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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 12, Issue 6 - Nov 2008
Volume 12, Issue 5 - Sep 2008
Volume 12, Issue 4 - Jul 2008
Volume 12, Issue 3 - May 2008
Volume 12, Issue 2 - Mar 2008
Volume 12, Issue 1 - Jan 2008
Selecting the target year
Girder Bridge Slab Mechanization Construction that used GS-SCM(1)
Kim, Do-Hak ; Park, Jong-Heon ; Koo, Jeong-Hoi ; Lee, Jung Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 3~9
Girder Bridge Slab Mechanization Construction that used GS-SCM(2)
Kim, Do-Hak ; Park, Jong-Heon ; Koo, Jeong-Hoi ; Lee, Jung-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 10~17
Mechanized Construction of Caisson Using Jacking System (IP-CCV) and Floating Dock
Cho, Ho-Jin ; Park, Jae-Kil ; Lee, Won-Min ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 18~23
Strengthening Method of RC Slab with Pre-Flex Panel
Byun, Hang-Ryong ; Kim, Jun-Seong ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 24~31
In-Depth Inspection of Reinforced Retaining Wall Failure
Cho, Won-Gu ; Nam, Sang-Kyu ; Kim, Sang-Woo ; Lee, Kyu-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 32~37
A Service Life Prediction for Unsound Concrete Under Carbonation Through Probability of Durable Failure
Kwon, Seung Jun ; Park, Sang Soon ; Nam, Sang Hyeok ; Lho, Byeong Cheol ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 49~58
Generally, steel corrosion occurs in concrete structures due to carbonation in down-town area and underground site and it propagates to degradation of structural performance. In general diagnosis and inspection, only carbonation depth in sound concrete is evaluated but unsound concrete such as joint and cracked area may occur easily in a concrete member due to construction process. In this study, field survey of carbonation for RC columns in down-town area is performed and carbonation depth in joint and cracked concrete including sound area is measured. Probability of durable failure with time is calculated through probability variables such as concrete cover depth and carbonation depth which are obtained from field survey. In addition, service life of the structures is predicted based on the intended probability of durable failure in domestic concrete specification. It is evaluated that in a RC column, various service life is predicted due to local condition and it is rapidly decreased with insufficient cover depth and growth of crack width. It is also evaluated that obtaining cover depth and quality of concrete is very important because the probability of durable failure is closely related with C.O.V. of cover depth.
A Study of Design Parameter for the Field Application of High Performance Permanent Form (HPPF) Using Stainless Steel Fiber
Sim, Jong Sung ; Oh, Hong Seob ; Ju, Min Kwan ; Ha, Woo Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 59~66
In the construction site, to improve the man-dependent form work, non-stripping form has been studied but the developed non-stripping form was hard to applied with respect to the cost, form size and performance. This study is for evaluating the adaptability of the developed non-stripping form named as high performance permanent form (HPPF). To do this, the analytical approach and parametric study were performed based on the research for fundamental material characteristic of the HPPF. The target concrete structure is a wall structure because of its effectiveness of HPPF. To evaluate the structural efficiency of the HPPF applied wall structure, FEM analysis was performed to decide the maximum placing height at one time then it was applied to design the wall structure. In the result of the analysis, the HPPF applied wall structure showed the lots of advantages that it can reduce the cost resulted from reducing concrete and steel rebar even if it has same structural performance to the conventional concrete wall structure with same dimension. With this analysis result, it can be evaluated that the HPPF applied concrete structure can be a concrete structure with the long term durability in site.
Evaluation of the Bonding Behavior of the Rehabilitation Method Applying Carbon Fiber Subjected to the Variation of Environmental Condition
Han, Cheon Goo ; Byun, Hang Yong ; Park, Yong Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 67~74
This paper provides the test results of bonding behavior of the interface between concrete substrate and carbon fiber in the rehabilitation method applying carbon fiber with epoxy based resin adhesive. The difference in each components was gradually increased subjected to the repetition of temperature variation, regardless of the strength of the substrate concrete, while the ultrasonic interface between each component occurred. An increase in difference of the temperature resulted in a decrease in bond strength of each component. Associated failure mode was shown to be interfacial failure and substrate concrete failure. No remarkable changes were found in the deformation and ultrasonic velocity of each component until the four cycles of the dry and moisture test. Hence, the moisture condition may not affect the bonding behavior of each component. After the repetition of dry and moisture test, corresponding bond strength was reduced to 40% of that before test. For the effect of freeze and thaw test, the cycle of freeze and thaw within 4 cycles resulted in debonding of each component.
Methodologies for Survey and Retrofit of Small Dams Pierced by Diversion Tunnel
Jang, Bong Seok ; Im, Eun Sang ; Oh, Byung Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 75~82
There are almost 18,000 dams including about 1,200 large dams in Korea. The large dams are well operated and maintained by KWATER(Korea Water Resource Corporation), KRC(Korea Rural Community & Agriculture Corporation) and KHNP(Korea Hydro & Nuclear Power Co., Ltd.). Several research reports concern with the safety of these large dams are presented but there is no paper concerned with small dams which has diversion tunnel through the dam body. The purpose of this study is to show the common defects of small dams according to various cases of degradation of dams and the repair and retrofit methods which applied to the damaged dams. And this study performed resistivity survey to evaluate the effect of retrofitting dam. Also, this study tries to present the solution which concerned with these common defects in maintenance and design steps.
Effect of the Broken Red Bricks on the Mechanical Properties of Reinforced Concrete Beams
Kim, Jeong Sup ; Shin, Yong Seok ; Cho, Cheol Hee ; No, Sung Yeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 83~90
The purpose of this study is to attempt to use broken red brick, which is categorized as impurities of circular aggregate to thick aggregate, as a replacement for concrete. Through the material test and performance test for each mixing rate of the broken red brick (0%, 30%, 60%), the following conclusion was reached by studying the material and structural characteristics of circular aggregate to the concrete. Even though broken red brick, which is categorized as impurities of circular aggregate, is mixed 30% with normal rubble, the compression strength, intensity strength, and curving strength was similar to that of concrete that uses normal rubble. Therefore, concrete beam made with broken red brick can be applied to the real construction field. Also, the study regarding the cutting test of the concrete that uses broken red brick and regarding applying and mixing admixture that can increase the ductility factor will be required in the future.
Inspection of A Deteriorated Bridge Pier Cap Using Common Nondestructive and Destructive Test
Kim, Tae Wan ; Hong, Sung Nam ; Han, Kyoung Bong ; Park, Sun Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 91~102
Nondestructive testing techniques have been historically and commonly used to evaluate the quality of existing concrete structures. The techniques utilized included visual inspection, hammer sounding, Schmidt hammer rebounding, and ultrasonic pulse velocity testing including tomographic imaging. Results of the nondestructive tests were used to determine areas to be tested with local destructive tests. These tests included concrete compressive strengths, chloride testing, and petrographic testing. The overall results indicate that inside core of each of the pier caps are healthy. On all of the pier caps, extensive exterior concrete layer rehabilitation needs to be completed. This paper shows the application and interpretation of common nondestructive testing techniques and the consequent repair, rehabilitation, maintenance decisions and safety assesment.
Comparative Study on Test Methods for Mechanical Properties of Structural Adhesives Used in FRP Strengthening
You, Young Chan ; Choi, Ki Sun ; Kim, Keung Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 103~112
Pull-off test is generally used to evaluate bond strength of FRP composite with concrete at job site. However, some damages on FRP composites can not be avoided during pull-off test and moreover test range of pull-off strength is limited by maximum tensile strength of concrete. Accordingly, it is required to set-up a test method that can evaluate mechanical properties of structural adhesive indirectly prior to pull-off test. In this study, the standard test methods for structural adhesive which can simply evaluate mechanical performance of adhesive were suggested through comparative experiments from each different standard in various countries. Particularly, gluing thickness of adhesive in tensile lap-shear tests, the section dimension of compression and bending test specimens become unified, and standard test specimen size is achieved by test results.
A Study on Determination of Cable-Tension Using Unstrained-Length-Modification Method
Kong, Min Sik ; An, Chan Hyeog ; Yhim, Sung Soon ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 113~120
This study presents the ULMM(unstrained-length-modification method) to determine the cable tension consistent with target tension after arrangement of cable-members by controlling the unstrained length of cables. This method used to be shown to determine the exact unstrained length for cable-supported bridge with elastic catenary cable. The some verification examples show to determine the unstrained length that satisfies the target tension and to obtain the satisfactory result for cable-supported bridge. Accordingly this modification method of the unstrained length in this study is used to introduce the satisfactory target tension.
Development and Implementation of Dam Safety Management System
Jeon, Je Sung ; Lee, Jong Wook ; Shin, Dong Hoon ; Park, Han Gyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 121~130
Recently, we can see an increasing amount of dam damage or failure due to aging, earthquakes occurrence and unusual changes in weather. For this reason, dam safety is gaining more importance than ever before in terms of disaster management at a national level. Therefore, the government is trying to come up with an array of legal actions to secure consistent dam safety. Other dam management organizations are also taking various institutional and technical measures for the same purpose. In this study, Dam Safety Management System, KDSMS, has developed for consistent and efficient dam safety management. The KDSMS consists of dam and reservoir data, a hydrological information system, a field inspection and data management system, a instrumentation and monitoring system including earthquake monitoring, a field investigation and safety evaluation system, and a collective information system. The KDSMS is a kind of enterprise management system which has been developed to deal with safety management of each field, research center, and headquarter office and their correlation as well as detailed safety information management.
Bond Characteristics of FRP sheet to Various Types under Cyclic Load
Ko, Hune Bum ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 131~138
Fiber-reinforced polymer (FRP) sheets have been successfully used to retrofit a number of existing concrete buildings and structures because of their excellent properties (high strength, light weight and high durability). Bond characteristics between FRP sheets and concrete should be investigated to ensure an effective retrofitting system. RC structures strengthened with FRP sheets are often subjected to cyclic load (traffic, seismic, temperature, etc.). This research addresses a local bond stress-slip relationship under cyclic loading conditions for the FRP-concrete interface. 18 specimens were prepared with three types of FRP sheets (aramid, carbon, and polyacetal) and two types of sheet layer(one or two). The characteristics of bond stress-slip were verified through experimental results on load-displacement relationship.
An Improvement of the State Assessment for Concrete Floor Slab by Damage Type Breakdown
Hwang, Jin Ha ; An, Seoung Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 139~148
The direct inspection of the outward aspects by field engineers is the important and critical part for structural safety assessment according to the related reports. This study presents an improved method of the state assessment for concrete floor slab by separating and evaluating the individual damage types. First, the various types of damage symptoms are separated, which have been included and dealt in a group. Secondly, they are weighted and scored independently based on the present guide and references. Overall procedures other than the above are retained as same as possible to avoid the confusion. The proposed method is applied and tested to a performed assessment project for a bridge for validation. The result shows that it is reasonable and applicable in respect that it is able to make up for the controversial points of the present guide revealed in practices. Careful check of excessively deteriorated parts in addition to the reasonable assessment of system by this method grants the structural repair and reinforcement propriety and economy, and assures of more safety. Twofold appraisal of this approach expands the applicable areas of value engineering to the structural maintenance.
A Study on the Relation between Dynamic Deflection Modulus and In-Situ CBR Using a Portable FWD
Kang, Hee Bog ; Kim, Kyo Jun ; Park, Sung Kyoon ; Kim, Jong Ryeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 149~155
The road construction, as part of effort to ease the worsening traffic, has been underway throughout the nation, while the existing road has been increasingly losing its load carrying capacity due to such factors as heavy traffic and weathering. In the case of site, the soil type, plasticity index, and specific gravity were SC, 12.2%, and 2.66, respectively. The maximum dry density, optimum moisture content and modified CBR were
(Modified Compaction D), 13.6%, and 16.2%, respectively. A correlation of coefficient expressed good interrelationship by 0.90 between the CBR estimated from a dynamic penetration index of dynamic cone penetrometer test and a deformation modulus converted from a dynamic deflection modulus obtained from a portable FWD test.
Fatigue Durability of Cramp Joint at Precast Highway Deck Slabs
Kim, Yoon Chil ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 156~162
The fatigue durability test using the actual size beam was performed with a cramp joint in order to apply to the highway bridge deck slab. Three types of beam were investigated for durability performance by considering stress conditions in real bridge deck slabs, 1) A beam with major shear force applied at the joint (RC Type) 2) A beam with major bending moments applied at the joint (PSC Type) 3) A beam with the pure shear applied at the joint. The experiment for beams with cramp joints showed that the cramp joint had enough durability for fatigue regardless of the overlaid length of the looped distribution bars under the current design strength level. Moreover, it was clarified that the enough durability for fatigue under the load repetition was achieved by increasing the joint span grater than 1.5D with the consideration of the deformation due to reduction in joint stiffness.
A Study on Carbonation Velocity for Concrete Structures
Kim, Jong Ho ; Oh, Kwang Chin ; Park, Seung Bum ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 163~170
The carbonation velocity is produced an effect on carbon dioxide(
) density of surrounding near structures, the concrete quality and types of structures and this study was accomplished to draw a conclusion for estimated formula of carbonation velocity coefficient with various factors by the concrete quality on the base of the data of the durability surveyed in Korea. From the results of analysis of carbonation velocity, the followings were appeared. It is analyzed that carbonation velocity of the structures under urban area is 1.5 times faster than the rural area in the bridges case and it is 2.5 times faster than the rural area in the tunnels case. And the order of carbonation velocity of the structures under urban area is the buildings, the tunnels, the bridges and they are evaluated to progress about 2.7 times and 1.3 times faster than the bridges. In the rural area, the bridges are evaluated to progress about 1.3 times faster than the tunnels and it is analyzed that the carbonation velocity of the upper structures of the bridges under urban area is about 1.3 times faster than lower structures. The results which is compared to estimated formula of carbonation velocity coefficient of Kishitani equation which is generally applied for convert compressive strength into W/C ratios, most of those velocity of structures is faster than the results of Kishitani equation.
Flexural Behavior of RC Beams Strengthened with CFRP Plate Using Multi-directional Channel-type Anchorage System
Hong, Ki Nam ; Han, Sang Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 171~180
The aim of this paper is to clarify the structural performance of RC beams strengthened with Carbon Fibre Reinforced Polymer(CFRP) plates using channel-type anchorage system. Twelve RC beams were specifically designed without and with a channel-type anchorage system, which was carefully detailed to enhance the benefits of the strengthening plates. All the twelve beams were identical in terms of their geometry but varied in their internal reinforcement, concrete strength. All the beams were tested under four point bending and extensively instrumented to monitor strains, cracking, load capacity and failure modes. The structural response of all the twelve beams is then critically analyzed in terms of deformability, strength and failure processes. It is shown that with a channel-type anchorage system, a brittle debonding failure of a strengthened beam can be transformed to an almost ductile failure with well-defined enhancement of structural performance in terms of both deformation and strength.
Design Automation System for Concrete Slab Bridge using Vector Graphic
Lho, Byeong Cheol ; Kim, Jeong Hoon ; Kim, Jong Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 181~192
A Web-based design automation system for concrete slab bridge has been developed to manage the resultant documents as well as to speed up the repetitive design process. Manipulation of engineering drawings in the Web page is one of the critical functions needed for Web-based design automation. Active Server Pages (ASP) is used to that collects design parameters in the database, and eXtensible Markup Language (XML) and XML-based vector graphics are expected to facilitate the representation of engineering drawings in the Web page. In this paper, we present how we used XML and Scalable Vector Graphics (SVG) to compose engineering drawings and represent them in the Web page. XML Data Island we designed to define drawing components turned out effective in manipulating the engineering drawings in the Web page.
3-D Concrete Model Using Non-associated Flow Rule in Dilatant-Softening Region of Multi-axial Stress State
Seong, Dae Jeong ; Choi, Jung Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 2, 2008, Pages 193~200
Cohesive and frictional materials such as concrete and soil are pressure dependent. In general, failure criterion for such materials inclined with respect to positive hydrostatic axis in Haigh-Westergaard stress space. Consequently, inelastic volumetric strain always positive with associated flow rule. In this study, to overcome this shortcoming, non-associated flow rule which controls volumetric component of plastic flow is adopted. Numerical analysis based on a constitutive model using nonuniform hardening plasticity with five parameter failure criterion and non-associated flow rule has conducted to predict concrete behavior under multi-axial stress state and verified with experimental result.