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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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Korean Society of Steel Construction
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Volume & Issues
Volume 13, Issue 5 - 00 2001
Volume 13, Issue 4 - 00 2001
Volume 13, Issue 3 - 00 2001
Volume 13, Issue 2 - 00 2001
Volume 13, Issue 1 - 00 2001
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Viscoelastic Bending, Vibration and Buckling Analysis of Laminated Composite Plates on Two-parameter Elastic Foundation
Han, SungCheon ; Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 443~455
An energy method has been used for an elastic formulation of bending vibration and buckling analysis of laminated composite plates on two-parameter elastic foundations. A quasi-elastic method is used for the solution of viscoelastic analysis of the laminated composite plates. The third-order shear deformation theory is applied by using the double-fourier series. To validate the derived equations the obtained displacements for simply supported orthotropic plates on elastic foundations are compared with those of LUSAS program Numerical results of the viscoelastic bending vibration and buckling analysis are presented to show the effects of layup sequence number of layers material anisotropy and shear modulus of foundations.
Experimental Investigations of Ultimate Strength for Siffened Plates with High-Strength Steel
Hwang, Won-Sup ; Park, Wan-Bae ; Cho, Eun-Sang ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 457~466
The behavior of stiffened plates with high strength steels (SM570 and POSTEN80) are experimentally investigated The results of compression tests on 7 specimens are reported herein. Based on the results the effects of width-thickness ratio of plate element and flexural rigidity of rib are examined. The strength behavior of stiffened plates are discussed with the comparisons of ultimate strength and design strength curve Furthermore experimental and FEM analysis results are also compared.
Remaining Life Prediction of Deteriorating Bridges Based on Lifetime System Reliability
Yang, Seung Ie ; Han, Sang Chul ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 467~476
The construction of highway bridges is almost complete in many countries including the United States. The government and highway agencies change the focus from constructing to maintaining To maintain the bridges effectively there is an urgent need to assess actual bridge loading carrying capacity and to predict their remaining life. The system reliability techniques have to be used for this purpose. Based on lifetime distribution (function) techniques this study illustrates how typical highway bridges can be modeled to predict their remaining life. The parameters of lifetime distribution are generated by Monte. The results can be used for optimization of planning interventions on existing bridges.
A Study on the Comparisom of Load-carrying Capacity by the rating Methods of Bridges
Han, Sang Chul ; Yang, Seung Ie ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 477~492
About half of bridges in United States are considered to be deficient and therefore are in need of repair or replacement. Half of these are functionally obsolete, and others do not have required strength For these bridges repairs and replacements are needed To avoid the high cost of rehabilitation the bridge rating must corectly report the present load-carrying capacity Rating engineers use Allowable Stress Design(ASD) Load Factor Design(LFD), and Load Resistance Factor Design(LRFD) to evaluate the bridge load carrying capacity In this paper the load rating methods are introduced and bridge load test data are collected. The reasons that make the difference between test results and analytical results are explained for each bridge load test And load rating methods are applied to real bridge. The rating factors from each method are compared.
Seismic Design of Rib-Reinforced RBS (Reduced Beam Section) Steel Moment Connections Based on Equivalent Strut Model
Lee, Cheol Ho ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 493~502
This paper describes a seismic design procedure for rib-reinforced RBS(Reduced Beam Section) steel moment connections. Engineers often use rib plates to enhance seismic performance of steel moment connections. thinking that the 2nd moment of inertia is increased so that the tensile stress in the beam flange groove weld is reduced However the force transfer mechanism in the rib connections is completely different from that as predicted by the classical beam theory ; a clear diagonal strut action is present in the rib. By treating the rib as a strut the writer has recently proposed an equivalent strut model that could be used as the basis of a practical design procedure. In this paper the proposed equivalent strut model is briefly presented first. A step-by-step design procedure is then recommended based on the proposed model.
Behavior of Shear Yielding Thin Steel Plate Wall with Tib
Yun, Myung Ho ; Wi, Ji Eun ; Lee, Myung Ho ; Oh, Sang Hoon ; Moon, Tae Sup ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 503~511
Structures are designed against earthquakes and reinforced concrete shear walls or steel bracings are usually used as aseismic resistant element. However their hysteretic characteristics in plastic region ductility and capacity of energy absorption are not always good. Besides their stiffness is so rigid that structure designed by static analysis is occasionally disadvantageous. when dynamically analized. Generally a steel plate subjected to shear force has a good deformation capacity Also it has been considered to retain comparative shear strength and stiffness Steel shear wall can be used as lateral load resistant element for seismic design. However there was little knowledge concerning shear force-deformation characteristics of steel plates up to their collapse state In this study a series of shear loading tests of steel plate collapse state. In this study a series of shear loading tests of steel plate surrounded by vertical and horizontal ribs were conducted with the parameters of D/H ratios rib type and the loading patterns. The test result is discussed and analyzed to obtain several restoring characteristics. that is shear force-deformation stiffness and yield strength etc.
Inelastic Behavior of H-Shaped Beams with Web Openings under Cyclic Loading
Lee, E.T. ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 513~524
A total of nine H-shaped beams with web openings under cyclic loading condition were investigated. The dimension criteria are based on the formulae proposed by Darwin. The suitability of existing design formulae the effects of plastic hinge on beams with web openings the fracture around the web openings and the influence of cracks neighboring web openings to the beam strength under cyclic loading were also investigated through the observation of the behavior of these beams with various opening dimensions. locations numbers and spacing between the two openings.
A Study on the Identification Method for Flutter Derivatives of Bridge Girders using Displacement Time History Data
Lee, Jae Hyung ; Min, Won ; Lee, Yong Jae ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 525~533
The wind resistant design of long-span bridges has urged a special attention to the prevention of the flutter occurrence Therefore calculation of flutter derivatives is indispensable to this prediction. A used system identification method must identify all the flutter derivatives from noisy experimental data In this paper MITD(Modified Ibrahim Tim Domain) method and AKF (Adaptive Kalman Filter) method are applied to extract flutter derivatives from section-model tests. The robustness and reliability of proposal SI methods under a high signal-to-noise ratio is demonstrated through numerical simulation for windtunnel test.
The Comparison of Frame with Rigid Connections and Semi-rugid Connections using the RPH-2DF
Son, Seong Yong ; Lee, Sang Sup ; Moon, Tae Sup ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 535~545
A refined method of analysis which is called the Advanced Analysis has been introduced This method is to consider the intial member imperfection residual stress and second-order effects so as to estimate the overall behavior of steel frame accurately Based on the refined plastic hinge method that is more suitable and practical in design practice. the program RPH-2DF is coded using the log model which represents the moment-rotation relationship of connection. The validity of this program is examined by frame test data. Finally to investigate the difference between behaviors of rigid and semi-rigid frame. the 10-story frame analysis results designed by MIDAS-GEN v4.2.2 are compared with the results by RPH-2DF.
Effect of Mechanical Constraints on the Angular Distortion of Welding Joints
Park, Jeong Ung ; Lee, Jae Won ; Lee, Hae Woo ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 547~556
This study presents new method in which to derive the constraint coefficient from the quantity of angular deformation by welding measured by varying the shape of welded joints and the magnitude of constraints by varying the shape of welded joints and the magnitude of constraints by experiment and from the result analyzed by elastic FEM method and then to decide equivalent load with it The numerical analysis results by this new method verified the validity by agreeing with the experimental result on specimen. In addition These results are applicable to the prediction of the quantity of welding deformation for large structures regardless of the size and the shape While in the effects of the constraints based on the shape of welded joints in the case of Butt welding when the constraint coefficients are not considered the deformed quantity is produced larger than one by the experiment and consequently is largely affected by the constraints But in the case of Fillet welding the deformed quantity is seldom affected regardless of considering the constraint coefficients or not.
A Shear Bond Chracteristics of Composite Slab with Closed-Shape Deckplate
Ju, Gi Su ; Park, Sung Moo ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 557~566
Composite slab with deckplate needs sufficient bond strength between deckplate and concrete to conduct composite behavior Composite slab can transfer the shear by either chemical adhesion interface interlock, or active friction. There are several way of mechanical shear connection in composite slab. that is embossments shear connector shape of deckplate etc. Effect of mechanical interaction is deped on shape of deckplate which is to prevent peeling between deckplate and concrete and an amount of shear connector. The behavior and strength of the connection between the decking and the concrete slab due to embossments and end anchorage may be estimated using the push-off tests described in this paper We proposed the equation of shear bond strength in the composite slab It will be use to design by basic data in composite slab.
Reliability Analysis of Plane Stress Element According to Limit State Equations
Park, Seok Jae ; Choi, Wae Ho ; Kim, Yo Suk ; Shin, Yeong-Soo ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 567~575
In order to consider statistical properties of probability variables used in the structural analysis the conventional approach using the safety factor based on past experience usually estimated the safety of a structure Also the real structures could only be analyzed with the error in estimation of loads material characters and the dimensions of the members. But the errors should be considered systematically in the structural analysis Safety of structure could not precisely be appraised by the traditional structural design concept Recently new aproach based on the probability concept has been applied to the assessment of structural safety using the reliability concept Thus the computer program by the Probabilitstic FEM is developed by incorporating the probabilistic concept into the conventional FEM method. This paper estimated for the reliability of a plane stress structure by Advanced First-Order Second Moment method using von Mises, Tresca and Mohr-Coulomb failure criterions. Verification of the reliability index and failure probability of attained by the Monte Carlo Simulation method with the von Mises criterion were same as PFEM, but the Monte Carlo Simulation were very time-consuming. The variance of member thickness and load could influence the reliability and failure probability most sensitively among the design variables from the results of the parameter analysis. The proper failure criterion according to characteristic of materials must be used for safe design.
The System Shape and Size Discrete Optimum Design of Space Trusses using Genetic Algorithms
Park, Choon Wook ; Kim, Myung Sun ; Kang, Moon Myung ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 577~586
The objective of this study is the development of sizing and system shape discrete optime design algorithm which is based on the genetic algorithms (GAs). The algorithm can perform both size and shape optimum designs of space trusses. The developed algorithm was implemented in a computer program. The algorithm is known to be very efficient for the discrete optimization The genetic process selects the next design points based on the survivability of the current design points The evolutionary process evaluates the survivability of the design points selected from the genetic process in the genetic process of the simple genetic algorithms there are three basic operators : reproduction cross-over and mutation operators. The efficiency and validity of the developed discrete optimum design algorithm was verified by applying the algorithm to optimum design examples.
A Study on the Nonlinear Instability Behavior of Hybrid Structures(I) - Characteristic of Static In-Plane Torsional Buckling by Initial Shape Imperfection-
Kim, Seung Deog ; Son, Su Deok ; Kim, Hyung Seok ; Kang, Moon Myung ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 587~597
The structural system that discreterized continuous shells is frequently used to make dome-type structures and these structures show the unstable phenomena by snap-through or bifurcation when a load level reaches certain critical value. The characteristic structural behaviour of a cable dome shows a strong nonlinearity and very sensitive according to the initial imperfection. In this study the shape finding problem by applying initial tension stress is investigated and using this the unstable phenomena of perfectly shaped and initially imperfected shape model by external forces are examined to grasp the unstable behavior of cable dome using the Geiger-type model.
A Study on the Nonlinear Instability Behavior of Hybrid Structures(II) -Characteristic of Dynamic In-Plane Torsional Buckling under the STEP Load-
Kim, Seung Deog ; Kim, Hyung Seok ; Kang, Moon Myung ;
Journal of Korean Society of Steel Construction, volume 13, issue 5, 2001, Pages 599~608
Many papers which deal with the dynamic instability of shell-like structures under the STEP load has been published but there have been few papers related to the dynamic instability of hybrid cable domes. And also there are a few researches which treat the essential phenomenon of the dynamic buckling using the phase for investigating occurrence of chaos. In this study the indirect buckling of hybrid cable domes considering geometric nonlinearity are investigated numerically and compared it with the static critical load The dynamic critical loads are determined by the numerical integration of the geometric nonlinear equation of motion and the mechanism of the indirect buckling is examined by using the phase curves.