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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 15, Issue 6 - Dec 2003
Volume 15, Issue 5 - Oct 2003
Volume 15, Issue 4 - Aug 2003
Volume 15, Issue 3 - 00 2003
Volume 15, Issue 2 - 00 2003
Volume 15, Issue 1 - 00 2003
Selecting the target year
Optimum Life-Cycle Cost Design of Steel Bridges
Cho, Hyo-Nam ; Lee, Kwang-Min ; Kim, Jung-Ho ; Choi, Young-Min ; Bong, Youn-Jong ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 341~358
This paper proposed a general formulation of Life-Cycle Cost (LCC) models and LCC effective design system models of steel bridges suitable for practical implementation. An LCC model for the optimum design of steel bridges included initial cost and direct/indirect rehabilitation costs of a steel bridge as well as repair/replacement costs, loss of contents or fatality and injury losses, road user costs, and indirect socioeconomic losses. The new road user cost model and regional socioeconomic losses model were especially considered because of the traffic network. Illustrative design examples of an actual steel box girder and an orthotropic steel deck bridge were discussed to demonstrate the LCC effectiveness of the design of steel bridges. Based on the results of the numerical investigation, the LCC-effective optimum design of steel bridges based on the proposed LCC model was found to lead to a more rational, economical, and safer design compared with the initial cost-optimum design and the conventional code-based design.
Hysteretic Behavior of Compressive Braces upon Repeated Cyclic Loading Based on the Review of Existing Data
Lee, Kangmin ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 359~368
Design and detailing requirements of seismic provisions for Concentrically Braced Frames (CBF) were specified based on the premise that bracing members with large KL/r and low b/t have superior seismic performance. However, relatively few tests have been done to investigate the cyclic behavior of CBF. Therefore, the question lies on whether the compression member of CBF plays as significant a role as what has been typically assumed by design providers. In this paper, existing experimental data were reviewed to quantify the extent of hysteretic energy achieved by bracing members in past compression tests as well as the extent of degradation of the compression force given repeated cycling loading.
A Study on the Damage of Steel Square Tubular Columns under Cyclic Loading
Park, Yeon Soo ; Jeon, Dong Ho ; Suh, Byoung Chal ; Kim, Wook ; Choi, Dong Ho ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 369~378
This study proposed a damage index for steel members and examined a process where steel square tubular columns under cycle loading failed to meet the damage index. A nonlinear analysis was carried out and a damage process analyzed using a finite element program. Material properties and strain characteristics were obtained from material testing. The effect on the damage of members was analyzed according to varying kinds of steels and conditions of loading based on material testing results. According to strain characteristics and cumulative plastic strain of each variable, the effect of conditions of loading and kinds of steels on the damage could be estimated quantitatively.
Energy Dissipation Demand of Braces Using Non-linear Dynamic Analyses of X-Braced Frame
Lee, Kangmin ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 379~388
The response of single story buildings and other case studies were investigated to observe trends and develop a better understanding of the impact of some design parameters on the seismic response of Concentrically Braced Frames (CBF). While many parameters are known to influence the behavior of braced frames, the focus of this study was mostly on quantifying energy dissipation in compression and its effectiveness on seismic performance. Based on dynamic analyses of single story braced frame and case studies, a bracing member designed with bigger R and larger KL/r was found to result in lower normalized cumulative energy ratio in both cases.
Optimum Design of Composite Framed Structures Based Reliability Index
Jung, Young Chae ; Kim, Jong Gil ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 389~401
The purpose of this study is to develop an algorithm, which can be designed the optimal sections of the composite framed structures constituted with the beams and the columns consisted of H type of steel section and concrete considering the reliability index. The optimized problem or the composite framed structures is formulated with the objective function and the constraints taking the section sizes as the design variables. The objective functions are constituted by the total costs of constructions. Also, the constraints are derived by considering the reliability index of section stress and allowable stress. The algorithm optimized the section of the composite framed structures utilizes the SUMT method using the modified Newton-Raphson direction method. The optimizing algorithm developed in this study is applied to the numerical examples with respecting a one-bay, one-story composite framed structure and a one-bay five-story one for the practical utilization of design on the composite framed structures using the reliability indices
three and zero. In addition, their numerical results are compared and analyzed to examine the possibility of optimization the applicability, and the convergence this algorithm.
Bending Behaviour of Composite Slab Using a New-Shaped Steel Deck Plate and Expanded Metal
Kim, Myoung Mo ; Eom, Chul Hwan ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 403~412
The composite metal deck plate system has been widely used for office structures. Recently, however, the flat deck plate has been developed to apply the composite slab system to residential structures. Reduction in construction cost and time can be expected by using expanded metal instead of wire mesh as crack control reinforcements. This study proposed a composite slab system composed of a new-shaped steel deck plate and expanded metal. Twelve specimens were tested to evaluate the structural performance of the new composite slab system. The test results were summarized mainly in terms of maximum load carrying capacity and failure behaviors of each specimen.
A Study on Adaptation of Neural Network to Warren Truss Design
Shin, Dong Cheol ; Lee, Seung Chang ; Cho, Young Sang ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 413~422
Most engineers tend to rely on their intuition or existing data in formulating structural design or preliminary estimate of various conditions. Because of these variations, the artificial neural network is used as an alternative design model of the warren truss since it can handle uncertainty through the probability method. This research validated the approximate structural design model of the warren truss, with its proper parameter values of the neural network and design process falling within 10 percent torrence of the different designs that resulted between this model and the MIDAS program. The suggested model for the process was adapted for the truss design using the member section table, while time saving and efficiency are based on the allowed range of torrence.
Cyclic Local Buckling Behavior of Steel Members with Web Opening
Lee, EunTaik ; Ko, KaYeon ; Kang, JaeHoon ; Chang, KyoungHo ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 423~433
Many study have been performed to describe the elastic and inelastic behavior of H-shaped beams with web openings that generally concentrated on the monotonic loading condition and concentric web opening. The findings of the studies led Darwin to propose formulas for the design of beams with web openings considering local buckling. While the formulas are simple and useful in real situation, more studies arc needed on their cyclic loading condition. In this experimental study, 12 H-shaped beams with web openings under cyclic loading condition were investigated. The dimension criteria based on the formulas proposed by Darwin were examined. The suitability of existing design formulas and the effects of plastic hinges on beams with web openings and of local buckling around web openings on the beam strength under cyclic loading were also studied. This was done by observing their behavior with various dimensional openings, eccentric per cent, and stiffeners.
Development of a Tensile Force Measurement Device of Long Duration
Shin, Kyung Jae ; Hwang, Yun Ha ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 435~445
Tension member is one of the most important elements in tension structure. An economical and reliable measurement method of a member's tensile force has yet to be developed, however. Several conventional measurement methods have some disadvantages when used for long-term, on-site measurement. A new tension-force measurement device was proposed to resolve measuring problems. Its principle was to use the bending part of the device as an elastic spring. The lateral deformation of the bending part due to tensile force can be measured to monitor the tensile force. This device was inserted in the tension member like a turn-buckle. Lateral deformation may be measured in the field at any time for the purpose of maintaining structures. Finite element analysis was used to design the shape and parametric study. Six specimens were tested within the elastic range. The test result showed that the elastic behavior or the bending part was consistent with the analysis' results.
Nonlinear Analysis and Design of Rectangular Damper
Eom, Seung Hyeon ; Kim, Won Ki ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 447~456
In this study, the proper shape of dampers was determined when the outside frame formed a rectangle. The proper shape of dampers is rectangular, having the same ratio as the outside frame. The design was based on the impact energy dissipated by the seismic performance of the mainly rectangular dampers. This study sought to compare both strength and energy dissipation between nonlinear analysis data and experimental data through load-displacement curves. The use of the ANSYS FEM software was suggested to analyze the nonlinear behavior of rectangular dampers subjected to cyclic loading. The target of this study was to determine what shape was efficient for rectangular tensile brace dampers. The safety of the developed rectangular dampers was also checked for better fabrication.
Stability of Steel Frames with Weak Column-Strong Beam Considering P-Δ effect
Kim, Hee Dong ; Lee, Myung Jae ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 457~466
This study aimed to evaluate the stability of steel frames with weak column-strong beam and consider P-effect using the experimental approach. Towards this end, three specimens were tested under monotonic loading condition. Parameters of tests includes the stiffness of the column and the axial load ratio. Result showed that reduction in column stiffness promoted P- effect, which considerably influenced the frame's stability.
A Study on the strength evaluation for T-type Composite Beam
Kim, Sang Mo ; Kim, Kyu Suk ;
Journal of Korean Society of Steel Construction, volume 15, issue 4, 2003, Pages 467~474
Composite action can be achieved by providing shear connectors between the steel top flange and concrete topping. Composite sections are stiffer than the sum of the individual stiffness of slab and beam. They can therefore carry heavier loads or similar loads with appreciably smaller deflection. They are also less prone to transient vibration. In this study, T-type Steel Composite beam (TSC-beam) was developed and tested. The test results of TSC beam were compared with the theoretical results based on composite actions.