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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 17, Issue 3_6 - Nov 1997
Volume 17, Issue 2_6 - Nov 1997
Volume 17, Issue 1_6 - Nov 1997
Volume 17, Issue 3_5 - Sep 1997
Volume 17, Issue 2_5 - Sep 1997
Volume 17, Issue 1_5 - Sep 1997
Volume 17, Issue 3_4 - Jul 1997
Volume 17, Issue 2_4 - Jul 1997
Volume 17, Issue 1_4 - Jul 1997
Volume 17, Issue 3_3 - May 1997
Volume 17, Issue 2_3 - May 1997
Volume 17, Issue 1_3 - May 1997
Volume 17, Issue 3_2 - Mar 1997
Volume 17, Issue 2_2 - Mar 1997
Volume 17, Issue 1_2 - Mar 1997
Volume 17, Issue 3_1 - Jan 1997
Volume 17, Issue 2_1 - Jan 1997
Volume 17, Issue 1_1 - Jan 1997
Selecting the target year
Effect of an Excitation Randomness on Nonlinear Behaviors of a Piecewise-Linear System in the Ocean Field
Mha, Ho-Seong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 823~823
System responses of a piecewise-linear system are examined to see the nonlinear behaviors of a mooring system in the ocean field. The stability of various system responses are investigated by observing the perturbed response attractors in Poincare maps under the presence of external noise. The additive noise is simulated by Gaussian white noise. The cascade from a periodic response to a chaotic response is also investigated by comparing both unperturbed and perturbed bifurcation diagrams. The piecewise-linear system is found to have various types of responses including monochromatic, periodic, and also chaotic responses. The perturbed bifurcation reveals that the path to chaos is smeared and becomes unclear, and some portion of the range of long periodicity becomes unaccessible, veiling the long period mode of the responses, due to the external noise with high intensity.
Free Vibrations of Horizontally Curved Beams with Variable Curvature
Lee, Byoung-Koo ; Mo, Jeong-Man ; Oh, Sang-Jin ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 837~837
The differential equations governing free, out-of-plane vibrations of linearly elastic curved beams with variable curvature are derived and solved numerically for parabolic curved beams with both clamped ends. The frequencies predicted by present study are nearly identical with those by SAP 90, and also the frequencies of this study and experiment agree quite well each other. Frequencies, mode shapes and cross-sectional stress resultants we reported. The numerical methods presented here for computing frequencies and mode shapes are efficient and reliable.
A Mathematical Model for the Analysis of Chloride Ion Intrusion into Concrete Structure
Kim, Eun-Kyum ; Shin, Chee-Burm ; Cho, Won-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 845~845
In order to predict the onset of the corrosion of steel bars in concrete, a mathematical model including the diffusion of chloride ion in aqueous phase of pores, the adsorption and desorption of chloride ions to and from the surface of solid phase of concrete, and the chemical reaction of chloride ions with solid phase was established. Finite element method was employed to carry out numerical analysis. The chlorides penetrating through the wall of concrete structure from the external environment and the chlorides contained in the concrete admixture were confirmed to be two important factors to determine the onset of corrosion of steel bars. Even after the coating of the surface of a concrete structure to restrain the corrosion of steel bars, it was found that the concentration of chloride ions in aqueous phase remained above a threshold level causing the corrosion of bars for a certain amount of time.
A Study on Physical Properties of Concrete Contatining Natural Zeolite
Lee, Chang-Yong ; Han, Jae-Young ; Choi, Jae-Jin ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 855~855
Natural zeolite is deposited plentifully in domestic and is available at low cost. This work was carried out to investigate the effect of natural zeolite as admixture for concrete. In the concrete test, the substitution rates of natural zeolite for cement were 5, 10, 15 and 20%. The concrete containing natural zeolite exhibited excellent strength characteristics and bleeding of concrete decreased with increasing natural zeolite amount. Slump value of concrete, however decreased with increment of natural zeolite amount. The result of concrete test showed that the optimum substitution rate of natural zeolite for cement was
in consideration of workability and compressive strength. On the other hand, concrete containing natural zeolite presented a tendency to acceleration of concrete setting. This results would be related to dealumination from zeolite structure in process of cement hydration.
Investigation of the Crack Distribution in Reinforced Concrete Structures Using a Nonlinear Bond Model
Han, Sang-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 867~867
A nonlinear bond stress-slip model, which accounts for changes in bonding behavior induced by nearby cracking in reinforced concrete structures, is proposed in this paper. Link elements are used to represent the concrete-steel interface. Link properties are modified as cracking forms transverse to the reinforcing steel. A nonlocal measure of damage is used to quantify crack formation and to transition bond behavior between two envelopes: 1) an outer envelope modeling bond conditions sufficiently far from cracking, and 2) an inner envelope modeling bond conditions at the face of a transverse crack. To investigate the effectiveness of this method, reinforced concrete bridge piers are analyzed using plane stress finite elements. The proposed model gives more discrete-like representation of distributed cracking than the conventional smeared crack finite element models.
Nonlinear Behavior of Reinforced Concrete Structures due to Bond-Slip and Tension-Stiffening Effects
Kwak, Hyo-Gyoung ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 875~875
This paper concentrates on the development of numeric models which can consider effectively the material nonlinearities, such as, concrete cracking and bond-slip appeared in proportion to an increase of applied load. To describe a cracking of which direction has been changed, the rotating crack model is adopted. A cracking criterion derived from fracture mechanics principles is used to remove the numerical instability which is dependent upon the used finite element mesh size. Moreover, a new reinforcing steel model including the bond-slip effect without taking the double nodes at one point is proposed based on the force equilibrium and matrix condensation technique in order to simulate the structural behavior of bond-slip which is important in the structures, i.e., shear walls and beam-to-column joints, etc. Finally, correlation studies between analytical and experimental results and parameter studies are conducted with the objective to estabilish the validity of the proposed models and identify the significance of various effects on the local and global response of reinforced concrete structures.
An Experimental Study on the Development of Glass Fiber Reinforced Plastic Bar for Using a Substitute of Steel Bar
Kim, Kyoung-Soo ; Ko, Young-Zoo ; Bae, Ju-Seong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 889~889
This paper investigates the performances of GFRP bar and its possibility for using a substitute of steel bar. GFRP bar was made with introducing the glass fiber into GTR added UPE. We carried out the tensile test of GFRP bar and steel bar and out the three point bend test, bond-test and fracture energy measurement on the GFRP bar reinforced concrete and steel bar reinforced concrete. The GFRP bar was execllent as comparison with steel bar in the contribution to the energy absorption and the ductility of concrete. But its tensile, bond and bend strengthes were comparatively small. In order to improve these defects, we judged that glass fibers in GFRP bar must be completely adhesive one another by the impregnating glass fibers into UPE.
The Dynamic Behavior of Highway Bridge Due to The Braking Action of a Moving Vehicle in 3D
Kwark, Jong-Won ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 897~897
Dynamic behavior of the bridges subjected to braking action of vehicles is investigated using a bridge model simulated by 3 dimensional frame and plate elements, and interaction of vehicle model with nonlinear suspension devices in bridge-vehicle system are also considered. Tractor-trailer type HS20-44 is used for this study. Dynamic response of the bridge in the vertical direction are investigated considering the effects of offset between superstructure (slab, girder and cross beam) and the substructure (bearing and pier). A new way of considering braking action on bridges using speed-dependent braking function is introduced. Various parametric studies are performed using three types of vehicle and bridge models. The result of the study shows that the dynamic effect of offset between slabs, girders and bearing devices is very important on the vertical behavior of the bridges under the braking action of vehicles. Dynamic magnification factor (DMF) increases as distance from the center of wheel loads to the measured girder increase because of moment arm action about inertia during dynamic behavior of the bridge. Maximum DMF using the step-type braking function can be larger than that used with the speed-dependent braking function regardless of the bridge model. The magnitude and trend of DMF using the two functions were very different between the case when the braking action of the vehicle was activated before and after entering the bridge Rolling action of vehicle models had negligible effects on the vertical response of the bridges.
Direct Design of Semi-Rigid Frame
Kim, Seung-Eock ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 909~909
This paper presents a direct design method of semi-rigid frames. The method allows a very convenient design process because it does not require the K-factor calculations and the separate member capacity checks after analysis of structural system. It can capture the geometric, material, and connection nonlinearities which influence the behavior and the strength of the semi-rigid frame. The strength predicted by the proposed method is well compared with the test. A design example is provided fur a two-story four-bay semi-rigid frame. A new generation of codes is expected to adopt this convenient and practical methodology.
The Effects of Soil-structure Interaction on the Seismic Response of Structures due to Torsional Unbalance
Song, Ki-Bum ; Lee, Nam-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 917~917
For many structures the severity of an earthquake may be lowered dramatically by considering the flexibility of the supporting subgrade medium. For a torsionally unbalanced structure, when a transverse mode is coupled to a rotational mode, dynamic amplification of the torsional component will dominate the seismic response because of structural asymmetry and low damping. A seismic Soil-Structure Interaction (SSI) of a typical nuclear power plant building with a moderate torsional unbalance will be analyzed to demonstrate that by taking into account the flexibility of soil underneath the structure, the response peak at floors due to the coupling of transverse mode and torsion mode will be flattened or even eliminated.
A Numerical Simulation Study on Assessing Damage in a Bridge Using Modal Data
Shin, Soo-Bong ; Koh, Hyun-Moo ; Nam, Hyo-Seung ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 925~925
The present paper introduces a bridge assessment method by a system identification using modal data, and demonstrates the efficiencies of the method by comparing it with the widely used conventional assessment methods: i.e. the method of comparing the natural frequencies and the method of comparing the measured modal displacements. A new idea of the proposed SI method is to consider a proportional constant to the sum of the stiffness matrices in the same group as the parameters. In the numerical simulation study a two-dimensional Gerber truss model for the collapsed Sung-Soo Grand Bridge is used and the reduction in the sectional areas of the vertical members at the pinned connections is considered as damage. The assessment results by each method were compared and we could observe that the SI method is superior to the other conventional methods.
Design Versus Nonlinear Behavior of RC Hyperbolic Paraboloid Saddle Shell
Min, Chang-Shik ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 935~935
One case of pointwise limit 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 current design practice for reinforced concrete shells. Based on nonlinear analyses performed, the analytically calculated ultimate load exceeded the design ultimate load from
except for an analysis with relatively low tension stiffening.
. For these cases, the limit state design method gives a lower bound on the ultimate load. This shows the adequacy of the current practice at least for this saddle shell case studied. To generalize the conclusion many more designs-analyses are performed with different shell configurations.
Design of a Double Angle Strut Considering Buckling Strength
Choi, Seong-Joon ; Yoon, Chong-Yul ; Yoon, Soon-Jong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 947~947
A double angle member designed according to the AISC-LRFD (American Institute of Steel Construction - Load and Resistance Factor Design) specifications use effective slenderness ratio that accounts for the effect of the shear force. The theoretical bases for the equations in AISC-LRFD are due to Bleich (1952) and the improved versions are due to Aslani and Goel (1991). The experimental bases for the equations are due to Zandonini (1985). In this paper, in addition to the effect of the shear force, the effect of the lengths of the batten plates analyzed with the energy method is included in deriving a modified effective slenderness ratio for the design of double angle members. When a double angle member connected with batten plates buckles, bending moment and shear force are induced. The shear force induced by the bending moment increases the deflection and thus reduces the buckling strength. The strength of members designed according to AISC-LRFD shows significant difference from the recently reported experimental results. When the nominal strengths of double angle members designed based on AISC-LRFD and on the proposed modified effective slenderness ratio are compared with the experimental results recently reported by Briglevich (1992), the results by the modified equations show closer agreement.
Stochastic Analysis of Chaotic Responses of a Piecewise-Linear System
Mha, Ho-Seong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 957~957
Probabilistic characteristics of chaotic reponses of a piecewise-linear system under stochastic excitations, which is described as the harmonic excitation with additive Gaussian white noise are examined. The statistical properties of a random process are evaluated based on ensembles obtained from realizations consisting of response processes of the system. Realizations are calculated by direct numerical simulations combined with Newton method which is used to pinpoint the exact positions when the system is crossing the critical locations. The stationarity and ergodicity of the random process consisting of Poincare sampled points of system responses are examined by evaluating and observing the distribution of ensembles, first order probability density functions, ensemble averages and autocovariances. By observing the dependency of the autocovariance on sampling time and time interval, the staitionarity can be determined. Stochastic processes of chaotic responses of the piecewise-linear system under stochastic excitations are found to be weakly stationary, and the sample mean of the process is found to be ergodic.
Experimental Diagnosis of Dynamic Behavior of Simply Supported Grillage System
Jeon, Jun-Chang ; Chang, Dong-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 969~969
Dynamic test was conducted on simply supported beam and grillage system to investigate the dynamic behavior of short-span steel bridges which are regarded as grid in general. For each specimen, the characteristics of the dynamic response were determined in frequency domain using the acceleration measurements. The estimated dynamic parameters of simply supported beam are evaluated in term of locations of both impact and reference accelerometer. Based on the experimental data on gillage system, it is found that deciding of the dynamic parameter is not easy compared to simply supported beam and that dynamic behavior is significantly influenced by location as well as quantity of transverse members. Also, mode shape is found to give good indications of the change of supporting condition in grillage system.
Implementation Strategy for 3-D Computer Integrated Construction
Kwan, Oh-Sung ; Lee, Yong-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 979~979
The term Computer Integrated Construction (CIC) can be defined as an emerging project management tool needed to ensure successful construction projects. It is a system that integrates relevant construction project information throughout a project life cycle through the use of computers thereby integrating functional characteristics of individual project management subsystems. CIC ensures supply of timely and up-to-date information to all project participants by sharing information at the central level. This paper introduces current technology in information standards for product model data exchange, object-oriented technology, and open system which enable CIC and proposes a method through which it can be achieved. The implementation of research results and current computers and information technology will enable CIC and the construction industry will benefit from the use of a more efficient project management system.
A Study on the Integrated Construction Management Information Model (I) - Focused on Process Modeling -
Shin, Jhin-Woo ; Lee, Yong-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 991~991
A construction project entails involvement of multiple disciplines and functional groups throughout its life-cycle. While computer tools have been applied to assist in the performance of each function, the functional relationships among the disciplines and the flow of information throughout a project life-cycle that necessitates information sharing is not realized in the system. This research presents an analysis of project estimating, project planning and project management processes and how information flows with time. The research revealed several facets of instances where segregation/isolation of information occurs that hinders interactive communication among the sub-systems and disciplines. The research finally proposes the use of a common denominator of information representation that fosters efficient communication among the project function groups and also enables integration of many sub-systems currently in use.
A Study on the Integrated Construction Management Information Model (II) - Focused on Information Classification -
Shin, Jhin-Woo ; Lee, Yong-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 1003~1003
A construction project entails involvement of multiple disciplines and functional groups throughout its life-cycle. While computer tools have been applied to assist in the performance of each function, the functional relationships among the disciplines and the flow of information throughout a project life-cycle that necessitates information sharing is not realized in the system. This research performs a study on the Integrated Construction Management Information Model in terms of the standardized common denominator which will, in turn, prevent segregation/isolation of information. The research results foster efficient communication among construction management functions through the integration of cost, schedule, organization, and specification information.
Aerodynamic Analysis of a Single Train Running in a Tunnel
Kim, Heuy-Dong ; Lee, Young-Dai ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_6, 1997, Pages 1015~1015
As a high-speed train enters a tunnel, a compression wave is generated end of it due to the piston action of train. The compression wave propagates along the tunnel and reflects 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 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 structures including a ventilation system and a shunting station inside the tunnel and to improve the comfort of the passengers in the train. In the present study, the pressure transients were calculated numerically for a wide range of train speed and compared with the measurements at the real tunnels. The results showed that the predicted pressure transients are well agreed with the measurements. The peak pressure fluctuation and aerodynamic drag on the running train were also discussed in details.