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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea institute for structural maintenance and inspection
Journal Basic Information
Journal DOI :
Korea Institute for Structural Maintenance Inspection
Editor in Chief :
Volume & Issues
Volume 11, Issue 6 - Nov 2007
Volume 11, Issue 5 - Sep 2007
Volume 11, Issue 4 - Jul 2007
Volume 11, Issue 3 - May 2007
Volume 11, Issue 2 - Mar 2007
Volume 11, Issue 1 - Jan 2007
Selecting the target year
Selection of Concrete Surface Impregnant through Durability Tests
Kwon, Seung-Jun ; Park, Sang-Sun ; Lee, Sang-Min ; Kim, Jong-Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 77~86
The repair technique utilizing surface impregnant is widely used due to its simple construction procedures and economical benefit. Surface protection through this reparing technique cannot increase the bearing capacity of concrete members much but increase the durability performance and service life efficiently. In this study, fundamental tests such as water suction and permeation are performed for concrete specimens with several organic/inorgarnic impregnant and suitable impregnant is selected on the basis of the results. Finally, durability tests such as carbonation, freezing and thawing, and chloride attack are carried out for the concrete specimens with selected impregnant and it is experimentally verified that they have good resistance to deteriorations.
Quantification of Localized Fracture Mechanism of Recycled Aggregate Concrete in Compression using Acoustic Emission Technique
Kim, Sun-Woo ; Yun, Hyun-Do ; Kim, Yun-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 87~94
Reuse of recycled aggregate from demolished concrete structure is beneficial and necessary from the viewpoint of environmental preservation and effective utilization of resources. The most important mechanical properties of recycled aggregate concrete (RAC) are the compressive strength, the tensile and the flexural strengths, the bond strength and the elastic modulus of such concrete. In particular, the stress-strain relation and fracture process of RAC in compression is especially important in theoretical and numerical analysis as well as engineering design of RAC structures. In this paper, to clarify the characteristics of fracture process in RAC, acoustic emission(AE) method is applied to detect micro-cracking in concrete under compression. From AE parameters, it is found that cracking and fracture behaviors in recycled aggregate concrete fairly differ from that of normal and recycled sand concrete.
An Experimental Study on Strengthening Performance of RC Slab used of Surface Bonded Method of GSP and CFRP Sheet
Ahn, Ki-Man ; Kim, Kwang-Soo ; Park, Sun-Kyu ; Lee, Young-Jae ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 95~102
Recently, an improved capacity for RC bridges is required by their deterioration or necessary to carry traffic increase. Strengthening is known as a better way to improve capacity of bridges than reconstructing in terms of economy. The surface bonded method, which is normally used with FRP material, has some advantages related to conveninent application and time-save among other strengthening methods. FRP material is light and has high tensile strength compared to steel. Therefore, this paper presents how structural capacity strengthed with CFRP sheet and Glass fiber-Steel Plate (GSP) is improved.
Two-Demensional Nonlinear Analysis of Precast Segmental PSC-I Girder with Wet Joint
Kim, Kwang-Soo ; Hong, Sung-Nam ; Han, Kyoung-Bong ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 103~112
The purpose of this study is to evaluate the characteristics of the structural behavior in precast segmental prestressed concrete girders, which consist of five precast segments. These girders were developed to save labor and cost in construction field reducing a term of work. Therefore, four different types of specimens of 25m in length were built, and they were tested and analyzed for observing flexural behavior. The analysis included the investigation of the flexural behaviors in varying tendon amount and at joints using the relationship between moment and deflection. Moreover, nonlinear finite element analysis was utilized to verify the experimental result.
A Case Study of Investigating Appropriate Replacement Area for the Stability of Reinforced Retaining Walls on Soft Ground
Song, Young-Sun ; Lee, Byung-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 113~120
For the cases of constructing reinforced earth and gabion walls on the soft ground, an appropriate replacement area of soft ground required to maintain the stability of walls was investigated by FEM analyses. Incremental analyses were performed in FEM, in which construction sequences including consolidation of soft soil layer were simulated. As a first step to suggest the appropriate replacement area, a series of analyses for cases varying the replacement depth were conducted to examine the behaviors of wall and adjacent ground according to the construction sequence. The analysis results were, then, evaluated with the proper limiting values of displacements of wall, settlements and shear strains of ground to guarantee the stability of walls, which were specified based on the literature review. Consequently, the typical construction drawings could be suggested, in which appropriate replacement areas for varying wall heights for the ground condition investigated in this study were represented in terms of the ratio of replacement depth to the height of wall.
Effect of Bedding Conditions on Earth Pressure Distribution of Embedded Pipes
Yoo, Nam-Jae ; Lee, Hee-Kwang ; Park, Byung-Soo ; Jeong, Gil-Soo ; Sim, Do-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 121~130
In this paper, large scale experimental model tests were performed to investigate the distribution of earth pressure acting on embedded rigid pipes having different bedding conditions. For these tests, very light weighted EPS blocks were installed at top and bottom of the rigid pipe and Jumunjin Standard Sand was used as a ground material. As results of model tests, for the case of no bedding on the pipe, the measured pressure at the bottom of the pipe was
whereas they were in the range of
in the case of EPS beddings being installed at the top and the bottom of the pipe. Therefore, for the case of EPS bedding being installed, the ratio of reduced pressures acting on the pipe, compared with the case of no EPS beddings, were in the rage of 16~62%. As a result of parametric test with changing the locations of EPS bedding, the trend of reducing the stress acting on the pipe was in the order of bottom bedding, top bedding, and top and bottom bedding. Effect of bedding positions on the reduced magnitude of acting pressure on the pipe was more significant in the case of top bedding than in the case of the bottom bedding.
Practical Model to Estimate Road User Cost for Bridge Maintenance Strategy
Park, Kyung-Hoon ; Sun, Jong-Wan ; Lee, Sang-Yoon ; Lee, Jong-Soon ; Cho, Hyo-Nam ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 131~142
The road user cost in indirect costs as well as direct costs such as the inspection/ diagnosis cost and the repair/reinforcement cost should be considered as one of the important items in the life-cycle cost-effective design and maintenance of the bridges. To estimate the road user cost, this paper formulates the road user cost as a sum of the user delay cost and the vehicle operating cost considering the detour effect. A numerical traffic simulation and a regression analysis are performed to develop a regression model due to a time delay. The proposed regression model is applied to the generation of the maintenance strategy based on the life-cycle cost and performance, and its effectiveness and applicability is investigated. The road user cost has a great influence on establishing the maintenance strategy, and the proposed regression model could be successfully utilized to estimate the road user cost of a bridge.
The Evaluation of Surface Scaling and Resistance of Concrete to Frost Deterioration with Freezing-Thawing Action by Salt Water
Kim, Gyu-Yong ; Kim, Moo-Han ; Cho, Bong-Suk ; Lee, Seung-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 143~151
This study presents the experimental results of frost durability including resistance to freezing-thawing and surface scaling of concrete. Mixing design was proportioned with the various water-binder ratio between 0.37 and 0.47 and three different binder compositions corresponding to Type I cement without any supplementary cementitious materials(OPC), Type II cement with 50% blast-furnace slag replacement(BFS50), and ternary cement with Type III cement, 15% fly ash, and 35% slag replacement (BFS35%+FA15%). Test results showed that the mixing design with BFS50% and BFS35%+FA15% exhibited higher durability factor than that made with OPC only. Finally, the use of blend cement containing slag can be used effectively in terms of frost durability of the concrete exposed to severe condition under coastal environment like as flying salt, sea water spray, etc.
Diffusion of Chloride Ions and Evaluation of Lifetime in Highway Bridges
Shin, Jae-In ; Park, Chang-Ho ; Lee, Byeong-Ju ; Kim, Hyeong-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 152~158
Chloride attach is one of the main factors which cause the deterioration of structures. In the case highway bridges, de-ice salts very significantly increase the surface scaling due to frost action. The deteriorated concrete is subject to experience degrading of durability under chloride attach environment. In this study, diagnosis report of 147 bridges is investigated and core sample of 21 bridge decks is examined and analyzed. The results show that the cover of decks concrete is required more than 8cm for retaining bridge lifetime over 30 years.
A Study on the Application of the Beam-Column Theory to Presume the Axial Force of the Continuous Welded Rail
Lee, Woo-Chul ; Ryu, Hyo-Jin ; Lim, Nam-Hyoung ; Lee, Chin-Ok ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 159~168
The problem of determination of axial force in continuous welded rail(CWR) has attracted a number of railroad engineers due to its practical importance in prevention of accidents related to buckling and pull apart. In this paper, we investigated the application of the beam-column theory to presume the axial force in CWR and proposed the development process of the prediction equation and model to presume the axial force in CWR.
Development of Steel Pipe Splice Sleeve for High Strength Reinforcing Bar(SD500) and Estimation of its Structural Performance under Monotonic Loading
Lee, Sang-Ho ; Kim, Hyong-Kee ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 169~180
Among several splicing system of reinforcing bar, the grout-filled splice sleeve system has been applied widely. However, as the splice sleeve for high strength rebar as SD500 is not yet made in korea, the development of splice sleeve for high strength reinforcing bar are required as soon as possible. It is the purpose of this study to develop the steel pipe sleeve for high strength rebar as SD500 and estimate its structural performance by monotonic loading test. The experimental variables adopted in this study are the development length of rebars, types of sleeve etc. The results of this study showed that the developed steel pipe splice sleeve system for high strength reinforcing bar as SD500 retained the structural performance required in domestic, ACI and AIJ criteria. And it is considered that the study result presented in this paper can be helpful in developing reasonable design method of steel pipe splice sleeve system for high strength reinforcing bar as SD500.
Development of Evaluation Method of External Tendon Force by Using the Deriving Ultrasonic Pulse
Park, Seung-Bum ; Hong, Sung-Su ; Yoo, Sung-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 181~192
In domestic case, there are no results of corresponding researches for measuring external tendon force. The purpose of the present paper is therefore to measure external tendon force by using deriving ultrasonic method. For this purpose, we designed and manufactured wedges and test system, and measured ultrasonic pulse velocity and pulse amplitude. By using measured data, we tried to analyze the characteristics of tendon force, and to derive the relationship between tendon force and ultrasonic pulse velocity, finally to develop the technic of measuring system using ultrasonic pulse velocity. So tendon force-velocity relationship was proposed by equations, and those equations of which errors were 3.92~8.77% will be possible to adapt in-site.
Spalling Analysis of High-Strength Reinforced Concrete Columns under High Temperature
Shin, Sung-Woo ; Yoo, Suk-Hyeong ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 193~200
The spalling analysis of high strength concrete columns needs a very complex and difficult process accounting for peeling of cover concrete as well as thermal, thermo-stress and hygro-transfer phenomena. However, the study on the spalling analysis method is insufficient. The practical spalling analysis algorithm is developed in this study, which formulates a vapor pressure equation as the parameter of temperature and cover depth and uses the compatibility condition In results of the spalling analysis, as the concrete strength increases and the content of PP fiber decreases the degree of spalling increases. This shows a similar result as the previous experimental study. Therefore the developed algorithm suggested in this study is expected to be useful in predicting the spalling of high strength concrete columns.
The Flexural and Shear Behaviors of Steel-PSC Mixed Structural System with Front-Rear Plate Connection
Lho, Byeong-Cheol ; Cho, Sung-Yong ; Park, Hyun-Chul ; Kim, Mun-Kyum ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 201~212
This study presents experimental results of Steel-PSC mixed structural system having front-rear plate connection between Steel and Prestressed Concrete. Two kinds of Steel-PSC mixed structural system of 5.4m length were tested to evaluate flexural behaviors under four point loading, and 4 kinds of specimens with and without prestressing force at R & L type connection were tested to observe the shear behavior. Based on the test results of load-deflection curves and failure modes of specimens, it is found that the proposed L shape connection with front-rear plate connection between Steel and Prestressed Concrete has higher strength and stiffness. From the study, Steel-PSC mixed structural system with L shaped connection has a better structural performance in connection part.
A Study on the Estimation of Relative Compaction on the Subgrade using a Portable FWD
Kang, Hee-Bog ; Kim, Kyo-Jun ; Kang, Jin-Tae ; Kim, Jong-Ryeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 6, 2007, Pages 213~219
This study was intended to estimate of relative compaction on the ground under the load using of portable FWD. The outcome in the wake of the study is highlighted as below. Viewing the variation of dynamic deflection modulus depending on a number of compaction, when a number of compaction increased to 8 (18.3MPa) from 4 (15Mpa), a dynamic deflection modulus increased 27%, and when a number reached to 12 (27.9MPa), it doubled the value indicated in 4. Viewing the relationship between dry density and dynamic deflection modulus in line with the increase in a number of compaction, a number of compaction by the roller reaching to the degree of compaction equivalent to 95% of max dry density was 13, with a dynamic deflection modulus indicating 27MPa ~ 29MPa.