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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 25, Issue 6 - Dec 2013
Volume 25, Issue 5 - Oct 2013
Volume 25, Issue 4 - Aug 2013
Volume 25, Issue 3 - Jun 2013
Volume 25, Issue 2 - Apr 2013
Volume 25, Issue 1 - Feb 2013
Selecting the target year
Study on the Scientific Functional Investigation of Steel Space Truss Structures by using Technology Tree Methodology
Lee, Dong Kyu ; Kim, Do Hwan ; Kim, Jin Ho ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 321~333
DOI : 10.7781/kjoss.2013.25.4.321
This study presents a practice of a scientific methodology, i.e., technology tree to describe hierarchies of functions and technologies of research projects. In this study functional developments of a well-known steel space frame truss are dealt with for an application of the technology tree process to execute the maintenance of road tunnels without blocking vehicles. It is verified that established results of technology tree process can be linked to a proof process of revealed functions and component technologies such as reference works and structural analyses. In the future the technology tree methodology can be extendedly used for an effective tool setting up research plans and developing integrated technologies of a specific item such as a steel structure.
Evaluation of Impact Factor in Composite Cable-Stayed Bridges under Reliability-based Live Load Model
Park, Jae Bong ; Park, Yong Myung ; Kim, Dong Hyun ; Lee, Jong Han ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 335~346
DOI : 10.7781/kjoss.2013.25.4.335
AASHTO LRFD and Korean Bridge Design Code (Limit State Design) specify to consider Truck and Lane load simultaneously determined from reliability-based live load model, and impact shall be applied to the truck load while it shall not be applied to the lane load. In this paper, vehicle-bridge interaction analysis under moving truck and lane loads were performed to estimate impact factor of the cables and girders for the selected multi-cable-stayed composite bridges with 230m, 400m and 540m main span. A 6-d.o.f. vehicle was used for truck load and a series of single-axle vehicles was applied to simulate equivalent lane load. The effect of damping ratio on the impact factor was estimated and then the essential parameters to impact factor, i.e., road surface roughness and vehicle speed were considered. The road surface roughness was randomly generated based on ISO 8608 and it was applied to the truck load only in the vehicle-bridge interaction analysis. The impact factors evaluated from dynamic interaction analysis were also compared with those by the influence line method that is currently used in design practice to estimate impact factor in cable-stayed bridge.
A Study on the Load Carrying Capacity and Deformation Capacity of the Internal Anchors Welded Cold Formed Concrete Filled Columns
Kim, Sun Hee ; Yom, Kong Soo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 347~357
DOI : 10.7781/kjoss.2013.25.4.347
Recently, In recognition of outstanding structural performance the use of Concrete Filled steel Tube(CFT) columns has been increased. Research is ongoing that effective use of cross-sectional because steel strength development and rising prices. In this Lab, suggests new shape by Thin steel plates bent to be L-channel welded to form square steel tube to maximize efficiency of the cross section. In addition, since the rib placed at the center of the tube width acts as an anchor; higher load capacity of buckling is acceptable. we have developed New shape welded built-up square tube for broader usability which were bent to be L-shaped and thin Plate each unit member were welded. In order to apply the new shape built-up square columns, we predicted structure behavior, stress distribution with parameter Width thickness ratio. The experimental results presented in standards and even exceed the b/t of the rib anchors installed in the role due to exert enough strength and deformation to improve performance was favorable.
A Simplified Analysis Method of GFRP Composites Deck
Son, Byung Jik ; Ji, Hyo Seon ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 359~368
DOI : 10.7781/kjoss.2013.25.4.359
This paper presents a simplified analysis method using the elastic equivalent modelling not using the global finite element modelling of deck for the basic design GFRP composites deck with cellular tubes or sandwich structural type. In order to verify the validation of the simplified method ANSYS software package is used and compared the results analyzed on the global finite element modelling and the elastic equivalent modelling. And the laboratory testing by 4-point bending is conducted to compare the results based on the simplified analysis method proposed in this paper. The comparison of the results based on the analysis and the testing are discussed. It is found that the presented simplified analysis is applicable to the use in the basic design GFRP composite deck.
Improvement in Long-term Behavior Estimation of Prestressed Composite Girders for Various Construction Sequences using Parametric Study
Bae, Doobyong ; Oh, Chang Kook ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 369~377
DOI : 10.7781/kjoss.2013.25.4.369
The age-adjusted effective modulus method has been known to provide more precise assessment than the traditional Yassumi method for long-term behavior estimation of prestressed composite girders. The age-adjusted effective modulus method, however, involves complicated calculation, thereby making the Yassumi method more prevalent in actual design. This study presents rational approaches to revise creep coefficients for the Yassumi method by using parametric study results obtained from the age-adjusted effective modulus method.
Fire Resistance of U-shape Hybrid Composite Beam
Kim, Sung Bae ; Kim, Sang Seup ; Ryu, Deog Su ; Choi, Seng Kwan ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 379~388
DOI : 10.7781/kjoss.2013.25.4.379
This paper aims to experimentally investigate the fire resistance of U-shaped hybrid composite beams protected by spay and paint insulations. Subjected to two and three hours of the Standard ISO fire, the flexural performance of 4.4m beams with/without imposed loadings was examined with respect to failure criteria such as deflection and deflection rate of the mid-span and temperatures measured in the steel section. The results demonstrated that the proposed configuration of the composite beam is able to achieve a very competitive 3-hour fire resistance rating in economical aspects.
Review of Structural Design Provisions of Rectangular Concrete Filled Tubular Columns
Lee, Cheol Ho ; Kang, Ki Yong ; Kim, Sung Yong ; Koo, Cheol Hoe ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 389~398
DOI : 10.7781/kjoss.2013.25.4.389
The structural provisions of rectangular CFT (concrete-filled tubular) columns in the 2005/2010 AISC Specification, ACI 318-08, and EC4 were comparatively analyzed as a preliminary study for establishing the unified standards for composite structures. The provisions analyzed included those related to the nominal strength, the effect of confinement, plate slenderness, effective flexural stiffness, and the material strength limitations. Small or large difference can be found among the provisions of AISC, ACI, and EC4. Generally, the 2010 AISC Specification provides the revised provisions which reflect up-to-date test results and tries to minimize the conflict with the ACI provisions. For example, the 2010 AISC Specification introduced a more finely divided plate slenderness limits for CFT columns. In seismic applications, the plate slenderness limits required for highly and moderately ductile CFT columns were separately defined. However, the upper cap limitations on material strengths in both the AISC and EC4 provisions are too restrictive and need to be relaxed considering the high-strength material test database currently available. This study found that no provisions reviewed in this paper provide a generally satisfactory method for predicting the P-M interaction strength of CFT columns under various material combinations. It is also emphasized that a practical constitutive model, which can reasonably reflect the stress-strain characteristics of confined concrete of rectangular CFT columns, is urgently needed for a reliable prediction of the P-M interaction strength.
Seismic Response of Spatial Structure Subjected to Multi-Support Earthquake Load
Kim, Gee Cheol ; Kang, Joo Won ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 399~407
DOI : 10.7781/kjoss.2013.25.4.399
Spatial structures have the different dynamic characteristics from general rahmen structures. Therefore, it is necessary to accurately analyze dynamic characteristics and seismic response for seismic design of spatial structure. Keel arch structure is used as an example structure because it has primary characteristics of spatial structures. In case of spatial structures with different ground condition and time lag, multiple support excitation may be subjected to supports of a keel arch structure. In this study, the response of the keel arch structure under multiple support excitation and with time lag are analyzed by means of the pseudo excitation method. Pseudo excitation method shows that the structural response is divided into two parts, ground displacement and structural dynamic response due to ground motion excitation. It is known that the seismic responses of spatial structure under multiple support excitation are different from those of spatial structure under simple excitation. And the seismic response of spatial structure with time lag are different from those of spatial structure without time lag. Therefore, it has to be necessary to analyze the seismic response of spatial structure under multiple support excitation and time lag because the spatial structure supports may be different and very long span. It is shown that the seismic response of spatial structure under multiple support seismic excitation are different from those of spatial structure under unique excitation.
Prediction Models for the Prying Action Force and Contact Force of a T-stub Fastened by High-Strength Bolts
Yang, Jae Guen ; Baek, Min Chang ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 409~419
DOI : 10.7781/kjoss.2013.25.4.409
A T-stub connection with high-strength bolts under tensile force is affected by prying action force and the contact force, among others, between members. If a design equation that does not consider such prying action force and contact force between members is not proposed, the T-stub under tensile force is liable to be fractured under the strength lower than the estimated design strength. To prevent it, many studies have proposed contact force estimation equations between members as well as the prying action force of the T-stub connection with high-strength bolts. However, no design equations based on such research have been proposed in South Korea. Therefore, this study aims to propose an estimation model for more accurate prying action force and contact force, and improve on previously proposed estimation models by implementing the three-dimensional, nonlinear finite element analysis. Throughout the results of three-dimensional, nonlinear finite element analysis, the prediction model proposed in this research for the prying action force and contact force of a T-stub provided much more accurate estimation than that of a existing prediction model previously suggested.
Analysis of Lateral Behavior of Offshore Wind Turbine Monopile Foundation in Sandy Soil
Jang, Hwa Sup ; Kim, Ho Sun ; Kwak, Yeon Min ; Park, Jae Hyun ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 421~430
DOI : 10.7781/kjoss.2013.25.4.421
To predict behaviors of offshore wind turbines which are highly laterally loaded structures and to design them rationally, evaluating the soil-foundation interaction is important. Nowadays, there are many soil modeling methods for structural analysis of general structures subjected to vertical loads, but using the methods without any consideration for design of a monopile foundation is eschewed because it might cause wrong structural design due to the deferent loading state. In this paper, we identify the differences of the member forces and displacements by design methods. The results show that fixed end method is barely suitable for monopile design in terms of checking the serviceability because it underestimate the lateral displacement. Fixed end method and stiffness matrix method underestimate the member forces, whereas virtual fixed end method overestimates them. The results of p-y curve method and coefficient of subgrade reaction method are similar to the results of 3D soil modeling method, and 2D soil modeling method overestimates the displacement and member forces as compared with other methods.
Tensile Testing of Groove Welded Joints Joining Thick-HSA800 Plates
Lee, Cheol Ho ; Kim, Dae Kyung ; Han, Kyu Hong ; Park, Chang Hee ; Kim, Jin Ho ; Lee, Seung Eun ; Kim, Do Hwan ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 431~440
DOI : 10.7781/kjoss.2013.25.4.431
In this study, a standard tensile welded-joint test was conducted to select a welding electrode suitable for recently developed HSA800 steel. Two welding electrodes were available at the time of this study; one was GMAW-based and the other FCAW-based. The tensile test specimens were fabricated by joining 60mm-thick HSA800 plates according to the AWS-prequalified groove welded joint details. Specimens which violate the standard root opening distance (ROD) were also included to see if poor construction tolerance could be accommodated. During fabrication, serious concerns about the welding efficiency of the GMAW-based product were raised by a certified welder. Both welding electrodes showed satisfactory and similar performance from welded joint strength perspective. But groove welded joints made by using the FCAW-based rod consistently showed more ductile and stable behavior. The AISC provisions for PJP joint strength were shown to be very conservative under direct tensile loading. Violating the AWS prequalified ROD by 100% apparently passed the strength criteria, but unusual crater-like fracture surface was observed.
Damage Detection in Truss Structures using Anti-Optimization
Lee, Seung Hye ; Lee, Jae Hong ;
Journal of Korean Society of Steel Construction, volume 25, issue 4, 2013, Pages 441~449
DOI : 10.7781/kjoss.2013.25.4.441
Damaged structures change the value of natural properties. The purpose of this study is to detect damage using the difference of natural properties between the healthy state and the damaged state. Anti-optimization method is used to find the conditions that maximize the difference in characteristics between the two contrasting models. In this paper, a algorithm for finding the loading conditions which can maximize the difference of strain energy between the healthy state and the damaged state of truss structures is developed. Numerical examples show that the proposed method is accurate and efficient for truss structures.