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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 20, Issue 6 - Dec 2008
Volume 20, Issue 5 - Oct 2008
Volume 20, Issue 4 - Aug 2008
Volume 20, Issue 3 - Jun 2008
Volume 20, Issue 2 - Apr 2008
Volume 20, Issue 1 - Feb 2008
Selecting the target year
The Effect of Blast Cleaning for Steel Bridge Painting on Fatigue Behavior of Out-of-Plane Gusset Welded Joints
Kim, In Tae ; Le, Van Phuoc Nhan ; Kim, Kwang Jin ; Lee, Dong Uk ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 583~590
Blasting has been applied in newly-built steel structures for cleaning forged surfaces and increasing the adhesive property of applied painting systems. However, the effect of the blast cleaning on fatigue behavior of welded joints is not clear. In this paper, fatigue tests were carried out on out-of-plane gusset welded joints and the effect of the blast cleaning on the fatigue behavior was studied. The curvature radius at the weld toe of the surface-treated specimens by using the blast method is larger than that of as-welded specimens. By the blast cleaning compressive residual stresses were induced into weld toes. The experimental results showed that the fatigue life of surface-treated specimens is longer than that of as-welded specimens, even though the fatigue life of surface-treated specimens and that of as-welded specimens are not clearly different in the high stress range. About a 160% increase in fatigue limit could be realized by using blast cleaning.
Proposed Prediction of Corrosion Loss for Weathering Steel Cladding in KIHO region using Multi-variable Analysis
Chung, Kyung Soo ; Lee, Jae Sung ; Chung, Jin An ; Lee, Sung Eun ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 591~599
Weathering steel has been widely used in bridges and cladding materials due to its superior atmospheric corrosion resistance. Actually, weathering steel has often been used in Korea as cladding material. However, the performance of the weathering steel in claddings has not been fully monitored. We conducted a field study on the performance of weathering steels and measured the quantity of corrosion loss on the weathering steel claddings in Korea. Based on the measured corrosion loss and weather (environmental) data, the equation to predict corrosion loss of weathering steels was proposed by using environmental factors in KIHO region in Korea. The proposed equation predicted very well the real corrosion losses of KIHO region.
Performance Evaluation of Welded Joints for Single-Layer Latticed Domes through Joint Rigidity Test
Lee, Young Hak ; Seo, Sang Hoon ; Kim, Min Sook ; Kim, Hee Cheul ; Lee, Sung Min ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 601~608
Joints of single-layer latticed domes show various flexural behaviors according to their shapes and connecting methods. Ball joints are relatively easy to apply and build while their rigidities are relatively small and have disadvantage in long span. Welded joints have many advantages in rigidity, internal force and long span. However few experimental studies have been performed. In this paper, improved welded joint for the single layer latticed domes was proposed through both analytical and experimental analyses. Length of inserted plates, thickness of inserted plates and hole of sub steel pipes were selected as parameters for experimental comparisons and defining the effects of the selected variables.
A Study on Tension for Cables of a Cable-stayed Bridge Damper is Attached
Park, Yeon Soo ; Choi, Sun Min ; Yang, Won Yeol ; Hong, Hye Jin ; Kim, Woon Hyung ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 609~616
Recently, many ocean bridges that connect land to island or island to island have been constructed along with the improvement of the nation's economy. Long-span bridges can be categorized as suspension bridge, cable-stayed bridge, arch bridge and truss bridge. In this study, correction with respect to construction error can be presented on site through the monitoring of the cable tension change of real structure for four major construction stages so that construction accuracy, including the management of profiles, can be improved. A vibration method, the so-called indirect method that uses the cable's natural frequency changes from the acceleration sensor installed on the cable, is applied in measuring cable tension. In this study, the estimation formula for the effective length of cable with damper is presented by comparing and analyzing between actual measurement and analysis result for the change of the cable's effective length. By the way, it is known that the reliability of estimating cable tension by applying the former method that uses the net distance from damper to anchorage is low. Therefore, for future reference of the maintenance stage, the presented formula for estimating the effective length of cable can be used as a reference for the rational decision-making, such as the re-tensioning and replacement of cable.
Evaluation of Rotation Capacity of Steel Moment Connections ConsideringInelastic Local Buckling - Model Development
Lee, Kyung Koo ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 617~624
Well-designed steel moment connections will undergo local buckling before they exhaust their available rotation capacity, and inelastic post-buckling deformation plays a major role in defining the connection rotation capacity. An approximate analytical method to model strength degradation and failure of beam plastic hinges due to local buckling and estimation of the seismic rotation capacity of fully restrained beam-column connections in special steel moment-resisting frames under both monotonic and cyclic loading conditions is proposed in this study. This method is based on the plastic mechanism and a yield line plastic hinge (YLPH) model whose geometry is determined using the shapes of the buckled plastic hinges observed in experiments. The proposed YLPH model was developed for the improved WUF-W and RBS connections and validated in comparison with experimental data. The effects of the beam section geometric parameters on the rotation capacity were discussed in the companion paper (parametric studies).
Evaluation of Rotation Capacity of Steel Moment Connections ConsideringInelastic Local Buckling - Parametric Studies
Lee, Kyung Koo ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 625~632
In the companion paper (Model Development), an analytical model estimating the available rotation capacity of fully restrained beam-column connections in special steel moment-resisting frames was proposed. In this paper, two limit states were considered as the connection rotation capacity criteria: (i) strength degradation failure when the strength falls below the nominal plastic strength due to the local buckling of the beam's cross-section and (ii) low-cycle fatigue fracture caused by plastic strain accumulation at the buckled flange after only a few cycles of high-amplitude deformation. A series of analyses are conducted using the proposed model with two limit states under monotonic and cyclic loadings. Beam section geometric parameters, such as flange and web slenderness ratios, varied over the practical ranges of H-shapedbeams to observe their effect on the rotation capacity and low-cycle fatigue life of pre-qualified WUF-W connections.
A Experimental Study on the Structural Performance of Column Spliceswith Metal Touch Subjected to Axial Force and Bending Moment
Hong, Kap Pyo ; Kim, Seok Koo ; Lee, Joong Won ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 633~644
The structural framework design uses high-strength bolts and welding in column splices. However, for the column under high compression, the number of the required high-strength bolts can be excessive and the increase of welding results in difficulty of quality inspection, the transformation of the structural steels, and the increase of erection time. According to the AISC criteria, when columns have bearing plates, or they are finished to bear at splices, there shall be sufficient connections to hold all parts securely in place. The Korean standard sets the maximum 25% of the load as criteria. Using direct contact makes it possible to transfer all compressive force through it. The objective of this study is to examine the generally applied stress path mechanism of welded or bolted columns and to verify the bending moment and compression transfer mechanism of the column splice according to metal touch precision. For this study,22 specimens of various geometric shapes were constructed according to the change in the variables for each column splice type, which includes the splice method, gap width, gap axis, presence or absence of splice material, and connector type. The results show that the application of each splice can be improved through the examination of the stress path mechanism upon metal contact. Moreover, the revision of the relative local code on direct contact needs to be reviewed properly for the economics and efficiency of the splices.
An Experimental Study on Structural Performance of Welded Built-up Square CFT Stub Columns
Lee, Seong Hui ; Choi, Young Hwan ; Yom, Kyong Soo ; Kim, Jin Ho ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 645~653
Welded built-up square tubes are manufactured by flare welding at the center of the column width for cold-formed L-shaped four-piece plates and improved composite effect of concrete and steel by vertical inner anchor. Also, the axial resistance of concrete is increased by the thinness of the steel column, and the composite effect of concrete and steel prevents the steel column from local buckling. In this study, we introduced a manufacturing method of built-up square column steel square concrete-filled tubular column with vertical inner anchor and superior structural performance of the square stub column verified by the structural test for 15 specimens with parameters of shape of tube (built-up square tube, general steel tube), width over thickness of the steel tube (B/t=50, 58, 67) and the strength of concrete (f'c=10MPa, 50MPa).
Fire Resistance of Concrete-Filled Circular Steel Tube Columns under Central Axial Loads
Park, Su Hee ; Song, Kyung Chul ; Ryoo, Jae Yong ; Chung, Kyung Soo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 655~663
In this research, the fire resistance of Concrete-Filled Circular Steel Tube Columns (CFT) was evaluated by numerical analysis. As the materials of CFT columns, the steel of SPSR 400 grade and the concrete of 27.5MPa, 37.8MPa strengths were used. Significant parameters,such as concrete strength, axial load, and cross-sectional dimensions were determined. To verify the accuracy of the numerical analysis,the analysis results were compared with the former experiment results. The effect of the fire resistance time, axial load ratio, cross-sectional dimensions and concrete strength was evaluated by comparison with the fire resistance of the square CFT columns. This research showed that the structural behavior and fire resistance from the findings of numerical parametric studies showed a similarity to that of the experimental results. Therefore, this numerical analysis is reasonable in estimating the fire resistance of the circular CFT column.
Structure Behavior Evaluation of Beams composited with Steel and Reinforced Concrete
Kim, In Seok ; Kim, Hak Soo ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 665~673
The composite structures of steel and reinforced concrete, which have been widely used in large-scale concrete structures, werestudied to investigate the cause of unexpected cracks and to verify the composite actions between the two materials. Vertical stiffeners between flanges, studs and dowel bars, stirrups, and concrete strength were chosen as experimental variables in afour-point loading test. The results showed that the vertical stiffener prevented not only the local web buckling, but also bond failures between steel and concrete. It increased the flexural resistance (fracture loads) due to the composite action of two materials, compared withthose of any experimental variable. However, the composite behavior of steel reinforced concrete beam was not affected seriously by additional studs, dowel bars, stirrups, and concrete strength.
A new steel jacketing method for RC columns and a modified constitutive model of jacketed concrete
Tae, Ghi Ho ; Choi, Eun Soo ;
Journal of Korean Society of Steel Construction, volume 20, issue 5, 2008, Pages 675~681
This study introduced a new steel-jacketing method to retrofit RC columns. It also estimated the performance of steel-jacketed concrete cylinders. Twelve concrete cylinders were fabricated with varying steel jacket thicknesses of 1.0, 1.5, and 2.0 mm. Lateral confining pressure was applied with three clamps and the performance of plain concrete cylinders was compared with that of steel-jacketed cylinders. Steel jacket proved to be effective in increasing the strength of the cylinder. Finally, Li's constitutive model was compared with that of the experimentalresults. However, Li's model showed incongruity in Region II, which indicates the region after the yield of steel jackets. Therefore, the modified value of n was used for the region and the model showed a good agreement.