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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
A Study on Influencing Factors in BWIM System and Its Field Applicability
Yoo, Dong Gyun ; Kyung, Kab Soo ; Lee, Sung Jin ; Lee, Hee Hyun ; Jeon, Jun Chang ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 251~262
DOI : 10.7781/kjoss.2014.26.4.251
It has been considered that factors affecting accuracy of the estimated weight of moving vehicle by BWIM system are vehicle and bridge characteristics, and measurement conditions which is related to the strain curve. In this study, theoretical review and field test were performed to evaluate effect of these factors in BWIM system. From these evaluations, we proposed a way to improve accuracy of the estimated vehicle information in BWIM system. As the results, it was known that girder type and continuity of spans in bridge are not governing factor, but its plane shape gives large influence on accuracy of the estimated vehicle information. In addition, running speed of vehicle has also large effect on the estimated accuracy of axle distance if the distance between second and third axles is short. However, weight sum of the two axles can be estimated reasonably by assuming them as one axle.
Cyclic Loading Test on Connection of SRC Column-Composite Beam Consisting of H-Section and U-Section Members
Kim, Young Ju ; Bae, Jae Hoon ; Ahn, Tae Sang ; Kim, Jin Won ; Ryu, Hong Sik ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 263~275
DOI : 10.7781/kjoss.2014.26.4.263
In this study, connection of steel reinforced concrete(SRC) column and composite beam which consists of H-section and U-section members were tested under cyclic loading. An essential point of the composite beam is the structural performance of welded joint between the H-section and the U-section members. To improve the structural performance of joint of two beam members, vertical stiffeners, trapezoidal stiffeners, and top bars were used. Five full-scaled specimens were designed to study the effect of a number of parameters on cyclic performance of connections such as H-section beam size(
), the presence of stiffeners and top bars, and the presence of no weld access hole(WAH) method. Based on the test results, deformation capacity of the specimens with H-500 series beam and H-600 series beam were 4% and 3% rotation angle, which is the requirement for the Special Moment Frame and Intermediate Moment Frame(IMF), respectively. Test result showed that deformation capacity of connection with stiffeners and top bars is greater than that of connection without stiffeners and top bars. Finally, energy dissipation capacity and strain profile of specimens were summarized.
The Local Behavior Characteristics of a Plate Stiffened with Closed Ribs
Chu, Seok Beom ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 277~288
DOI : 10.7781/kjoss.2014.26.4.277
In this study, the local displacement and moment characteristics of a plate stiffened with closed ribs are analyzed according to the dimensions of stiffened plates. The analyzed results of various stiffened plates under square distributed load show that the effect of the loading panel width to the local behavior is dominant but that of the next panel width is very small. And the local behavior of reference stiffened plates can be expressed by the angle between the plate and the rib, and that of other stiffened plates can be obtained by multiplying ratio functions of the loading panel width, plate thickness, rib thickness, rib height and next panel width and they give good results. Applying ratio functions to other loading sizes shows that the applicability of ratio functions except for the loading panel width is proved and the modified ratio functions of the loading panel width improve error ratios. Therefore, the local displacement and moments of a plate stiffened with closed ribs can easily achieve proper results regardless of the dimensions using ratio functions proposed in this study.
An Experimental Study on the Structural Behavior of Stub Columns with HSA800 High-strength Steels under Eccentric Loads
Lee, Kangmin ; Lee, Myung Jae ; Oh, Young Suk ; Oh, Keunyeong ; Hong, Sungbin ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 289~297
DOI : 10.7781/kjoss.2014.26.4.289
Recently, high performance steels have been utilized to structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. In this paper, flexure-compression members with the high-strength steel were experimentally evaluated to satisfy the design criteria when stub columns fabricated with HSA800 steel were eccentrically loaded. This test was conducted on box-shaped and H-shaped steels stub columns with high-strength steel to verify the P-M interaction of members subjected to combined forces according to axial load ratios. The results showed that all specimens were satisfied the requirements of Korean Building Code(KBC2009) for using of structural members.
Alternative Design of Mega Structural Members of a Super-tall Building using 800MPa Grade High-performance Steel Plate
Cho, So Hoon ; Kim, Do Hwan ; Kim, Jin Won ; Lee, Seung Eun ; Kim, Jin Ho ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 299~309
DOI : 10.7781/kjoss.2014.26.4.299
HSA800 is a new high strength steel (HSS) plate for building structures developed by POSCO and RIST in 2011. It has upper and lower bounds for yield (
) and tensile (
) strength as of 650-770MPa and 800-950MPa, respectively, with yield ratio (
) limit as of 0.85 which make steel quality more reliable and enhance the seismic resistance of structures. As made by TMCP, it has a good weldability without increasing carbon percentage. The objective of this study is to provide alternative design of mega-structural members of the Lotte World Tower (555m, 123 story), a first super-tall building in Korea, using HSS considering structural safety, constructability, and cost-effectiveness. Steel outrigger trusses, belt-trusses and steel exterior columns were selected and analyzed to evaluate the structural performance between original and alternative designs using HSS. The results show that HSS can be applied to the members which do not affect lateral stiffness of a building and, in this study, approximately 1100tons of steel were saved. It implies that HSS can save overall construction costs - manufacturing, delivery, and erection costs - by reducing mega structural member size. HSA800 was very first applied to the Lotte World Tower based on the results of this study.
Seismic Evaluation of Welded-formed square Column-Beam Connection for External Diaphragm Stress path
Kim, Sun Hee ; Yom, Kyong Soo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 311~322
DOI : 10.7781/kjoss.2014.26.4.311
Concrete filled tubular structure should be installed diaphragms for moment connection. However internal and through diaphragm should be special welded when connected to column tube. The other hand, that has become increase of stress concentration and extend of construction error. Therefore, In this study the seismic performance of beam to column connections with External Diaphragms and implement cycle loading experiment. we had evaluated seismic performance with mentioned experiment which is concrete filled or not, variable shapes, to be welded or not of diaphragm. Also, formula of strength of external diaphragm was analyzed and looked into adequacy with regard to formula of tension strength.
Evaluation of Fire Resistance of Unprotected Concrete-filled Rectangular Steel Tubular Columns under Axial Loading
Ahn, Jae Kwon ; Lee, Cheol Ho ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 323~334
DOI : 10.7781/kjoss.2014.26.4.323
In this paper, experimental program and associated numerical study were carried out to evaluate the fire resistance of unprotected concrete-filled rectangular steel tubular (CFT) columns subjected to the standard fire. The key testing parameters included the length effect, the load ratio, and the sectional dimensions of the CFT columns. Temperature distribution and axial deformation of the CFT column specimens were measured and analyzed. Rather early local buckling of steel tubes was observed in all the specimens. This caused subsequent load transfer from steel tube to concrete, and eventually triggered concrete crushing, or complete loss of the load bearing capacity of the column. This implies that the limit state of local buckling as well as overall flexural buckling should be incorporated in fire design procedure. As expected, the fire resistance time of specimen with higher load ratio consistently lessened. The prediction of fire resistance time of unprotected CFT columns based on the limiting steel temperature in current design codes or the formula proposed by previous studies is slightly conservative compared to the fire test results available. To establish the finite element analysis model that can be used to predict the thermal and structural behaviour of unprotected CFT columns in fire, the fully coupled thermal-stress analysis was also tried by using the commercial code ABAQUS. The numerical results showed a reasonable global correlation with the experimental results.
A Study on Deformation Capacity of High Strength Steel Beam-to-Column Connections According to Welding Detail at Beam End
Oh, Sang Hoon ; Park, Hae Yong ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 335~348
DOI : 10.7781/kjoss.2014.26.4.335
For high-strength steel, it is difficult to be applied to flexible structural member because it have high yield ratio and low basic material`s toughness. One of the great problems when using high-strength steel connections is the brittle fracture at the end of the beam member in common with general mild steel connections. In the cases of mild steel connections, it has be developed that special moment frame connection details by reinforcing structural member or improvement of welding access hole. But, it is incomplete at yet about applicability estimation of high-strength steel connections. This study is the initial step research for the applicability estimation of beam-to-column connections being applied to developed high-strength steel, HSA800. And, it studied about structural performance of the high-strength steel connections according to the details of welding access hole through full-scale test and analytical method.
Behavior and Strength of Rib Stiffened SC Wall-slab Connection
Park, Joung Hak ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 349~359
DOI : 10.7781/kjoss.2014.26.4.349
Until now, wall-slab plate of steel plate concrete has been constructed by joint. But, the shear plate has problems in the workability as well as structural integrity. This study investigates the behavior and strength of rib stiffened SC wall-slab connection. Seven prototype specimens of wall-slab connections were fabricated and tested. the structural safety of the specimens was confirmed through the monotonic loading test. Based on the experimental observations, this study propose the strength formula of the joint was proposed. To enhance the reliability of the proposed strength formula, analytical verification was performed through inelastic finite element analysis. Effect of parameters, such as, load point, friction coefficient, on the joint strength was examined. The proposed formula yields a conservative value for most cases.
Seismic Performance of High Strength Steel(HSA800) Beam-to-Column Connections with Improved Horizontal Stiffener
Oh, Sang Hoon ; Park, Hae Yong ;
Journal of Korean Society of Steel Construction, volume 26, issue 4, 2014, Pages 361~373
DOI : 10.7781/kjoss.2014.26.4.361
As the height and beam span of buildings built in the construction market increase, increasingly higher quality is being required of the construction materials. In response to this trend, 800MPa tensile strength class steel was developed in domestic company. Currently, experiments applying flexural member, compression member, and connections are continuously conducted, but a design guideline for high strength steel has yet to be established. Among those construction materials, for the high strength steel beam-to-column connections, the evaluation of implementing ductile connections for the high strength steel beam-to-column connections is producing pessimistic results and the number of related researches is inadequate because of the high yield ratio, which is the characteristic of high strength steel. This study on implementation of ductile connections made of high strength steel was conducted using the connection detail as the variable, for the purpose of enhancing the deformation capacity of high strength steel beam-to-column connections. Cyclic loading test and nonlinear finite element analysis were conducted with full-scale mock-up connection models with the applied connection details. As a result, the structural performance of high-strength steel beam-to-column connection with presented detail was contented with demand of Special Moment Frames of KBC standard.