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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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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
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Analytical Frequency-Dependent Two Dimensional Infinite Elements for Soil-Structure Interaction Analysis
Yun, Chung-Bang ; Kim, Doo-Kie ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 1~1
Analytical frequency-dependent elements are developed for soil-structure interaction analysis in two-dimensional medium. Using the proposed infinite elements. the dynamic stiffness matrix of the far field soil region can be obtained analytically in terms of exciting frequency and constant matrices, and the dynamic responses can be analyzed efficiently. To examine the performance of the proposed infinite elements, compliances of rigid strip foundations are analyzed for several soil conditions. The results are found to be in good agreements with those by other methods. The dynamic stiffness matrix obtained by the present infinite elements can be transformed into terms in time domain, and it may be able to carry out the analysis in time domain.
Occupant Risk Evaluation of Roadside Guardrails by Flail Space Model
Lee, Seung-Joon ; Lee, Gi-Duk ; Woo, Kwang-Sung ; Kwon, Hyug-Moon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 13~13
The nonlinear dynamic behavior of guardrails established on the local and express ways has been simulated by BARRIER VII program during the time of vehicle collision. This study has been focused on the occupant risk using on Flail Space Model and Olsen Model that is one of main issues for roadside safety structures. The experimental parameters for computer simulation can be classified into soil condition. type and spacing of post. vehicle weight, impact velocity and angle. The numerical results by computer simulation have been compared with the design limit in the Guide for Roadside Safety Appurtenances of Korea. Also, the dynamic behavoir for small vehicles that are main traffic facilities in the roads has been appraised by the criteria in NCHRP Report 350. It may be concluded that the current design criteria of the domestic code are not realistic and hence it is necessary to modify the design limit of maximum deflection and vehicle acceleration for small vehicles.
Vibration Analysis Using Finite and Infinite Elements for Axisymmetric Soil-Structure Systems Subjected to Vertically Incident Seismic Waves
Yun, Chung-Bang ; Kim, Jae-Min ; Park, Kyung-Lae ; Choi, Jun-Seong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 25~25
This paper presents a vibration analysis method for axisymmetric soil-structure interaction systems subjected to vertically incident seismic waves. It is based on the complex response method in frequency domain and the finite and infinite element techniques. In the proposed method, equivalent earthquake forces are evaluated using the infinite element method and the free-field responses of horizontally layered half-space along the interface between near field and far field which are calculated priorly by other semi-analytical approach. Since the present technique yields directly total responses in the soil region near the structure, it can easily be extended to nonlinear analysis using an equivalent linearization technique in frequency domain. Example analyses have been carried out to verify the proposed technique for site-response problem of multi-layered half-space medium subjected to vertically incident shear and compressional waves. Numerical results confirmed that the present methodology gives accurate solutions and easy way of modelling soil-structure systems.
Proposed New Model for the Stress-Strain Relationship of Ultra High-Strength Concrete
Jang, Il-Young ; Park, Hoon-Gyu ; Lee, Jang-Hwa ; Yoon, Young-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 41~41
This paper presents the newly developed model for the stress-strain relationships of ultra high-strength concrete on the basis of the more refined statistical technique to analyze the various test results available in the literature. Through the comprehensive analysis of the previously existing equations for each model, multiple curves equation has turned out to be most appropriate to simulate the linearly varying ascending branch and brittle type of descending one. The principal variables to model the stress-strain relationship such as the modulus of elasticity, ultimate strain and deformation characteristics due to stress softening phenomenon were extensively studied to be simplified in the function of the concrete compressive strength. The ascending curve and descending curve obtained from the proposed method show good agreement with experimental results and also show better predictions than by any other proposed models.
Hydration Heat Analysis in Sequential Placement of Massive Concrete
Jung, Chul-Hee ; Chung, Young-Soo ; Cheon, Hwan-Seok ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 49~49
The hydration heat of cement causes the internal temperature rise and the volume change in massive concrete structures at an early age. Due to the temperature rise under restraint boundary conditions in concrete structures, thermal cracks can be occured when thermal stress due to hydration heat in concrete exceeds its tensile strength. Crack decreases the durability of concrete. The objective of this research is to compute the history of temperature and thermal stress in sequential placement of massive concrete. HYCON.FOR has been developed based on the computer programs which have been developed in KAIST. The result by this program has been compared with those by ADINA-T and DIANA which are well-known compter programs for this field. Good agreement has been obtained with those by the commercial programs. Thus, it is concluded that the developed program is effective for the evaluation of hydration heat and thermal stress in sequential placement of massive concrete structures.
Optimum Design of Framed Structures with Composite Section by Using SUMT
Jung, Young-Chae ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 59~59
The aim of this study is to develope the algolithm which is able to design the optimal sizes of the composite framed structures constituted with the beams and the colums which are composed of H steel section and concrete. The optimizing problems of the composite framed structures are formulated with the objective functions and the constraints which take the section sizes as the design variables. The objective functions are formulated as the total costs of the structures and the constraints are derived by using the criteria with respect to the working stress considering the part of steel bridge in the Korean standard code of highway bridge and the AISC specification, and the lower limit section sizes. The algorithm optimizing the section of the composite framed structures uses the SUMT method utilized the modified Newton Raphson direction method. The optimizing algorithm developed in this study is applied to the numerical examples with respect to the 1-bay, 1-story composite framed structure and the 1-bay, 5-story one for the practical utilization of design on the composite framed structures. And their numerical results are compared and analyzed to examine the possibility of optimization, the applicablity and the convergency of this algorithm.
Development of Random Polygon Mesh Generation for Discrete Element Method
Rhie, Yoon-Bock ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 71~71
With rapid advances in computer hardware and visualization systems, geometric computing has an important role at every comer of science and engineering. As a part of it, the polygon mesh generation is adopted to model some materials realistically. This paper contains the results of the development of polygon mesh generation for the Discrete Element Method (DEM). A new simple polygon mesh generation scheme for the numerical model is presented and Delaunay triangulation is used for the basic modeling scheme. Current generation model can be widely used to predict the failure behavior for the quasibrittle material i.e., concrete structure using elementary inclusion level modeling of the concrete and the interaction between inclusions and matrix, rock behavior in the tunnel analysis, and the interaction between structures and foundations.
Fracture Analysis of Concrete Using Discrete Element Method with Simple Polygon Mesh Generation
Rhie, Yoon-Bock ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 83~83
In this paper, the results of research on the development of fracture and crack propagation in plain concrete studied with the Discrete Element Method (DEM) are presented. A new discrete element numerical model is proposed as the basis for analyzing the inelastic evolution and growth of concrete cracks up to the point of global material failure. The algorithm generates normal and shear forces between two interfacing blocks and contains two kinds of contact logic, one for connected blocks and the other one for blocks which are not directly connected. The Mohr-Coulomb theory has been used for the fracture criterion. In setting up a discrete element model, the two-dimensional polygons are used. The response of concrete, which is modeled with different shape. size, and orientation of polygons, are investigated under uniaxial compression. Circular elements, which have been used so far, are not used here because they are not proper for the realistic modeling of concrete. Delaunay triangulation is used for a new type of 2D polygon mesh generation. Several examples involving large assemblies of particles are presented to examine the fracture patterns of concrete. The fracture patterns appear to be realistic comparing with experimental works.
Experimental Study for Assessments of Precast Concrete Underground Parking Garage
Kwak, Hyo-Gyoung ; Yun, Chung-Bang ; Lee, Hyeong-Jin ; Lee, Seok-Yong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 97~97
The actual structural behaviors under wheel loads can be much different from those under uniform loads which are frequently adopted for the design of parking garage. In such a viewpoint. the structural behavior of a Half-PC concrete underground parking garage under vehicle loads was investigated using the site instrumentation. Static wheel loads were applied on the structure to evaluate the actual live load capacity, and moving load tests were also performed to evaluate the impact factors of the structure. Besides, impact tests were conducted to estimate the modal parameters of the structure. Through the experimental investigations, it was found that the construction quality of the underground parking garage can be improved by use of the Half-PC concrete structure. It was also found that the uniform load concept is unsuitable for the design of parking garage.
Postbuckling Behavior of Rectangular Plates Considering Phenomenon of Buckled Mode Change
Shin, Dong-Ku ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 111~111
A postbuckling analysis of simply supported rectangular plates based on the principle of minimum potential energy is presented. In the postbuckling load range, plates are allowed to change their buckled shape. The nonlinearity of strain components in the von Karman sense is incorporated to the classical plate theory. The inplane and out-of-plane displacements are assumed as a truncated Fourier series. A system of nonlinear algebraic equations for the unknown parameters in the displacements is obtained applying the principle of minimum potential energy. The magnitudes of the total potential energy for deformed shapes associated with different buckling modes are compared to determine the actual deformed shape. The stableness of the deformed shape is established by assuring the positive definiteness of the Hessian matrix of total potential energy with respect to the unknown parameters in displacements. Two types of inplane boundary conditions in the plane of the plate along unloaded sides are considered. Several numerical examples based on the present study are presented. The effects of the aspect ratio. inplane boundary conditions, and the effective width on the postbuckling behavior of plates are analyzed.
A Study on the Determination of the Contact Area of the Circular Plate Resting on Compression-only Elastic Half-space under Axisymmetric Loading
Kim, Sung-Chirl ; Cho, Hyun-Yung ; Cheung, Jin-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 125~125
In this study, the finite element procedure to evaluate the distribution of contact pressure between a circular plate and elastic half-space is developed. It is assumed that the foundation follows Boussinesq's hypotheses and the load acts axisymmetrically. The displacement of half-space due to axisymmetric surface loading can be evaluated by double integration of Boussinesq's solution. On that case the analytical integration for the circumferential direction is impossible and the numerical integration should be considered. With the radial integration we can get non-dimensional function. The non-dimensional normalized numerical solution of the surface displacements of the elastic half-space under uniformly distributed axisymmetric loading is obtained from the results. The flexibility matrix of elastic half-space is constructed as the coefficient matrix of nodal contact pressure by the finite element procedures. The present method considers the local separation phenomenon which is one of the typical contact problems between elastic bodies. It is also possible to determine the contact area between a circular plate and foundation by using this method.
A Study on the Curling Stress at the Transverse Joint Edge of Concrete Pavement Slab by FEM Analysis Model
Bae, Ju-Seong ; Ko, Young-Zoo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 133~133
In this paper, we obtained the curling stresses caused by temperature differences at the transverse joint edge of concrete pavement slab by FEM analysis model. In the FEM analysis model, traffic loading and the structural conditions of pavement were used as variables, and concrete slab and foundation were assumed respectively finite plate element and Winkler elastic foundation. Multi-regression analysis was applied to the results of the FEM numerical calculations, and consequently, a curling stress equation was obtained. After the comparison between calculated results of the proposed equation and the curling stress eqations developed in the past, it was confirmed that the equation was valid and practical.
A Reliability Analysis on the Blast Vibration Equation
Park, Yeon-Soo ; Park, Sun-Joon ; Kang, Sung-Hoo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 143~143
The actual ground vibrations due to NATM blasting and foundation blasting at Seoul (weathered rock), Pusan(weathered rock) and Youngkwang(quartz andesite) have been measured, and the data were analyzed using reliability index(
) to determinate the maximum charge weight per delay within a given vibration criteria and the blast vibration equation. In this study, the blast vibration equations and the maximum allowable charge weight was suggested with the division of ultimate limit state(
), serviceability limit state(
) and safety state(
) respectively. The reliability index 0 means 50% data line obtained by the least squares best-fit line. The reliability index 1.28 and 3 represent bounds below 90%, and 99.9% of the data, respectively. The vibration constant K for ultimate limit state, the serviceability limit state and the safety state was evaluated to 315, 385, 503(Seoul) 407, 580, 930(Pusan) and 1132, 1654, 2750(Youngkwang), and the attenuation coefficients of vibrations due to the blasts were -1.98(Seoul), -2.04(Pusan), -2.23 (Youngkwang) respectively. From this study, inference and analysis methods of vibration equations using realibility theory was estabilished.
Development of 3-Dimensional Dynamic Analysis Program for Saturated Geologic Media
Kim, Sun-Hoon ; Kim, Jhin-Wung ; Kim, Kwang-Jin ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_1, 1998, Pages 153~153
A three-dimensional dynamic analysis program for saturated geologic media is developed in this study. The theoretical formulations incorporated in the proposed computer program are the extension of Biot's two-phase theory to nonlinear region. Numerical-study for typical verification problems is carried out to show the validation of the computational algorithms of the computer program. It is shown that the computer program is a useful tool for the analysis of the structural safety evaluation of underground openings in natural geologies during construction and post-construction period.