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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 24, Issue 6 - Dec 2012
Volume 24, Issue 5 - Oct 2012
Volume 24, Issue 4 - Aug 2012
Volume 24, Issue 3 - Jun 2012
Volume 24, Issue 2 - Apr 2012
Volume 24, Issue 1 - Feb 2012
Selecting the target year
An Experimental Study For Improvement of Joint Detail of Steel Pier - Foundation
Kim, Hee-Ju ; Ham, Jun-Su ; Yang, Sung-Don ; Hwang, Won-Sup ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 491~501
DOI : 10.7781/kjoss.2012.24.5.491
Generally, a steel pier-foundation has been designed and constructed with a anchor frame. However, because of the complicated design and construction, the foundation`s size has become large and has been overdesigned. In this study, three specimens were made and the tests were conducted to suggest a new shape in regard to the pier-foundation`s joint details using the high performance steel. One of the specimens was made up of the general anchors and the anchor frame. Another specimen consisted of the high tension anchors and the studs, and the other specimen was composed of the high tension anchors and the inner steels. After the performance of each specimen was compared and analyzed, the behavior characteristics according to the joint were analyzed.
Proposal of Estimation Equation for Nominal Strength of Longitudinal Fillet Welds with Different Types of Steel
Jo, Jae-Byung ; Lee, Hye-Youn ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 503~510
DOI : 10.7781/kjoss.2012.24.5.503
High performance, high strength steels were developed and used in steel structures recently. Since the newly developed high strength steels posses different toughness, weldability, yield strength ratio, etc. in compare with conventional structural steels, it is requred to investigate the applicability of the design strength of fillet weld specified in the existing design codes. The comparison of the design strengths of various codes from domestic and overseas shows quite a difference. Test results for fillet weld strengths were collected and statistically analysed. Each of yield strength, tensile strength of parent material and tensile strength of weld metal was selected as a main parameter for each estimation equation respectively. All the estimation equations yield almost same values for each type of steel regardless the type of main parameter selected. Considering the behaviour of fillet welded joints and for practical purposes, it is proposed that the equation with tensile strength of parent material is to be used in design codes. The comparison with the proposed nominal strengths of fillet welds shows that the existing design codes could lead to an uneconomical result for low strength steels and lie on an unsafe side for high strength steels.
Design Formula for the Flexural Strength of a Double Split Tee Connection
Yang, Jae-Gue ; Kim, Joo-Wo ; Kim, Yu ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 511~520
DOI : 10.7781/kjoss.2012.24.5.511
The double split Tee connection, a type of full strength-partially restrained connection, has adequate flexural strength according to the changes in the thickness of the T-stub flange and the gauge distance of the high-strength bolts. Moreover, the double split Tee connection is designed and constructed with seismic connections that have enough ductility capacity applicable to ordinary moment frame and special moment frame by grade of steel, size of beam and column and geometric connection shape. However, such a domestic research and a proposal of a suitable design formula about the double split Tee connection are insufficient. Thus, many experimental and analytical studies are in need for the domestic application of the double split Tee connection. Therefore, this study aimed to examine and suggest feasibility of a design formula of the double split Tee connection of FEMA.
Study on the Flexible Strength of U-shape Hybrid Composite Beam
Kim, Sung-Bae ; Kim, Sang-Seup ; Lee, Won-Rok ; Kim, Jung-Yeon ; Lee, Seung-Bae ; Ryu, Deog-Su ; Kim, Dae-Hoi ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 521~534
DOI : 10.7781/kjoss.2012.24.5.521
In this research, we carry this study into effect on the basis of utilizing character of composite beam and developing applicable section to some of high strength steel. We evaluated flexural capacity of composite beam that is a unit member through experiments. The existing nominal strength formula of Composite Beam which is a previous method was reviewed and the experiment had been progressive by using each composite members as main variables though the result. Capacity evaluation of U-shape Hybrid Forming Beam(HyFo Beam) which is a new shape show as follow from the result. First, it is resonable to resist demand moment by couple moments which are occurred in concrete compressive-strength and steel tensile-strength. Second, the capacity was stably increased in proportion to the depth of beams and the thickness of steel plates. The last, HyFo Beam was showed as ductile behavior.
Flexural Test for Prefabricated Composite Columns Using Steel Angle and Reinforcing Bar
Eom, Tae-Sung ; Hwang, Hyeon-Jong ; Park, Hong-Gun ; Lee, Chang-Nam ; Kim, Hyoung-Seop ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 535~547
DOI : 10.7781/kjoss.2012.24.5.535
PSRC column is a concrete encased steel angle column. In the PSRC column, the steel angles placed at the corner of the cross-section resists bending moment and compression load. The lateral re-bars welded to steel angles resist the column shear and the bond between the steel angle and concrete. In the present study, current design procedures in KBC 2009 were applied to the flexure-compression, shear, and bond design of the PSRC composite column. To verify the validity of the design method and failure mode, simply supported 2/3 scaled PSRC and correlated SRC beams were tested under two point loading. The test parameters were the steel angle ratio and lateral bar spacing. The test results showed that the bending, shear, and bond strengths predicted by KBC 2009 correlated well with the test results. The flexural strength of the PSRC specimens was much greater than that of the SRC specimen with the same steel ratio because the steel angles were placed at the corner of the column section. However, when the bond resistance between the steel angle and concrete was not sufficient, brittle failures such as bond failure of the angle, spalling of cover concrete, and the tensile fracture of lateral re-bar occurred before the development of the yield strength of PSRC composite section. Further, if the weldability and toughness of the steel angle were insufficient, the specimen was failed by the fracture of the steel angle at the weld joint between the angle and lateral bars.
Damage Detection of Truss Structures Using Genetic Algorithm
Kim, Hyung-Mi ; Lee, Jae-Hong ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 549~558
DOI : 10.7781/kjoss.2012.24.5.549
This study identifies the damage detection of truss structures by using genetic algorithm(GA) from changed elements properties. To model the damaged truss structures, the modulus of elasticity of some specific elements is reduced. The analysis of truss structures is performed with static analysis by applying uniform load, and the location and extent of structural damage is detected by comparing the stain of each element of healthy truss structures with damaged truss structures using genetic algorithm. In this study, some numerical examples are presented to detect the location and extent of damage using genetic algorithm.
The Characteristics of Structural Behavior of Temporary Bridge Using Continuous Cross Beam
Joo, Hyung-Joong ; Lee, Young-Geun ; Lee, Dong-Hyuk ; Yoon, Soon-Jong ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 559~569
DOI : 10.7781/kjoss.2012.24.5.559
Cross-beam in the existing temporary bridge system is usually installed to prevent the lateral-torsional buckling of girders and to promote the construction efficiency. However, most of this cross-beams are connected to the girder web by bolts, and therefore, gravitational load resisting capacity of the cross-beams are negligibly small. In recent years, new temporary bridge system, in which the cross-beams and girders are connected to resist the external loads as a unit, was developed. In this paper, we present the experimental and analytical study results pertaining to the structural behavior and load carrying capacity of new temporary bridge system. From the results of study, it was found that the continuous cross-beam increased the flexural rigidity and reduced the maximum flexural stress in the girder. In addition, it was also found that the new temporary bridge system developed is more appropriate for the application in the long-span temporary bridge.
Experimental Verification of Age-adjusted Effective Modulus Method to Long-Term Behavior Estimation of Prestressed Composite Girders
Bae, Doo-Byong ; Oh, Chang-Kook ; Choi, Sok-Hwan ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 571~582
DOI : 10.7781/kjoss.2012.24.5.571
Prestressed composite girders provide efficient composite action by applying prestress to the sub-encasing concrete. In this study, an enhanced prestressed composite girder with forms suspended from the steel girder is utilized. Long-term behavior of the prestressed composite girder is estimated using age-adjusted effective modulus method, which is verified experimentally using measurements obtained from an in-service bridge. Then, parametric study is carried out to investigate the influences caused by ambient temperature, humidity, prestressing and concrete casting date.
Compressive Behavior of Steel Plate-Concrete Structures using Eco-Oriented Cement Concrete
Kang, Cheol-Kyu ; Choi, Byong-Jeong ; Jeoung, Beak-Seon ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 583~593
DOI : 10.7781/kjoss.2012.24.5.583
The domestic research of the steel plate concrete structures have been focused on the nuclear structures requiring much strong resistance. There are many advantages in the steel plate-concrete structures such as the possibility of prefabricated production and modular construction. This research tried to establish some basic design information of SC structures toward mid to low-rise general buildings with low strength. To reduce the strength mentioned, the some of the cement in weight was replaced by the soils which are traditional and environmental oriented material where the new system can be used to general buildings. This paper studied on the compressive characteristics, effective length factors, buckling loading, steel plate buckling, and stud strength using the compression member subjected to the concentrated compression loadings.
Load Carrying Capacity Assessment of Bridges with Elastic Supports Application
Yang, Seung-Hyun ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 595~603
DOI : 10.7781/kjoss.2012.24.5.595
This study applied elastic supports in order to evaluate load carrying capacity using measurement data obtained from load tests actively and utilizing various evaluation methods. In order to confirm the adequacy of structural analysis based on elastic supports and to improve the reliability of experiment results, we conducted a deflection test with flexural beams prepared as overhanging beams and, based on the results, performed precision safety diagnosis for real bridges under public service for improving the load carrying capacity evaluation method for bridges under public service. In the results of the bending test, compared to deflection calculated by the existing method, deflection obtained by applying elastic supports was closer to the actually measured deflection. In the results of evaluating load carrying capacity for a 3 span continuous steel box girder bridge just after its completion, load carrying capacity by elastic supports was smaller by up to 39% than that by the existing method. When the load carrying capacity of bridges is evaluated by the existing method the results vary among engineers due to lack of guidelines for evaluation such as the application of stress modification factor. This study was conducted as an effort to solve this problem through active research.
Change of Strength of High-Strength Bolted Connection Depending on Standard and Over Bolt Hole
Yang, Seung-Hyun ;
Journal of Korean Society of Steel Construction, volume 24, issue 5, 2012, Pages 605~612
DOI : 10.7781/kjoss.2012.24.5.605
A tension member that has a high-strength bolt fastened to a standard bolt hole increases structural resistance but causes problems from workability or economic perspectives. In this research, a total of 28 samples that have standard and over bolt holes as the tension member`s high-strength bolted connection were made and a tension test was conducted. The change of strength of the connection has been confirmed by comparing the tension load of standard and over bolt hole samples obtained from the test results with the design strength due to net section and end distance. Samples made with over bolt holes had a lighter tension load than that of samples made with standard bolt holes, exceeded the design strength of present design standards, and although decrease in strength was inevitable due to the over bolt hole, their safety was satisfactory.