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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 26, Issue 6 - Dec 2014
Volume 26, Issue 5 - Oct 2014
Volume 26, Issue 4 - Aug 2014
Volume 26, Issue 3 - Jun 2014
Volume 26, Issue 2 - Apr 2014
Volume 26, Issue 1 - Feb 2014
Selecting the target year
Analysis of Natural Frequency According to Span of Foot-bridges
Do, Ki Young ; Yoon, Sung Won ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 375~383
DOI : 10.7781/kjoss.2014.26.5.375
In Seoul, total 166 places of foot-bridges were constructed but a study on correlation between resonance occurrence status by gait vibration and natural frequency by each span and that between span based on structural system and natural frequency is very unsatisfactory in reality. Consequently in this study, time series wave form, power spectrum and natural frequency were analyzed based on resonance occurrence by targeting 65 places of foot-bridges being constructed in Seoul through convenient and simple portable vibration meter.
Effects of Composite Floor Slab on Seismic Performance of Welded Steel Moment Connections
Lee, Cheol Ho ; Jung, Jong Hyun ; Kim, Jeong Jae ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 385~396
DOI : 10.7781/kjoss.2014.26.5.385
Traditionally, domestic steel design and construction practice has provided extra shear studs to moment frame beams even when they are designed as non-composite beams. In the 1994 Northridge earthquake, connection damage initiated from the beam bottom flange side was prevalent. The upward moving of the neutral axis due to the composite action between steel beam and floor deck was speculated to be one of the critical causes. In this study, full-scale seismic testing was conducted to investigate the side effects of the composite action in steel seismic moment frames. The specimen PN700-C, designed following the domestic connection and floor deck details, exhibited significant upward shift of the neutral axis under sagging (or positive) moment, thus producing high strain demand on the bottom flange, and showed a poor seismic performance because of brittle fracture of the beam bottom flange at 3% story drift. The specimen DB700-C, designed by using RBS connection and with the details of minimized floor composite action, exhibited superior seismic performance, without experiencing any fracture or concrete crushing, almost identical to the bare steel counterpart (specimen DB700-NC). The results of this study clearly indicate that the beams and connections in seismic steel moment frames should be constructed to minimize the composite action of a floor deck if possible.
Flexural Analysis of Laminated Composite T-Beams
Back, Sung Yong ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 397~405
DOI : 10.7781/kjoss.2014.26.5.397
A shear-flexible beam element is presented for the flexural analysis of laminated composite T-beams with arbitrary lay-ups. Based on the first-order shear deformable beam theory, the derived element takes into account warping shear deformation and all coupling coming from material anisotropy. Three different types of beam elements, namely, the two-noded, three-noded, and four-noded beam elements with seven degree-of-freedom per node are developed to solve governing equations. To demonstrate the versatility and accuracy of the beam element formulated, numerical results are performed for symmetric and anti-symmetric angle-ply composite T-beams under the uniformly distributed and concentrated load. The effects of fiber angle and shear deformation are investigated for different laminated stacking sequence. The quadratic and cubic elements are shown to be applicable to the flexural analysis of composite T-beams.
Flexural Tensile Strength of CJP Groove Welded Joints Connecting Thick HSA800 Plates
Lee, Cheol Ho ; Kim, Dae Kyung ; Han, Kyu Hong ; Park, Chang Hee ; Kim, Jin Ho ; Lee, Seung Eun ; Kim, Do Hwan ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 407~418
DOI : 10.7781/kjoss.2014.26.5.407
As a continuing work of previously conducted standard tension tests, full-scale flexural tests were conducted in this study to assess the structural performance the CJP groove welded joints connecting thick HSA800 plates. Two welding electrodes were available at the time of this experimental research; one was GMAW-based electrode A and the other FCAW-based electrode B. Three full-scale box-type beam specimens with single bevel- and V-groove CJP welded joints were fabricated from 60mm and 25mm thick HSA800 plates according to the AWS-prequalified groove welded joint details. In designing the specimens, all possible limit states like local and lateral torsional buckling were carefully controlled in order to induce flexural plastic yielding or eventual joint fracture. All the CJP joints made by both welding electrodes showed satisfactory performance and were able to transfer the tensile flange forces higher than that corresponding to the measured tensile strength of HSA800 flange plates. However, it should be noted that, during fabrication, serious concerns about the welding efficiency and workability of the GMAW-based electrode were raised by a certified welder. The fracture occurred at the unbeveled (or vertical) interface between the weldment and the base metal when the GMAW-based electrode was used in the single-bevel joint, implying the possibility of insufficient melting. Thus, the FCAW-based electrode B is again recommended as the choice of welding electrode for HSA800 plates. The limited test data of this study implies that the V-groove CJP joint should be used in favor of the single bevel CJP joint, if possible.
Relief Hole for Improvement of Fatigue Strength in Welded Intersections of Transverse and Longitudinal Ribs in Orthotropic Deck
Jung, Kyoung Sup ; Nam, Seung Hoon ; Yang, Keon Bong ; Kim, Kyoung Nam ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 419~430
DOI : 10.7781/kjoss.2014.26.5.419
On going researches which are being made on the welded joints at the intersections of closed ribs such as U-ribs with floor-beams in ortho-tropic steel decks still have been used the shape of scallops with or with not diaphragm inside. Stress Relief Hole(SRH) being presented in this study was investigated in order to reduce the fatigue damage in the intersections of U-rib with floor-beam. Finally, it is verified that circular SRHs sufficiently relief the concentration stress at the intersections of U-rib with floor-beam and shows that SRH can be offer one of the methods that can prevent the fatigue damage in these structural details.
Seismic Performance of Built-up Concrete Filled Square Composite Column-to beam Connection with Through Diaphragm
Kim, Sun Hee ; Yom, Kyong Soo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 431~439
DOI : 10.7781/kjoss.2014.26.5.431
Concrete filled tubular columns are widely used because the mutual reaction between the concrete and the tube improves strength and ductility of the columns. In an attempt to secure efficient use of members, built-up square columns featuring large width-thickness ratio and the use of thin steel plates are suggested in this study. In order to evaluate the structural characteristics and seismic performance of the column-to-beam connections of the new shape columns, cyclic load test of T-shaped column-to-beam connections was conducted with variables of diaphragms and concrete-filling. Moment-rotational angle relationship, dissipated energy and failure behavior were compared to evaluate stress transfer mechanism of the new shape built-up square column-to-beam connections associated with the variables.
Test of SRC Column-to-Composite Beam Connection under Gravity Loading
Kim, Young Ju ; Bae, Jae Hoon ; Ahn, Tae Sang ; Jang, Seong Hoon ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 441~452
DOI : 10.7781/kjoss.2014.26.5.441
In this paper, steel reinforced concrete(SRC) column and composite beam connections were statically tested under gravity loading. The composite beam consists of H-section and U-section members. Five full-scaled specimens were designed to investigate the effect of a number of parameters on behavior of connections such as H-section size, the presence of stud connector, the presence of stiffeners and top bars. In addition, structural performance of welded joint between the H-section and the U-section members is mainly discussed, with an emphasis on initial stiffness, strength, deformation capacity.
Analytical Study on the Structural Behaviors of Stub Columns Fabricated with HSA800 of High Performance Steel Subjected to Eccentric Loads
Yoo, Jung Han ; Kim, Joo Woo ; Yang, Jae Guen ; Kang, Joo Won ; Lee, Dong Woo ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 453~461
DOI : 10.7781/kjoss.2014.26.5.453
In this study, the stub columns of built-up H-section and square hollow section subjected to eccentrical loads are tested to evaluate the applicability of the structural members with 800MPa high-strength steel (HSA800) on current design specification. Analytical studies of FE model are conducted to validate the test results and then the verified FE models are used for extensive parametric studies for checking up the applicability of current design code. The parameters are width-to-thickness ratios and axial load ratios. From P-M correlations on parameter models, all stub columns with non-compact sections exceed the current design requirements about axial force and flexural strength ratios are sufficiently secured as the axial load ratios are decreased. The built-up hollow sections with slender section model do not satisfy the current design specification about axial force.
Evaluation of Applicability on a High-rise Building for the Effective Usage of High Performance Steel for Building Structures
Kim, Do Hwan ; Kim, Joo Woo ; Lee, Dong Woo ; Yang, Jae Guen ; Lee, Myung Jae ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 463~471
DOI : 10.7781/kjoss.2014.26.5.463
As building height and span is getting taller and longer, the researches to increase material's strength and serviceability are continuously performed. This study evaluated mechanical and chemical properties of newly developed high-strength steel (HSS) for building structures, namely HSA800 and verified cost-effectiveness and applicability of HSS for a tall building by comparing the analysis results of normal strength steel (SM490) model. HSA800 was manufactured by TMCP to have a good weldability in spite of HSS and satisfied Korean Industrial Standards (KS). The analysis results for evaluating cost-effectiveness show that total steel quantity could be saved approximately 30% when using HSS compared to SM490. It is expected that HSA800 will contribute to enhance constructability of building.
The Evaluation of the Axial Strength of Composite Column with HSA800 Grade Steel
Lee, Myung Jae ; Kim, Cheol Hwan ; Kim, Hee Dong ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 473~483
DOI : 10.7781/kjoss.2014.26.5.473
According to the Korean Building Code (KBC), the validity of the application of 800MPa grade steel(HSA800) to composite column should be verified by experimental or analytical method. Thus, stub column tests for encased and filled composite members with HSA800 steel were conducted, and axial strength and the validity of design compressive strength equations in KBC were evaluated. The test results show that the equation of the compressive strength of encased composite column member in KBC should be modified in order to use HSA800 steel without any reduction of specified minimum yield strength. For this purpose, it is suggested that the interval of hoop should be narrowed and the effective concrete area should be used. The equation of the compressive strength of filled composite column member in KBC is applicable to filled composite column with HSA800 steel without any modification.
Evaluation of Impact Factor in Suspension Bridges under A Series of Moving Vehicles
Park, Yong Myung ; Kim, Dong Hyun ; Kim, Hee Soon ; Park, Jae Bong ;
Journal of Korean Society of Steel Construction, volume 26, issue 5, 2014, Pages 485~498
DOI : 10.7781/kjoss.2014.26.5.485
In this paper, vehicle-bridge interaction analysis under a series of moving vehicles to simulate a lane load was performed to estimate impact factor of the main cable, hanger and girder for the selected suspension bridges with 404m and 1545m main span. Korea Bridge Design Code(Limit State Design) was selected for the live model in which KL-510 truck was modeled 6-d.o.f. vehicle and a lane load was simulated by a series of single-axle vehicles. For the 404m main span bridge, hinge-type and floating-type girders at the tower were considered to examine the impact factor according to the connection and supporting type of the girders. The parameters considered herein are the types of live load-a truck only and a truck plus lane load, eccentricity of moving vehicles, road surface roughness and vehicle speed. The road surface roughness was randomly generated based on ISO 8608 and it was applied to the truck only. The impact factors were also evaluated by using the influence line method that is commonly used in cable-supported bridges and compared with those from vehicle-bridge interaction analysis.