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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
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Equivalent Axial Load Design Method of Rolled H-Shape Steel Beam-Columns Based on Limit State Design Code
Lee, Cheol-Ho ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 549~549
Equivalent axial load method (EALM) converts the more "complex" steel beam-column design into the "simple" problem of designing an axially loaded column and significantly reduces the computation time for the design of steel beam-columns. But this method has not been available in domestic steel design practice. EALM was developed in this study based on the newly adopted limit state design code. Column load tables essential for the efficient implementation of EALM were also proposed for typical rolled H shape beam-column sections and their usage was illustrated through selected design examples. The results of this study are directly usable for both practical design and education.
Stress Concentration of Longitudinal Rib to Deck Plate Welded Joints in Orthotropic Steel Decks
Choi, Dong-Ho ; Kim, Do-Hwan ; Choi, Jun-Hyeok ; Chang, Dong-Il ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 559~559
Orthotropic steel decks are potentially liable to have fatigue cracks in welded joints due to weld defects, residual stresses, and in-plane or out-of-plane stresses. In particular the cracks propagated through deck plate in longitudinal rib to deck plate joints occur at weld toe and weld root due to stress concentrations caused by the bending stress perpendicular to the bridge axis. Numerical parametric studies are performed to show the influence of the parameters on the stress concentration at the connection between longitudinal rib and deck plate for three load cases. The parameters include root gap, weld penetration depth, toe radius, and toe angle. Numerical results show that the local stresses are affected by the existence of root gap and at least 75% weld penetration of rib thickness and 2mm toe radius are suitable for the joints. The stress at the toe on the rib is affected by root gap size and weld penetration depth. Toe radius is the most effective parameter to reduce the stress concentration or both root and toe on the deck plate.
Stringer-to-Cross Beam Connections Behavior of Steel Box Girder Bridge
Lee, Hak-Eun ; Kim, Kee-Dong ; Gil, Heung-Bae ; Yi, Jong-Won ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 571~571
The stringer of a steel box girder bridge, which connected to the cross-beams, is a secondary member used to prevent unequal settlements between the girders and excessive deflections of the concrete deck. Since the cross-section and connections of stringers are usually determined for simple beam action neglecting the effects of concrete slabs, stringers are usually over-designed. The effects of concrete slabs on the behavior of stringer connections were examined by the experiments and analyses for various stringer-to-cross beam connections. The concrete slab had better effects on the strength and rotational stiffness of stringer-to-cross beam connections than the bolt connections of the top and bottom flanges, and significantly increased the strength and rotational stiffness of stringer connections. If the slip connections is prevented under the factored loads, even the most simple hinge connections, which are non-compositely bolt-connected to web only, performed similarly to rigid connections.
A Study on the Ultimate Strength on the Effect of Washer and Sizes of Bolt Holes of High Strength Bolted Joint in Cold-Formed Steel
Choi, Soon-Ju ; Choi, Mun-Sik ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 583~583
The purpose of this paper is to suggest pertinent data necessary for the design of a bolt connection in cold-formed steel structures. We carried out many experiments which have variables. for example, various size of bolt hole. connection with washer or without washer. We compared experimental results with AISI(1989) conditions and tried to verify the validity of current design criteria on the connection of cold-formed steel. We found that the failure shapes of bolt connection and the ratio of bolt diameter to edge distance ratio are the most important factors on the ultimate strength of the connection. We concluded through these results that the design criteria, which should use washer if the bolt hole is oversized, is reasonable.
A Study on the Stabilizing Process of Unstable Structures by Dynamic Relaxation Method
Han, Sang-Eul ; Lee, Kyoung-Su ; Lee, Sang-Jin ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 591~591
In this paper the stabilizing process of unstable structures by using dynamic relaxation method is presented. The process of installing the unstable structures by introducing the prestress is called stabilizing process. The unstable structures such as cable, pneumatic structures or cable domes initially behaves to be unstable state because of having no initial bending stiffness. The dynamic relaxation method is the energy minimization technique that searches the static equilibrium state by simple vector iteration method. In the dynamic relaxation method the tangent stiffness matrix of structure does not need to be assembled to analyze the stabilizing process during each iteration. Thus, computational effort and time can be reduced. The finite difference integration technique is used to integrate the dynamic equilibrium equation for static equilibrium state. Several numerical examples to confirm the efficiency and applicability of dynamic relaxation method.
Advanced Analysis Accounting for Semi-Rigid Composite Beam Effect
Kim, Yo-Suk ; Kim, Seung-Eock ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 603~603
In this paper, an advanced analysis accounting for composite beam effects is developed. The moment-rotation relationship of semi-rigid composite connections is modeled by power model. The ultimate moment and initial rotational stiffness are derived from assumed failure mechanism of the semi-rigid composite connection. The shape parameter is determined by curve-fitting. Plastic moment, modified yield stress and modified young's modulus of the composite beam are calculated according to the AISC-LRFD specification. Efficient ways assessing nonlinear inelastic behavior of steel frames are outlined. A case study shows that the load carrying capacity of a semi-rigid composite beam is larger by about 22% than that of the bare steel beam. The Proposed method is practical because it eliminates the separate member capacity check after analysis. It is an advanced design technique since it can evaluate the strength of a structural system.
Strength and Rotational Behavior of Semi-Rigid Composite Connections
Ahn, Sang-Wook ; Lee, Seung-Joon ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 615~615
Strength and rotational behavior of semi-rigid composite connections under cyclic loadings are investigated experimentally and analytically in this study. The purpose of this study is to investigate the moment-rotation characteristics of semi-rigid composite connections and to develop an analytical method to model the behavior of the semi-rigid composite connections for the practical use. Four connection specimens were fabricated and tested under cyclic loadings. The moment-rotation curves at the beam connections to columns were mainly obtained. An analytical method to determine the initial stiffness and strength of the semi-rigid connections is proposed. Comparison of the analytical results with the experimental results is made. The moment-rotation characteristics of the semi-rigid connections may be modelled to be bilinear.
Modified Dynamic Inelastic Analysis of Steel Structure Considering Changes of Dynamic Characteristics
Ju, Young-Kyu ; Kim, Sang-Dae ; Hong, Won-Kee ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 627~627
In conventional pushover analysis, the distribution of lateral forces applied to the structure to find both the mechanism and ultimate capacity of structures is assumed to be triangular. However, as the plastic hinges form in the structure, the constant distribution of lateral forces cannot be used no longer due to the change of dynamic characteristics. In this paper, MOdified Dynamic Inelastic Analysis (MODIA) which can account for the dynamic inelastic behavior based on the variation of lateral loads is presented. As the structure enters into inelastic range. the distribution of lateral forces is changed according to the mode shapes of structure. The proposed method is verified by comparing the results with those of DRAIN. A good correlation between the two technique was obtained.
The Beam-Column Strength of Singly Symmetric Cold-formed Steel Members
Ko, Sang-Ki ; Lee, Myung-Jae ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 637~637
The objective of this study is to investigate the beam-column strength of sing1y symmetric cold-formed steel channels and to ascertain the reasonability of the design code of cold-formed steel structures. The results of experimental tests were compared with the results of numerical analysis. Forty two specimens, of which parameters are eccentric distance and length of beam-column, were made with three different types of section shape for test. The buckling strength is calculated by trial and error method based on the beam-column theory and tangent modulus concept is used in inelastic region. The results of experimental tests and numerical analysis were compared with the design formula of cold-formed steel structures.
Seismic Performance Assessment of Korean Seismic Design Code for Steel Buildings
Boo, Joung-Bae ; Kwon, Ki-Hyuk ; Yoon, Myung-Ho ; Roh, Hee-Il ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 647~647
The purpose of this study is to evaluate quantitatively seismic performances of Korean seismic design code. The following procedure is presented to evaluate seismic performance. The first is to design the 160 cases of 2D prototype models of the type of moment resisting steel frames according to current seismic design code. Design parameters are the number of stories, yield mechanism and 9round acceleration. The second is to analyze numerically the designed models with DRAIN-2DX program. The restoring force characteristics and the yield mechanisms are obtained from the static elasto-plastic analyses. From nonlinear dynamic analyses results the response modification factors
and the total amount of energy input
are calculated and evaluated. The statistical analysis results show that the average and standard deviation of
are 2.75 and 1.01 each for 120gal and 3.35 and 1.07 each for 240gal. The energy spectrum for design
with 99% confidence limit are evaluated as 62.57kine for 120gal and 91.45kine for 240gal.
Low-Cycle Fatigue Behavior of Welded-Flange and Bolted-Web Connections in Special Moment Resisting Steel Frames
Kim, Sung-Hoon ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 657~657
The main purpose of this paper is to observe and characterize the experimental fatigue behabior of a specific type of beam-column moment connections with bolted-web and welded-flange details. For this purpose, a total of six specimens with three different beam sections were tested under cyclic loadings to study the low-cycle fatigue characteristic. The experimental test program consisted of Constant drift tests and Incremental drift tests. Constant drift tests were carried out, focusing on investigation of low-cycle fatigue performance of the connection. Incremental drift tests were conducted to examine the beam plastic rotation capacity, plastic hinge length and variable drift effects on connection low-cycle fatigue behavior. An equivalent plastic strain and cycle counting concept was introduced in the analytical study of low-cycle fatigue. Low cycle fatigue damage models were developed by using beam flange plastic pseudo strain and beam plastic rotation.
An Experimental Study on the Shear Bond Strength of the New Steel Deck for Composite Floor System
Eom, Chul-Hwan ; Yoon, Myung-Ho ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 671~671
Recently, the usage of composite steel deck is increasing due to its ability to support tension stress by requiring resistance of fire. The load bearing capacity of a composite steel deck increases due to the interaction between concrete and steel deck. The objective of this study is in the evaluation of the shear bond strength of composite slabs for the new shaped composite steel deck. The experiments were performed through the push-out method, and 24 different specimens were observed due to the selected parameters. Applied parameters for the experiments were the thickness of topping concrete, cross sectional shape of steel deck, thickness of a steel deck. and the strength of a concrete.
Discrete Optimum Design of Steel Truss Structures using Simulated Annealing Algorithm
Jeong, Je-Won ; Park, Hyo-Seon ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 679~679
Due to the instability of discrete optimization algorithms and deficiency of generality in formulation of optimization problems, application of optimization techniques on the field of practical design of steel structures has based Primarily on optimization of structural system with continuous design variables. Recently, simulated annealing algorithms have widely been applied to many structural optimization problems In this paper, a discrete structural optimization model with a modified simulated annealing algorithm is presented. In the modified simulated annealing algorithm, the convergence rate, cooling schedule, and stopping criteria of the algorithm are tuned to discrete structural optimization problems.
A Study on Characteristics of Fatigue Crack Growth in SM570 Steel
Kyung, Kab-Soo ; Choi, Jun-Hyeok ; Jeong, Young-Wha ; Chang, Dong-Il ;
Journal of Korean Society of Steel Construction, volume 11, issue 6, 1999, Pages 689~689
Fatigue crack Growth tests were carried out to estimate the characteristic of fatigue crack growth rate for the high strength steel of SM570 steel under various conditions : the variation of heat input conditions, the existence and nonexistence of welding residual stress, the direction of fatigue crack. The test was performed on the compact-type specimens. From the test result, it was known that the fatigue crack growth rate at early stage of fatigue crack due to the welding residual stress at crack tip is faster than that for the case of the nonexistence of the welding residual stress. And, it was shown trend that the fatigue crack growth rate in weld metal under large input condition is sane or lightly higher than that under small heat input condition. Also, in case of the existence of welding residual stress at the crack tip zone of crack growth direction, it was known that the fatigue crack growth rate for the perpendicular direction of welding line is lightly faster than that for the parallel direction of welding line.