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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 14, Issue 6 - Nov 2010
Volume 14, Issue 5 - Sep 2010
Volume 14, Issue 4 - Jul 2010
Volume 14, Issue 3 - May 2010
Volume 14, Issue 2 - Mar 2010
Volume 14, Issue 1 - Jan 2010
Selecting the target year
Structural Behavior of RC Roof Slab under Cyclic Temperature Load
Seo, Soo-Yeon ; Yoon, Seung-Joe ; Cho, Yong-Man ; Choi, Gi-Bong ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 67~74
A variation of temperature acting on a RC roof slab causes a change of stress in concrete since it expands during summer and is compressed during winter. This behavior repeats annually and makes an affection to the structural capacity of member for both serviceability and ultimate level. In this paper, a cyclic temperature loading variation is calculated by analyzing the weather data of Korea for 20 years. In addition, an experimental work is planned to find the long term effect of temperature variation. Six RC slab are made with same dimension. Test parameters are loading duration (10, 20, 30 year) and whether it has pre-damage or not. Observation of stiffness variations according to cyclic loading period shows that the serious stiffness drop happens after 10 year's cyclic loading at summer while after 30 year's loading at winter. From the fracture test about slabs damaged by long term cyclic loading, however, the capacity of member such as initial stiffness and maximum strength were not changed except yield strength according to the period of long term cyclic loading. The yield strength tends to decrease after 20 year's cyclic loading.
Effect of Concrete Water-Binder Ratio and Mineral Admixture on Corrosion Estimation by Electro-Chemical Method
Yang, Eun-Ik ; Choi, Yoon-Suk ; Han, Sang-Hun ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 75~81
In this study, when concrete properties are changed by concrete mix proportions or blending of admixtures, the characteristics of electro-chemical method for corrosion assessment of the embedded steel are compared and its causes are analyzed. According to the results, when the ratio of corroding area was less than 10%, the half-cell method was affected by concrete properties. In the case of specimen blended admixtures, it is possible to assess the high-corroded steel qualitatively using the half-cell method. For the polarization resistance method, though the corroding area was less than 10%, it has not affected by concrete properties. However, in case of specimen blended admixtures, the corrosion level of steel was underestimated than OPC specimens having a similar corroding area.
Seismic Resistance Response of Railway Station Building Retrofitted by Metallic Dampers
Lee, Hyun-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 82~88
The purpose of this research is a seismic capacity evaluation and strengthening of existing railway station buildings, which were constructed before the seismic design code activated. The seismic capacity of 2nd story RC station building is evaluated by using nonlinear time-history analysis. Analysis results are checked by story drift ratio and story shear, which are described in design code. As a result, the story shears are exceeding the base shear of the design code, the appropriate seismic strengthening methods are needed. To improve the seismic capacity, metallic dampers are used. Evaluation parameters are metallic damper shape and damper installation methods. Dampers are installed in four places in X and Y directions of station buildings. By reviewing of time-history analysis results, the metallic damper, which is installed inverted K-brace type, shows a better seismic performance than other damper shape and installation methods.
Analytical Modelling for Recarbonation Process of Concrete Repaired with Patching Repair Material
Do, Jeong-Yun ; Kim, Doo-Kie ; Song, Hun ; Jo, Young-Kug ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 89~96
This study presented the analytical evaluation model effective in the concrete structure repaired with a patching material. The model considered the effect of the repair material on carbon dioxide penetration into the repaired concrete as evaluating the remaining service life of the CO2-deteriorated concrete structure after repair. The diffusion profiles of carbon dioxide as well as the carbonated concrete were effectively able to be modelled with analytical method based on Fick's 1st diffusion law. The evaluation of the model equation showed the good result and rational process quantitatively and numerically to evaluate the remaining service life of the repaired concrete structure after repair.
Behavior Due to Construction Step in Steel Deck Bridge by Large Block Construction Method
Lee, Seong-Haeng ; Kim, Kyoung-Nam ; Hahm, Hyung-Gil ; Jung, Kyoung-Sup ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 97~105
The displacements of steel deck bridge due to construction step are measured, and three dimensional analysis with full modeling is carried out to compare with the measured results. Three dimensional structural analyses considering construction step by large block construction method are accomplished with verified model. The conclusions are as follows. 1. Comparing the data of grid analysis with the result of 3D full modeling in steel deck bridge, the design method using grid analysis has a limit for describing the displacements of curved bridge. The analysis of 3D full modeling has been proved as more accurate method. The differentiation of results in two methods is about 10%~20%. 2. It is verified that the maximum displacement of during construction is 1.7 times larger than the displacement of final construction. 3. The bridge behavior considering the construction step is somewhat different from that of final stage in whole structure and the displacement and stress during construction is larger than that of final construction. Therefore, it needs the reasonable structural design considering the construction step to get economical efficiency and a high competitive construction.
An Analytical Study on the Behavior of Slab Structure Considering the Remodeling
Choi, Hoon ; Joo, Hyung-Joong ; Lee, Seung-Sik ; Yoon, Soon-Jong ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 106~112
Due to the improvement and stabilization of the social environment, construction market in the urban region is under shrinking. According, researches to lengthen the service life of the existing building structures are under the way through the remodeling or maintenance of deteriorated structures other than the new constructions. Similar situations are widely discussed in the domestic building construction market and the social importance of the remodeling of the existing building structures is increased. Although the structural stability of the building is uncertain due to the frequent repairing and structural changing, the remodeling works are usually conducted. In general, documents such as drawings and calculations for the design of the deteriorated structure to be remodeled are not kept. Accident at the remodeling site frequently occur because of the lack of thorough understanding of changed situations such as loadings, loading paths, changing of the mechanical properties of material, etc. In this paper, using the finite element analysis method, we investigated the structural behaviors of slab in the remodeling building and the results are applied to remodeling construction, and the appropriateness of the remodeling works are evaluated.
Dynamic Analysis of Long-span Arch Bridge by Fracturing Hangers
Yhim, Sung-Soon ; Kong, Min-Sik ; Yoo, Yi-Seul ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 113~120
Recently, various evaluations concerning structural stability under construction step and completely constructed step have been executed during a Long-span Arch Bridge designing procedure. However, the breakage of cable-hangers of arched bridge in unexpected accident or periodic cable-replacement has not been considered. Therefore, the purpose of this study is that analyzing structural safety of arched bridge when the cable-hangers being fractured by that reasons. Dynamic analysis are performed by idealizing impact load to three types of impact functions as fracturing the cables. Consequently, when the hangers are fractured, the maximum tensile force by dynamic analysis is larger than those by static analysis. Therefore, the dynamic analysis is demanded to accurately obtain the responses for the structural stability with a realistic impact loading model in the breakage and replacement of cable hangers of long-span arched bride. Moreover, the analysis method and results in this study can be used to basic criteria in design.
An Experimental Study of Perfobond FRP-Concrete Composite Beam
Yoo, Seung-Woon ; Kook, Moo-Sung ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 121~127
An experimental study of composite beam with perforated fiber reinforced polymer(FRP) plank as a permanent formwork and the tensile reinforcement was performed. A combined formwork and reinforcement system can facilitate rapid construction of concrete members since no conventional formwork is needed, which requires time consuming assembly and dismantling. In order for a smooth FRP plank to act compositely with the concrete, the surface of the FRP needs to be treated to increase its bond properties. Aggregates were bonded to the FRP plank using a commercially available epoxy and perforated web of plank. No additional flexural or shear reinforcement was provided in the beams. For comparison, two control specimens were tested. One control had no perforated hole in the web of FRP plank and the other had internal steel reinforcing bars instead of the FRP plank. The beams were loaded by central patch load to their ultimate capacity. This study demonstrates that the perforated FRP plank has the potential to serve as a permanent formwork and reinforcing for concrete beam.
An Analytical Study on Application of Section Increment at Internal Support with External Prestressing Method to Continuous Steel Plate Girder Bridge
Shim, Jae-Joong ; Hong, Sung-Nam ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 128~136
It has been verified that there is an effect of diminishing in section bringing in internal core section reinforcement and external prestressing rather than general plate-girder bridge as a consequence of analysis. In particular, positive effect was seen in the aspect of usability when external prestressing was in application as rises gained from it minimized the hanging down of a bridge. Based on the result of analysis, a sectional diagram applicable per number of girder has been illustrated which made it possible to estimate the intensity of internal stress in the futurewhere number of girder is limited to 4 and regression equation is presented after regression analysis has been carried out.
Behavior of Floating Base Plate by Stress Delivery Mechanism
Chung, Jin-Hyuck ; Jung, Hye-Kwun ; Lee, Song ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 137~144
Up to now, common studies of top base have concentrated upon bearing capacity and settlement by in-situ loading test in Japan and Korea. But most of all preceding study for top base must analyze how to deliver overburden loading on bottom of foundation. Therefore, in this study, the stress delivery mechanism of Top-Base Foundation developed in Japan and Floating Top Base developed in Korea is investigated through numerical analysis and laboratory model test. Analyzing the load delivery mechanism of top base, it was found that the division rate of load reduction of top base for overburden load was largest in peripheral skin friction between the top base and the crushed stone. Further, total stress dispersion angle of Top-Base Foundation including internal stress dispersion effect of top base was
and total stress dispersion angle of Floating Top Base was
Flexural Strengthening Characteristic of Sleeper Member Traditional Wooden Architecture
Kim, Jeong-Sup ; Cho, Cheol-Hee ; Shin, Young-Seok ; Cho, Youn-Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 145~152
This study investigates experimentally flexural behavior and CFB(Carbon Fiber Bar) reinforcing effects of timber sleeper in traditional storied tower house. As a test result, standard sleepers without CFB(Carbon Fiber Bar) reinforcement show flexural cracks at the bottom member at the beginning of loading stage and leads to fracture. However, reinforced specimens with CFB show initial shrinkage at the upper part of specimen by compression, instead of flexural cracks at the bottom, and finally show compressive failure or fracture after failure of CFB and it proves that reinforcing effects by CFB are exerted from early loading. Reinforced specimens showed higher strength in yield strength by 6%~38%, and ultimate strength by 8%~17%, than those of standard specimens. Reinforced specimen is considered that specimen with flexural reinforcement using CFB can expect flexural deflection control effect. Reinforced specimen shows higher ductile coefficient increase of average 141% compared than standard specimens and it proves that higher structural ductile behavior can be expected in reinforced specimens.
Performance of RC Beams Strengthened with FRP-Aluminum Composite Hollow Beam Under the Fire
Lee, Jae-Ik ; Choi, Yeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 153~160
The widespread deterioration of concrete structures has required the development of new and innovative materials and technologies for strengthening and repair. Recently Fiber reinforced polymer(FRP) composites have received widespread attention as materials for the strengthening and repair of the deteriorated concrete structures. This paper presents the results of Fire-performance of RC beams strengthened with FRP-Aluminum composit hollow beams. Test results show that the higher-damaged FRP strengthened RC beams are more vulnerable to the fire and decrease the effect of FRP strenthening.
Modified HAZUS Method for Seismic Fragility Assessment of Domestic PSC-I Girder Bridges
Seo, Hyeong-Yeol ; Yi, Jin-Hak ; Kim, Doo-Kie ; Song, Jong-Keol ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 161~170
To reduce the amount of seismic damage, several design codes are being improved considering the earthquake resistant systems, and many researches are being conducted to develop the earthquake damage evaluation techniques. This study develops the Korean seismic fragility function using the modified HAZUS method applicable to PSC-I girder bridges in Korea. The major coefficients are modified considering the difference between the seismic design levels of America and Korea. Seismic fragility function of the PSC-I girder bridge (one of the standard bridge types in Korea) is evaluated using two methods: numerical analysis and modified HAZUS method. The main coefficients are obtained about 70% of the proposed values in HAZUS. It is found that the seismic fragility function obtained using the modified HAZUS method closes to the fragility function obtained by conventional numerical analysis method.
A Durability Assessment on Complex Deterioration of Concrete with Ground Granulated Blast-Furnace Slag Replacement
Lee, Seung-Hoon ; Kim, Hyung-Doo ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 171~175
This paper presents the experimental results of frost durability characteristics including freezing-thawing and de-icing salt scaling of the concrete for gutter of the road and marine structure. Mixtures were proportioned with the three level of water-binder ratio(W/B) and three binder compositions corresponding to Type I cement with 0%, 30% and 50% GGBS(Ground granulated blast furnace slag) replacement. Also, two different solutions of calcium chloride were used to evaluate their effect on the frost durability resistance. Specially, in case of complex of freezing and thawing with salt and carbonation, the deterioration of concrete surface is evaluated. Test results showed that the BFS30 and BFS50 mixture exhibited higher durability and lower mass loss values than those made with OPC mix and the use of GGBS can be used effectively in terms of economy and frost durability of the concrete to be in complex deterioration. Therefore, the resistance to complex deterioration with freezing-thawing was strongly influenced by the strength and the type of cement.
An Analysis and Retrofit of U-rib Fatigue Cracks in the Steel Deck Bridge
Ryu, Duck-Yong ; Jung, Hie-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 176~183
In the steel deck box girder bridges, the deck is composed of deck plate, longitudinal and lateral direction ribs. The bridge, that is considered in this study, has been used for about 40 years and, recently, several cracks were found in the connection area of U-ribs. Further, additional cracks were occurred after some lateral rib plates and longitudinal frames were attached for the purpose of reinforcement. Therefore, the connection method in the U-ribs reinforcement was changed from the bolting to the weldment to get rid of stress concentration and further cracking. In this study, the stress in the U-ribs connection was analysed numerically and variable amplitude stress for the real traffic loads was measured experimentally before and after the frame reinforcement. Finally, the effects of reinforcement method were investigated and discussed.
Correlation Between Crack Widths and Deflection in Reinforced Concrete Beams
Kang, Ju-Oh ; Kim, Kang-Su ; Lee, Deuck-Hang ; Lee, Seung-Bea ;
Journal of the Korea institute for structural maintenance and inspection, volume 14, issue 2, 2010, Pages 184~192
The member deflection is one of the most important considerations for the serviceability evaluation of reinforced concrete (RC) structures, and the concept of the effective moment of inertia has been generally used for its estimation. However, the actual service load applied on an existing RC beam may not be easily obtained, for which the estimation of beam deflection by existing methods can be difficult to obtain. Therefore, based on the correlation between cracks and deflection in a RC beam, this study proposed a method to estimate the deflection of RC beams directly from the condition of cracks not using the actual loads acting on the member as its input data. The proposed method extensively utilized the relationships among sums of crack widths, average strains, and curvatures, and modification factors obtained from regression analysis were also introduced to improve its accuracy. The deflections of members were successfully estimated by the proposed method independent from applied loads, which was also easy to apply compared to the existing methods based on the effective moment of inertia.