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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 30, Issue 6D - Dec 2010
Volume 30, Issue 6C - Dec 2010
Volume 30, Issue 6B - Dec 2010
Volume 30, Issue 6A - Dec 2010
Volume 30, Issue 5D - Oct 2010
Volume 30, Issue 5C - Oct 2010
Volume 30, Issue 5B - Oct 2010
Volume 30, Issue 5A - Oct 2010
Volume 30, Issue 4D - Aug 2010
Volume 30, Issue 4C - Aug 2010
Volume 30, Issue 4B - Aug 2010
Volume 30, Issue 4A - Aug 2010
Volume 30, Issue 3D - Jun 2010
Volume 30, Issue 3C - Jun 2010
Volume 30, Issue 3B - Jun 2010
Volume 30, Issue 3A - Jun 2010
Volume 30, Issue 2D - Apr 2010
Volume 30, Issue 2C - Apr 2010
Volume 30, Issue 2B - Apr 2010
Volume 30, Issue 2A - Apr 2010
Volume 30, Issue 1D - Feb 2010
Volume 30, Issue 1C - Feb 2010
Volume 30, Issue 1B - Feb 2010
Volume 30, Issue 1A - Feb 2010
Selecting the target year
Optimal Design for Seismically Isolated Bridges with Frictional Bearings
Lee, Gye-Hee ; You, Sang-Bae ; Ha, Dong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 399~406
In this paper, the optimization of frictional bearings that applied to improve the seismic performance of conventional bridges were conducted. The nonlinear dynamic analysis of steel bridges and concrete bridges are carried out with the El Centro and artificial earthquake motions, and the reponses of the bridges were optimized by genetic algorithm. The object functions were considered with two parameters, such as shear forces and displacements at bearing, and the optimum object functions were searched by varying the weighting factors of the two parameters. As results, in case of the steel bridges, the optimum results were obtained when larger weight factor was imposed to the shear force. However, in case of concrete bridges, larger weight factor was need to the displacement for optimum results.
Development and Experimental Performance Evaluation of Steel Composite Girder by Turn Over Process
Kim, Sung Jae ; Yi, Na Hyun ; Kim, Sung Bae ; Kim, Jang-Ho Jay ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 407~415
In Korea, more than 90% of the total number of steel bridges built for 40~70 m span length is a steel box-girder bridge type. A steel box-girder bridge is suitable for long span or curved bridges with outstanding flexural and torsional rigidity as well as good constructability and safety. However, a steel box-girder bridge is uneconomical, requiring many secondary members and workmanship such as stiffeners and ribs requiring welding attachments to flanges or webs. Therefore, in US and Japan, a plate girder bridge, which is relatively cheap and easy to construct is generally used. One type of the plate girder bridge is the two- or three-main girder plate bridge, which is a composite plate girder bridge that minimizes the number of required main girders by increasing the distance between the adjacent girders. Also, for the simplification of girder section, the stiffener which requires attachment to the web is not required. The two-main steel girder plate bridge is a representative type of plate girder bridges, which is suitable for bridges with 10 m effective width and has been developed in the early 1960s in France. To ensure greater safety of two- or three-main girder plate bridges, a larger steel section is used in the bridge domestically than in Europe or Japan. Also, the total number of two- or three-main girder plate bridge constructed in Korea is significantly less than the steel box girder bridge due to a lack of designers' familiarity with more complex design detailing of the bridge compare to that of a steel box girder bridge design. In this study, a new construction method called Turn Over method is proposed to minimize the steel section size used in a two- or three-main girder plate bridge by applying prestressing force to the member using confining concrete section's weight to reduce construction cost. Also, a full scale 20 m Turn Over girder specimen and a Turn Over girder bridge specimen were tested to evaluate constructability and structural safety of the members constructed using Turn Over process.
Effects of Accelerated Thermal Aging on Dynamic Properties of Laminated Rubber Bearings
Oh, Ju ; Jung, Hie-Young ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 417~424
The dynamic properties of laminated rubber bearings used as isolators in structures could be significantly deteriorated because of the change of microstructure in rubber caused by thermal aging. As a result, a catastrophic failure of bridges and buildings unexpectedly occurs when they are subjected to earthquake attack. Here, the dynamic properties of laminated rubber bearings before and after different of compression-shear loading and repeated cycles loadings, ultimated failure test with thermal aging were first measured and compared to each other. The experimental results, the effects of thermal aging on the shear stiffness, energy absorption, and equivalent damping coefficient of laminated rubber bearings are investigated. It is found that the deterioration of dynamic properties of laminated rubber bearings caused by thermal aging is significant and should be taken into account in designing rubber bearings.
Evaluation of RVE Suitability Based on Exponential Curve Fitting of a Probability Distribution Function
Chung, Sang-Yeop ; Yun, Tae Sup ; Han, Tong-Seok ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 425~431
The phase distribution in a multi-phase material strongly affects its material properties. Therefore, a proper method to describe the phase distribution of a material is needed. In this research, probability distribution functions, two-point correlation and lineal-path functions, are used to represent the probabilistic phase distributions of a material. The probability distribution function is calculated using a numerical method and is described as an analytical form via exponential curve fitting with three parameters. Application of analytical form of probability distribution function is investigated using two-phase polycrystalline solids and soil samples. It is confirmed that the probability distribution functions can be represented as an exponential form using curve fitting which helps identifying the applicability of a representative volume element(RVE).
Study on Optimum Mixture Design for Service Life of RC Structure subjected to Chloride Attack - Genetic Algorithm Application
Kwon, Seung-Jun ; Lee, Sung Chil ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 433~442
A control of chloride diffusion coefficient is very essential for service life of reinforced concrete (RC) structures exposed to chloride attack so that much studies have been focused on this work. The purpose of this study is to derive the intended diffusion coefficient which satisfies intended service life and propose a technique for optimum concrete mixture through genetic algorithm(GA). For this study, 30 data with mixture proportions and related diffusion coefficients are analyzed. Utilizing 27 data, fitness function for diffusion coefficient is obtained with variables of water to binder ratio(W/B), weight of cement, mineral admixture(slag, flay ash, and silica fume), sand, and coarse aggregate. 3 data are used for verification of the results from GA. Average error from fitness function is observed to 18.7% for 27 data for diffusion coefficient with 16.0% of coefficient of variance. For the verification using 3 data, a range of error for mixture proportions through GA is evaluated to 0.3~9.3% in 3 given diffusion coefficients. Assuming the durability design parameters like intended service life, cover depth, surface chloride content, and replacement ratio of mineral admixture, target diffusion coefficient, where exterior conditions like relative humidity(R.H.) and temperature, is derived and optimum design mixtures for concrete are proposed. In this paper, applicability of GA is attempted for durability mixture design and the proposed technique would be improved with enhancement of comprehensive data set including wider range of diffusion coefficients.
Validity Evaluation of Effective Strength of Concrete Strut using Strut-Tie Model Analysis of Structural Concrete
Jeun, Chang Hyun ; Yun, Young Mook ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 443~462
The strut-tie model approach has proven to be effective in the ultimate analysis and design of structural concrete with disturbed regions. For the reliable analysis and design by the approach, however, the effective strength of concrete struts must be determined accurately. In this study, the validity of the effective strength of concrete struts, presented by the several design codes and many researchers including the author, was examined through the ultimate strength analysis of 24 reinforced concrete panels, 275 reinforced concrete deep beams, and 218 reinforced concrete corbels by using the conventional linear strut-tie model approach of current codes. The present study shows that the author's approach, resulting in an accurate and consistent evaluation of the ultimate strength of the panels, deep beams, and corbels, may reflect rationally the effects of primary variables including the types of strut-tie model and structural concrete, the conditions of load and geometry, and the strength of concrete in the strut-tie model analysis and design of structural concrete.
Precast Concrete Copings for Precast Segmental PSC Bridge Columns : I. Development and Verification of System
Kim, Tae-Hoon ; Park, Se-Jin ; Kim, Young-Jin ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 463~473
The purpose of this study was to investigate the performance of precast concrete copings for precast segmental PSC bridge columns. The proposed system can reduce work at a construction site and makes construction periods shorter. The precast concrete copings provides an alternative to current cast-in-place systems, particularly for areas where reduced construction time is desired. A model of precast concrete copings was tested under quasistatic monotonic loading. As a result, proposed precast coping system was equal to existing cast-in-place system in terms of required performance. In the companion paper, the experimental and analytical study for the performance assessment of precast concrete copings for precast segmental PSC bridge columns is performed.
Precast Concrete Copings for Precast Segmental PSC Bridge Columns : II. Experiments and Analyses
Kim, Tae-Hoon ; Kim, Young-Jin ; Lee, Jae-Hoon ; Shin, Hyun-Mock ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 475~484
The purpose of this study is to investigate the inelastic behavior of precast concrete copings for precast segmental PSC bridge columns and to provide the details and reference data. Twelve one-fourth-scale precast concrete copings were tested under quasistatic monotonic loading. In this study, the computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), was used. A joint element is modified to predict the inelastic behaviors of segmental joints. This study documents the testing of precast concrete copings for precast segmental PSC bridge columns and presents conclusions based on the experimental and analytical findings.
A Study on the Basic Development Length of GFRP Rebar With Ribs
Moon, Do Young ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 5A, 2010, Pages 485~493
GFRP rebar with ribs resemble those of deformed steel rebar was developed in 2005. It was reported that ribs of the GFRP rebar were sheared off due to the lower shear strength of polymer. In this study, the basic development length of the GFRP rebar was investigated through pull-out tests, models specified in ACI440.1R-03 and -06, and empirical model derived by Cosenza et al. (2002). As a results of pull-out tests, the critical embeddment length, which is defined as the length when failure mode is changed from pull-out to bar fracture, was 20 times of bar diameter for GFRP rebar and was 15 times for steel rebar. It is believed that the basic development of the GFRP rebar is 21 times of bar diameter, which is determined from the application of average bond strength into the model equation specified in ACI440.1R-03. Compared to the model equation in ACI440.1R-06, that in ACI440.1R-03 is recommendable for design purpose. The Cosenza et al.'s model underestimates the basic development length of the GFRP rebar.