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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 28, Issue 3 - Jun 2016
Volume 28, Issue 2 - Apr 2016
Volume 28, Issue 1 - Feb 2016
Selecting the target year
Static Shear Strength of Cast-in Anchors with Stirrup Reinforcement
Park, Yong Myung ; Jo, Sung Hoon ; Kim, Tae Hyung ; Kang, Choong Hyun ; Kim, Jae Bong ;
Journal of Korean Society of Steel Construction, volume 28, issue 1, 2016, Pages 1~12
DOI : 10.7781/kjoss.2016.28.1.001
An experimental study was conducted to evaluate the static shear strength of stirrup-reinforced cast-in anchors. The test parameters considered herein are an existence of front bearing bar and concrete crack. M36 anchor was used with an edge distance of 180mm. HD-10 bars were used for all reinforcing bars and the stirrups were placed with 100mm spacing. The shear resistance increased by 16% when the front bearing bar was installed. Meanwhile, the resistance reduced only 5% in the cracked concrete compared with the uncracked concrete. The test results showed that ACI 318 and ETAG 001 specifications could estimate the shear strength of stirrup-reinforced anchors conservatively and a rational method was proposed. A consideration on the fracture strength of stirrup-reinforced anchor is also given.
Life Cycle Assessments and Effect Factors in the Planning Stage of Steel Bridge
Jeon, Min Yeong ; Kyung, Kab Soo ; Lee, Sung Jin ; Ryu, Seong Jin ;
Journal of Korean Society of Steel Construction, volume 28, issue 1, 2016, Pages 13~22
DOI : 10.7781/kjoss.2016.28.1.013
Recently, interest for environmental pollution in various fields is on the increase, and the researches on the life cycle assessment of environmental performance assessment method for calculating the environmental loads are currently most performed. It is expected to have a significant influence on the environment, since SOC infrastructures are go through a variety of materials, manufacturing process, however it is judged that researches and measures for environmental pollution is insufficient. In this study, we build the data for 204 of steel bridge designed after 2000 year, and the 100 of bridge which were selected to from obtained results were calculated the environmental loads at the planning stage based on the life cycle assessment. In addition, standard classification systems in work type for steel bridges were established. Based on this, the basic design data and input materials for the bridges are applied to the LCI DB, and the environmental load for required material is evaluated and is shown as Eco-point. Environmental loads obtained from this study, it is judged that can be utilized as a basic data for the process of the life cycle assessment in future steel bridge design.
Analysis Study on Fire Performance with Internal Anchored Concrete Filled Steel Tube Columns According to Percent of Steel-Fibers
Kim, Sun Hee ; Yom, Kong Soo ; Kim, Yong Hwan ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 28, issue 1, 2016, Pages 23~34
DOI : 10.7781/kjoss.2016.28.1.023
Concrete filled steel tube system has two major advantages. First, the confinement effect of steel tube improves the compressive strength of concrete. Second, the load capacity and deformation capacity of members are improved because concrete restrains local buckling of steel tube. It does, however, involve workability problem of using stud bolts or anchor bolts to provide composite effect for larger cross-sections. While the ribs inside the columns are desirable in terms of compressive behavior, they cause the deterioration in load capacity upon in-plane deformation resulting from thermal deformation. Since the ribs are directly connected with the concrete, the deformation of the ribs accelerates concrete cracking. Thus, it is required to improve the toughness of the concrete to resist the deformation of the ribs. Welding built-up tubular square columns can secure safety in terms of fire resistance if the problem are solved. This study focuses on mixing steel fiber in the concrete to improve the ductility and toughness of the columns. In order to evaluate fire resistance performance, loaded heating test was conducted with 8 specimens. The behavior and thermal deformation capacity of the specimens were analyzed for major variables including load ratio. The reliability of heat transfer and thermal stress analysis model was verified through the comparison of the results between the test and previous study.
Analysis of Two-Span Structures Constructed by Incremental Launching Method
Kim, Sung Hoon ; Kim, Bu Kyu ; Choi, Jun Hyeok ;
Journal of Korean Society of Steel Construction, volume 28, issue 1, 2016, Pages 35~42
DOI : 10.7781/kjoss.2016.28.1.035
This paper presents the structural analysis of two-span structures constructed by incremental launching method to traverse the existing facilities. The structure with a relatively short launching span can not be secure the structural stability caused by excessive deflection and overturning prior to reaching the maximum strength, because the length of the other span is different or the rear structure is not continuous. In order to estimate the stability of the construction stages of deflection and the overturning, the structural analysis was carried out. The parameters of the analysis is launching span ratio of the launching nose and the upper structure, weight ratio and so on. From the analysis result, the effects of parameters were investigated and a deflection formula of the launching nose and the condition of the overturning of structure were proposed.
Numerical Study on Required Stiffness of Longitudinal Stiffener in Plate Girders
Lee, Kun Joon ; Park, Yong Myung ; Kim, Byeong Jun ; Park, Chan Hee ;
Journal of Korean Society of Steel Construction, volume 28, issue 1, 2016, Pages 43~52
DOI : 10.7781/kjoss.2016.28.1.043
A numerical study on required stiffness of the longitudinal stiffener in the webs stiffened with flat plate at one-side of the web was conducted. The longitudinal stiffeners are commonly placed around 0.2D, i.e., 1/5 the web depth due to fabrication convenience although most plate girders for bridges are unsymmetric section. Considering asymmetry of section, aspect ratio of web and the rigidity ratio of longitudinal stiffener(
), eigenvalue analysis were performed to evaluate the buckling strength for the webs with a stiffener located at 0.16D~0.24D. Based on the parametric analysis, the required stiffness of the longitudinal stiffener to satisfy the buckling strength specified in AASHTO LRFD specifications was presented.
Development of Connection Details for a Double Split Tee Connection Without a Shear Tab
Yang, Jae Guen ; Kim, Yong Boem ;
Journal of Korean Society of Steel Construction, volume 28, issue 1, 2016, Pages 53~64
DOI : 10.7781/kjoss.2016.28.1.053
The double split tee connection, a type of beam-to-column moment connection, exhibits different behavioral characteristics according to changes in the thickness of the T-stub flange, the gauge distance of the high-strength bolt, and the number and diameter of high-strength bolts. In general, the double split tee connection is idealized and designed so that a T-stub fastened to the top and bottom supports a flexural moment, and a shear tab supports a shear force. However, if the double split tee connection is applied to low-and medium-rise steel structures, the size of the beam member becomes small, and thus the shear tab cannot be bolted to the web of a beam. In this regard, this study was conducted to propose connection details to ensure that the double split tee connection with a geometric shape can display sufficient shear resisting capacity. To this end, experiments were conducted using full-scale specimens for the double split tee connection.