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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 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
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Analytical Study for the Creep Effect on the Time-Dependent Behavior of Prestressed Concrete Bridges
Lee, Jae-Seok ; Choi, Kyu-Chon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 131~140
An analytical study for the creep effect on the time-dependent behavior of the concrete beams and the PSC (prestressed concrete) bridge structures is presented. Since creep of concrete is one of the most important factors influencing the time-dependent behavior of the concrete structures, numerically efficient creep model, which can accurately predict the deflections and the stresses of the concrete structures at all load levels through their life cycles, is important. The creep models proposed by the ACI committee 209 (92) and the CEB-FIP model code (90) are used in this study. The recursive formulas derived from the integral equations based on the three assumptions regarding the variation of stresses and material parameters over each time step are used to calculate the creep strain increments over the time steps. These creep strain integration schemes are integrated in the nonlinear analysis program of the PSC frames developed by the authors. Using the integrated time-dependent nonlinear analysis program, comparative study on creep analyses of the concrete cantilever beams using the different recursive formulas is conducted, and the creep effects due to the ACI 209 (92) and the CEB-FIP (90) model on the time-dependent behaviors of the segmentally erected PSC bridge and the PSC cable-stayed bridge are compared in detail.
Prediction of Shear Strength for Reinforced Concrete Corbels using Shear-Friction and Strut-Tie Models
Yun, Young-Mook ; Lee, Won-Seok ; Jeong, Chan-Haek ; Kim, Byung-Hun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 141~155
The reinforced concrete corbels are used extensively in precast concrete constructions to support primary beams and girders. Because of the prevalence of precast concrete, the design of corbels has become increasingly important. The reinforced concrete corbels tend to fail in several modes. The most common of which are the yielding of main tensile reinforcement, the crushing or splitting of the compression strut, the shearing failure along the column face, and the localized bearing failure under the loading plate. Because of these various failure modes, the rational analysis and design of reinforced concrete corbels are difficult. In this study, the characteristic features of the currently used analysis and design methods of reinforced concrete corbels, i.e, the ACI 318-05 design code implementing the shear-friction model and the softened and nonlinear strut-tie model approaches implementing the truss model, are introduced. In addition, the appropriateness of each model is examined through the strength evaluation of 19 normal and high strength reinforced concrete corbels tested to failure.
Analysis of Temperature Distribution and Variation in Inground LNG Storage Tank under Long Term Operation
Kim, Young-Kyun ; Kim, Ji-Hun ; Lee, Kang-Won ; Yang, Young-Myung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 157~164
In-ground type LNG storage tank is constructed below the ground level except its roof, and has a slurry wall bearing soil and water pressure to store LNG in safe condition. During the long term operation, soil freezing occurs around the in-ground storage tank despite the insulation provided inside of the concrete tank due to the cryogenic temperature of LNG. This study compares the result of FE analysis and measured data to investigate the temperature distribution and variation in and outside the LNG tank. In order to validate the design documents, boundary conditions and material properties for FE analysis have been taken from the design documents for tank construction. The comparative observation between analyses and measurements has revealed that the temperature variation of concrete structure and soil is predictable and the results are applicable to designing the in-ground storage tank.
Estimating Tensile Force of Hangers in Suspension Bridges Using Frequency Based SI Technique: I. Theory
Park, Tee-Hyo ; Moon, Seok-Yong ; Joo, Hwan-Joong ; Kim, Byeong-Hwa ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 165~172
Hanger cables in suspension bridges have a particular form - two parallel hanger cables are tied by a horizontal clamp. Hence, it is difficult to estimate the accurate tension of a hanger using the existing frequency-based method based on the simple mathematical model of a single cable. To resolve this problem, in this paper, a frequency-based system identification thechnique is adopted. The complex behavior of the hanger cables has been identified by the aid of a three dimensional finite element analysis. In conjunction with the system identification algorithm and the finite element analysis, tension and other flexural rigidities of the hanger cable has been identified by a proposed approach. To verify the proposed technique, a set of various numerical verifications have been conducted. Finally, the results from the proposed approach have been compared with those from the exising technique.
Estimating Tensile Force of Hangers in Suspension Bridges Using Frequency Based SI Technique: II. Field Applications
Kim, Byeong-Hwa ; Moon, Seok-Yong ; Bae, In-Hwan ; Park, Tae-Hyo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 173~179
This paper introduces a field application of a newly proposed tension estimation method for a double hanger cable system in suspension bridges. As described in the accompanying paper, the method is based on the frequency-based system identification technique in conjunction with a finite element analysis. A set of field modal testing has been completed to measure a set of the natural frequencies and the mode shapes of hanger cables in the Yong-Jong Grand Suspension Bridge. From the measured data, the interesting dynamic characteristics of double hanger cable system due to a clamp have been revealed. Next, the feasibility and applicability of the proposed method are examined for the field data. The results are compared with those of the previous study. The estimated tension of the proposed approach is similar to that of the existing method if the length of hanger cable is relatively long. However, a significant difference has been found in the case of relatively short hanger cable system.
Shear Buckling Strength of Trapezoidally Corrugated Steel Webs
Yi, Jong-Won ; Youm, Kwang-Soo ; Moon, Ji-Hoo ; Lee, Hak-Eun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 181~186
This paper deals with the shear buckling strength of trapezoidally corrugated steel web, which is expected to be increasingly used at the web of hybrid girders and plate girders. Trapezoidally corrugated plates can be buckled by three different shear buckling modes: local, global, and interactive buckling mode. Different buckling strength equations are provided for each buckling mode. However, the comparison of proposed buckling formulae shows discrepancies between them, and it is suggested that some of the available formulae unconservatively predict the bucking strength. Therefore, the geometric limit condition and the equation for conservative estimation of shear buckling strength are suggested. The suggested shear buckling strength is compared with the published tests results and the results of nonlinear finite element analysis to examine the validity.
Controller Design using Pole Placement Method with Bilinear Transform
Park, Won-Suk ; Koh, Hyun-Moo ; Park, Kwan-Soon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 187~192
For the design of H∞ controller which provide target damping performance, a pole placement method using bilinear transformation has been studied in this paper. The relationship between the parameters in the bilinear transformation and the pole locations of the closed loop system is analytically derived for a single degree of freedom system. And a method for of determination of the parameters and pole locations is proposed for guaranteeing the target damping performance. The parameters which are used in the bilinear transformation and the inverse transformation determine the size and the location of a transformed plane. This eventually leads to obtain a proper pole location in a complex plane, and as a result, target performance can be achieved. Example designs are performed by the proposed method with use of an earthquake excited structure and comparative numerical results are presented.
A Study on the Composite Behavior according to Height Change of Lattice bar in LB-DECK
Lho, Byeong-Cheol ; Cho, Gyu-Dae ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 193~200
The experimental investigations for the flexural strength and composite behavior of a bridge deck with precast concrete panel form work called LB-DECK based on the height change of lattice bar from 135 mm to 70 mm to increase ultimate strength and construction ability. Two types of beams with LB-DECK were tested. Tested beams with 70 mm lattice bar have 17.1% average ultimate strength than 135 mm lattice bar due to the increase of moment arm. And the cracks are propagated from the bottom of LB-DECK to the bottom of plate with continuous pattern, and the upper part of LB-DECK is in tension. From the monitoring of crack patterns and neutral axis changes, a composite behavior is observed between LB-DECK and slab concrete.
Analysis of Structural Characteristics of Single Standing Pile collided by Small Ship
Bae, Yong-Gwi ; Lee, Seong-Lo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 201~207
In the ship collision with protection system, a range of working or dissipated collision energy is different from a kind of ship or property of pile, and it becomes an important factor in design. In this study, ship collision analysis with rigid wall is performed as preparatory work for collision analysis and its result is compared with empirical formula of AASHTO and EUROCODE. Also, a range of energy that protection system is able to absorb is roughly estimated by performance displacement based analysis for pile. From this analysis, behaviors of single standing pile and energy dissipation mechanism by impact position are known. Because little information is available on the behavior of the inelastic deformation of materials and structures during the type of dynamic impacts associated with vessel impact, assumptions based on experience and sound engineering practice should be substituted. Therefore more researches on the interaction between ship and structures are required.
Computer-aided Maintenance Management System for Coating Condition of Steel Bridge using Pattern Recognition Techniques
Lee, Jong-Min ; Kim, Whoi-Yul ; Cheong, Hei-Moon ; Lee, Chan-Young ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 209~215
As the number of steel bridges which are important SOC of nation has been increased, the requirement of the efficient management technique of steel bridges is increased. The management of steel bridge is composed of structural side and anti corrosion side roughly. In this paper, we introduce an Automatic Coating Inspection and Management System (ACIMS) that diagnoses coating condition of steel bridge automatically using image processing and pattern recognition technique. The system assesses coating of steel bridges using color information and properties of deteriorations, and manages the data of inspection for maintenance. The proposed system is consisted of two modules: Server and client side. The client has the inspection module that detects rust area and peeled region in image by non-parametric modeling of the color distribution. The server manages the data of the inspection results and supplies useful information to user. By using the system, we can avoid errors which are produced by the lack of experience or knowledge of inspector, and reduce time and costs. As the ACIMS integrates the enormous information of steel bridges efficiently, it gives advantages in maintaining coating of steel bridges in both economical and technological side. Through the experiment, the ACIMS was tested on pictures which are obtained by local worker and accuracy which was calculated by comparing the inspection results with those which were obtained by experts is 92.55%.
Dynamic Performance Evaluation of Crash Cushion System Using Cylindrical Steel Nested Tubes
Woo, Kwang-Sung ; Shin, Young-Shik ; Joo, Gi-Chul ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 217~225
The merit of conventional cylindrical metallic tube is to absorb kinetic energy in a controlled and irreversible manner so that damage to people, cargo with machinery is minimized. The laterally loaded cylindrical metallic tubes have formed a cluster of energy attenuators in existence to date such as CIAS(Connecticut Impact Attenuation System). This CIAS system is partly due to its easy constructibility and largely due to the excellent energy dissipation characteristics. However, this device designed for the worst case of a high speed impact involving a heavy vehicle might prove to be stiff for the light vehicles in terms of causing structural damage or decelerations beyond human tolerance levels. Alternatively, the nested tube system with thin walled component tubes can be used with the inner tubes being progressively activated as the crush progress. In this study, Taguchi method has been used to determine the optimal tube cluster system. The dynamic performance of the impact attenuation system with cylindrical steel nested tubes will be verified for not only a single unit system but also a cluster system by computer simulation to check whether it may be extended to practical device in the field. It is noted that the nested tube system shows better energy absorption characteristics than the conventional CIAS.
Seismic Fragility Analysis of Continuous Bridge in terms of Support Condition
Lee, Dae-Hyoung ; Park, Chang-Kyu ; Chung, Young-Soo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 227~236
Fragility analysis is a useful tool for predicting the probability of damage induced by the probable earthquake. This paper presents the probability of damage as a function of peak ground acceleration and estimates the probability of five damage levels for the pier of prestressed concrete (PSC) bridge subjected to given ground acceleration. A total of 100 artificial earthquake motions were generated and nonlinear time domain analyses were performed for the damage states of the pier of PSC bridge structures. These damage states are described by two practical factors: the displacement ductility and curvature ductility, which are mostly influencing on the seismic behavior of RC bridge piers. Using the damage states and ground motion parameters, five fragility curves for the pier of PSC bridges with three types of bearing were constructed assuming a log-nomal distribution. It was found that there was a significant effect on the fragility curves due to the amount of confinement steel and support conditions.
Shear and Residual Strength Evaluation of Perfobond Rib Shear Connector
Ahn, Jin-Hee ; Kim, Sang-Hyo ; Koo, Hyun-Bon ; Kang, Gyun-Hee ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 237~245
This paper deals with the static shear strength and residual strength after cyclic loading of perfobond rib shear connectors. A total of eighteen push-out specimens with perfobond rib shear connectors were fabricated and a series of static and residual push-out tests were conducted. Then, the influences of hole crossing bars, concrete dowel, and cyclic loading on the shear strength were evaluated experimentally. As a results of this study, it is proved that the concrete dowel action is charge of 65% in ultimate shear strength of perfobond shear connectors, and the hole crossing bars increase the shear strength of that in two times. Especially, at the time of failure of shear connectors, the hole crossing bars significantly increase ductility of load-slip behavior. According to the residual push-out tests applying two types of cyclic loadings, design load and 50% of design load specified in Korean Highway Bridge Design Code, the residual strength, which was drawn by static push-out test after cyclic loadings, of the specimens without hole crossing bars were reduced to 65% of ultimate strength. However, the residual strength of the hole crossing bars were not reduced significantly. Therefore, as the perfobond shear connectors are applied to the Bridges which are frequently subjected to the fatigue loadings, it is designable to install hole crossing bar in order to prevent reducing of shear strength by fatigue loadings.
Nonlinear Shear Deformation Effects on the Free Vibration of Skew Concrete Plates with Laminated Composite Face Plates
Lee, Sang-Youl ; Noh, Myung-Hyun ; Park, Tae-Hyo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 247~256
This study investigates nonlinear effects of the shear deformation on the free vibration of concrete plates with laminated composite face plates. In this paper, the mixed finite element method using Lagrangian and Hermite interpolation functions is adopted and a nonlinear high-order plate theory is used to skew concrete plates. The theory accounts for parabolic distribution of the transverse shear stress and requires no shear correction factors supposed in the first-order plate theory. The results in this study are compared with those of available literatures for the conventional and first-order plate theory. Sample studies are carried out for various layup configurations, skew angles, and geometric shapes of plates. The significance of the nonlinear shear deformation effects in analyzing complex skew concrete structures with laminated facings is enunciated in this paper.
Evaluation on Durability of Ultra-High Strength Cementitious Composites
Park, Jung-Jun ; Koh, Kyung-Taek ; Ryu, Gum-Sung ; Kim, Sung-Wook ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 257~263
In this paper, it was assessed on the durability of ultra-high strength cementitious composites (UHSCC) of the over 180 MPa of compressive strength through the test of chloride ion resistance, carbonation, resistance to freezing-thawing, permeability and pore distribution. In order to compare with UHSCC, normal strength concrete and high strength concrete were also tested. In conclusion, it shown that UHSCC are cleary superior to the durability performance of normal concrete and high-strength concrete in the case of resistance to chloride ion penetration and resistance to carbonation and also showed 100 durability factor in the freeze-thawing test with 600 cycles. From the examination about the watertightness and the pore distribution, it was found that the durability of UHSCC was improved because its hardened cement paste was organized closely. Therefore, If we apply UHSCC to structures in field, we will expect a long life cycled concrete structures because of improved durability performance.Keywards : ultra-high strength, cementitious composite, durability, compressive strength 180 MPa
Bond Properties of GFRP Rebar and High Strength Concrete with Steel Fiber Reinforcements
Won, Jong-Pil ; Park, Chan-Gi ; Kim, Hwang-Hee ; Lee, Sang-Woo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 265~270
The purpose of this study was to evaluate bond properties between high-strength concrete and GFRP reinforcing bar with steel fiber contents. Used amount of steel fiber was 20 kg/m3 and 40 kg/m3, and curing age was 1 day, 7 days and 28 days. In this research, a 13 mm diameter of GFRP reinforcing bar was applied. In compressive test results, the strength of concrete with steel fiber contents was appeared as 75 MPa~84 MPa in 28th day of curing age. Also, in the results of bond test, pullout load-slip behavior of GFRP reinforcing bar showed relatively increased process in which small rate of slip occurrence where early crack phase stared due to separation between main body of GFRP reinforcing bar and surface-treated section and rapid increase of pullout load than steel reinforcing bar. Surface investigation results of GFRP reinforcing bar after bond test also showed increased separation rate of surface shape part was significant when curing age and steel fiber contents were increased that most of surface rib was separated in 28 curing day with steel fiber of 40 kg/m3. Bond strength of GFRP reinforcing bar was increased as amount of steel fiber and curing age increased that increasing rate of bond strength in the same curing age was 9%~41% for each amount steel fiber applied.
Durability Evaluation of Concrete Using Ternary Blended Cement
Bae, Su-Ho ; Lee, Joon-Gu ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2A, 2007, Pages 271~276
Recently, physical properties of concrete containing ternary blended cement are actively being researched to improve durability, mobility, and etc. as well as strength increase of concrete. Especially, the concrete using ternary blended cement is being required to increase the resistance against the chloride ion penetration and sulfate of the concrete structures exposed to chloride attack. Thus, the purpose of this research is to propose the use of the concrete containing ternary blended cement as one of the counterplan for concrete structures exposed to chloride environment. For this purpose, the concrete containing ordinary portland cement (OPC) and ternary blended cement (TBC), respectively, were made for water-cement ratio of 37.5% and 41.5%, and then the durability such as the resistance against chloride ion penetration, corrosion of reinforcing steel, sulfate, and freeze and thaw were estimated for the concrete containing OPC and TBC, respectively. It was observed from the test that the durability of the concrete containing TBC was found to be much better than that of the case containing OPC.