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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
직교이방성 판요소들로 구성된 직사각형 압축재의 국부좌굴 강도
Yoon, Soon-Jong ; Chae, Soo-Ha ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 161~161
The fiber reinforced thermosetting plastic composites have been utilized from early of 1940 in the military and aerospace fields due to the superior material properties such as specific high strength and stiffness, light weight, chemical resistance, fatigue resistance, nonconductivity, and nonmagnet. In the construction industries of the developed countries, various structures such as paper mills, chemical plants. off-shore structures, buildings, and bridges had been built with this material. Extensive researches are underway to develop the effective production process and the analysis and design method of the material. Using pultrusion process any type of prismatic thin-walled structural shapes composed of orthotropic plate elements with unlimited length is produced successively. Due to the mass production, this material competes with the conventional construction materials such as concrete and steel even in costs. But the load-deformation characteristics under various loading conditions of the materials are not fully understood. Accordingly, the study on the load-deformation characteristics of the materials to eatablish the design criteria is necessary. This paper presents the equation which can find the local buckling strength of the thin-walled columns composed of orthotropic plate elements. In the derivation of the equation. buckling analysis of orthotropic plates produced by the pultrusion process is peformed based on the classical orthotropic plate theory. These results are used to find the equation for the local buckling strength of thin-walled orthotropic columns. The graphical form of results generated using the mechanical properties given by the manufacture are presented for a design aid.
최적조건식의 직접해를 통한 구조물의 최적화설계
Shin, Yung-Seok ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 173~173
In this research, methods for deriving the optimality conditions to solve for optimal design were discussed. The Lagrange multiplier method is used to derive the optimality equations for a single constraint design problem. Three different technics were used to solve the optimality conditions : a direct solution technic using the Gauss-Newton method, a homotopy technic, and an optimality criteria method. Two examples illustrate how the methods work to find the optimal design. Comparing numerical performance of these technics, one can conclude that the homotopy technic has slow but steady and reliable convergence to the solution. and the optimality criteria method has fast convergence but it often diverges depending on the choice of a step size parameter. The convergence speed of the Newton type method was in between these two other technics, however, the convergence reliability was the worst.
Non-Linear Vertical Vibration Analysis of Suspension Bridges Subjected to Moving Loads
Rho, Bum-Jun ; Kim, Moon-Young ; Shin, Hyun-Mock ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 185~185
In the previous papers, both analytic solutions and finite element solutions considering the effects of the shear deformation and the rotary inertia had been presented in order to evaluate natural frequences and mode shapes of suspension bridges. In this study, by adding the geometric non-linear effects to the stiffness term of main cables, the non-linear vibration theory taking into account combined effects of main cables and shear-flexible stiffening girders are presented and solved by using the suspension bridge element. For variation of the vehicle velocity, the static and dynamic behaviors of 3 span hinged suspension bridges subjected to the moving load are investigated.
A Study on the Shear Fatigue Damage Behavior of Reinforced Concrete Beams Subject to Repeated Loading Using Strut-Tie Model with Damage Concept
Oh, Byung-Hwan ; You, Young ; Han, Seung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 193~193
This paper presents the investigation on the shear fatigue behavior and damage analysis procedure of reinforced concrete beams subject to repeated loading using the, strut-tie model. A comprehensive test program has been conducted for reinforced concrete beams under repeated loading. Damage function is defined as the ratio of deflection at each cycle to the ultimate deflection of inelastic region. This damage function is incorporated into the Strut-Tie model to analyze the shear behavior of RC-beams under repeated loading. The contribution of concrete including aggregate interlocks in the early stage of cracking is considered in the model. The Strut-Tie model combined with damage function is compared with test results. The comparisons include the deflection as well as strain accumulation under repetitive loadings. The results show that the struttie model combined with damage function can describe the shear fatigue behavior of RC beams subject to repeated loading effectively.
An Adaptive Method for Dynamic Finite Element Analysis
Choi, Chang-Koon ; Chung, Heung-Jin ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 203~203
The application of adaptive finite element method to dynamic problems is investigated. Both the kinetic and strain energy errors induced by space and time discretization were estimated in a consistent manner and controlled by the simultaneous use of the adaptive mesh generation and the automatic time stepping. The temporal discretization error can be estimated simply by comparing the solutions obtained by Newmark method with solutions obtained by the locally exact quadratic function. Since the proposed method is not affected by the specific time integration method used, it can be applied to the various time integration method. An optimal ratio of spatial discretization error to temporal discretization error was discussed. In this study it was found that the best performance can be obtained when the specified spatial and temporal discretization errors have the same value. Numerical examples are carried out to verify the performance of the procedure.
An Experimental Study on the Ultimate Behavior of Joints in Precast PC Segmental Bridge
Yoo, Seung-Woon ; Oh, Byung-Hwan ; Kim, Eui-Sung ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 221~221
In recent decades, the precast prestressed concrete segmental method of bridge construction has been increasingly popular. Increased speed of erection, improved aesthetics, and mitigation of traffic disturbances are among the factors which have made precast PC segmental method chosen in many recent bridge projects. Shear behavior and ultimate behaviors of shear key joints are critical problem in the design of precast prestressed concrete segmental bridges. An experimental program was conducted to study the shear behavior and ultimate behavior of joints in precast PC segmental bridges. From the results of this test, we can obtain the guideline of design and analysis of the joints in precast PC segmental bridges.
A Study on the Interaction Analysis between Soil and Rectangular Plate Resting on Elastic Half-space Considering Local Separation Area
Kim, Sung-Chirl ; Cho, Hyun-Yung ; Cheung, Jin-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 231~231
In this study, the finite element procedure to evaluate the distribution of contact pressure between plate and elastic half-space is developed. The vertical surface displacements of an elastic half-space can be obtained through the integrations of the Boussinesq's solution for a point load. The rectangular plate on the elastic half-space is adopted 8-node isoparametric element and Mindlin plate theory is used to consider the transverse shear effect. A new integrating method is developed to construct this stiffness matrix of Boussinesq's half-space, to decrease the oscillation of calculated contact pressure which is quite familiar in the conventional finite element analysis. According to the relative stiffness between half-space and plate or loading condition, some part of plate can be separated with half-space. In this study, iteration procedures are attempted to determine the separated region. This method is discussed to consider the local separation phenomenon which is one of the typical problems in the concrete pavements under wheel loads or the structures on mat foundations. It is possible to determine the contact area between a plate and the foundation by using this procedures. By interchanging the plate with any other superstructure, interaction behavior between superstructure and elastic half-space can be analyzed without difficulty by the proposed method.
A Criterion for the Improvement of Estimating Construction Supervision Cost
Kang, Leen-Seok ; Kim, Chang-Hak ; Lee, Bae-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 243~243
Construction supervision cost has been estimated by the method using standard manhours. The cost depends on the man-hours of high quality engineer, and the man-hours are calculated in proportion to construction cost and construction work complexity in three categories. That is, construction supervision cost varies with the standard manhours because the detailed cost items, such as direct labor cost, overhead expenses. technical cost. and direct expenses, increase or decrease according to the man-hours of engineer. This study aims to increasing quality and efficiency of construction supervision by the proposed new estimating criterion for each cost item and classification of construction work complexity with a more reasonable table. For the study, a working survey on supervision sites and an analysis of questionnaire for supervision firms were carried out. Finally the standard criterion to estimate construction supervision cost is proposed in the form of an expression or a table, and construction work complexity is also reformed in four categories.
A Study on the Cooperational Program of Research Consortium for Technical Development in the Construction Industry
Lee, Kye-Hak ; Choi, Myung-Kyu ; Kim, Min-Hwan ; Lee, Young-Hak ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 253~253
This study aims to propose the betterment ideas for cooperative research and technology development, simultaneously with grasping the mechanism of It. To achieve those aims. We attempted to define the meaning of cooperative research and technology development, and to survey and analyze the current condition and problem of cooperative research and development activities between industry-university-public research institute relation in small and medium construction industries. and to formulate effective policy tools for the promotion of cooperative research and development activities.
Aerodynamic Analysis of Two-Trains Intersecting in a Tunnel
Kim, Heuy-Dong ; Lee, Young-Dai ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_2, 1998, Pages 265~265
As a high-speed train enters a tunnel, a compression wave is generated ahead of it due to the piston action of train. The compression waves propagate along the tunnel and reflect at the exit of tunnel. A complex wave phenomenon appears in the tunnel, because of the successive reflections of the pressure waves at the exit and the entrance of tunnel. The pressure waves give rise to large pressure transients which can impose the fluctuating loads on the running train and tunnel structures. It is highly needed that the pressure transients should be predicted to design the trainbody and the structures in the tunnel and to improve the comfort of the passengers in the train. In the present study, the pressure transients and aerodynamic drag for two-trains running in the tunnel were calculated numerically for a wide range of train speed. and compared with the results of the previous real tunnel tests and calculations for one train. The results of the present calculation are well agreed with the real measurements. and the mechanism of pressure transients was made clear.