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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
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Journal DOI :
Korea Institute for Structural Maintenance Inspection
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Volume & Issues
Volume 20, Issue 5 - Sep 2016
Volume 20, Issue 4 - Jul 2016
Volume 20, Issue 3 - May 2016
Volume 20, Issue 2 - Mar 2016
Volume 20, Issue 1 - Jan 2016
Selecting the target year
Cracking Behavior of Concrete Box Culvert for Power Transmission Due to Drying Shrinkage
Woo, Sang-Kyun ; Chu, In-Yeop ; Kim, Ki-Jung ; Lee, Yun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 1~8
DOI : 10.11112/jksmi.2016.20.1.001
The purpose of this study is to predict the cracking behavior and suggest the method of controlling the cracking in concrete box culvert for power transmission due to differential drying shrinkage. Drying shrinkage cracking is mainly influenced by the moisture diffusion coefficient that determines moisture diffusion rate inside concrete structures. In addition to the diffusion coefficient, surface coefficient of concrete surface and relative humidity of ambient air simultaneously affect the moisture evaporation from concrete inside to external air outside. Within the framework of drying shrinkage cracking mechanism, it is necessary to perform the numerical analysis, which involves these three influencing factors to predict and control the shrinkage cracking of concrete. In this study, moisture diffusion and stress analysis cor responding to drying shrinkage on concrete box culvert are performed with consideration of diffusion coefficient, surface coefficient, and relative humidity of ambient air. From the numerical results, it is found that cracking behavior due to differential drying shrinkage of box culvert shows the different feature according to three influencing factors and the methodology of controlling of drying shrinkage cracks can be suggested from this study.
The Fundamental Study on Quality Properties of Binary Blended Concrete according to Water Reducing Performance of Chemical Admixture and Estimation Equation of Compressive Strength
Kim, Kyung-Hwan ; Oh, Sung-Rok ; Choi, Byung-Keol ; Choi, Yun-Wang ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 9~17
DOI : 10.11112/jksmi.2016.20.1.009
In this study, binary blended concrete mix with fly ash and ground granulated blast furnace slag was prepared according to 3 level of water reduction performance of chemical admixture (0%, 8% and 16%) and 3 level of water-cement ratio (40%, 45% and 50%) for evaluation of quality properties of binary blended concrete according to performance of chemical admixture. concrete mix was carried out repetition test of three times in order to secure the reliability. As a result, compressive strength according to performance of chemical admixture was found that difference of strength was about 20% occurred, chemical admixture was showed that a great influence on qualities of concrete. In addition, reflected the effect of performance of chemiacal admixture, prediction model equations for concrete compressive strength was proposed, it was found that more than 85% of the high correlation.
The Ductile Behavior Test of the Ultra High Perfomance Fiber Reinforced I Beam by the Combination of the Fiber and Group of Reinforcement Bar
Park, Jin-Young ; Han, Sang-Mook ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 18~24
DOI : 10.11112/jksmi.2016.20.1.018
The purpose of this study is to induce the ductile behavior of the Ultra High Perfomance Concrete Reinforced I beam by substituting the part of steel fiber for bundle of reinforcing bars. Experiment of flexural behavior of the Ultra High Performance Concrete I shaped beam with the combination of the steel fiber and bundle of reinforcement bars was carried out. The volume fractions of steel fiber are 0%, 0.7%, 1%, 2%. The bundle of reinforcing bars and prestressing wire are used to restrain the concrete in compression zone. Length of bundle of reinforcing bar and prestressing wire is the one of test factors. The 9 Reinforced UHPC I shaped beam were made with these test factors. Not only steel fiber but also bundle of longitudinal reinforcing bar has effect to induce the ductile behavior of Reinforced UHPC I beam. The combination of 0.7% or 1.0% steel fiber and bundle of reinforcing bar showed the effective ductile behavior of I beam. The relationship of load-deflection and the crack pattern indicate the usefulness of the bundle of the longitudinal bar which has small diameter with close arrangement each other.
An Experimental Study on the Period of Cold Joint Occurrence Effecting Shear Bond Performances of UHSCC
Kim, Min-Seong ; Yang, Hyun-Min ; Lee, Han-Seung ; Cho, Keun-hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 25~32
DOI : 10.11112/jksmi.2016.20.1.025
The purpose of this study is to evaluate the performance on the compressive bonding shear strength of ultra-high strength steel fiber reinforced cementitous composites(UHSCC). As a result of compressive bonding shear strength through Direct shear test, It was found that the specimen(
) of NC(Normal concrete) + NC showed similar compressive bonding shear strength at whole experimental level. On the other hand, the specimen of UHSCC + UHSCC showed decrease of compressive bonding shear strength from after 30 minutes of the retarded placement than 0 minute. As a result of analyzing failure mode of bonding interface, It was found that the specimen of NC + NC showed mixed failure at whole experimental level. In case of the specimen of UHSCC + UHSCC, it showed interface failure from the specimen that are 30 minutes, 60 minutes and 90 minutes of delay of concrete placing. As a result of analyzing XRD test in terms of the placement interface on the specimen of NC and UHSCC, relatively much amount of
was detected from the specimen of UHSCC than that of NC. It is judged that the most of main components of coating film shown in the specimen of UHSCC is
. In conclusion, it is judged that UHSCC which is made from after 30 minutes of delay of concrete placing is unable to be used as structural member because of deterioration of bonding performance. From later study, it is judged that the improvement of bonding performance from the part of cold joint occurrence is necessary through the interface preparation method.
Development of Performance Prediction Method for Bridge and Tunnel Management Decision-making
Lee, Dong-Hyun ; Kim, Ji-Won ; Jun, Tae-Hyun ; Jeong, Won-Seok ; Park, Ki-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 33~40
DOI : 10.11112/jksmi.2016.20.1.033
In this study, using the Cost Prediction Model and Performance Prediction Model have developed a way to estimate future management costs and performance for bridge and tunnel by Network Level. Studies to date have primarily focused on the single facility, it is difficult to apply to the analysis of the Network Level. This study, items used as an index of 'Special Act for the Safety Control of Public Structures' was added to Usability and Functionality to Status. Action period and annual budget for each facility can be estimated through the Basic and Advanced analysis. In addition, we verified the technical feasibility through case analysis.
Effect of Shear Key and Edge Length of Near Surface-Mounted FRP Plate in Concrete
Seo, Soo-Yeon ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 41~47
DOI : 10.11112/jksmi.2016.20.1.041
This paper presents a bond test to find the effect of shear key and edge length from the bonded FRP in near surface-mounted(NSM) retrofit using FRP plate. Main parameters in the test are the location and size of shear key and the edge length. For the test, 10 specimens were made by embedding FRP plate of
concrete block and fixing it by using epoxy. Tensile load was applied to the FRP of the specimens until failure and was recorded at each load increase. In addition, the bond slip and elongation of FRP were measured during the test. From the test, it was found that the further the shear key located from the loading, the higher strength we could get. The bond strength inversely depended on the size of shear key. Especially, when the size of shear key was to be lagger than certain size, the bond strength decreased to very low value; even less than that of the case without shear key. The bond strength somewhat increased corresponding to the increase of edge length from the bonded end of FRP to loading in spite of same bond length. The bond-slip between FRP and concrete governed overall deformation in the bond test of NSM FRP so that the effect of excessive slip is necessary to be considered in the design.
Correlation Effect of Maintenances on Probabilistic Service Life Management
Kim, Sunyong ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 48~55
DOI : 10.11112/jksmi.2016.20.1.048
The assessment and prediction of service life of a structure are usually under uncertainty so that rational probabilistic concepts and methods have to be applied. Based on these rational assessment and prediction, optimum maintenance strategies to minimize the life-cycle cost and/or maximize the structural safety can be established. The service life assessment and prediction considering maintenance actions generally includes effects of maintenance types and times of the structural components on the service life extensions of structural system. Existing researches on the service life management have revealed the appropriate system modeling considering the correlation among the components is required for system reliability analysis and probabilistic service life estimation. However, the study on correlation among the maintenance actions is still required. This paper deals with such a study for more effective and efficient service life management. In this paper, both the preventive and essential maintenances are considered for the extended service life estimation and management.
The Influence of Nano Synthesized Polymer Paint on Durability of Concrete
Beak, Jong-Myeong ; Park, Youg-Keol ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 56~63
DOI : 10.11112/jksmi.2016.20.1.056
This experiment was compared and analyzed between the original surface paint through chloride penetration, neutralization, freeze-thaw and chemical corrosion resistance measuring internal structure and volume of voids in order to evaluate the effect of increase in durability of the newly modeled nano synthesized polymer paint painted on concrete surface which results improvement on air permeability to increase the durability of concrete structures. The test result of measuring volume of void and inner structure, concrete, spreaded with nano synthesized polymer paint, showed decreasing trend of pore volume in the range of less than
and more than
. Also, using an electron microscope inside showed tightness of hydration texture. Chloride penetration depth of concrete, painted with nano synthesized polymer paint, was decreased more than 92% compared to non-painted concrete and 70% with water-based epoxy painted concrete. Especially, chemical corrosion resistance test set with aqueous solution of 5% sulfuric acid, non-painted concrete and water-based epoxy painted concrete showed weight loss of 4% after dipping for 12 days. On the other hand, concrete painted with nano synthesized polymer paint showed 1.7% weight loss under the same condition. Also, it showed great result of appearance under the criteria of Tsivilis et al.
An Evaluation of Flexural Performance of Composite Beam with Ultra High Performance Concrete Deck and Inverted T-Shaped Steel Girder
Yoo, Sung-Won ; Joh, Chang-Bin ; Choi, Kwang-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 64~71
DOI : 10.11112/jksmi.2016.20.1.064
In this paper, when the composite beam is made with UHPC deck and steel girder, the steel girder takes the form of the inverted-T shape without top flange because of high strength and stiffness of UHPC deck. There is no evaluation by experiment and analysis about the shear connector behavior on the web of steel girder and flexural behavior of inverted-T shape composite beam. By this reason, this study compares between experiment and analysis by using tension softening model of UHPC on the basis of flexural test results of 16 members considering compressive strength of UHPC, spacing of stud and thickness of deck as variables. The results of tensile strength of UHPC by inverse analysis were 6.57 MPa(in case of 120 MPa) and 9.57 MPa(in case of 150 MPa). In case of the test members with small stud spacing, the results of analysis and test were close clearly, and the test members with thick deck and low UHPC compressive strength also similar, but effects were small. As it compared between analysis and experiment totally, the results of analysis and experiment agree well. So the tension softening model of UHPC is reasonably reflected on the real behavior of composite beam of UHPC.
Hysteresis Characteristics of Buckling Restrained Brace with Precast RC Restraining Elements
Shin, Seung-Hoon ; Oh, Sang-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 72~84
DOI : 10.11112/jksmi.2016.20.1.072
The conventional brace system is generally accepted as the lateral load resisting system for steel structures due to efficient story drift control and economic feasibility. But lateral stiffness of the structure decreases when buckling happens to the brace in compression, so that it results in unstable structure with unstable hysteresis behavior through strength deterioration. Buckling restrained brace(BRB) system, in which steel core is confined by mortar/concrete-filled tube, represents stable behavior in the post-yield range because the core's buckling is restrained. So, seismic performance of BRB is much better than that of conventional brace system in point of energy absorption capacity, and it is applied the most in high seismicity regions as damper element. BRBs with various shaped-sections have been developed across the globe, but the shapes experimented in Korea are now quite limited. In this study, we considered built-up type of restraining member made up of precast reinforcement concrete and the steel core. we experimented the BRB according to AISC(2005) and evaluated seismic performances and hysteresis characteristics.
Evaluation on Flexural Performance of Precast Decks with Ribbed Joint by FEM
Oh, Hyun-Chul ; Chung, Chul-Hun ; Kang, Myoung-Gu ; Park, Se-Jin ; Shin, Dong-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 85~94
DOI : 10.11112/jksmi.2016.20.1.085
In this study, a non-linear FEM model is presented to predict the static flexural performance of precast bridge decks with ribbed joint and is verified with previous experiment results through comparison. The several theory of material properties were applied to each mechanical properties in FEM model and FEM model's input variables were determined through experiment result and parametric study. The FEM results showed good accuracy in predicting the structural performance of the specimens and FEM model's average error rate was 5%. Also, each specimen's cracking aspect and failure mode can be predicted through FEM's plastic strain distribution. Thus, this FEM model can be used effectively for predicting the ultimate behavior and parametric study to development of design formula for joint.
Proposal of the Modified Management Criteria Value in Earth Retaining Structure using Measured Data
Kim, Jueng-Kyu ; Park, Heung-Gyu ; Nam, Jin-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 95~103
DOI : 10.11112/jksmi.2016.20.1.095
The absolute value management method is widely used in the most of the earth retaining construction, which evaluates the safety by comparing measurement result and management criteria. Therefore, the management criteria is the standard to evaluate the safety of the site, and in other words, the criteria is a direct factor of the evaluation. That means that the safety of the site can not be acquired if the management criteria is not proper, even though the measurement system is perfectly set. However, many of field technicians do not have rely on the current management criteria, and they even recognize the necessity of the revision. Therefore, in this study, the necessity of the revision was studied. Also, the optimum criteria selection and the application were performed based on the test results of earth retaining deflection and probabilistic theory. The absolute value management method was used for this study. The details are tabulated.
A Study on Evaluation of Floor Vibration for Steel Frame Modular Housing
Kim, Jong-Sung ; Jo, Min-Joo ; Kim, Seung-Hun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 104~111
DOI : 10.11112/jksmi.2016.20.1.104
The steel frame modular housing of which the research and development has been actively carried out recently cannot be constructed through monolithic placement like the reinforced concrete deck of general structure due to the characteristics of construction method of production in the factory and assembly on the site. And floor vertical vibration and deflection caused by inhabitants' activities may become an important issue in the aspect of usability evaluation due to a decrease in the section size of member, a decrease in weight, and so on. Therefore, this study evaluated the vibration performance of deck by using formula of AISC Design Guide 11(hereinafter AISC formula) which was practically used in general for modules where a stud was and wasn't installed at the center of beam in the longitudinal direction in the modular housing to be studied, and examined the applicability of AISC formula through comparison with the results of analysis using a general-purpose analysis program. On the basis of this, a structural cause for an error to occur between analysis result and AISC formula in the deck of module in which a stud was installed was analysed, and measures for considering this were suggested. Besides, an analysis model with the variables of measures for improving the floor vibration performance of modular housing to be studied was established. And measures having excellent vibration performance and economic feasibility were suggested through vibration response analysis and economic evaluation.
Effect of Plant Roots Penetration and Watertightness of Asphalt Sheet according to the Cracks Width of Press Concrete
Um, Tae-Ho ; Kim, Young-sam ; Lee, Jong-suk ; Shin, Hong-chul ; Kim, Young-geun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 112~117
DOI : 10.11112/jksmi.2016.20.1.112
For artificial ground greening construction without root-proofing layer, this research reviewed the effect on watertightness of asphalt waterproofing layer by plant roots penetration based on crack width, and crack penetrated roots. Experiment on concrete crack width was performed with three conditions such as 0.15, 0.30, and 0.45 mm, and all three conditions confirmed that all plant roots penetrations were made through crack area in 12 ~ 18 months. In addition, according to evaluation of effects on waterproofing layer by crack penetrated plant roots and in condition of 0.45 mm crack width, it indicated that penetration is made on asphalt waterproofing layer in 12 months due to roots penetration.
Humidity Change Rate Analysis for Various Waterproofing Method in Underground Structures During Winter Season
An, Ki-Won ; Lee, Yeon-Sil ; Lee, Jung-Hoon ; Song, Je-Young ; Oh, Sang-Keun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 1, 2016, Pages 118~125
DOI : 10.11112/jksmi.2016.20.1.118
This paper proposes the appropriate waterproofing methods for underground structures after applying different types of waterproofing materials on the concrete test specimens and selecting the best results out of humidity testing in winter conditions. Results of the testing showed that the underground structures absolutely require relevant waterproofing application based on the environmental conditions; when applied with interior waterproofing, the results showed that the concrete maintained high level of humidity and reinforcing steel within the concrete layer corroded. However, when applied with exterior waterproofing, it was shown that the waterproofing layer prevent direct contact with water and concrete, thereby protecting the concrete structure and improving overall durability. It follows that during underground structure construction, exterior waterproofing methods are have shown by an effective method for improving the durability as well as providing a comfortable interior environment for users.