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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 21, Issue 6 - Dec 2009
Volume 21, Issue 5 - Oct 2009
Volume 21, Issue 4 - Aug 2009
Volume 21, Issue 3 - Jun 2009
Volume 21, Issue 2 - Apr 2009
Volume 21, Issue 1 - Feb 2009
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Response of Bridge Piers Retrofitted by Stainless Steel Wire under Simulated Seismic Loading
Choi, Jun Hyeok ; Kim, Sung Hoon ; Lee, Do Hyung ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 343~350
In the present study, a new seismic retrofitting method that employs both a stainless steel wire mesh and a permeable polymer concrete mortar was proposed for reinforced concrete bridge piers with nonseismic design details. For this purpose, a total of six nonseismically designed bridge piers were tested under lateral load reversals. The test results reveal that nonseismically designed piers with lap splices need to be retrofitted to resist earthquake induced forces. In addition, it was proven that the proposed retrofitting method can be useful in improving the strength, stiffness, and energy dissipation capacities of bridge piers designed nonseismically. It is thus expected that the proposed method may provide an improved ductility capacity without sudden softening of strength for bridge piers excursing inelastic displacement range.
An Experimental Study on the Buckling Strength of subject to Asymmetrical Double Curvature Stainless Steel Circular Hollow Section Beam-Columns
Jang, Ho Ju ; Park, Jae Seon ; Yang, Young Sung ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 351~360
This study is a series of experimental investigations of the buckling strengths of eccentrically compressed, cold-formed, stainless-steel, circular, hollow-section beam columns. The principal parameters that were used in this study were the slenderness ratios (Lk/r = 30, 50, 70) and the magnitude of eccentricity e(one way: 0, 25, 50, 75, and 100mm: the other way: 0, 12.5, 25, 37.5, and 50mm) on the asymmetrical end-moment of a double curvature. The objectives of the study were to obtain the maximum loads through an experiment and to compare the experimental behaviors with the analysis results. The ultimate buckling strength of the square section members were evaluated using a numerical method, in accordance with the bending moment-axial force(M-P) interaction curves. The behavior of each specimen was displayed in the form of the strength-displacement and moment-angle(M-
Opitmal Design Technique of Nielsen Arch Bridges by Using Genetic Algorithm
Lee, Kwang Su ; Chung, Young Soo ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 361~373
Using the genetic algorithm, the optimal-design technique of the Nielsen arch bridge was proposed in this paper. The design parameters were the arch-rise ratio and the steel weight ratio of the Nielsen arch bridge, and optimal-design techniques were utilized to analyze the behavior of the bridge. The optimal parameter values were determined for the estimated optimal level. The parameter determination requires the standardization of the safety, utility, and economic concepts as the critical factors of a structure. For this, a genetic algorithm was used, whose global-optimal-solution search ability is superior to the optimization technique, and whose object function in the optimal design is the total weight of the structure. The constraints for the optimization were displacement, internal stress, and time and space. The structural analysis was a combination of the small displacement theory and the genetic algorithm, and the runtime was reduced for parallel processing. The optimal-design technique that was developed in this study was employed and deduced using the optimal arch-rise ratio, steel weight ratio, and optimal-design domain. The optimal-design technique was presented so it could be applied in the industry.
Seismic Behavior of Web-Continuous Diagrid Nodes
Jeong, In Yong ; Kim, Young Ju ; Ju, Young K ; Kim, Sang Dae ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 375~384
The application of the diagrid structural system has increased of late, but cyclic loadings such as winds and earthquakes cannot be fully understood through only an analytical study due to the difficulty of considering its welding property. In this study, diagrid nodes that had been scaled down to 1/5 of their full sizes were tested to find out their structural behavior under seismic or wind loads. Four specimens were used with five parameters, including the welding method and the design details. Cyclic loading tests were carried out, where a tensile load was applied to one brace member and a compression load to the other. The major failure modes in the tests were only failure of bending with tensile stress and tension failure. The welding method and the design details had no effect on the initial stiffness and yielding stress but play a significant role in the failure mode and energy dissipation, respectively.
Assessment of Confining Effect of Steel and GFRP Jackets for Concrete
Choi, Eunsoo ; An, Dong Jun ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 385~392
In this study, the confining effect of the proposed steel jackets and GFRP tubes for concrete was investigated. The new steel jacket differs from the existing steel jacket in terms of installation technique and behavior. Thus, it is necessary to assess its confining effect on concrete. Moreover, the method was compared to GFRP tubes to investigate its strong and weak points. The confining effect of the proposed steel jacket was shown to correspond with that presented in the previous researches. The GFRP jacketing method, however, does not show any confining effect in some cases, according to the tube thickness and concrete peak strength as such, the previous assessment equation cannot be used in such cases. Thus, in this study, a new method of assessing the peak strength of confined concrete was suggested, and the minimum thickness was determined to show the confining effect. Lastly, the ultimate strains of concrete that had been confined through the two methods were compared to assess their ductile behavior.
Estimation for Equivalent Flexural Stiffness of Innovative Prestressed Support(IPS) Wale
Kim, Sung Bo ; Kim, Hun Kyom ; Heo, In Sung ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 393~401
The flexural-stiffness formula of the wale for the innovative prestressed support (IPS) system was precisely derived, and the equivalent beam stiffness was introduced for application in the actual design of the IPS wale. The cable tension forces of the IPS wale were calculated in both cases, and the axial-deformation effects were included and ignored, respectively. The central displacements of the 1-post, 2-post, 3-post, and 4-post IPS wales were calculated based on the principle of virtual work. The effects of the IPS wale length and cable inclination angle were also investigated using the derived central displacements. The simplified equivalent flexural stiffness of the IPS wale is presented herein for design purposes, and the validity of the proposed design formula was verified through its comparison with the FE and analysis solutions.
Nonlinear Earthquake Analysis of a Steel Girder Bridge using Point Hinge Models
Lee, Do Hyung ; Kim, Yong Il ; Lee, Doo Ho ; Jeon, Jeong Moon ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 403~411
In the present study, nonlinear earthquake analysis was carried out for a steel girder bridge that had been damaged by the 1995 Kobe earthquake. For such analysis, the use of hysteretic models describing flexure-axial and shear-axial interaction was suggested. The models were incorporated into a structural analysis program in terms of the joint elements representing hinge models, and then a simplified analysis scheme using the hinge models was employed for bridge piers. The analytical predictions of the flexure-axial interactive hinge model show a good correlation with those of the detailed fiber element model. In addition, the analytical predictions of the flexure-shear-axial interactive hinge model enable a displacement component to be separately captured. It is thus recognized that the present study can be a useful scheme for the healthy evaluation of the global displacement performance of piers subjected to earthquake excitation.
Monitoring-Evaluation System for Lifting Heavy Structures using 3D Location Data
Lee, Myung Ho ; Chun, Sung Chul ; Oh, Bohwan ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 413~420
Heavy structures such as large roof structures and superbeams were lifted using hydraulic jacks. Moreover, member verticality and horizontality checks were performed at every construction stage to monitor the measuring tapes for their structural safety, using CCTV. When the relative displacement exceeded the predetermined limit, the hydraulic systems were terminated. After adjusting the relative displacement manually, lifting was resumed. The accuracy of the relative displacement was found not to be reliable, however, due to eye check using CCTV, and it took a long time due to manual adjustment. Moreover, real-time monitoring was impossible. To address these problems, the monitoring-evaluation system for the stable lifting of heavy structures was proposed, using the total station of the automatic-target-recognition type, laser-distance-measuring devices, a data logger, a strain gauge, and others. After developing a program for the operation of the system and for the acquisition of data, a mock-up test was conducted in a large-scale structural laboratory to evaluate the accuracy and applicability of the system. The stable acquisition and applicability of data was confirmed in the test.
Static Behavior of Steel-Concrete Composite Beam with Perfobond Rib Shear Connector
Ahn, Jin Hee ; Chung, Hamin ; Kim, Sang Hyo ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 421~432
In this study, push-out and static loading tests were conducted to evaluate the behavioral characteristics of composite beams with a perfobond rib shear connector. The shear capacity of the perfobond rib was found to be proportional to its concrete strength, which is in turn affected by the increase in the concrete end-bearing strength and concrete dowel action to resist the shear force. The relative slips of the push-out specimen, however, which was used to assess the ductility of the shear connector, increased to some extent, but it no longer increased when it reached the critical concrete strength because of the flexibility of the transverse rebar in the rib hole. The static-loading-test results revealed a crack on the concrete slab in the composite beam with a perfobond rib on the side of the rib hole and transverse rebar for the applied moment and shear force to the rib hole, depending on the static loading. The shear resistance characteristics of the perfobond rib shear connector were found to resist the shear force from the relative slip on the interface of the composite beam. Thus, the sectional effect of the shear connector to the composite beam with a perfobond rib should be considered when designing the composite beam because the behavior of the composite beam can change owing to the shear connector.
Three-Dimensional Vibration Analysis of Solid Cylinders of N-Sided Polygonal Cross-Section Having V-notches or Sharp Cracks
Kim, Joo Woo ;
Journal of Korean Society of Steel Construction, volume 21, issue 4, 2009, Pages 433~442
In this paper, new three-dimensional vibration data for the solid cylinders of the N-sided polygonal cross-section with V-notches or sharp cracks are presented, and a Ritz procedure is employed, which incorporates a mathematically complete set of algebraic-trigonometric polynomials in conjunction with an admissible set of edge functions that explicitly model the tri-axial stress singularities that exist along a terminus edge of the V-notch. Convergence studies demonstrate the necessity of adding the edge functions to achieve the accurate frequencies and mode shapes of N-sided polygonal cylindrical solids with stress singularities.