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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 11, Issue 6 - Dec 1999
Volume 11, Issue 5 - Oct 1999
Volume 11, Issue 4 - Aug 1999
Volume 11, Issue 3 - Jun 1999
Volume 11, Issue 2 - Apr 1999
Volume 11, Issue 1 - Feb 1999
Selecting the target year
Remaining Fatigue Life Evaluation of Steel Railroad Bridge
Kim, Sang Hyo ; Lee, Sang Woo ; Mha, Ho Seong ; Kim, Jong Hak ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 329~338
A systematic procedure to evaluate fatigue damages and to predict remaining fatigue lives is introduced for a steel railway bridge. Fatigue damages are evaluated by using the currently available fatigue damage theory. Fatigue lives with the condition of fatigue crack initiation are estimated by the probabilistic approach based on the reliability theory as well as the simplified procedure. A equivalent deterministic procedure is also suggested to assess the remaining fatigue life under various traffic conditions. Numerical simulations are used to assess dynamic stress histories with correction factors. Loading models are obtained from the passenger volume data. Train coincidences are also considered. Based on the results, the fatigue life is found to be underestimated by without considering the coincidence of trains on the bridge. The simplified method proposed in this study are found to yield approximately the same results as the systematic procedure.
A Study on the Fatigue Characteristics of Transverse Butt-Welded Joints containing Blowholes
Chang, Dong Il ; Kyung, Kab Soo ; Cho, Kwang Hyun ; Hong, Sung Wook ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 339~350
In this study, blowholes, a kind of solid defects, were intentionally introduced in transverse butt-welded joints which are widely used for the connection of main members in steel structures to evaluate the fatigue characteristics of these joints with blowholes according to the difference of the size and shape of blowholes, and a series of tests were performed. Static test results proved that the static strength of these joints with blowholes was not affected by their size and shape. From the fatigue test results on these joints with blowholes, the size and shape of blowholes inside the weld metals were strongly affected in fatigue strength, and we suggested the relationship between fatigue strength and their size and shape quantitatively. Also, Using the relationship of fatigue crack growth rate and stress intensity factor range, the fatigue life of transverse butt-welded joints with blowholes can be estimated properly.
Dynamic Characteristics of Cable-Stayed Anchorage considering Cracks at Bolt and Welding Connection
Kim, Chul Young ; Kim, Sung Bo ; Jung, Woo Tai ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 351~362
Damage detection methods which utilize the change in dynamic characteristics are very hard to apply to large civil structures since local damage hardly affects global dynamic characteristics. But, if there is a very important and critical member and we focus only on the local behavior of it, it would be possible to detect damage from the change in local dynamic characteristics, such as natural frequencies and mode shapes .In this study, the cable anchorage part of a cable-stayed bridge under construction is modeled and analyzed by commercial finite element program, ABAQUS. It has both welding and bolting connections with a cable and a stiffening plate, and has a possible high stress concentration portions in it. Several damage scenarios such as crack through the welding or crack through the bolting connection are examined. The result shows that the local natural frequencies of the damaged member decrease up to 16% compared with that of the undamaged member. It is concluded that there is quite a high feasibility that the damage of the cable anchorage can be detected by measuring local dynamic characteristics.
Analysis Models for Automatic Design of Orthotropic Steel Deck Bridges
Cho, Hyo Nam ; Chung, Jee Seung ; Min, Dae Hong ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 363~372
This study proposes useful analysis models for automatic design of orthotropic steel deck bridges. For the selection of the best or the most proper analysis model this paper presents various analysis models based on grillage model, which are then compared with each other in terms of reliability of analysis, computing time and effectiveness. Also the selected analysis models are compared with Pelikan-Esslinger method well-known for orthotropic steel deck bridge analysis. The effectiveness of proposed analysis models is demonstrated by means of a numerical example that is a three-span continuous (60m+80m+60m=200m) orthotropic steel-box girder bridge.
Analysis of Anisotropic Laminated Cylindrical Shells with Shear Deformation
Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 373~384
The shell structures with composite materials have the advantages in strength, corrosion resistance, and weight reduction. The objective of this study is to analyze anisotropic composite circular cylindrical shells with shear deformation theory. In applying numerical methods to solve differential equations of anisotropic shells, this paper use finite difference method. The accuracy of the numerical method can be improved by taking higher order of interval
to reduce error. This study compares the results of finite difference method with the results of ANSYS based on finite element method. Several numerical examples show the advantages of the stiffness increasement when the composite materials aroused. Therefore, it is expected that results of this study give various guides for change of the subtended angles, load cases, boundary conditions, and side-to-thickness ratio.
A Parametrical Study on the flexural strength of Concrete-Filled SHS Columns to Composite H-Beam Connections
Lee, Jong Seok ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 385~395
Square hollow section columns and H-section beams have recently been increasing1y used. Rigid column-beam connections cannot be made for the structural system and thus some measures to improve the rotational stiffness of connections should be developed. For this purpose, several types of connections. such as H-section beams connected to concrete-filled square hollow section columns, have been contrived and put to experiment. Since the experimental works are usually difficult and expensive. Particularly test of all the types of connections with similar behavior may not be feasible. Instead, the numerical analysis will be adopted predict the flexural stiffness of connections. In this work, FEM modeling techniques are examined and parametric analysis study has been carried out. The major parameters considered are concrete strength, thickness of steel column, magnitude and eccentricity of axial forces.
A Study on Fatigue Safety Estimation of Cross Frame of Suspension Bridge(I) - Estimation by Nominal Stress -
Kyung, Kab Soo ; Jeon, Jun Chang ; Su, Seok Ku ; Yong, Hwan Sun ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 397~407
In this paper, the fatigue safety in the suspension bridge is investigated by using nominal and variable stress, respectively. The technique on structural modeling and the fatigue evaluation using nominal stress are mainly dealt with in this paper. To make the finite element analysis model reflecting the actual structural behavior of the suspension bridge with cross frame, the parametric study is carried out. In this study, the influence of supporting condition. the difference of the results of 2- and 3-D analysis and the number of cross frames modelled in are considered. The nominal stress under the real traffic flow of the bridge is calculated by the combination of the stresses due to the unit DB-24 loading. The nominal stresses for details under consideration are compared with allowable stress ranges specified in the codes and the results are discussed.
Fatigue Crack Growth Analysis of Steel Deckplates Under Bending Stress
Choi, Jun Hyeok ; Kyung, Kab Soo ; Choi, Dong Ho ; Chang, Dong Il ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 409~416
The fatigue crack growth analysis based on the fracture mechanics is useful to the estimation of the fatigue life on welded structures under cyclic loading. The analysis procedure in fatigue crack growth under uniform axial loading is applicable to bending fatigue problem as well. The intent of the present study is to show the procedure for calculating the fatigue crack propagation lifetimes of deckplates under bending stress and to explain the crack growth rates for the two dimensional crack problems. It is shown that the fatigue crack grows at a decreasing rate and the fatigue life depends on the initial crack length and the crack shape. The numerically predicted crack growth agree with the experimental data.
Nonlinear Analysis of 3-D Steel Frames
Kim, Seung Eock ; Kim, Yo Suk ; Choi, Se Hyu ; Kim, Sung Mo ; Choi, Joon Ho ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 417~424
In this paper a nonlinear analysis of three-dimensional steel frames is developed. This analysis accounts for material and geometric nonlinearities. The material nonlinearity includes gradual yielding associated with flexural behaviors. The geometric nonlinearity includes the second-order effects associated with
effects. The material nonlinearity at the node is considered using the concept of P-M hinge consisting of many fibers. The geometric nonlinearity is considered by the use of stability function. The nonlinearity caused by shear and torsional interaction effects is neglected. The modified incremental displacement method is used as the solution technique. The load-displacements predicted by the proposed analysis compare well with those given by other approaches.
An Analytical Study on Semi-Rigid Connections of 6-Story Unbraced Steel Structures
Kim, Jin Hyoung ; Kang, Suk Bong ;
Journal of Korean Society of Steel Construction, volume 11, issue 4, 1999, Pages 425~433
Structural analysis and design of steel frames is usually conducted under the assumption that beam-to-column connections are either fixed or pinned. In reality, each connection possesses a certain rotational stiffness. In this study, structural analysis program is developed, which takes into account the nonlinear behavior of framed structures including flexibility of semi-rigid connections and member geometric nonlinearity. Effective semi-rigid connections for a 6-story unbraced steel frame are suggested and the effect of flexible connections on the behavior of the structure are studied.