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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 27, Issue 6D - Nov 2007
Volume 27, Issue 6C - Nov 2007
Volume 27, Issue 6B - Nov 2007
Volume 27, Issue 6A - Nov 2007
Volume 27, Issue 5D - Sep 2007
Volume 27, Issue 5C - Sep 2007
Volume 27, Issue 5B - Sep 2007
Volume 27, Issue 5A - Sep 2007
Volume 27, Issue 4D - Jul 2007
Volume 27, Issue 4C - Jul 2007
Volume 27, Issue 4B - Jul 2007
Volume 27, Issue 4A - Jul 2007
Volume 27, Issue 3D - May 2007
Volume 27, Issue 3C - May 2007
Volume 27, Issue 3B - May 2007
Volume 27, Issue 3A - May 2007
Volume 27, Issue 2C - Mar 2007
Volume 27, Issue 2A - Mar 2007
Volume 27, Issue 2D - Mar 2007
Volume 27, Issue 2B - Mar 2007
Volume 27, Issue 1D - Jan 2007
Volume 27, Issue 1C - Jan 2007
Volume 27, Issue 1B - Jan 2007
Volume 27, Issue 1A - Jan 2007
Selecting the target year
Safety Assessment on the Lengthened Composite Beam by External post-tensioning
Park, Yong-Gul ; Park, Young-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 461~470
This paper presents the result of an evaluation on the structural safety of a composite beam whose span length was increased by external post-tensioning. The experimental and analytical studies on the behavior of a post-tensioned composite beam were carried out. The dynamic behavior of a post-tensioned composite beam was also analyzed by using the finite element method. From the experimental and analytical results, it was verified that the experimental breakout strength of the composite beam whose span length was increased by post-tensioning were higher than the theoretical ultimate strength by about 20%. The analytical results presented in this paper indicate that rapid acceleration increase occurred with increasing span length with the adoption of external post-tensioning. From the experimental results of this study, the serviceability problem caused by the acceleration increase did not occur for span length increase up to 22.2%
Redundancy Evaluation of Two-Girder Continuous Bridge
Kim, Hong-Sik ; Kim, Sun-Myung ; Lee, Dae-Yong ; Kim, Seung-Eock ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 471~477
The redundancy of two-girder continuous bridge with nonredundant load path has been evaluated in this study. An efficient modeling technique has been proposed, and the redundancy of 2-span (2×60m) continuous bridges has been estimated using the commercial software, ABAQUS 6.5. The redundancy evaluation method used in NCHRP Report 406 was adopted to evaluate the redundancy of the bridge system with intact and damaged girders. Accroding to the result of this study, two-girder continuous bridge has sufficient redundancy.
A Comparison of the Structural Performance for GFRP Bridge Decks Applied to Vinyl ester and Polyester Resins
Jeong, Jin-Woo ; Park, Ki-Tae ; Lee, Young-Ho ; Hwang, Yoon-Koog ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 479~484
The researches about FRP for application in construction field have increased continuously. Specially, FRP bridge decks to improve short endurance period of steel and concrete bridge decks focused on this field of study. Until now, the structural performance and design standard of FRP bridge deck were insufficient due to lacking research period and variety of design variables as much as materials. In this study, to estimate of structural performance for FRP decks made of different resins respectively, flexural and buckling tests were performed for pultruded FRP decks under the equal fibers, fiber architectures, and dimensions. Additionally, the experimental results compared with numerical analysis results using ABAQUS.
Behavior of Innovative Prestressed Scaffolding(IPS) Wale Considering Construction Step
Kim, Sung-Bo ; Han, Man-Yop ; Kim, Moon-Young ; Jung, Kyoung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 485~492
In this paper, the behaviors and design procedures of innovative prestressed scaffolding (IPS) system are presented considering construction step. Tension-only cable element and compression-only truss element are used for the IPS cable and soil, respectively, in the F.E. analysis model. The effects of initial pretension, design and over-loaded earth pressure are investigated considering construction step. Axial forces and bending moments of IPS wale under initial pretension and design earth pressure are calculated. The combined stresses due to these axial force and bending moment were estimated to satisfy the design formula.
Aerodynamic Design Procedure of a Cable-stayed Bridge in Construction Based on a Buffeting Analysis
Choi, Sung-Won ; Kim, Ho-Kyung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 493~503
An aerodynamic design procedure is proposed for a cable-stayed bridge constructed by a balanced cantilever method. The buffeting responses due to wind turbulences are evaluated by a frequency domain response analysis utilizing flutter derivatives. The applicability of the proposed procedure is demonstrated in a numerical example for a composite cable-stayed bridge having a main span length of 500m. The maximum stress is found to exceed the allowable stress during construction and, therefore, the stabilizing cables are prepared to decrease the expected level of stress in pylon and girder. The optimal positions of stabilizing cables are determined considering overall behavior of the bridge structure through the whole construction process. The design guidelines of cable-supported bridges also recommended aerodynamic design process utilizing aeroelastic analysis technique. This paper proposed a design procedure and numerical example that may conform to the design guideline.
Applicability of Improved Modal Pushover Analysis in Seismic Performance Assessment of Multi-Span Continuous Bridges
Kwak, Hyo-Gyoung ; Shin, Dong-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 505~517
In the previous study, a simple but effective analysis procedure, named as an Improved Modal Pushover Analysis (IMPA) was proposed to estimate the seismic capacities of multi-span continuous bridge structures, on the basis of the modal pushover analysis which considers all the dynamic modes of a structure. Differently from other previous studies, IMPA maintains the simplicity of the capacity-demand curve method and also gives a better estimation of the maximum dynamic response of a structure. Nevertheless, its applicability has never been approved for multi-span continuous bridges with large differences in the length of their adjacent piers. This paper, accordingly, concentrates on a parametric study to verify the efficiency and limitation in application of IMPA through a correlation study between various analytical models including the Equivalent Single Degree Of Freedom (ESDOF) and Modal Pushover Analysis (MPA) usually used in the seismic design of structures. Based on the obtained numerical results, this paper introduces a practical guidance and/or limitation for using IMPA to predict the seismic response of a bridge effectively.
Estimation of Displacement Amplification Factors Considering Hysteretic Behavior of Structural System and Earthquake Characteristics
Song, Jong-Keol ; Jin, He-Shou ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 519~533
Displacement amplification factor can be used to estimate inelastic displacement demands from elastic displacement demands. The simple formula for displacement amplification factor considering hysteretic behavior of structural system and earthquake characteristics is proposed. And the effects of several parameters such as displacement ductility, strain hardening ratio, period, characteristics of earthquakes and hysteretic models for the displacement amplification factor are evaluated. Accuracy of the proposed formula is evaluated by comparing the displacement amplification factors estimated by existing and proposed formula with those calculated from inelastic time history analysis. The displacement amplification factors by proposed formulas provide a good agreement with those calculated by inelastic time history analysis.
An Aesthetic Bridge Design Approach for Beautiful Bridge Shapes
Kim, Nam-Hee ; Koh, Hyun-Moo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 535~546
Bridge appearances depend on design objectives toward which the bridge design proceeds. The bridge design objectives in Korea have been evolved according to timely demand and so do the resulted bridge appearances. In order to design a better looking bridge satisfying its proper function and securing structural safety, design concerns must be expanded one step further from the traditional engineering-oriented design to conceive aesthetic shapes. This paper investigates existing bridge design cases in Korea from an aesthetic viewpoint and performs an aesthetic evaluation for these bridges. Upon the results obtained through the investigation, a context-based design approach is proposed as a new bridge design paradigm, which integrates natural and environmental surroundings with a bridge to be built. It is expected that the proposed design approach will contribute to develop an aesthetic bridge design appropriate to Korea.
A Study on the Analysis of Shear Resistance for Cellular Structure
Jung, Sam-Dong ; Cho, Woo-Yeon ; Kim, Moon-Kyum ; Won, Jong-Hwa ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 547~552
It is rather difficult to apply finite element methods to a cellular structure due to the fact that it is a typical model of discontinuous structures, and there are no clearly established evaluation techniques regarding its shear resistance. This paper presents an analytical approach on the shear resistance force of fill materials in a cellular structure. In order to solve the issue, shear resistance analysis was performed by introducing displacement incremental analysis into the distinct element method, which enabled it to modelize not only continuous but also discontinuous structures for static and dynamic analyses. Also, friction angle and vertical load were selected as main factors influencing shear resistance, and their effect on shear resistance was analyzed through a case study. This approach has led to a conclusion in which the computational results are in close agreement with the experimental ones.
Flexural Behaviour of Circular Concrete-Filled Steel Tube Sections
Chung, Chul-Hun ; Kim, Jong-Suk ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 553~559
This paper presents a study of the flexural behaviour of 6000-mm-long circular concrete-filled steel tube section(CFT) beams tested to failure under pure bending. In this study, bending behaviour of circular concrete-filled steel sections with various different thickness and diameters were measured. A good ductility performance of the specimens was observed in all tests. A comparison of the experimental moment capacities with the values calculated from the formulae in the code showed that Eurocode 4, ACI-318, AISC-LRFD and Elchalakani formula considerably underestimated the flexural strengths of the specimens by 14, 23, 40 and 32%, respectively.
Continuity of PSC Composite Bridge with Precast Decks
Chun, Chul-Hun ; Hyun, Byung-Hak ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 561~568
In this Paper, a new concept as PnP (Precast Slab& Prestressed Concrete Girder) bridge system which uses precast slabs is suggested. This concept is that prestressed concrete girders have non-composite precast slabs during 2nd-prestressing after then precast slabs composite with prestressed concrete girders. Designed by the proposed design equation of a new shear connection, two span continuous beam (17 m@2=34 m) was fabricated to verify constructability and structural safety. A static test was performed to evaluate continuity at diaphragms and the negative moment region cracking. PnP bridge system show : Does not exceed design stresses during construction staging, confirms full composite action in continuous region and safety of negative crack moment. Fast and easy construction would be achieved using the suggested PnP bridge system
A Study on the Strengths of Compression Members Undergoing Buckling Interaction
Kwon, Young-Bong ; Kim, Nak-Gu ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 569~578
The ultimate strengths of compression members composed of thin-walled steel plates is dependent on the width-thickness ratio of plate elements and the member slenderness. If the component element has a large width-thickness ratio, an elastic or inelastic local buckling may occur first and be interacted with the overall buckling. The local buckling causes a negative effect on the column strength. In this paper, a series of compression tests performed on welded H-section and C-section columns fabricated from SM400 steel plate of thickness 6.0 mm is described. The ultimate strength and performance of the compression members undergoing the nonlinear interaction between local and overall buckling were investigated experimentally and theoretically. The compression tests indicated that the interaction has a negative effect on the ultimate strength of thin-walled welded steel section columns. The allowable stress of the sections with buckling interaction can not be predicted properly by the Korean Highway Bridge Design Specifications. The Direct Strength Method, which was newly developed and adopted as an alternative to the effective width method for the cold-formed steel sections recently by NAS (AISI, 2004) and AS/NZS4600 (2005), was calibrated for the application to the welded steel sections by the experimental and numerical results. The paper proposes the effective width method and the Direct Strength Method to predict properly the ultimate strength of welded steel section columns whether the local buckling and overall buckling occurs nearly simultaneously or not.
An Experimental Study on Fatigue-Bond Behavior of RC Structures Considering Reinforcement Corrosion
Choi, Seung-Won ; Jung, Ha-Tae ; Kim, Zi-Sang ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 579~584
It is more realistic that steel corrosion and fatigue loading act on reinforced concrete structures simultaneously. So, this study focuses on the bond-slip behavior under fatigue loading and reinforcement corrosion state. The main variables are reinforcement corrosion rate and level of stress. From the results of this study, until it occurs crack, a maximum bond strength increases and corresponding slip decreases with steel corrosion under monotonic loading. And as the level of stress is estimated on maximum monotonic load based on 0% steel corrosion rate, the fatigue life increases with steel corrosion rate. But after it occurs crack, maximum bond strength and corresponding slip decrease and the fatigue resistance almost loses But a slip at failure under fatigue loading is almost same one under monotonic loading Based on results of this study, a S-N curve is suggested with base on 0% corrosion rate until it occurs crack.
Unit Weight and Compressive Strength of Cement Mortars Using Crushed Sand Under Sulfate Attacks
Kim, Myung-Sik ; Baek, Dong-Il ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 585~591
The aim of this study is to estimate characteristic of compressive strength and unit weight when cement mortars using crushed sand under sulfate attacks. Besides tests have been performed using river sand and crushed sand, respectively. The cement mortars were made with replacement ratios of silica fume and fly ash. The cement mortar were immersed in fresh water, 10% sodium sulfate solution, 10% magnesium sulfate solution, and seawater for 28days, 60days, 90days and 180days. This study, investigate change of compressive strength and unit weight of cement mortars about immersion time and replacement of mineral admixtures. Additionally SEM and EDX analysis was performed to identify the microstructure under sulfate solution. It was observed from the test results that the cement mortar using crushed sand was found to have a good resistance against sulfate compared with river sand.
Experimental Investigation of Fundamental Bond Mechanisms of GFRP Rebar with Various Surface Patterns
Moon, Do-Young ; Sim, Jong-Sung ; Oh, Hong-Seob ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 593~600
In this study, the fundamental bond mechanisms of various surface type for GFRP rebars were mentioned in terms of pullout force vs. relative slips of loaded and free end. The ribbed, braided and covered type of GFRP rebar were used for experimental program. The effect of surface deformations on bond mechanisms was investigated. For the ribbed type of GFRP rebar, the effect of an increment on amounts of milled glass fibers in ribs on bond mechanisms was also investigated. The results demonstrated that for ribbed and braided type of GFRP rebars the bearing resistance and frictional resistance of surface deformation dominated bond performance with concrete, respectively. Moreover, for covered type of GFRP rebar the bond was significantly affected by the adhesive between the core and surface covered layer. In addition, the bearing resistance of the ribbed type of GFRP rebar could be marginally improved by increasing amounts of milled glass fibers in ribs.
Study on the Carbonation Properties of Fly Ash Concrete by the New Rapid Carbonation Experimental System
Yoo, Sung-Won ; Bang, Gi-Sung ; Jung, Sang-Hwa ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 601~607
Carbonation is one of the most important factors of the concrete deterioration resulting in the steel corrosion in concrete. Nevertheless, the experimental data for the study of the concrete carbonation have not been sufficiently accumulated because the carbonation of concrete is a long-term phenomenon. In this study, the newly-developed rapid carbonation test by the usage of the vacuum equipment has been used to observe the carbonation behaviors of concretes made of portland cement and of fly-ash cement. Experimental results showed that concretes with 0.45 and 0.6 w/c had the carbonation depth of 103% and 138%, respectively, comparing to that of 0.4 w/c. The carbonation depths calculated by an analytical model were deeper than the experimental results and the deviations increased with the increase of the water to cement ratio. It was also observed that the carbonation depth rapidly increased with the increase of fly-ash replacement. Consequently, the rapid carbonation test provided experimental results in a shorter time than the conventional carbonation tests, and it is expected that these experimental data and the further study by the new rapid carbonation test will contribute to the future studies of concrete carbonation.
Bond Properties of Synthetic and Steel Single Fiber in High Strength Cement Based Composites
Won, Jong-Pil ; Park, Chan-Gi ; Kim, Yun-Jeong ; Park, Kyung-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 609~616
In this research, the bond performance of steel and synthetic fiber in high strength cement based composites including bond strength, pullout energy, etc., are presented. Pullout test were conducted to evaluate the bond performance of steel and synthetic fiber in high strength cement based composites in accordance with the JCI(Japan Concrete Institute) SF-8. Experimental test result showed that the pullout load vs slip behavior of crimped type synthetic fiber has large pullout load and slip compared to steel fiber in high strength cement based composites. For the microscopic investigation of fiber surface after pullout test, there showed a scratches on the surface increased as the increase of compressive strength.
Material Modeling of Concrete for Chloride Diffusivity Considering Carbonation of Concrete
Yoon, In-Seok ; Kim, Eun-Kyum ; Lee, Chang-Su ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 617~625
Chloride diffusivity of concrete is a crucial material parameter in service life modeling and durability designing of marine concrete. Many researches to deal with the issue have been accomplished. The ways for approach were very various from the empirical solution obtained by experimental result to image analysis to consider multi-scale modeling. One of the simpliest ways is to express this as a multi-factor function from the practical point of view, however, the effects of affecting factors on the chloride diffusivity of concrete were ambiguous in previous studies. Furthermore, the majority of these researches have not dealt with this issue combined with carbonation of concrete, although carbonation can significantly impact on the chloride diffusivity of concrete. The purpose of this study is to establish a fundamental approach to compute the chloride diffusivity of (non)carbonated concrete. The chloride diffusivity of concrete should be defined, based on the engineering and scientific knowledge of cement and concrete. The affecting parameters for chloride diffusivity are diffusivity in pore solution, tortuosity, micro-structural properties of hardened cement paste, volumetric portion of aggregate, and so on. These are taken into account in the calculation of the chloride diffusivity of noncarbonated concrete. For carbonated concrete, reduced porosity due to carbonation is calculated and this is used for calculating the chloride diffusivity. The results are compared with experimental data and published study.
Enhenced Fire Resistance and Mechanical Properties of Hybrid Fiber Reinforced Concrete for Underground Space Concrete Structures
Won, Jong-Pil ; Park, Kyung-Hoon ; Park, Chan-Gi ; Lee, Sang-Woo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4A, 2007, Pages 627~633
This study evaluated the mechanical properties and fire resistance of hybrid fiber reinforced concrete for tunnel and underground concrete structures. This research added the steel fiber for the enhance of the flexural performance and the polypropylene fiber added to improve the fire resistance. This studies were conducted with experiments of compressive, flexural and fire resistance to evaluate the performance of hybrid fiber reinforced concrete. Specially, this studies mixed the polypropylene fiber to have each other different diameter and length with the steel fiber and maximized the mechanical performance and fire resistance. Test results shows that the hybrid fiber reinforced concrete with the polypropylene and steel blended fiber obtained an enhance of the mechanical performance and protect of spalling.