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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 13, Issue 6 - Nov 2009
Volume 13, Issue 5 - Sep 2009
Volume 13, Issue 4 - Jul 2009
Volume 13, Issue 3 - May 2009
Volume 13, Issue 2 - Mar 2009
Volume 13, Issue 1 - Jan 2009
Selecting the target year
Piping Analysis for Excavation in a Embankment
Lee, Song ; Kook, Joong-Jin ; Jung, Min-Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 59~68
One of the cause of embankment failure for piping is a routine design for piping consideration without exact understanding of that. Therefore, in this study, comparison and analysis of existing piping consideration methods had been conducted through embankment sections when sheet piles constructed on sandy ground. For the Terzaghi method and the critical hydraulic method, safety factors were changed up to double depending on the method. And for the critical velocity method, it was dramatically changed due to design parameters. Consequently, existing piping consideration method currently used is recommended not to be applied to all ground conditions uniformly but to applied with exact understanding of each consideration method characteristics depending on ground conditions.
An Experimental Study about Behavior of a Repaired Underwater Structure with an Epoxy Fiber Panel and Polymer Mortar
Hong, Sung-Nam ; Park, Jun-Myoung ; You, Chung-Jun ; Han, Kyoung-Bong ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 69~77
An underwater structure is made to put with serious damage state by special environmental factors. If this damage phenomena persist, as for the structure, it is generated a structural serious problem because of the corrosion of a reinforcing bar and the loss of the concrete cut end. Repair work of an underwater structure is very harder than repair work in land, and it is actual that certification about a maintenance effect is uncertain. And the existing repair method is applied to a structure damaged with you without verification of a repair effect by a foreign reward and experience. In this study, a repair method about an underwater structure was proposed and observed a behavior characteristic and interface failure of an specimens. and comparison analyzed an effect of a proposed maintenance method.
A Fundamental Study on the Characteristics of Concrete with the Substitution Ratio of the Rapidly Cooled Steel Slag
Kim, Nam-Wook ; Bae, Ju-Seong ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 78~87
When the steel slag is utilized to the concrete as the alternative fine aggregate, its use is limited as the concrete aggregate because of expansibility caused by much quantity of free CaO. So, this study is intended to examine the characteristics of the concrete which uses the rapidly cooled steel slag whose content of free CaO is sharply reduced by rapidly cooling the steel slag as the fine aggregate. Accordingly, by comparing and considering the results of the concrete slump loss test with the different substitution ratio and fine aggregate ratio of rapidly cooled steel slag, hydration by XRD and SEM analysis, compressive test by age, a length variation test and rapid chloride ion penetration test, the rapidly cooled steel slag's proper substitution ratio and the fine aggregate ratio was derived.
Development of Wireless Measurement System for Bridge Using PDA and Fiber Optical Sensor
Kwak, Kae-Hwan ; Hwang, Hae-Sung ; Jang, Hwa-Sup ; Kim, Woo-Jong ; Kim, Hoi-OK ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 88~96
This study proposes a wireless measurement system that is a new safety management system by using an FBG sensor and a PDA. The sensor part has many advantages of implementing a wireless measurement system, and the study emploies an FBG-LVDT sensor, FBG-STRAIN sensor, FBG-TEMP sensor, and FBG-ACC sensor, using FBG sensors. Also, the study show a configuration of a signal process system for operating a wireless transmission system of FBG sensors applied to the signal process system, and engrafted the cutting edge information technology industry in order to display from a remote distance using a PDA. In order to verify the applicability of the developed FBG sensors and wireless measurement monitoring system to the field, their accuracy, and usability, the study has conducted a static and dynamic test to a bridge in the field. The study made an assessment of service for the vibration of the bridge by applying dynamic data measured by an FBG-LVDT sensor and FBG-ACC sensor to Meister's curve and prepared methods for assessing the vibration of the bridge by proposing a standard of vibration limitation given the service of vibration of the bridge. As a follow up for this study, it would be necessary to set up an overall model for the standard of service assessment established in this study.
A Study on Corrosion Potential of Cracked Concrete Beam According to Corrosion Resistance Assessment
Song, Ha-Won ; Lee, Chang-Hong ; Lee, Kewn-Chu ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 97~105
Development and use of blended cement concrete is gaining more importance in the construction industry with reference to durability mainly due to the pore refinement and reduction in permeability. Cracks play a major role on important parameters like permeability, rate of chloride ingress, compressive strength and thus affect the reinforcement corrosion protection. Furthermore, when a crack occurs in the cover concrete, the corrosion of the steel reinforcement may be accelerated because the deterioration causing factors can pass through the crack. In recent years the effect of cracking on the penetration of concrete has been the subject of numerous investigations. Therefore assessing the service life using blended concrete becomes obviously in considering the durability. In the present study, the corrosion assessment of composite concrete beams with and without crack with of 0.3mm using OPC, 30% PFA, 60% GGBS, 10% SF was performed using half cell potential measurement, galvanic potential measurement, mass loss of steel over a period of 60days under marine environmental conditions and the results were discussed in detail.
Steel Design of Continuously Reinforced Concrete Pavement based on the Width of Transverse Crack
Kim, Kyeong-Jin ; Kim, Dong-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 106~114
The steel design based on the width of transverse crack which is the major factor to affect a long-term performance of continuously reinforced concrete pavement was developed. For this study, twenty-one cities of Texas were selected and the temperature data was collected at those locations during the past ten years. From the data, zero-stress temperatures were calculated by the PavePro program and the widths of transverse crack were analyzed by the CRCP program. The variables used to this numerical analysis were slab thickness, coefficient of thermal expansion of concrete, steel ratio, and design temperature. The total of 448 factorial runs were made and the regression analysis was performed using the results. Steel ratios from the regression equations were backcalculated and a steel design table was proposed.
Crack Propagation Analysis Using the Concept of an Equivalent Plastic Hinged Length
Park, Si-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 115~124
In this study, a numerical analysis technique was newly developed to evaluate the damage propagation characteristics of concrete structures. To do this, numerical techniques are incorporated for the concrete members up to the compressive damage due to the bending compressive forces after the tensile crack based on the deformation mechanism. Especially, for the compressive damage stage after the tensile crack, the crack propagation process will be analyzed numerically using the concept of an equivalent plastic hinged length. Using this concept, it can be established that section forces, such as axial forces and the moment cracks takes place, can be related to the width of the crack making it possible to analyze the crack extension.
Free Vibrations of Circular Uniform Strips Resting on Two Parameter Elastic Foundation
Lee, Jong-Cheon ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 125~134
This paper deals with the free vibrations of circular strip foundations which have uniform solid rectangular cross-section. The ground which supports circular strips was modeled as the two parameter elastic foundation. Differential equations governing the flexural-torsional free vibrations of circular strips supported by such foundation were derived, and solved numerically for obtaining the natural frequencies and mode shapes. Boundary condition of free-free ends was considered for numerical examples. Four lowest natural frequencies according to the variations of five system parameters i.e. subtended angle, depth ratio, contact ratio, elasticity ratio and soil parameter are reported in the non-dimensional forms. Also, typical mode shapes of both deformations and stress resultants are presented in the figures. Experiment was conducted for validating the theory developed in this study.
Performance Evaluation of Scale-down Concrete Filled FRP Columns
Youm, Kwang-Soo ; Lee, Seung-Hwe ; Lee, Young-Ho ; Song, Jae-Joon ; Hwang, Yoon-Koog ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 135~144
The present paper represents experimental studies on the performance of concrete filled FRP columns. Eight scale-down specimens were conducted by quasi-static cyclic loading test. FRP thickness, concrete strength, horizontal rebar ratio, and diameter were selected as test parameters. The capacities of ductility for cyclic loading was evaluated and the damping ratio and failure mode from the stiffness reduction of each test specimen were compared.
The Experimental Study for inferring the Safety-Factor of the Limit of Span-Deflection in Standard Specifications for Highway Bridges for Setting the Standard of the Measurement Criteria in RC Girder
Joo, Bong-Chul ; Park, Ki-Tae ; Hwang, Yoon-Koog ; Lee, Woo-Sang ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 145~151
The span deflection among the monitoring items of bridge measurement system in real time is representative behaviour and important index of superstructure condition. the limit of span deflection in Standard Specifications for Highway Bridge in Korea has been applied to the method that is making the management-criteria for span deflection in bridge measurement system. But the limit concern mainly serviceability of divers. So it is difficult to find the safety factor of the limit from the viewpoint of bridge safety. This study estimated the safety factor of the limit of span-deflection in Standard Specifications for Highway Bridge in Korea from the viewpoint of bridge safety by the indoor structural test.
In-Situ Application of the Steel Pipe jacking with Grouting
Jung, Min-Hyung ; Lim, Ho-Jung ; Shin, Chang-Sub ; Lee, Song ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 152~160
The pipe jacking method which is a non-excavation method is frequently used due to constructability and economical efficiency in a medium or small-sized pipeline construction. However, jacking process of the method still causes problems that the base ground is disturbed and loosen. These lead to surface settlement, strength decrease and leakage of water. Therefore, this study presents in-situ application of the steel pipe jacking with grouting, and it is that jacking and grouting are progressed simultaneously. To verify this, the steel pipe jacking with grouting and the existing steel pipe jacking have been constructed on the same ground condition. It has been proved that the steel pipe jacking with grouting is in-situ applicable according to results of monitoring surface settlement, in-situ density, GPR geophysical prospecting and large scale direct shear test.
Flowability and Strength Properties of High Flowing Self-Compacting Concrete with Steel Fiber Reinforced
Choi, Yun-Wang ; Choi, Wook ; Jung, Jea-Gwone ; An, Tae-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 161~168
In this study, the concrete, in which the steel fiber(SF) with different volume-surface ratios and lengths was intermixed in High flowing Self-Compacting Concrete(HSCC), was produced to compare with steel fiber reinforced concrete as a part of plan to improve the workability and the quality of steel fiber reinforced concrete. As the result of experiment, the flowing and passing characteristics of HSCC intermixed with SF was highly improved as there was no fiber ball phenomenon due to the effect of high flowability and the viscosity, and in the identical range of compressive strength, it showed the tendency that the splitting and flexural strength was increasing as the length was getting longer regardless of volume-surface ratio when compared with HSCC which was intermixed with SF. It is estimated that in case of application of HSCC intermixed with steel fiber to work sites, it would be possible to improve the workability and the quality which would be better than that of steel fiber reinforced concrete which has been used.
Comparative Flexural Performance of Concrete Panels Reinforced with Ring-Type Steel Fibers and with Hooked-End Straight Steel Fibers
Lee, Chadon ; Cho, Won-Tack ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 169~178
Ring-type steel fibers (RSFs) of the closed circular shape, have different resistance mechanisms other than straight steel fibers. RSFs also maintain the same value of the orientation factor for the plane enclosed by the fiber ring perimeter. In this research, comparative studies were performed for the panels reinforced with RSFs and with straight steel fibers of
, respectively. Resisting mechanisms of RSFs were identified and higher toughness indices were experimentally observed for the concrete panels reinforced with RSFs than with straight steel fibers. Orientation factor for the RSF was suggested. It was found that RSFs were more effective in increasing toughness for the panel specimens with relatively thinner thickness than beam specimens.
An Experimental Study on the Application of FRP Tube to the Struts of PSC Box Girder Bridge
Song, Jae-Joon ; Hwang, Yoon-Koog ; Lee, Young-Ho ; Lee, Seung-Hye ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 179~185
In recent, the investigations related to the FRP(Fiber Reinforced Polymers) have been increased due to their superior material and mechanical properties such as environmental resistance, high specific strength and stiffness. Considering these advantages, the FRP tube may be proper for strut on the PSC box girder bridge that can maximize the efficiency of cross section and are effective on economics and aesthetics of bridges. In this research, the specimen tests of the FRP tube and compression tests of the concrete member enclosed with the FRP were performed in order to evaluate the suitability of the FRP tubes, which are applied to the PSC box girder bridge with strut. The specific strength of concrete and the energy absorbing capacity as well as ductility were increased according to the experimental results, and it was found that FRP tubes have sufficient safety as strut member.
Flexural Behavior of Concrete Beams Reinforced with Lap Spliced FRP Bar
Oh, Hongseob ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 186~194
This is a part of the extensive ongoing investigation being carried out by author to develop appropriate design procedure of the concrete member reinforced with FRP rebars instead of conventional steel rebars. This study presents the experimental results of a research programme to assess the structural characteristics of spliced rebar in reinforced concrete members with FRP reinforcement. The test variables are the diameter of FRP rebar and the embedment length. The development length (ld) was calculated according to the ACI 440 for FRP rebars in concrete. A total of 14 concrete beams reinforced with spliced FRP rebars and 4 reference beams reinforced with non-spliced FRP rebars were tested. The effects of bar size (10, 13, 16 and 19 mm) and splice length (from 0.72 to 1.58ld) on the bond strength were empirically evaluated. The test results indicate that a modification factor of 1.3 and 1.6 is relatively sufficient for the bond development length of glass FRP rebars in order to achieve an adequate tension lap splice length.
Shear Strengthening Effect on Reinforced Concrete Beams Strengthened by Vertical Slit Type Steel Plates
Lee, Choon-Ho ; Kwon, Ki-Hyuk ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 195~204
Application of steel plates is one of widely used methods for shear strengthening of reinforced concrete beams that are insufficient of shear capacity. While the existing method applying solid steel plates provides good shear rigidity, however, it is concerned by brittle bond failure patterns, inefficient material usage, and low constructability. The use of strap type steel plates has also shortcomings of low strenthening effect due to small interface bonding area and ununified behavior between plates and main body. Therefore, this study aims to introduce the shear strengthening method using slit type steel plate, which can solve out the problems aforementioned, and to verify its strengthening effects on shear capacity. A total of 13 specimens strengthened by slit type steel plates were fabricated with primary test parameters of plate width, slit spacing, and plate thickness. The test results from this study were also compared to those from the existing research on RC beams strengthened by strap type steel plates, and the strengthening effects on shear capacity of specimens having bonded slit type steel plates were quantitatively analyzed. The test results showed that the RC beams strengthened by slit type steel plates had greater shear capacities than those with strap type steel plates, which is considered to be the effects of improved composite behavior and larger interface bonding area in the RC beams strengthened by the slit type steel plates.
Evaluation of Applicability of Cable Force Monitoring System of Cable-stayed Bridge by Field Loading Test
Kim, Jeong-Hoon ; Song, Jae-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 1, 2009, Pages 205~213
This study was planned to develop monitoring system of cable force to resolve cable force of cable-stayed bridge efficiently in a long-term plan. In the proposed monitoring system, firstly data are sampled from real-time acceleration record, secondly these sampled data are frequency analyzed by using the FFT(Fast Fourier Transform) algorism and lastly the analyzed results are averaged and generalized. For evaluating the applicability of this monitoring system, field loading test has performed in real cable-stayed bridge. In comparison with cable force by field manual calculation and cable force of monitoring system by semi-automatic calculation, the difference of calculated cable forces has within 1% error range and it is acceptable range. Additionally within negligible 5% error range of difference has occur between field manual calculation and monitoring system by automatic calculation. so monitoring system in this study has been verified to be reliable.