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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 12, Issue 5 - Oct 2000
Volume 12, Issue 4 - Aug 2000
Volume 12, Issue 3 - Jun 2000
Volume 12, Issue 2 - Apr 2000
Volume 12, Issue 1 - Feb 2000
Volume 12, Issue 6 - 00 2000
Selecting the target year
An Experimental Study of the Fatigue Specimen for the Typical Structural Details of the Steel Bridge
Chung, Yeong Wha ; Jo, Jae Byung ; Bae, Doo Byong ; Jung, Kyoung Sup ; Woo, Sang Ik ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 463~473
This paper presents the results of the experimental and analytical investigation for the fatigue strength of welded details frequently used in steel bridges, especially for the details with relatively lower fatigue strength. The welded details included four kinds of welded details corresponding to the categories C, D, E and E' which represent the flange attachment details, web attachment details, transverse stiffeners and cover-plate details. Tensile fatigue tests were performed. The test results were compared with other available test results and the fatigue criteria of AASHTO, JSSC and Eurocode specifications. Generally, our test results were well agreed with other test results and satisfied with above-mentioned fatigue design provisions. However, it was found that transversely loaded weld-details showed lower fatigue strength than longitudinally loaded weld-details in transverse stiffener detail, and the test results of those details were not satisfied with AASHTO fatigue provisions. Examining the effect of length of gusset plate attachment details, welded details with longer attachment showed relatively lower fatigue strength, especially for the out-of-plane gusset plate details. It is recommended to perform additional fatigue tests with various loading and detail parameters and to establish the more detailed fatigue categories such as Eurocode or JSSC
Automated Optimum Design Program for Steel Box Girder Bridges
Cho, Hyo-Nam ; Chung, Jee-Sung ; Min, Dae-Hong ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 475~485
In this study, an automated optimum design program for steel box girder bridges has been developed for the optimum design of composite steel box girder bridges. The design constraints required for the optimum design of steel box girder bridges are based on the Korean standard bridge specification. Considering characteristics of steel box girder bridges, several approximation techniques, such as artificial constraint deletion, variable linking and stress reanalysis technique etc. are also introduced to enhance the efficiency of optimization. The developed program is mainly composed of major sub-system modules including structural analysis module using commercial structural analysis program such as RM-SPACEFRAME, optimum design module, pre-process module for friendly user input, and post-processor module for office automation. In addition, in order to demonstrate the efficiency and applicability of the developed optimum design program for steel box girder bridges, a few numerical examples are applied. Based on the results of the application, it may be stated that the automatic optimum design program developed in this study can be a prototype model for the developement of optimum design program for other type of bridge.
An Experimental Study on the Elasto-Plastic Behavior of High Strength Column to Beam Welded Connection
Kim, Jong Rak ; Kim, Sung Bae ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 487~494
This paper intends to propose design information with the result or comparing the deformation capacity with different panel stiffness specimens and estimating the plastic deformation capacity, toughness and strength of welded joint connection according to the different scallop types. The test results of the beam to column unit structure are as follow: the non-scalloped and the low stiffness panel specimen have more desirable result values than the scalloped and the high stiffness one in plastic deformation. Comparing the scallop types shows very unlikely tendency as follows, second cracking occurs at the very edge of scallop in the scalloped specimen otherwise cracking occurs bond area of welded beam flange in the non-scalloped one.
An Experimental Study on Characteristics of Wind Pressure on Long-Span Roof of the Kwangju World Cup Stadium
Park, Yeon Soo ; Kim, Yun Seok ; Park, Sun Joon ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 495~502
In this study, the wind tunnel test for Kwangju World Cup Stadium with long span roof was carried out and its results were considered in the two roofs: one is the case of one roof, and the other is the case of two roofs which are identical. In this experiment, a 1/400-scale model was used. As a result of measuring wind pressure in the case of one roof and then two, when two roofs are set up, wind load for structural frame decreases by 35%, compared to that of one roof. These results show that the current criteria for wind loadings, which specify that wind pressure on the roof depends only on the altitude, have limitations for adoption, and a wind tunnel test is essential to design.
Multi-Objective Fuzzy Optimization of Structures
Park, Choon-Wook ; Pyeon, Hae-Wan ; Kang, Moon-Myung ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 503~513
This study treats the criteria, considering the fuzziness occurred by optimization design. And we applied two weighting methods to show the relative importance of criteria. This study develops multi-objective optimization programs implementing plain stress analysis by FEM and discrete optimization design uniformaly. The developed program performs a sample design of 10-member steel truss. This study can carry over the multi-objective optimization based on total system fuzzy-genetic algorithms while performing the stress analysis and optimization design. Especially, when general optimization with unreliable constraints is cannot be solve this study can make optimization design closed to realistic with fuzzy theory.
The size and shape optimization of plane trusses using the multi-levels method
Pyeon, Hae-Wan ; Oh, Kyu-Rak ; Kang, Moon-Myung ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 515~525
The purpose of this paper was to develop size & shape optimization programming algorithm of plane trusses. The optimum techniques applied in this study were extended penalty method of Sequential Unconstrained Minimization Techniques(SUMT) and direct search method with multi-variables proposed by Hooke & Jeeves. Upper mentioned two methods were used iteratively at each level of size and shape optimization routines. The design variables of size optimization were circular steel tube(structural member) diameter and thickness, those of shape optimization were joint coordinates, and the objective function was represented as total weight of truss. During the optimum design, two level procedures of size and shape optimization were interacted iteratively until the final optimum values were attained. At the previous studies about shape optimization of truss, the member sectional areas and coordinates were applied as design variables. So that they could not apply the buckling effect of compression member. In this paper, actual sizes of member and nodal coordinates are used as design variables to consider the buckling effect of compression member properly.
Elastic Analysis of Steel Frame with Semi-rigid Connections using the Log Model
Lee, Sang Sup ; Moon, Tae Sup ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 527~535
Accurate determination of the relative restraint of beam-to-column connections is important for both the strength and the serviceability of structural frames. But steel frame analysis is carried out under the assumption that the connections are either fixed or pinned. Overestimating the connection restraint can result in underestimating lateral sway and underestimating the connection restraint can lead to underestimating forces developed in the beams and columns. This implies that the exact stiffness of connections as well as the geometric effects should be considered in the frame analysis and the overall behavior of connections could be described adequately. Therefore, the stiffness matrix which is able to consider the moment-rotation of connection was derived previously and the modified exponential model, power model and the proposed log model are adopted for modeling the semi-rigid connections. The main purpose of this study is to examine the feasibility of the derived stiffness matrix and to show the validity of log model proposed.
Analytical Study on Ultimate Design Method of Tube Flange Joints with the Rib Plate Using the High Strength Bolt
Kim, Seong Eun ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 537~547
The tube flange joint often used in the field is a kind of tensional joint method using the high strength bolts. Transferring stress is conducted by high axial pressure between each part of material that is produced by twisting the high strength bolts. And historical characteristics of the flange joint have not been studied sufficiently and it is difficult to say that the design method is established definitely. Therefore new method using ultimate strength is need to be suggested to solve there problems in using flange joint. The purposes in this study are to gain the data base for establishing design method of joint in the form like figure1 and survey whether the joint of tube flange with non-equal diameter can be designed or not in the form like rib or ring.
A Study on the Reinforcement of Steel Composite Beam Using the External Post-Tensioning Method
Park, Yong-Gul ; Park, Young-Hoon ; Lee, Seung-Yong ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 549~558
In strengthening structure, the external post-tensioning method which secure clearness in the structure analysis process is adopted to bridges as well as architecture structure. In this study, to investigate the behavior of composite beam in the process of post-tensioning, the amount of prestress force loss, the amount of prestressed compression stress at the lower flange and the behavior of lower flange connected with anchorage are analyzed by comparing the results of finite element analysis with the measured results of installed strain gauges. After finishing the post-tensioning, the strengthening effect of external post-tensioning method is analyzed by static loading test. It is also investigated that the strengthening effect of shear section in the harped external post-tensioning specimens.
Analytical Modeling of Seismic Steel Moment Connections Reinforced with Welded Straight Haunch
Lee, Cheol-Ho ; Yoon, Tae-Ho ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 559~568
This paper describes new analytical modeling for steel moment connections with welded straight haunch. Among a variety of new details for seismic steel moment connections proposed after the 1994 Northridge and the 1995 Hyogo-Ken Nanbu earthquake, one viable solution was to strengthen the connection by adding a triangular haunch on the bottom side of the beam. However, a simpler design has been called for because of the increased labor associated with fitting the triangular haunch. Adding a straight haunch is one alternative. But a mathematical model that forms the design basis is not available. A simplified analytical model that considers the force interaction and deformation compatibility between the beam and haunch is developed in this study. The proposed modeling predicted quite reasonably the interaction forces at the beam-haunch interface and the flexural stresses in the beam and haunch flange groove welds.
Multi-Level Optimization of Framed Structures Using Automatic Differentiation
Cho, Hyo-Nam ; Chung, Jee-Sung ; Min, Dae-Hong ; Lee, Kwang-Min ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 569~579
An improved multi-level (IML) optimization algorithm using automatic differentiation (AD) of framed structures is proposed in this paper. For the efficiency of the proposed algorithm, multi-level optimization techniques using a decomposition method that separates both system-level and element-level optimizations, that utilizes and an artificial constraint deletion technique, are incorporated in the algorithm. And also to save the numerical efforts, an efficient reanalysis technique through approximated structural responses such as moments and frequencies with respect to intermediate variables is proposed in the paper. Sensitivity analysis of dynamic structural response is executed by AD that is a powerful technique for computing complex or implicit derivatives accurately and efficiently with minimal human effort. The efficiency and robustness of the IML algorithm, compared with a plain multi-level (PML) algorithm, is successfully demonstrated in the numerical examples.
Vertical Seismic Vibration of Suspension Bridges
Choi, Jee-Hoon ; Lee, Jon-Ja ; Kim, Su-Bo ; Lee, Yong-Jae ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 581~593
In this study, vertical dynamic analyses on the suspension bridges under seismic load are developed. Time domain analysis, random vibration analysis, and spectral analysis are formulated theoretically. The random nitration analysis is checked by numerical integration and the mathematical integration with correlation coefficient which include CQC and SRSS method in the conditions of white noise and filtered white noise. Beam, truss and frame elements are used in order to model the suspension bridge. Geometric stiffness due to dead load is considered for cable and tower.
An Experimental Study on the Ultimate Strength and Deformation Capacity of Composite Beams with Eccentric Web Openings
Choi, San Ho ; Seo, Seong Yeon ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 595~604
Web openings of large beams provide space for wiring, piping, and duct work to provide for proper drainage, pipes and duct must be slightly sloped with the attendant result that all web openings can not be centered on the centroidal axes of the beams. Test specimens are made for opening-depth to beam-depth ratio of 0.5 and for eccentricities of the opening center line of 10% from middepth of the beam because of the proximity of the opening edge to the flange. In this paper, available test results and theories relating to the strength of composite beams having eccentric rectangular openings are surveyed and experiments were carried out to examine the structural behaviors. In all the tests in this paper good agreement is demonstrated with maximum loads measured in tests, and observed failure modes Furthermore, compared with analytical values and experimental values of interaction diagram between moment and shear capacity were safed as it is scattered with outer part of the analytical values.
Prediction of Dynamic Response of Structures Using CMAC
Kim, Dong Hyawn ; Kim, Hyon Taek ; Lee, In Won ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 605~615
Cerebellar model articulation controller (CMAC) is introduced and used for the identification of structural dynamic model. CMAC has fascinating features in learning speed. It can learn structural response within a few seconds. Therefore it is suitable for the real time identification structures. Real time identification is required in the control of structure which may be damaged or undergo severe change in mechanical properties due to shrinkage or relaxation etc. In numerical examples, it is shown that CMAC trained with the dynamic response of three-story building can predict responses under not trained earthquakes with allowable error. Finally, CMAC has great potential in structural and control engineering.
An Effect of TIG Dressing on Fatigue Characteristics of Non Load-Carrying Fillet Welded Joints
Jung, Young Hwa ; Kyung, Kab Soo ; Hong, Sung Wook ; Kim, Ik Gyeom ; Nam, Wang Hyone ;
Journal of Korean Society of Steel Construction, volume 12, issue 5, 2000, Pages 617~628
In this study, the 4-point bending test has been performed in order to estimate the effect of TIG-dressing on fatigue strength and fatigue characteristics quantitatively for non load-carrying fillet welded joints subjected to pure bending. As a result of fatigue tests, fatigue strength of as-welded specimens has been satisfied the grade of fatigue strength prescribed in specifications of domestics and AASHTO & JSSC, and fatigue strength at
of TIG-dressing specimens has been increased compared with as-welded specimens. As the result of beachmark tests, fatigue cracks have been occurred at several points, where the radius of curvature and flank angle in the weld bead toes are low, and grown as semi-elliptical cracks, then approached to fracture. As a result of finite element analysis, stress concentration factor in weld bead toes has been closely related to the flank angel and radius of curvature, and between these, the radius of curvature has more largely affected in stress concentration factor than flank angle. As a result of fracture mechanics approaches, the crack correction factor of test specimens has been largely affected on stress gradient correction factor in case a/t is below 0.4. From the relations between stress intensity factor range estimated from FEM analysis and fatigue crack growth rate, fatigue life has been correctly calculated.