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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 28, Issue 3 - Jun 2016
Volume 28, Issue 2 - Apr 2016
Volume 28, Issue 1 - Feb 2016
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Dynamic Characteristics Stiffened Blast-wall Structures Subjected to Blast Loading Considering High Strain-rate Effects
Kim, Gyu Dong ; Noh, Myung Hyun ; Lee, Jae Yik ; Lee, Sang Youl ;
Journal of Korean Society of Steel Construction, volume 28, issue 2, 2016, Pages 65~74
DOI : 10.7781/kjoss.2016.28.2.065
A finite element dynamic simulation is performed to gain an insight about the stiffened blast wall structures subjected to blast loading. The simulation was verified using qualitative and quantitative comparisons for different materials. Based on in-depth examination of blast simulation recordings, dynamic behaviors occurred in the blast wall against the explosion are determined. Subsequent simulation results present that the blast wall made of the high performance steel performs much better in the shock absorption. In this paper, the existing finite element shock analysis using the LS-DYNA program is further extended to study the dynamic response of the stiffened blast wall made of the high-performance steel considering high strain-rate effects. The numerical results for various parameters were verified by comparing different material models with dynamic effects occurred in the stiffened blast wall from the explosive simulation.
Structural Behavior of Welded Built-up Square CFT Column to Beam Connections with External Diaphragm
Lee, Seong Hui ; Kim, Young Ho ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 28, issue 2, 2016, Pages 75~83
DOI : 10.7781/kjoss.2016.28.2.075
Existing tubes for concrete filled tubular structure are made through welding of four plates irrespective, but the production performance is poor and special welding technique is needed to weld the internal or through diaphragm. Accordingly, We developed a welded built-up square steel tube having a welding lines and a stiffeners at location out of stress concentration. The welded built-up square steel tube occurred a interference with stiffeners at the internal or through diaphragm, therefore researches of a external diaphragm for welded built-up square CFT column connections are needed for the purpose of avoidance of a interfere with stiffeners. In this study we suggest a design formulation for external diaphragm of the welded built-up square CFT external diaphragm connections. Four specimens were manufactured for a experimental test, then we analyzed the behaviors of the specimens.
Design of a Steel Structural Building Using Double Split Tee Connections without Shear Tabs
Yang, Jae Guen ; Kim, Yong Boem ;
Journal of Korean Society of Steel Construction, volume 28, issue 2, 2016, Pages 85~96
DOI : 10.7781/kjoss.2016.28.2.085
Double split tee connection has various strength, stiffness, and energy dissipation capacity according to changes of thickness of T-stub flange and gauge distance, number, and diameter of high-strength bolt. If the double split tee connection is applied to a low- or medium-rise steel structure, a shear tab can`t be applied for supporting shear force because of geometrical limitation. So it is required to propose details of improved double split tee connection to support shear force as well as flexural force. This research was performed to see if enough rotational stiffness is found when the double split tee connection without shear tab which was obtained through analytic and experimental researches by Yang et al. is applied to a low- or medium-rise steel structure. Also, it was seen if the low- or medium-rise steel structure having double split tee connection without shear tab has safe structural behavior, as well as material saving effect.
Weathering Performance Evaluation of Duplex Coating Systems of Thermal Spraying and Painting using Corrosion Test
Kim, In Tae ; Kim, Ho Seob ; Kien, Dao Duy ; Jun, Je Hyeong ; Ahn, Jin Hee ;
Journal of Korean Society of Steel Construction, volume 28, issue 2, 2016, Pages 97~108
DOI : 10.7781/kjoss.2016.28.2.097
Thermally sprayed metals or organic coatings is often used in corrosion protection of steel structures. Duplex coating systems of thermally sprayed metal in combination with organic coating are selected as a new generic type of coatings on steel structures under the highly corrosive environments. In this study, three types of corrosion tests were carried out on four types of thermal sprayed specimens with sealing: zinc, zinc-15%aluminum alloy, aluminum and aluminum-5%magnesium alloy, four types of duplex coated specimens; thermally sprayed metals in combination with paint of acrylic urethane, and painted specimens. NORSOK M-501, Wet/dry cyclic seawater tests and outdoor exposure tests of nine types of specimens were conducted. From the corrosion test results, weathering performance of them were presented.
Flexural Behavior and Design of Concrete-filled U-shape Hybrid Composite Beams Fabricated from 570MPa High-strength Steel
Lee, Cheol Ho ; So, Hyun Joon ; Park, Chang Hee ; Lee, Chang Nam ; Lee, Seung Hwan ; Oh, Ha Nool ;
Journal of Korean Society of Steel Construction, volume 28, issue 2, 2016, Pages 109~120
DOI : 10.7781/kjoss.2016.28.2.109
Flexural tests of full-scale concrete-filled U-shape hybrid composite beams were conducted. Ordinary (SS400) and high-strength (SM570) steel plates were used in the web and in the bottom flange of U-shape steel section respectively. The primary objectives were to develop the hybrid section configuration with maximized flexural capacity and to investigate its flexural strength and deformation capacity. All the hybrid test specimens in this study exhibited the plastic moment capacity and resonable deformability. It is shown that the plastic stress distribution can be assumed in calculating the flexural strength of the proposed hybrid composite beams if the plastic neural axis is located within 15% of the total beam depth from the top of the composite slab. The procedure for computing the effective flexural stiffness of hybrid composite beams is also recommended based on test results.
An Analytical Study on the Strength Behavior of Column-Foundation Connection with High Tension Bolts
Hwang, Dong A ; Hwang, Won Sup ; Ham, Jun Su ; Jeong, Jin Il ;
Journal of Korean Society of Steel Construction, volume 28, issue 2, 2016, Pages 121~128
DOI : 10.7781/kjoss.2016.28.2.121
In order to suggest a reasonable design for the circular concrete filled tube steel column-foundation connection applying high-tension bolts, Overall structural behavior and characteristics according to various variables of column-foundation connection are numerically analyzed using a commercial FE analysis program, ABAQUS. To that goal, finite element analysis is conducted on the basis of the previous study replacing anchor bolts to high-tension bolts, and the analytical results are validated by comparison with experimental results. Also, the various variables(embedded depth and grade of anchor, and height and thickness of rib) involved in behavior of the column-foundation connection are selected through analyzing the current design criteria, and the characteristics of the column-foundation connection are compared and analyzed according to the various variables. In case of the anchor bolts, Applying the high-tension bolts is more advantage and securing the embedded depth beyond 0.5D is recommendable. In case of the rib, a minimum of 0.5D for rib`s height and
for rib`s thickness should be secured to develop the structural performance.