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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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Korean Society of Steel Construction
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Volume & Issues
Volume 18, Issue 6 - 00 2006
Volume 18, Issue 5 - 00 2006
Volume 18, Issue 4 - 00 2006
Volume 18, Issue 3 - 00 2006
Volume 18, Issue 2 - 00 2006
Volume 18, Issue 1 - 00 2006
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Stress Concentration at Connection and Cut-Out Parts according to Existence of Scallop and Diaphragms on Orthotropic Steel Decks
Shin, Jae Choul ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 289~299
Orthotropic steel decks are manufactured by welding thin plates therefore it is inevitable that there are abundant works of welding process. On connection of transverse rib web, crossing point of longitudinal rib, transverse rib and deck plate and cut-out parts of transverse rib are the significant position of stress concentration phenomenon because of out of plane and oil-caning deformation caused by longitudinal rib distortion with shear force and distortion. In order to reduce the stress concentration phenomenon and improving fatigue performance at the crosing point and cut-out, structural analysis was performed considering the existence of scalop at conection and diaphragm which have same plane with transverse rib placed inside of longitudinal rib. Result o f the analysis show that there are the largest efect of stres concentration reduction when diaphragms are installed without scallop at connection, therefore these detail can improve the fatigue performance of orthotropic steel decks.
In-plane buckling strength of fixed parabolic arch
Moon, Ji Ho ; Yoon, Ki Yong ; Cho, Yong Rae ; Lee, Hak Eun ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 301~310
If arches are braced by lateral restraints, the ultimate strength of arches is determined by in-plane buckling and plastic bending collapse. This paper is conducted to investigate the in-plane nonlinear elastic and inelastic buckling behavior and the strength of fixed parabolic arches in uniform compresion, as well as to study arch behaviors against non-uniform in-plane compression and bending. As shown by the results, the limit slenderness ratio is suggested to classify the bucklingmode. Buckling strength of fixed parabolic arches under uniform compresion are evaluated using buckling curve for a straight column. Finally, an interaction e quation for arches under combined axial compresion and bending action is proposed.
Analytical Models for the Initial Stiffness and Ultimate Moment of a Double Angle Connection
Ang, Jae Geun ; Lee, Gil Young ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 311~320
This study has ben conducted to investigate the effect of the number of bolts on stiffness and strength of a double-angle connection and to propose two simplified models that can predict the initial stiffness and ultimate connection moment of a double-angle connection, respectively. In adition, we also aim to provide some basic reference data for structural designers to choose the most adequate prediction equation and to more precisely double-angle connection.
Local Buckling Behavior of Tapered Members under Cyclic Loading
Lee, E.T. ; Kim, Jong Won ; Park, Ji Hoon ; Shim, Ju Yeon ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 321~329
The use of tapered structural members was first proposed by Ami rikian for the economical use of materials.Generaly, tapered members are used in single-story structures with one or more bays and in cantilevered sections of ate architectural representation. If only focused on the section performance, however, the width-to-thickness ratio or t apered ratio can exced regulations. Such a case requires a study on the behavior of tapered members. To investigate the plastic and local buckling behavior of web-tapered beams, seven steel beams were the tapered ratio and the width-to-thicknes ratio. The results of maximum strength, strength deterioration, and stiffnes deterioration were compared.
Effects of Plate Thickness and Weld Size on the Strength of Fillet Welded Lap Joints
Jo, Jae Byung ; Jung, Kyoung Sup ; Lee, Jeong Woo ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 331~337
Specimens with fillet-welded lap joints were fabricated from 20 mm, 60 mm, and 82 mm thick steel plates produced by Thermo Mechanical Control Process. The designed sizes of filet welds were betwen 6 mm and 16 m. The welds' axes were parallel with or perpendicular to the direction of loading or a combination of them. Specimens were axialy loaded in tension and the strength of fillet-welded joints were measured. Test results showed that the strengths of filet-welded joints are higher than the nominal strengths calculated for all the cases tested, and also approximately on the same level regardless of plate thickness and fillet weld size. Especially, the specimens with weld size les than that required by Korean design rules showed no visible defects on welds and also no str ength reduction.
Behavior of Negative Moment Region of Continuous Double Composite Railway Bridges
Shim, Chang Su ; Kim, Hyun Ho ; Yun, Kwang Jung ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 339~347
This study proposes a double-composite section to enhance the s serviceability of twin-girder railway bridges, especially in terms of the flexural stiffness of the composite section in negative-moment regions. This paper deals with experiments on continuous twin-girder bridge models with 5m-5m span length with the proposed double-composite action. From results of static tests on the bridge models, several design considerations were investigated including effective width, shear connection and ultimate strength of the double-composite concrete slab showed full shear connection, which verified the suggested empirical equation. From the flexural behavior of the double-composite section, the effective width of the bottom concrete slab can be evaluated as that of the concrete slab under compression. The ultimate flexural strength of the bridge models verified the validity of the rigid plastic analysis of the double-composite section. Design guidelines were suggested based on the test results.
A C Finite Element of Thin-Walled Laminated Composite I-Beams Including Shear Deformation
Baek, Seong-Yong ; Lee, Seung-Sik ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 349~359
This paper presents a new block stiffness matrix for the analysis an orthogonal Cartesian coordinate system. The displacement fields are defined using the first order shear deformable beam theory. The longitudinal displacement can be expressed as the sum of the projected plane deformation of the cross-section due to Timoshenko's beam theory and axial warping deformation due to modified Vlasov's thin-waled beam theory. The derived element takes into account flexural shear deformation and torsional warping deformation. Three different types of beam elements, namely, the two-noded, three-noded, and four-noded beam elements, are developed. The quadratic and cubic elements are found to be very efficient for the flexural analysis of laminated composite beams. The versatility and accuracy of the new element are demonstrated by comparing the numerical results available in the literature.
Evaluation of inelastic performance of moment resisting steel frames designed by resizing algorithms
Seo, Ji Hyun ; Kwon, Bong kwon ; Park, Hyo Seon ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 361~371
In recent years, to overcome drawbacks related to the aplicati on of classical structural optimization algorithms, various drift design methods based on factores of member displacement participation factors have been developed to size members if they satisfy stiffness criteria. In particular, a resizing algorithm based on dynamic displacement participation factors from the response spectrum analysis has been applied in the drift design of steel structures subjec ted to seismic lateral forces. In this aproach, active members are selected for displacement control based on the displacement participation fa ve members may be taken out and added to the active members for the drift control. The resizing algorithm can be practically and effectively applied to drift design of high-rise buildings however, the inelastic behavior o f the resizing algorithm has not ben evaluated yet. To develop the resizing algorithm considering the performance of nonlinearity as well a s elastic stifness, the evaluation model of resizing algorithm s is developed and aplied to the examples of moment-resisting steel frame, which is one of the simplest structural systems. The inelastic behavior of moment-resisting steel frame designed by the resizing algorithm is also discussed.
Evaluation for Approximate Bending Moment Coefficients of Non-Composite Form Deck One-Way Slab considering Unequaled Elastic Deflection of Steel Beams
Kim, Ho Soo ; Lim, Young Do ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 373~383
In a steel structural system, noncomposite form deck one-way slab is the plate element supported by four-edged steel beams with unequaled stiffness. However, design criterion has analyzed the one-way slab as the continuous beam. Because the end beams that support the one-way slab have elastic supports t hat cause different deflections according to the support conditions and locations, the bending moments corresponding to the support ic support effect is not considered in the design criterion. Accordingly, to conduct a reasonable estimation of approximate moment coefficients considering the unequaled elastic support conditions, this study analyzes and estimates various models with varia bles for the ratios of live load to dead load and pattern arangements of live loads and span lengths. The analytical methods considering the finite three-dimensional plate element, the two-dimensional elastic support and the infinite stifnes suport are performed.
Elasto-plastic behaviour of structural laminated timber joint by flange thickness of H beam
Kim, Soon Chul ; Yang, Il Seung ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 385~393
In Korea, the effective utilization of wod structure is encour aged to preserve natural resources and the global environment.ote demand for wod. The efective combination of structural la minated timber and other materials is expected to extend the potential of building structures. This research examines the moment resis tance-type jointing method using structural laminated timber and H-section stel aiming at development of the two-direction frame for lar ge 9 mm and 12 mm) of the H section. Therefore, we conducted the experiment with bending test of the joints to investigate the s tifnes, strength, strain distributions of laminated timber an d of the flange of the H section, and failure paterns. As shown in the results, t he joints with a flange thicknes of 9 mm and 12 m have superi or strength with a flange thicknes of 9 mm and 12 mm were very large, whic h confirmed the high level of energy absorption of such structure s.
Characteristics of Mechanical Properties at Elevated Temperatures and Residual Stresses in Welded joint of SM570-TMC Steel
Lee, Chin Hyunng ; Chang, Kyong Ho ; Park, Hyun Chan ; Lee, Jin Hee ;
Journal of Korean Society of Steel Construction, volume 18, issue 3, 2006, Pages 395~403
Recently constructed bridges often have long spans and simple structure details considering not only the function but other important factors such as aesthetics, maintenance, construction duration and life cycle cost. Therefore, bridges require high-performance steels like extra-thick plate steels and thermo-mechanical control process (TMCP) steels. TMCP stels are now gaining wide attention due to their weldability improved strength and toughness. Recently, SM570-TMC steel, which is a high-strength TMCP steel with a tensile strength of 600 MPa, has been developed and applied to steel structures. However, using this steel in building steel structures requires the elucidation of not only material characteristics but also the mechanical characteristic of welded joints. In this study, high-temperature tensile properties of SM570-TMC steel were investigated through the elevated temperature welded joints of SM570-TMC steel were studied through the three-dimensional thermal elasticplastic analyses on the basis of mechanical properties at high temperatures obtained from the experiment.