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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 28, Issue 6D - Nov 2008
Volume 28, Issue 6C - Nov 2008
Volume 28, Issue 6B - Nov 2008
Volume 28, Issue 6A - Nov 2008
Volume 28, Issue 5D - Sep 2008
Volume 28, Issue 5C - Sep 2008
Volume 28, Issue 5B - Sep 2008
Volume 28, Issue 5A - Sep 2008
Volume 28, Issue 4D - Jul 2008
Volume 28, Issue 4C - Jul 2008
Volume 28, Issue 4B - Jul 2008
Volume 28, Issue 4A - Jul 2008
Volume 28, Issue 3D - May 2008
Volume 28, Issue 3C - May 2008
Volume 28, Issue 3B - May 2008
Volume 28, Issue 3A - May 2008
Volume 28, Issue 2D - Mar 2008
Volume 28, Issue 2C - Mar 2008
Volume 28, Issue 2B - Mar 2008
Volume 28, Issue 2A - Mar 2008
Volume 28, Issue 1A - Jan 2008
Volume 28, Issue 1D - Jan 2008
Volume 28, Issue 1C - Jan 2008
Volume 28, Issue 1B - Jan 2008
Selecting the target year
An Experiment on Redundancy in Continuous Span Two-Girder Bridge - Effects of Lateral Bracing
Park, Yong-Myung ; Joe, Woom-Do-Ji ; Hwang, Min-Oh ; Yoon, Tae-Yang ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 417~429
This paper presents an experimental result to evaluate the redundancy in continuous span two plate-girder bridges which are generally classified as a non-redundant load path structure. The experiments were performed when one of the two girders is seriously cracked. To estimate the effects of bottom lateral bracing on the redundancy, the experiment variable was considered as the bottom lateral bracing, and two 1/5-scaled bridge specimens with and without lateral bracing system were fabricated. The ultimate loading tests were conducted on the damaged specimens with an induced crack at a girder in the side span. The test results showed that the load carrying capacity of damaged specimen with bracing was about 1.2 times higher than that without bracing. To evaluate the redundancy in each specimen, numerical analysis was performed to calibrate the difference of dead load between the actual bridge and the test specimens. When the dead load calibration is considered, the results showed that a continuous span two-girder bridges have a reasonable redundancy even without lateral bracing. Especially, the level of redundancy is increased by about 1.8 times when the lateral bracing is provided.
Estimation of Extreme Wind Speeds in Southern and Western Coasts by Typhoon Simulation
Kwon, Soon-Duck ; Lee, Jae-Hyoung ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 431~438
An updated Monte Carlo procedure for Typhoon simulation is presented to estimate the extreme wind speed at typhoon prone southern and western coasts in Korea. The reconstructed wind field model for typhoon in this study is compared with measured typhoon data for validation. The fitness of the proposed probability distribution models for typhoon parameters are tested by using data for the typhoon passed near the specific site. The simulated maximum wind speed associated with various return periods along southern and western coasts indicate that the extreme wind speed gradually increases inversely according to latitude of the coast, and that the basic wind speeds given in Korea Bridge Design Code are excessive compared with present results.
The Analysis for Reinforced Concrete Beams Strengthened with Externally Unbonded Prestressed CFRP Plates
Park, Jong Sup ; Jung, Woo Tai ; Park, Young Hwan ; Kim, Chul Young ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 439~445
This paper suggests a modified bond reduction coefficient considering the average CFRP (Carbon Fiber Reinforced Polymer) strain concept for the unbonded prestressed CFRP plate strengthening system. The strengthened length and the pure bending length were seen to influence the variation of the strain of unbonded CFRP plate. Therefore, a new bond reduction coefficient considering such effect was suggested. Comparison with the experimental data revealed that the analytic results obtained by considering the proposed bond reduction coefficient were effective in estimating the strain of the unbonded CFRP plate in the CFRP plate prestressing system.
Debonding Failure Model for RC Beams Strengthened with Externally Bonded Prestressed CFRP Plates
Park, Jong Sup ; Jung, Woo Tai ; Park, Young Hwan ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 447~456
This paper suggests a modified debonding failure model for the externally bonded prestressed CFRP plate strengthening system. In order to reduce the error that may occur in the experimental results, statistical analysis of the experimental results produced by previous researchers was conducted to propose a debonding failure model. The experimental results of beams strengthened with bonded CFRP plates have made it possible to verify the debonding failure occurring before the final failure in the prestressing system. The corresponding strain increased with the effective prestress. Accordingly, the debonding failure model was modified by considering the effective prestress so as to fit with the CFRP prestressing system.
Ultimate Behavior of Compression Flange Stiffened by Shear Stud on Double Composite Steel Box Girder
Lee, Doo Sung ; Lee, Sung Chul ; Suh, Suk Koo ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 457~463
The longitudinal stiffener performs its role to increase the local buckling strength by making simple support upon compression flange. In the recent researches, it is investigated that compression flange with point supports on certain arrangement reveals the same strength with longitudinal stiffeners. From this results, it is predictable that shear stud could perform the role of longitudinal stiffener if shear stud embedded in concrete satisfies the requirement to point-support under yield stress of the compression flange. In this study, the researches were performed to investigate the optimally required arrangement space of longitudinal point-support for which the shear stud replacing the longitudinal stiffeners and simultaneously determine the required numbers and space of shear stud for completely composite behavior between compression bottom flange and bottom concrete on the double composite girder system.
Stability Design of Steel Frames considering Initial Imperfection based on Second-Order Elastic Analysis
Kyung, Yong Soo ; Lee, Chang Hwan ; Kim, Moon Young ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 465~474
Generally design of frame structures composed of beam-column member is accomplished by stability evaluation of each member considering the effective buckling length. This study selects a member of the smallest non-dimension slenderness ratio using the buckling eigenvalue calculated by the elastic buckling eigen-value analysis and axial force of the each member, and decides the initial deflection quantity reflected geometric and material nonlinearities from a suggested equation on the base of standard strength curve of Korea Bridge Design Code. Second-order elastic analysis applying the initial deflection is executed and the stability of each member is evaluated and decides ultimate strength. Through examples of eight-stories and four-stories plane frame structures, the evaluation of the stability is compared with the existing method and ultimate strength of the suggested method is compared with ultimate strength by the nonlinear inelastic analysis. Through these procedures, the increasing of effective buckling length by elastic buckling eigenvalue analysis is prevented from a new design method that considers initial imperfections. And the validity of this method is proved.
A Experimental Study on the Stiffness Characteristics of Elastomeric Bearings
Yoon, Hyejin ; Cho, Changbeck ; Kim, Youngjin ; Kwahk, Imjong ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 475~485
This paper intends to enhance the reliability and performance of domestic elastomeric bearings through the proposal of directions for the improvement of their stiffness regard to the Korean industrial standard KS F 4420 relative to the evaluation of design/fabrication/quality. Therefore, comparative analysis of the compressive elastic modulus, stiffness measurement method and performance evaluation method of KS F 4420 with those of Eurocode, Japanese bearing manual, and ISO code was performed, and measurement tests on the compressive stiffness and shear stiffness of common elastomeric bearings produced in Korea were conducted. The experimental results reveal that differences of about 20% and 13% occurred respectively for the compressive stiffness and shear stiffness according to the definition adopted for the stiffness. The measured values for the stiffness of the domestic elastomeric bearings were also verified to exhibit large deviation from the formula proposed by KS F 4420. Elastomeric bearings that does not have appropriate compressive stiffness required at the design can result in uneven deflection at supports of bridges and excessive stress in girders. Accordingly, the establishment of compressive elastic modulus formula and performance evaluation criteria fitted to the domestic circumstances through the execution of performance evaluation of bearings presenting diversified shapes and shape factors appears to be necessary for the domestic bearings to meet the performance required in design.
Techniques of Optimizing the Launching Nose under Conditions of Minimizing the Launching Bending Moment
Choi, Hang Yong ; Suh, Suk Koo ; Oh, Myung Seok ; Oh, Sae Hwan ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 487~495
The behavior of nose-deck system during launch was examined by three dimensionless launching parameters, such as the relative flexural stiffness, the relative nose weight, and the relative nose length. The techniques of optimizing the launching nose were illustrated and equations of relationship between relative nose weight and relative nose length were derived under minimum conditions of the launching negative and positive moment. Equations of maximum positive and negative moment were suggested under the conditions. The optimum design method of the launching nose was proposed in launched continuous girder bridges. It was found that the ideal launching nose was to design that with the relative nose weight of 0.167 and the relative nose length of 0.836 to minimize absolute values of the positive and negative moment during launch.
Shear Design of Trapezoidally Corrugated Steel Webs
Moon, Jiho ; Yi, Jongwon ; Choi, Byung-Ho ; Lee, Hak-Eun ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 497~505
Corrugated steel webs resist only shear force because of the accordion effects. The shear force in the web can cause three different buckling mode: local, global, and interactive shear buckling modes. The shear behavior of the corrugated steel webs have been investigated by several researchers. However, shear buckling behavior of the corrugated webs are not clearly explained yet. And, it lead the conservative design. This paper presents shear strength of trapezoidally corrugated steel webs. A series of the tests were also conducted to verified proposed shear strength. Firstly, local, global, and interactive shear buckling equations provided by previous researchers were rearranged as a simple form considering the profiles of the existing bridges with corrugated steel webs. And, global and interactive shear buckling coefficient, and shear buckling parameter for corrugated webs were suggested in this study. Inelastic buckling strength can be determined from buckling curves based on the proposed shear buckling parameter. From the test results of this study and those of previous researchers, it can be found that suggested shear strength provides good estimation of those of trapezoidally corrugated steel webs.
Estimation of Displacement Response from the Measured Dynamic Strain Signals Using Mode Decomposition Technique
Chang, Sung-Jin ; Kim, Nam-Sik ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 507~515
In this study, a method predicting the displacement response of structures from the measured dynamic strain signal is proposed by using mode decomposition technique. Evaluation of bridge stability is normally focused on the bridge completed. However, dynamic loadings including wind and seismic loadings could be exerted to the bridge under construction. In order to examine the bridge stability against these dynamic loadings, the prediction of displacement response is very important to evaluate bridge stability. Because it may be not easy for the displacement response to be acquired directly on site, an indirect method to predict the displacement response is needed. Thus, as an alternative for predicting the displacement response indirectly, the conversion of the measured strain signal into the displacement response is suggested, while the measured strain signal can be obtained using fiber optic Bragg-grating (FBG) sensors. As previous studies on the prediction of displacement response by using the FBG sensors, the static displacement has been mainly predicted. For predicting the dynamic displacement, it has been known that the measured strain signal includes higher modes and then the predicted dynamic displacement can be inherently contaminated by broad-band noises. To overcome such problem, a mode decomposition technique was used. Mode decomposition technique estimates the displacement response of each mode with mode shape estimated to use POD from strain signal and with the measured strain signal decomposed into mode by EMD. This is a method estimating the total displacement response combined with the each displacement response about the major mode of the structure. In order to examine the mode decomposition technique suggested in this study model experiment was performed.
Hysteretic Damage Model for Reinforced Concrete Joints Considering Bond-Slip
Kim, Do-Yeon ; Choi, In-Kil ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 517~528
This paper presents a hysteretic damage model for reinforced concrete (RC) joints that explicitly accounts for the bond-slip between the reinforcing bars and the surrounding concrete. A frame element whose displacement fields for the concrete and the reinforcing bars are different to permit slip is developed. From the fiber section concept, compatibility equations for concrete, rebar, and bond are defined. Modification of the hysteretic stress-strain curve of steel is conducted for partial unloading and reloading conditions. Local bond stress-slip relations for monotonic loads are updated at each slip reversal according to the damage factor. The numerical applications of the reinforcing bar embedded in the confined concrete block, the RC column anchored in the foundation, and the RC beam-column subassemblage validate the model accuracy and show how including the effects of bond-slip leads to a good assessment of the amount of energy dissipation during loading histories.
Study on Rate Dependent Fracture Behavior of Structures; Application to Brittle Materials Using Molecular Dynamics
Kim, Kunhwi ; Lim, Jihoon ; Llim, Yun Mook ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 529~536
The failure behavior of structures is changed under different loading rates, which might arise from the rate dependency of materials. This phenomenon has been focused in the engineering fields. However, the failure mechanism is not fully understood yet, so that it is hard to be implemented in numerical simulations. In this study, the numerical experiments to a brittle material are simulated by the Molecular Dynamics (MD) for understanding the rate dependent failure behavior. The material specimen with a notch is modeled for the compact tension test simulation. Lennard-Jones potential is used to describe the properties of a brittle material. Several dynamic failure features under 6 different loading rates are achieved from the numerical experiments, where remarkable characteristics such as crack roughness, crack recession/arrest, and crack branching are observed during the crack propagation. These observations are interpreted by the energy inflow-consumption rates. This study will provides insight about the dynamic failure mechanism under different loading rates. In addition, the applicability of the MD to the macroscopic mechanics is estimated by simulating the previous experimental research.
A Study on the Prediction of Ultimate Stress of Tendon in Unbonded Prestressed Concrete Beams without Slip
Hong, Sung-Su ; Yoo, Sung-Won ; Park, Seung-Bum ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 537~548
Recently, the prestressed unbonded concrete structures are increasingly being built. The mechanical behavior of prestressed concrete beams with unbonded tendon is different from that of normal bonded PSC beams in that the increment of tendon stress was derived by whole member behavior. The purpose of the present paper is therefore to evaluate the flexural behavior and to propose the equation of ultimate tendon stress by performing static flexural test according to span/depth, concrete compression strength, reinforcement ratio and the effect of existing bonded tendon. From experimental results, for cracking, yielding and ultimate load, the effect of reinforcement ratio was more effective than concrete compression strength, and the beams having high strength concrete had a good performance than having low concrete, but there was no difference between high strength and low strength. And as L/dp was larger, test beams had a long region of ductility. This means that unbonded tendon has a large contribution after reinforcement yielding. Especially, the equation of ACI-318 was not match with test results and had no correlations. After analysis of test results, the equation of ultimate unbonded tendon stress without slip was proposed, and the proposed equation was well matched with test results. So the proposed equation in this paper will be a effective basis for the evaluation of unbonded tendons without slip, analysis and design.
Determination of Plastic Settlement of Mortar Using Non-contact Laser Measurement Device
Kwak, Hyo-Gyoung ; Ha, Soojun ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 549~564
In this paper, the plastic settlement of mortar is analyzed on the basis of the small strain consolidation theory, and the validity of the approach is verified through the comparison with experimental data. First, the amount of settlement caused by self-weight of bulk mortar is measured using a non-contact laser measurement device and the estimation of material parameters related to the settlement of mortar is followed. In advance, another experiment is also performed on mortar with embedded reinforcement to measure the settlement distribution, and the influence of mixture proportions and cover depth on unequal settlement is analyzed. Finally, correlation studies between experimental data and settlement distribution obtained by consolidation analysis represents that the application of consolidation theory to the analysis of plastic settlement of mortar is reasonable.
A Study on Electromagnetic Properties in OPC Mortar with Different Chloride Content
Kwon, Seung-Jun ; Na, Ung-Jin ; Feng, M.Q. ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 565~571
Recently, the evaluation technique using NDT (Nondestructive Technique : NDT) is widely utilized because it makes little damage on RC (Reinforced Concrete : RC) structures. The techniques using electromagnetic properties (EM properties) are also attempted for the evaluation of the performance of concrete which is nonmetallic. For the economic manufacturing of concrete material, sea-sand is often used as aggregate, however, chloride ion in concrete has direct effects on steel corrosion and EM properties. In this study, OPC mortar specimens with 5 different chloride amount (0.0, 0.6, 1.2, 2.4, and
) and 3 different water-cement ratios (45%, 55%, and 65%) are prepared in order to investigate the EM properties corresponding to concrete properties. The EM properties of conductivity and dielectric constant are measured in the frequency range over 0.2~20 GHz. To facilitate the comparison of EM properties with chloride content, average values are taken respectively for the conductivity and dielectric constant measured over the 5~20 GHz frequency range. According to the results of this experiment, dielectric constant and conductivity are increased with lower W/C ratio and larger amount of chloride content.
Influence of the Filler's Particle Size on the Mechanical Properties of Ultra High Performance Concrete(UHPC)
Kang, Su Tae ; Park, Jung Jun ; Ryu, Gum Sung ; Kim, Sung Wook ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 573~580
In this paper, we estimated the effect of the siliceous filler's particle size on the performance of Ultra High Performance Concrete (UHPC). Filler's particle diameters considered in this paper were about 2, 4, 8, 14,
and the performance was evaluated by testing fluidity in fresh concrete, compressive strength, ultimate strain, elastic modulus and flexural strength in hardened concrete. We also carried out XRD and MIP tests to analyze the relationship between the mechanical properties and microstructure. Test results showed that the smaller filler's particle size improves flowability and strength properties. MIP results revealed that the smaller size of filler decreased the porosity and thus increased the strength of UHPC. From XRD analysis, we could find out there were little influence of filler's particle size on chemical reactivity in UHPC.
Experimental Study on Connectability of Half-Depth Precast Deck Panels with Loop Joint
Chung, Chul Hun ; Sung, Yeol Eun ; Hyun, Byung Hak ; Park, Se Jin ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 581~590
The panels are used as a composite part of the completed deck. They replace the main bottom transverse deck reinforcement and also serve as a form surface for the cast-in-place concrete upper layer that contains the top of deck reinforcement. In this paper, three types of the detail for joints was selected and their structural performance in terms of strength and crack contral was investigated through static tests on composite beams. Form the results, the validity of loop joints for continuity of half-depth precast deck was observed and especially an overlapping length of loop joint and transverse reinforcement were checked. The results suggest that increasing the loop overlapping length increases the flexural strength of half-depth precast deck with loop joints. In terms of crack contral, the loop joint with transverse reinforcement showed better performance.
Performance Assessment of Precast Concrete Segmental Bridge Columns with Shear Resistance Connecting Structure
Kim, Tae-Hoon ; Kim, Young-Jin ; Kim, Seong-Woon ; Shin, Hyun-Mock ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 591~601
The purpose of this study was to investigate the performance of precast concrete segmental bridge columns with shear resistance connecting structure. The system can reduce work at a construction site and makes construction periods shorter. A model of precast concrete segmental bridge columns with shear resistance connecting structure was tested under a constant axial load and a cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. An bonded or unbonded tendon element based on the finite element method, that can represent the interaction between tendon and concrete of prestressed concrete member, is used. A joint element is newly modified to predict the inelastic behaviors of segmental joints. The proposed numerical method gives a realistic prediction of performance throughout the loading cycles for several test specimens investigated.
A Study on the Property Estimation of Recycled Coarse Aggregate and Characteristic of Recycled Aggregate Concrete Using the Surface Coated Treatment Method
Kim, Nam Wook ; Kim, Hyeok Jung ; Bae, Ju Seong ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 603~609
The recycled aggregates which were produced from the waste concretes have the disadvantages of inferior properties for natural aggregate. Therefore, in order to reuse the recycled aggregate it must be solved to improve the quality of recycled aggregate. In this study, the quality of recycled aggregate was improved by the surface treatment method using the colloidal silica solution. And, in order to examine the possibility of reusing the surface coated recycled aggregate in constructing concrete structures, we studied the mechanical properties and durability of the concrete using the surface coated recycled aggregates and the other concrete.
Earthquake Response Analysis of a RC Bridge Including the Effect of Repair/retrofitting
Lee, Do Hyung ; Cho, Kyu Sang ; Jeon, Jeong Moon ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4A, 2008, Pages 611~622
Nonlinear analyses have been carried out for both bridge piers and a bridge structure being repaired using a repair element in order to assess the post-repair seismic response of such structures. For this purpose, a simplified CFRP stress-strain model has been proposed. The analytical predictions incorporating the current developments correlate reasonably well with experimental results in terms of strength and stiffness. In addition, nonlinear dynamaic analyses have also been conducted for a bridge structure in terms of the created multiple earthquake sets to evaluate the effect of pier repair on the response of a whole bridge structure. In these analyses, potential plastic hinge zones of piers are virtually repaired by CFRP and steel jacketing. Comparative results prove the virtual necessity of performing nonlinear post-repair analyses under multiple earthquakes, particularly when the post-repair response features are required. In all, the present approaches are expected to provide salient information regarding a healthy seismic repair intervention of a damaged strcuture.