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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
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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
Analytical Study on the Base Isolated Bridge with PTFE Sliding Bearings
Kim, Hyo-Bum ; Jung, Gil-Young ; Eum, Seong-Woo ; Park, Jong-Chan ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 149~149
In this paper the behavior of a base isolated bridge using PTFE(Poly-tetra-fluor-ethylene) as a Coulomb friction damper and linear spring as a restoring device is studied through finite element analysis. The seismic analyses are carried out for three different earthquakes. Two of them are historic earthquakes known as El Centre and Taft. The other one is an artificial earthquake for the ground condition of rock. Five different types of bridge connections are investigated, including three base isolated cases with different arrangements on the piers. The coefficient of friction is taken as 9% based on the experimental data. It has been found that the energy dissipation capability of Coulomb damping is very beneficial to the structure especially in strong earthquake motion. The shear force on the piers of isolated bridge is reduced to maximum 48% compared to non-isolated bridge in minor earthquake.
An Analytical Model of Stresses at the Interface of Plated RC Beams
Sim, Jong-Sung ; Kim, Gyu-Seon ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 161~161
In the case of reinforced concrete beams strengthening by plate, beams collapse due to the stress concentration at the ends of plates before the design expected failure. This kind of failure is called Premature failure. Both comprehensive experimental and theoretical work related to the premature failure have been performed. In this paper, analytical models of the shear and normal stresses in the adhesive layer of a beam which has strengthening plate on its bottom faces are presented. The predicted results agree with results of commercial finite-element analysis. The results from both theory and finite-element analysis show that the stresses are very large at the end of the plate, but they quickly diminish with moving nearer the center of the beam.
Design of RC Plates and Shells Subjected to Membrane Force and Flexural Moment
Min, Chang-Shik ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 171~171
An iterative numerical computational algorithm is presented to design a plate or shell element subjected to membrane and flexural forces Based on equilibrium consideration, equations for capacities of top and bottom reinforcements in two orthogonal directions have been derived. The amount of reinforcement is determined locally. i. e., for each sampling point, from the equilibrium between applied and internal forces. One case of design is performed for a hyperbolic paraboloid saddle shell (originally used by Lin and Scordelis) to check the design strength against a consistent design load, therefore, to verify the adequacy of design practice for reinforced concrete shells. Based on nonlinear analyses performed, the analytically calculated ultimate load exceeded the design ultimate load from 11% to 30% for an analysis with relatively low to high tension stiffening,
cases. For these cases, the design method gives a lower bound on the ultimate load with respect to Lower bound theorem. This shows the adequacy of the current practice at least for this saddle shell case studied. To generalize the conclusion more designs - analyses should be performed with different shell configurations.
Time-dependent Analysis of Cracked Reinforced Concrete Sections
Kim, Jin-Keun ; Lee, Sang-Soon ; Yang, Joo-Kyoung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 185~185
An analytical approach for the calculation of time-dependent stresses and strains in initially cracked reinforced concrete section was proposed. The method utilized the aging coefficient approach of Bazant and the linear creep theory. Noncoincidence of the neutral axis of strain with the neutral axis of stress was taken into account in the analysis. The position of neutral axis and strain and stress distributions of fully cracked section after creep and shrinkage were determined from the requirements of strain compatibility and equilibrium of a section. The expressions were developed for T section, from which expressions for rectangular section were deduced. With this proposed algorithm, rectangular and T sections were analyzed and a comparative analysis of the effects of steel ratio in reinforced rectangular section was also conducted.
A Study on Flexural Toughness Evaluation Method of Fiber Reinforced Concrete
Bae, Ju-Seong ; Kim, Kyoung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 195~195
Fiber reinforcement can significantly improve the properties of concrete Particulary, toughness or energy-absorbing ability of fiber reinforced concrete(FRC) is far superior to that of unreinforced concrete. Toughness is a measure of energy absorption capacity and has been used to characterize the ability of fiber reinforced concrete to resist fracture when subjected to static, dynamic and impact loads. However, the current standard methods of characterizing the toughness of fiber reinforced concrete have proven to be some inadequate and problematic and have caused a great deal of dissent and confusion. This study researches some of the inadequacies and problems in using these toughness measurement methods and proposes the valid evaluation method for the toughness of fiber reinforced concrete.
Elastic Restraining Effect of Plate Elements for Local Buckling of Orthotropic Compression Members
Yoon, Soon-Jong ; Chae, Soo-Ha ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 203~203
The mechanical properties of fiber reinforced plastic materials produced by the pultrusion process are usually regarded as otrhotropic. Due to the attractive material properties, this material is considered as an alternative of conventional construction materials. But due to the lack of reliable design criteria for this material, the design engineers are reluctant to use. Therefore, analytical as well as experimental research on the structural behavior of this material is necessary. Using the equilibrium approach, local buckling analyses of orthotropic compression members are conducted. In the analysis, the elastic restraining effects between the adjacent plate components are taken into account. The minimum buckling coefficients with respect to the ratio of width to thickness for the rectangular box, channel, and zee section columns are shown graphically. In addition, the dominant plate component initiating the local buckling behavior of structural shapes is also identified and the result is plotted with dotted line on the curve so that the efficient cross-sectional dimensions for increasing local buckling strength can be established.
Passive Control of Bridge Vibrations under Successive Moving Loads
Kwon, Soon-Duck ; Lee, Il-Keun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 215~215
The bending control device equipped with lead shear damper is proposed to mitigate the bridge vibration under moving loads. An analytical method for free vertical vibration of piecewise uniform continuous bridge, and the equation of interactive motion among bridge, successive vehicular loads and vibration control devices were newly derived to investigate the feasibility of proposed device. Equivalent damping of bridge induced by vibration control devices is also proposed. In the numerical simulation, various vibration control methods were investigated for comparison and the effects of successive moving loads on dynamic response of bridge and control performance were studied.
The Design Equations of Ultimate Strength for CHS Tubular Joints by Modified Ring Model
Ok, Jae-Ho ; Kim, Dae-Joong ; Woo, Kwang-Sung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 227~227
The current design equations for ultimate strength of tubular joints are based on a limited number of experimental results performed on simple joints with simple loading conditions and depend on value of the branch to the chord diameter ratio
too much. Therefore, the purpose of this study is to estimate the ultimate strength of CHS tubular joints considering the effects of branch inclination angles
, chord length to diameter ratio
and chord end conditions by finite element analysis. The analyses are performed using finite element software ADINA that is capable of modeling the elasto-plastic material behaviors as well as geometric nonlinearities. The results show that the current use of
in normalized design equations for inclined branches is reasonable, but somewhat conservative. When compared with the previous experimental database, the close numerical results are obtained from the parametric studies on the static strength of T-, Y-, DT- and X-joints. Also, a new design equation for ultimate stregth of CHS tubular joints is derived using a modified version of the ring model which can include the effects of
and chord end condtion.
Active Vibration Control of Uncertain Structural Systems with
Control Theory and Bilinear Transform
Koh, Hyun-Moo ; Park, Kwan-Soon ; Park, Won-Suk ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 241~241
Mathematical model can be obtained by physical law or engineering theory to describe the real system. In the use of active controllers to suppress the vibrations due to earthquake or wind loads, control systems sometimes can not have sufficient control effects because mathematical model is always incomplete expression of real system. In this paper, for the systems which have uncertain natural frequency and design constraints, robust and optimal controller design method is developed and numerical simulations are Performed to verify the effectiveness and adaptability of the algorithm. Presented algorithm,
control with bilinear transform can consider the robustness to the uncertainties and performance specification of the controller. Numerical results show that proposed controller can be applied very effectively to the problems of performance degradation due to mistuning effects of hybrid mass damper caused by several errors.
Probabilistic Risk Assessment using Fuzzy Event Tree Analysis For Cable-Stayed Bridge Construction
Cho, Hyo-Nam ; Lee, Seung-Jae ; Lim, Jong-Kwon ; Kim, Kwang-Seop ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_2, 1999, Pages 253~253
As basic research for development of systematic probabilistic risk assessment, Event Tree Analysis, one of the existing risk analysis and modeling techniques, may not be suitable for realistic risk assessment for large construction projects such as long-span bridge constructions because it is very complex and difficult to estimate occurrence frequency and conditional failure probability of the risk events precisely. Therefore, this paper presents systematic probabilistic risk assessment model and suggests an approach for probabilistic risk assessment of PSC cable-stayed bridges using advanced Event Tree Analysis introducing Fuzzy set theory concepts, so called Fuzzy Event Tree Analysis. It may be stated that the systematic models and methods for probabilistic risk assessment of large cable-stayed bridge construction proposed in this paper may be very useful in practice for the realistic assessment of construction projects.