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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 16, Issue 6 - Dec 2004
Volume 16, Issue 5 - Oct 2004
Volume 16, Issue 4 - Aug 2004
Volume 16, Issue 3 - Jun 2004
Volume 16, Issue 2 - Apr 2004
Volume 16, Issue 1 - Feb 2004
Selecting the target year
A Study on the Spacing and Required Flexural Rigidity of Cross Beams in Composite Two-Steel Girder Bridges
Park, Yong Myung ; Cho, Hyun Joon ; Hwang, Min Oh ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 1~10
A study on the evaluation of proper spacing and required flexural rigidity of cross beams in composite two I-section steel girder bridges without a lateral and sway bracing system was performed. Specifically, a 2-lane, 40-m simple span bridge and a 3-span continuous (40+50+10m) bridge were designed, and structural analyses under dead load before and after composite, live, wind, and seismic loads were performed using spacing and flexural rigidity or cross beams as parameters. Through parametric analysis, the effect on the stresses due to the combination of loads and live load distribution was investigated. In addition. material and geometric nonlinear analyses under dead load before composite were performed to evaluate the lateral buckling strength of the steel girders and cross beam. Based on the results or such analyses, the proper spacing and flexural rigidity of cross beams at intermediate points and supports were proposed.
The Strength of Square Steel Tubular Column to H-beam Connections - Focused on the connections with outside-type diaphragm -
Lee, Seong Do ; Kim, Pil Jung ; Kim, Kyu Suk ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 11~20
This paper focused on square steel tubular column to H-beam connections (concrete filled tubular) with an outside-type diaphragm. Based on the yield line theory and the nonlinear static FEM analysis the specification equations were evaluated by comparing them with previous result of the simplified tensile experiment[please check. The yield line theory applied to the mechanical model theory revised by K. Morita, the nonlinear static FEM analysis using abaqus/standard, the ultimate strength equation in the specification equation using the factor for long-time loading, and the yield ratio according to material. The allowable strength in the specification equations applied the safety factors of 2.2 and 2.6 in the cases with and without filled concrete, respectively. Therefore, the evaluation of strength(for the previous result of the simplified tensile experiment in this study) was considered possible through the yield line theory, the nonlinear static FEM analysis, and the specification equations. Likewise, the specification equations were seen to be an underestimate of the previous result of the simplified tensile experiment. The strength and displaced mesh in the FEM analysis approximated the previous result of the simplified tensile experiment.
Optimum Design of Plane Steel Frame Structures Using Refined Plastic Hinge Analysis and SUMT
Yun, Young Mook ; Kang, Moon Myoung ; Lee, Mal Suk ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 21~32
In this study, a continuous optimum design model with its application program for plane steel frame structures developed. In the model, the sequential unconstrained minimization technique (SUMT) transforming the nonlinear optimization problem with multidesign variables and constraints into an unconstrained minimization problem and the refined plastic hinge analysis method as one of the most effective second-order inelastic analysis methods for steel frame structures were implemented. The total weight of a steel frame structure was taken as the objective function, and the AISC-LRFD code requirements for the local and member buckling, flexural strength, shear strength, axial strength and size of the cross-sectional shapes of members were used for the derivation of constraint equations. To verify the appropriateness of the present model, the optimum designs of serveral plane steel frame structures subject to vertical and horizontal loads were conducted.
Evaluation of Forming Performance of Cold Rolled Steel Pipes & Tubes for Building Structure
Im, Sung Woo ; Choi, Kwang ; Chang, In Hwa ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 33~42
Making use of SN steel in the building structure should be a prerequisite to adopt the design strength of said steel. As a preceding study, the material properties of STKN400B/490B tubes and SPAP235/325 and SPAR295 square pipes manufactured using SN400B/490B plates were evaluated. Compared with the yield and ultimate strengths of SN400B/490B plates, those of STKN400B/490B tubes increase. Nonetheless, the yield and ultimate strengths of STKN400B/490B tubes satisfied the design codes of STKN400B/490B tubes even though the tubes were fabricated via roll bending or press forming. On the other hand, the yield and ultimate strengths at the edges of SPAP235/325 square pipes did not satisfy the design codes based on the values at the sides. The maximum tensile and compressive residual stresses at the SN490B tube were equal to and 40% of the yield strength of the SN490B plate, respectively, In the case of the SPAP325 square pipe, both the maximum tensile and compressive residual stresses were 80% of the yield strength of the SN490B plate. The axial compressive loaded column test results snowed that the buckling strengths were not very different regardless of the mode of fabrication of STKN490B tunes. i.e., through roll bending or press forming. On the other hand, the buckling strength of the SPAP325 square pipe was higher than that of the built-up square pipe.
Evaluation of Forming Performance of TMC Steel Pipes & Tubes for Building Structure
Im, Sung Woo ; Kim, Jong Seong ; Chang, In Hwa ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 43~49
With building structures becoming higher and having longer spans, new structural steel with better strength, thicker plate, and performance may be required rather than conventional structural steel. TMC steel is widely used in building structures largely due to its excellent seismic performance, superior weldability, and design strength that is not affected by plate thickness. To make use of TMC steel in pipe structures with large diameter and heavy wall, however, the this study, the degradation of material properties in submerged are welded SM520TMC steel pipes and tubes was evaluated using variable fabrication process and material change. Degradation test results showed that the yield and ultimate strength increased and elongation decreased regardless of the mode of fabrication, i.e., through roll bending or press forming, or steel used, i.e., domestic SM520TMC steel or SM520TMC steel from Japan.
Stress Analysis of Cold-Formed Steel Beams Considering Local Buckling Effects
Jeon, Jae Man ; Hyun, Ja Young ; Lee, Jae Hong ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 51~60
The stress analysis of cold-formed channel section steel beams under transverse load was conducted. The local buckling effect was included in the analysis using effective area concept. The proposed analytical model is capable of predicting accurate normal stress in the beam due to various behaviors including biaxial bending and warping. It was found to be appropriate for predicting stresses as well as deflection in the beam. A finite element model was developed to solve the analytical model.
Inelastic Buckling Behavior of I-Beam Under Uniform Bending
Lee, Dong Sik ; Oh, Soon Taek ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 61~72
This study investigated the inelastic lateral-torsional buckling of simply supported beams under a central concentrated load and a uniformly distributed load. A line-type finite element, method was incorporated with the "so-called" simplified and polynomial patterns of residual stresses. The effect of the load height was also considered in this study. The polynomial residual stresses assumed in this study was a quartic distribution in the flange and a parabolic distribution in the web. The inelastic lateral-torsional buckling of beam was analyzed with four different I-sections manufactured in Korea. Results obtained in this study were compared with KSDM(design method in the 1995 Korean Steel Designers' Manual). The design method in KSDM was found to be generally conservative with and without a sub-beam attached to the main beam, which acted as an intermediate restraint.
Vibration Control of Offshore Platform using Tuned Mass Damper
Kim, Ju Myung ; Lee, Gyu Won ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 73~79
Tuned Mass Damper (TMD) was applied to control the vibration of an offshore structure due to ocean waves. The errors caused by the linearization of the fluid-structure interaction effect and the phenomena when using the linearized equation of motion in TMD design were analyzed. To determine the performance of TMD in controlling vibration, both regular waves with varying periods and irregular waves with different significant wave heights were used. When the offshore structure received regular waves with a period similar to the first natural period of structure. TMD performed well in terms of response reduction. Such was not the case for the other periods. however, In the case of irregular waves, TMD triggered the reduction of structural response for waves with relatively small significant wave height. For irregular waves with relatively big significant wave height, however, TMD did not show any control effect. Therefore, TMD is useful in reducing offshore structural vibration due to ambient waves, thereby helping secure fatigue life.
Vibration Analysis for Circular Arches with Variable Cross-section by using Differential Transformation and Generalized Differential Quadrature
Shin, Young Jae ; Kwon, Kyung Mun ; Yun, Jong Hak ; Yoo, Yeong Chan ; Lee, Ju Hyung ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 81~89
The vibration analysis of the circular arch as a member of a structure has been an important subject of mechanics due to its various applications to many industrial fields. In particular, circular arches with variable cross section are widely used to optimize the distribution of weight and strength and to satisfy special architectural and functional requirements. The Generalized Differential Quadrature Method (GDQM) and Differential Transformation Method (DTM) were recently proposed by Shu and Zou, respectively. In this study, GDQM and DTM were applied to the vibration analysis of circular arches with variable cross section. The governing equations of motion for circular arches with variable cross section were derived. The concepts of Differential Transformation and Generalized Differential Quadrature were briefly introduced. The non-dimensionless natural frequencies of circular arches with variable cross section were obtained for various boundary conditions. The results obtained using these methods were compared with those of previous works. GDQM and DTM showed fast convergence, accuracy, efficiency, and validity in solving the vibration problem of circular arches with variable cross section.
The Experimental Study on Structural Performance of the Beam-Slab System
Lee, Myung Jae ; Kim, Cheol Hwan ; Lee, Seung Joon ; Kim, Won Ki ; Kim, Hee Dong ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 91~101
This study sought to suggest a structural design guide and to investigate the structural performances of the new beam-slab system in order to decrease the height of floors in high-rise steel structure apartments. Experiments were performed to assess the capacity of the new beam-slab system in a steel structure with 9.8-m span, particulary structural material test, pure bending test of composite beam, three-point bending test of composite beam, and bending and shearing tests. Results showed that the suggested composite beam had stable structural behavior when stud connectors were located in the upper flange, and upper bars were calculated normally according to the design of the slab.
A Study on the Local Buckling of H-Beams at Elevated Temperatures
Koo, Bon Youl ; Kang, Moon Myung ; Kang, Sung-Duk ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 103~111
This paper dealt with the local buckling of H-beams investigated mainly using the parameters of load ratios. load conditions, and support boundary condition considering predicted uniformly elevated temperatures. The physical properties of the material at elevated temperatures followed EC3 Park 1.2. The local buckling of the plates in steel beams show that they are governed by the yield stress or the critical stress of the steel plates according to the ratios of b/tf, d/tw. The evaluation of uniformly heated steel beams on the local buckling considered the stress and moment ratios to the LRFD.
Experimental Investigation on Deformation Capacity of CFT Column to H-Steel Beam Connections
Kim, Young Ju ; Chae, Young Suk ; Shin, Kyung Jae ; Oh, Young Suk ; Moon, Tae Sup ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 113~121
A test program was conducted on full-scale steel moment connections constructed using a T-stiffener. In the T-stiffener connection, the beam-to-column connection was reinforced with the horizontal and vertical element of the T-stiffener to resist moment under severe cyclic loads. A total of five specimens were tested in this study together with a concrete-filled tubular(CFT) column(
) and a steel beam(
). For the specimens, the T-stiffener was combined with RBS (also known as "Dog-bone") detail or Horizontal Element Hole(HEH) detail constructed to enhance deformation capacity. The test program showed excellent seismic performance for specimens constructed with an RBS or an HEH. except the specimens had brittle failure of VE. The test results also showed that the connections all developed maximum moments at the face of the column. Such moments were at least 15% and as much as 36% larger than the plastic moment capacity of the beam. based on the actual yield stress of the beam steel.
The configuration Optimization of Truss Structure
Lim, Youn Su ; Choi, Byoung Han ; Lee, Gyu Won ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 123~134
In this research, a multilevel decomposition technique to enhance the efficiency of the configuration optimization of truss structures was proposed. On the first level, the nonlinear programming problem was formulated considering cross-sectional areas as design variables, weight, or volume as objective function and behavior under multiloading condition as design constraint. Said nonlinear programming problem was transformed into a sequential linear programming problem. which was effective in calculation through the approximation of member forces using behavior space approach. Such approach has proven to be efficient in sensitivity analysis and different form existing shape optimization studies. The modified method of feasible direction (MMFD) was used for the optimization process. On the second level, by treating only shape design variables, the optimum problem was transformed into and unconstrained optimal design problem. A unidirectional search technique was used. As numerical examples, some truss structures were applied to illustrate the applicability. and validity of the formulated algorithm.
Equivalent Shrinkage Strain For Steel-Concrete Composite Girder Bridges
Bae, DooByong ; Jung, Dae Jun ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 135~144
Since Modern bridges have a tendency to make the spans continuous and longer, the effect of concrete shrinkage and creep is very important and must be evaluated appropriately for the durability and safety of steel-concrete composite bridges. However, highway design specification in current use prescribes
as the final shrinkage strain. which is for less value than one resulted from many experimental researches and cause some problems in the construction of composite bridges due to the understimation of shrinkage strain. Thus, in this paper nonlinear analysis with time-steps applying the CEB-FIP(90) provision have been conducted for plate girder bridge, box girder bridge and Preflex beam bridge and the linear equivalent shrinkage strain for the design of composite bridges. which produces the stress equal to the values from the nonlinear analysis, has been calculated by comparing the results with the values following highway design specification. The results yield appropriately double values than
which highway design specification prescribes.
Seismic base isolation for highway steel bridges using shape memory alloys
Choi, Eun Soo ; Jeon, Jun Chang ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 145~153
Conventional lead-rubber bearings may be unstable in case of strong ground motions. To address this problem, this paper proposed a new concept of isolation device wherein shape memory alloy wires were incorporated in an elastomeric bearing. A three-span continuous steel bridge was used for seismic analyses to compare the performance of lead-rubber and proposed bearings. The proposed bearings showed almost the same performance as the lead-rubber bearings. In particular, the proposed bearings limited relative displacement effectively with strong ground motions and recovered its original undeformed shape.
Inelastic Buckling Behavior of Simply Supported I-Beam under Transverse Loading
Lee, Dong Sik ; Oh, Soon Taek ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 155~167
In this paper, the inelastic buckling behavior of the beam under uniform bending was investigated using the energy-based method, which can tackle problems in fourth order eigenvalue. The pattern of residual stress was not available to satisfy the I-sections manufactured in Korea. however; therefore, the well-known polynomial and simplified pattern of residual stress was adopted in this study. The inelastic lateral-distortional buckling behavior of the beam with I-sections manufactured in Korea was investigated. The study was then extended to the inelastic lateral-torsional buckling of the beam by minimizing the out-of-plane web distortion. The inelastic lateral-torsional buckling results obtained in this paper were compared with the prediction of allowable bending stress given in the Korean steel designers' manual (1995). Results showed that the importance of inelastic lateral-distortional buckling did not arise for beams under uniform bending. Likewise, the design method in KSDM (1995) was proven to bo too conservative for intermediate and short spans of beams without intermediate bracing.
Development and Strength Evaluation of Beam-to-Column Connection Details in Weak Axis of H-shape Column
Kim, Sang Seup ; Lee, Do Hyung ; Ham, Jeong Tae ; Kim, Kyu Suk ;
Journal of Korean Society of Steel Construction, volume 16, issue 1, 2004, Pages 169~180
One of the most influential elements is the moment resisting beam-to-column connection vis-a-vis the behavior and cost of multistory steel building frames. Majority of these connections are column flange connections attached to beam frames. This is called strong-axis connection. Another type of moment resisting connection commonly found in building frames is the web axis connection. In this type of connection, the beams are attached to the plane of the column web perpendicularly. It is called the weak-axis beam. and it tends to bend the column at its weak axis. In this study, some of the fundamental behaviors of beam-to-column connections were examined by changing the connection details as weil as comparing them with previous connection details. This study sought to develop the details in the beam-to-column connection in the weak axis for middle- and low-rise steel construction systems.