion capacity of CFT columns. Experimental results are summarized for maximum strength, initial stiffness and deformation capacity.
Finite Difference Stability Analysis of Anisotropic Plates with Free Edge
Yoo, Yong Min ; Lee, Sang Youl ; Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 12, issue 2, 2000, Pages 221~230
Checking the stability of anisotropic plates with free edges, it is impossible that buckling loads and modes are found via existing classical methods about various loads and boundary conditions. For solving this problems. finite difference method(FDM) is used to analyze the buckling behaviors for arbitrary boundary conditions. Using FDM, it is difficult to treat the fictitious points on free edges. So, this paper analyzes buckling behaviors of analytic models with one edge free and the other edges clamped and with opposite two edges free and other two edges clamped. The various buckling loads and mode characteristics through numerical results are given for buckling behaviors of anisotropic plates on free edges.