Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
Editor in Chief :
Volume & Issues
Volume 19, Issue 3_6 - Nov 1999
Volume 19, Issue 2_6 - Nov 1999
Volume 19, Issue 1_6 - Nov 1999
Volume 19, Issue 3_5 - Sep 1999
Volume 19, Issue 2_5 - Sep 1999
Volume 19, Issue 1_5 - Sep 1999
Volume 19, Issue 3_4 - Jul 1999
Volume 19, Issue 2_4 - Jul 1999
Volume 19, Issue 1_4 - Jul 1999
Volume 19, Issue 3_3 - May 1999
Volume 19, Issue 2_3 - May 1999
Volume 19, Issue 1_3 - May 1999
Volume 19, Issue 3_2 - Mar 1999
Volume 19, Issue 2_2 - Mar 1999
Volume 19, Issue 1_2 - Mar 1999
Volume 19, Issue 3_1 - Jan 1999
Volume 19, Issue 2_1 - Jan 1999
Volume 19, Issue 1_1 - Jan 1999
Selecting the target year
A Study on the Load Distribution Factors for I-Girder Bridges Using F.E.M
Jang, Il-Young ; Song, Jae-Ho ; Nam, Tae-Won ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 265~265
AASHTO Standard Specifications for Highway Bridges Provides simple load distribution factors for design, which have girder spacing only as design variable. However, there may have been serious drawbacks of excessive design. The objective of this paper is to suggest load distribution factors of I-girder bridges that consider the effects of following factors : girder spacing and span length. This study compared the results of field tests to confirm validity of the proposed formulas which were developed using rational finite element analysis and statistic techniques. The result is shown to give new rational formulas which adopt girder spacing and span length as variables
Transient Vibration Test on HANARO Primary Cooling System Piping
Ryu, Jeong-Soo ; Park, Jin-Ho ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 275~275
Piping system vibrations during preoperational and initial startup vibration testing are classified into steady state and transient vibration categories. All maximum vibration levels in steady state operating condition was within the allowable vibration limits. However, transient vibration occurs instantaneously due to the 14" check valve closing to prevent the pump reverse flow. To reduce the impact of check valve in the transient operating condition, the check valve was modified with two proposed concepts which are the hydraulic damper to increase the check valve closing times and the disk support bracket to decrease the dynamic closing behavior. The objective of this test is the assessment of vibration levels of HANARO PCS piping with the used and the modified check valve under the transient operating condition. Test and analysis results show that the PCS piping satisfies the structural acceptance criteria of the ASME code.
Lateral Post-Buckling Analysis of Space Frames Using The Curved Beam Element
Ju, Seok-Bum ; Kim, Moon-Young ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 285~285
This study concentrates on the lateral post-buckling analysis of space frames using the degenerate curved beam element with arbitrary rectangular section. For an accurate evaluation of the torsional stiffness of the beam element, the warping function of the rectangular cross section is introduced in a finite element formulation. The total Lagrangian approach is applied to the large deformation analysis and the formulation takes into account the effect of second order terms of Rodriguez's finite rotations in the incremental displacement field. Numerical examples are presented to verify the necessity of warping functions for the rectangular cross sections in evaluating tangent stiffness matrices.
User-Oriented Programming for Structural Systems Integration Via Hierarchical Modelling
Hwang, Jin-Ha ; Lee, Hak-Sool ; Park, Jong-Hoi ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 297~297
This study is a user-oriented programming work to integrate the structural systems analysis and design. Modular procedures of behavioral analysis, design sensitivity analysis and optimization are interconnected via hierarchical approach based on substructuring. Substructuring gives various advantages for the systems integration of structural engineering works in the physical and procedural aspects, as well as is close to the engineer's mind conceptually. The developed system, which runs on the platforms of the PC windows, renders the users applicability and flexibility in a new computing environment of downsizing trend.
Long-Term Prediction Method of Time-Dependent Effects of PSC Box Girder Bridges Using In-Situ Measurements
Oh, Byung-Hwan ; Yang, In-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 307~307
The prediction of time-dependent behavior of concrete structures plays an important role in the management of infrastructure such as PSC box girder bridges. The prediction accuracy of structural condition directly influences the qualify of maintenance and the decision making of rehabilitation. In this paper, the Bayesian statistical method that uses in-situ measurement data for reducing the uncertainties or updating time-dependent behavior is presented. For Bayesian analysis of time-dependent behavior, prior probability distribution is developed to represent the uncertainties of creep and shrinkage of concrete and likelihood function is derived and used with data acquired in site. Posterior probability distribution is then obtained by combining prior distribution and likelihood function. The numerical results of this study indicate that more accurate prediction of long-term effects due to creep and shrinkage, such as time-dependent deformation and prestress force, is possible. The present study also shows that the increase of the number of measurement data increase the accuracy of prediction and decrease the band of confidence limits for the prediction. The method of present study may be efficiently used to manage the PSC bridges safely.
Reliability Analysis on Shear Behavior of a Discontinuity Adjacent to a Circular Opening in Uncertain Underground Rock Mass
Choi, Kyu-Sup ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 319~319
In this study, a series system reliability analysis on shear failure of a discontinuity adjacent to a circular opening has been performed. To realize the failure surface of the system, Mohr-Coulomb yield criteria and other empirical models suggested by Jaeger. Ladanyi & Archambault, and Barton & Bandis have been adopted. Discontinuity direction, initial stress, pore water pressure and various physical properties obtainable from site investigation and Lab. test in discontinuous rock mass before the design stage are selected as multi-random variables, all of which could be simulated in terms of normal distribution, log-normal distribution, beta distribution or Fisher distribution. In order to obtain generalized reliability index and failure probability, FORM(First-order reliability method) and PNET method have been adopted with improved HL-RF method for an optimization scheme. The effect on the failure probability of cavern size. distance between cavern and discontinuity, distribution forms and correlation coefficients have been reviewed through reliability analysis. The important parameters on system failure probability have been obtained through sensitivity analysis.
A Study on the Load Transfer Efficiency of Jointed Concrete Pavement Using 1/10 Scale Model
Ko, Young-Zoo ; Kim, Pyoung-Su ; Bae, Ju-Seong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 333~333
This paper presents load transfer efficiency of jointed concrete pavement. The test was conducted on 1/10 scale model in the laboratory. The structural models adopted in this study are the strength model. The factors that influence the load transfer characteristics of aggregate interlock and dowel bar diameter at joints were analyzed in the laboratory. Load transfer across the crack is developed either by the interlocking action of the aggregate particles at the faces of the joint or by a combination of aggregate interlock and mechanical devices such as dowel bars. In this study, significant three variables considered to the performance of joints were selected for study : (a) diameter of dowel bars(2.5mm, 3.0mm, 4.0mm), (b) presence or absence of dowel bars, (c) aggregate types(crushed stone, rounded stone). As the experimental results, load transfer efficiency was increased according to the increase of dowel bar diameter. In addition, it is found that model slabs made using crushed stone had better aggregate interlock load transfer characteristics than model slabs made using similarly graded rounded stone.
Exprimental Evaluation of Fatigue Strength of the Butt Weld Joints with Incomplete Penetrations
Chang, Young-Kwon ; Juhn, Gui-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 343~343
During the in-depth inspection of the existing steel bridges, many incomplete penetration defects have been found in the butt weld joints of tension members. It is not only uneconomical but unrealistic to repair all the joints with incomplete penetrations based on the criteria applying to new steel bridges. Therefore it is necessary to estabilish the repair criteria considering the weld defect size and the variable stress level of the members with such weld defects. This paper presents the results of the fatigue tests of the butt weld joints with the incomplete penetrations in the form of a series of S-N curves Total 240 test specimens were tested to evalute the fatigue strength of the joints with the incomplete penetrations ranged from 0 to 40% thickness- defect size ratios. The presented fatigue strength curves can be used for determining the necessity of repair through the fatigue assessment of the butt weld joints with incomplete penetrations
A Study on the Analysis Methods and Assessment of Sectional Properties of PSC Beam Bridges
Kim, Kwang-Soo ; Park, Sun-Kyu ; Kim, Hyeong-Yeol ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 351~351
This paper deals with the assessment of load carrying capacity for both unstrengthened and strengthened PSC beam bridges. Since the behavior of partially prestressed concrete beams is quite different that of reinforced concrete beams, several theoretical equations have been proposed by others to compute the sectional properties of partially prestressed concrete beams. In this study, several factors which may affect the assessment of load carrying capacity of PSC beam bridges are studied. These are the computation of sectional properties, methods of loading, and grillage methods of analysis. Numerical analyses are performed and the results are compared with those of experimental studies for PSC beams as well as load test for a prototype bridge. Based on the results of this study, an improved method is proposed for the assessment of load carrying capacity of PSC beam bridges.
The Dynamic Behavior of the Bridge Due to The Braking Action of a Moving Train
Chang, Sung-Pil ; Kwark, Jong-Won ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 361~361
The effects of moving train with uniform speed and non-uniform speed(braking action) on the dynamic responses of railway bridges are investigated by considering interaction between moving vehicle and bridge through the suspension system. Bridge are modeled to consider girders, cross-beam, piers and slabs in three dimensional space using frames which are formulated based on the finite element method, and special elements for offset and bearings. Train composed of two power cars and eight passenger cars is simulated three dimensionally. New scheme of consideration of braking action on the bridge using speed-dependent braking function is presented in this study. Two types of bridge models for 1-span simply supported bridge(Model R1 and Model R2) and one type for 3-span continuous bridge(Model R3) are used for Parametric studies. Frequencies analyses of simple models composed of plate and frame elements are performed to verify formulated finite elements and compared with the results from ABAQUS which is widely used. Parametric studies on interaction between bridge and vehicle, riding types(i.e. uniform speed or braking) bridge model, various surface irregularities(camber, dipped joint and wheel flatness), ballasting system and force transmitting devices vehicles are performed. Some conclusions on the dynamic behaviors of the railway bridge due to moving train are obtained through various parametric studies.
Determination of Initial Shape and Fabrication Camber for Cable-Stayed Bridges Using Initial Member Force
Kim, Je-Choon ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 377~377
In the structural characteristics of cable-stayed bridges, a large axial force is introduced in the pylon and stiffening girder and the deflection shape is determined by cable tension forces. Therefore, the effecter of axial deformation and cable tension forces must be considered when initial shape and fabrication camber of a cable-stayed bridge is determined. It is very important to evaluate accurate initial shape and fabrication camber because the stresses of the pylon and the stiffening girder under the dead load are minimized when the deformed shape corresponds with the design shape. In this paper, a finite element computational program using 3-dimensional frame element and elastic catenary cable element is developed for nonlinear analysis, and initial shape and camber are evaluated by introducing initial member force. In order to evaluate accurate initial shape and fabrication camber, the mixed method is developed, which introduces all member forces as initial member force just after the analysis introducing axial force as initial member force converges. The usefulness of the algorithm proposed in this paper is verified by some numerical examples.
A Strengthening method of PSC Girder Using External Prestressing and Glass Fiber Reinforcement
Han, Man-Yop ; Yoo, Hyung-Suk ; Park, Sun-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 387~387
In this study, for very seriously damaged PSC girders which cannot be reinforced by one kind of strengthening method, we developed and examined that methods without removing or changing the old girders but strengthening external prestressing and glass fiber reinforcement. However each strengthening methods for PSC girders have Problems, such as external prestressing method has limited for strengthening it by hard to make external anchorage with big load carrying capacity and fiber strengthening method also has limited by its quantify of reinforcement. Therefore we expect the external tendons are for correcting the PSC girders deflections and crack, and the 91ass fiber supports raised tension force by live loads on the bridges and increases damping in girders to decrease impact coefficient, natural frequency and progress of dynamic property. For this study we accomplished field tests to which value load carrying capacity before and after strengthening using external prestressing and glass fiber reinforcement, also measured various value when external tendons were prestressed. As a result the bridges ultimate load carrying capacity which were reinforced with external tendons and glass fiber was above the bridges orignal designed internal force.
Reliability-Based Optimization of Continuous Steel Box Girder Bridges
Cho, Hyo-Nam ; Lee, Du-Hwa ; Chung, Jee-Seung ; Min, Dae-Hong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 397~397
The results of optimum design by the deterministic approach heavily depend upon the safety levels adopted in the current design codes. However, it is now generally recognized that structural design problems are nondeterministic and, thus, optimum structural design must cope with uncertainties involved in the design of structures. Therefore, it may be Positively stated that reliability-based optimum design is more meaningful and rational approach to obtain a real optimum design solution. In the paper, a systematic procedure for a reliability-based optimum design is presented as a rational approach to optimum structural design of steel box girder bridges. Optimum design problems of steel box girder bridges are formulated respectively based on the ASD, LRFD and reliability constraints. An advanced first-order second moment method is used as a practical tool for reliability analysis in the reliability-based optimization algorithm. Uncertainties in the structural strength and loading due to inherent variability as well as modelling and prediction errors are included in the failure limit state of combined bending and shear. For more precise modelling of the optimization of continuous steel box girder bridges, an interactive non-linear limit state model is formulated based on the von Mises combined stress yield criterion. The ASD criteria are used for the optimum design of box girder bridges under reliability constraints whereas both ASD and LRFD criteria are used for codified deterministic optimization. And then, this study comparatively shows the results of the optimum designs for various criteria of design codes. In addition, the results of reliability-based optimization are compared with those of codified optimizations. It is observed that the LRFD-based optimization provides more economical results compared to the ASD-based optimization, while the reliability-based optimization is not significantly different from the LRFD-based optimization as expected.
An Experimental Study on the Flexural Behavior of Cold-Formed Steel Composite Beams
Song, Jun-Yeup ; Kwon, Young-Bong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 407~407
Composite beams of cold-formed profiled steel plate and reinforced concrete have advantages such as light weight, construction time saving, high strength and high ductility in comparison with reinforced concrete beams. A series of tests of composite and reinforced concrete beams was carried out to investigate stiffness ductility and buckling and ultimate strength. The increase of the flexural and shear strength due to confinement of concrete by profiled steel plates has been studied for the practical use. The test results are used to validate the analytical model to predict the moment-curvature and load-deflection relations.
The Static and Fatigue Behavior of Composite Steel-Concrete Beam with Precast Concrete Decks
Shim, Chang-Su ; Lee, Pil-Goo ; Jang, Sung-Wook ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 417~417
Experimental researches are performed to investigate the static and fatigue behavior of composite steel-concrete beam with precast concrete decks. A simply supported composite beam with 8.0 m span designed using the experimental results of push-out tests is fabricated. From the static test, the degree of interaction is evaluated and compared with that of analysis. The fatigue behavior of shear connection is investigated and the flexural stiffness reduction of the composite beam is estimated through the fatigue tests. Main reasons of the flexural stiffness reduction of the composite beam are the loss of bonding between the precast deck and the steel beam and shear stiffness reduction of the shear connection. Bonding and friction between the precast deck and the steel beam increase the fatigue endurance of the shear connection. And the deterioration by the design load is negligible so that composite beam with precast concrete deck satisfies the serviceability. Load redistribution between shear connectors in shear span is satisfactory, and uniform distribution of shear connector can be applicable in simply supported composite steel and concrete bridges.
Development of Advanced Analysis for Steel Frame Accounting for Lateral Torsional Buckling
Kim, Seung-Eock ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 427~427
In this paper, an advanced analysis of the steel frame accounting for lateral torsional buckling has been developed. This analysis can consider material and geometric nonlinearities of structural system as well as degradation of flexural strength due to lateral torsional buckling. Efficient ways of assessing steel frame behavior including nonlinear and inelastic effects are outlined. In this study, a model consisting of the unbraced length and section shape is used accounting for the lateral torsional buckling. The developed advanced analysis has been verified by comparison of the LRFD solution. The Proposed analysis can be used for daily office design of steel frames which are not braced against out of plane motion with an appropriate space. The proposed method eliminates the separate member capacity check after analysis.
Nonlinear Ultimate Pressure Capacity Analysis of Prestressed Concrete Containment Considering Temperature Effects
Moon, Il-Hwan ; Lee, Yong-Il ; Lee, Ki-Seong ; Sim, Jong-Sung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 435~435
This study proposes nonlinear analysis procedures that can predict the ultimate pressure capacity of prestressed concrete containment structure under severe accident loading condition; temperature and pressure. The analyses are performed for containment structure of the nuclear power plant which is now under development, by using two different methods: nonlinear finite element analysis method with ABAQUS program, and numerical analysis method utilizing Mathcad program. For the nonlinear finite element analysis, the containment structure is idealized as an axisymmetric model with axisymmetric solid and shell elements. Both geometric nonlinearity and material nonlinearity including thermal effects are considered in the analyses. Because Mohr-Coulomb failure thermal effects are considered in the analyses. Because Mohr-Coulomb failure surface with corner on hexagon can cause many difficulties and complications in obtaining numerical solutions. Menetrey-Willam criterion with nonassociated flow potential is adopted for this study. In the numerical analysis, all possible containment failure modes are considered. The ultimate pressure capacity is determined by stress and strain limitation. Based upon the results of analysis due to two methods, the temperature directly affects the behavior of liner steel, but on the other hand it shows small effects on the ultimate pressure capacity. Because the applied concrete failure criterion is shown to ensure a satisfied convergence of the numerical solutions in nonlinear finite element analysis, this criterion may be used in the case of severe nonlinear analysis. The numerical method may also be used as an technique for the ultimate pressure capacity analysis required at primary design step since it is far faster than finite element method in solution time.
Modal Testing of Seismic Monitoring System Cabinet of Nuclear Power Plant
Joe, Yang-Hee ; Park, Hyung-Ghee ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_3, 1999, Pages 449~449
In the course of seismic qualification test program of nuclear safety-related equipment. identification test for dynamic characteristics of equipment, usually called exploratory test, is performed prior to main seismic proof test to get useful information for determination of the test method and interpretation of results of qualification test. Modal identification test is also frequently used for the verification of analytical models used in seismic qualification by analysis. This paper presents the procedure and the results of modal identification test of a central processing unit cabinet of seismic monitoring system for nuclear power plant. From the test result and its interpretation, modal properties (modal frequency, mode shape, and modal damping) of the specimen have been satisfactorily identified. The results of the study showed that the specimen behaves in significant nonlinear manner under postulated earthquake motion in Korea.