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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
Shotcrete-Retrofit of Shear Walls with an Opening
Choi, Youn-Cheul ; Choi, Chang-Sik ; Kim, Hyun-Min ; Lee, Li-Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 71~80
Because of the characteristics relating to high tensile ductility, High Performance Fiber Reinforced Cementitious Composites (HPFRCC) are studied to be adopted in repair and retrofit of buildings. A series of three shear wall specimens was tested under constant axial stress and reversed cyclic lateral loading in order to evaluate the seismic retrofit that had been proposed for the shear wall with the opening. The retrofit involved the use of newly developed ECC and MDF(Macro Defect Free), both of which are sprayed through the high pressure pump, over the entire face of the wall. The results indicate that two difference types of retrofitting strategy make the different effects of a rise in the strength and ductility of each specimen.
A Suggestion for Carbonation Prediction Using Domestic Field Survey Data of Carbonation
Kwon, Seung-Jun ; Park, Sang-Sun ; Nam, Sang-Hyeok ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 81~88
Among deteriorations of concrete due to environmental exposure, carbonation problems of concrete structures have increased in urban and underground structures. But conventional carbonation-prediction equations that were proposed by foreign references, can not be applied directly to the prediction of carbonation for domestic concrete structures. The purpose of this study is to propose a prediction equation of carbonation depth by considering domestic exposure conditions of concrete structures. For the derivation of the equation, conventional carbonation-prediction equations are analyzed. Through considering the relationship between results of prediction equation and those of various domestic field survey data, the so-called correction factors for different domestic exposure condition of concrete structures are derived. Finally, a carbonation-prediction equation of concrete structures under domestic exposure conditions is proposed with consideration for concrete strength in core and correction factors.
Deformation Behavior Investigation of Materials by Debonding Failure in Adhesion and Repairing-strengthening Methods of RC Construction
Han, Cheon-Goo ; Byun, Hang-Yong ; Park, Yong-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 89~98
This study investigates the deformation behavior, related to debonding failure, of adhesion and repairing-strengthening materials of RC construction. A strain-stress curve shows that when the stress of specimens reached the highest and then fails, the strain value of cement mortar is
, while concrete was indicated at around
, epoxy resins are
, polymer mortar is
, steel plate is
, and carbon bar was
, respectively. For a thermal expansion coefficient with temperature variation, those basis materials, cement mortar and concrete, exhibited around
, but adhesive materials, such as epoxy resins and polymer mortar, were
, respectively. In the case of steel plate is similar to basic materials but carbon fiber is indicates at
, which is the lowest value. Especially, between basic and adhesive materials, the thermal expansion coefficient was highly different. Although the coefficient depends on the type of epoxy resins, it is clear that the epoxy resins are susceptible to be debonded in nature, when the difference of environmental temperature varies more than
A Two-Demensional Nonlinear Analysis of Precast Segmental PSC-I Girder with Dry Joint
Kim, Kwang-Soo ; Kim, Tae-Wan ; Park, Jun-Myung ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 99~106
To satisfy with the increased requirements of cost reduction, labor saving, and rapid construction, the purpose of this study is to investigate the structural behavior of PSC monolithic and spliced girders. Three tests were conducted on small-scale girder specimens. This paper presents the result of experimental studies in terms of the load-deflection behavior. Different joint type and tendon amount were investigated as major variables. The monolithic girder was arranged with three tendons. The spliced girder consisted of five segments connected by three tendons. In addition, five-segmented girders connected by more than three tendons were built to examine the effect of the tendon amount. The experimental results show the difference of behavior between monolithic and spliced girders. Moreover, nonlinear finite element method analysis was utilized to verify the experimental result.
Static Wind Fragility Analysis of an Extradosed Bridge
Kim, Doo Kie ; Kim, Dong Hyawn ; Seo, Hyeong Yeol ; Lee, Chang Ju ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 107~113
This study presents fragility curves for the wind fragility analysis of a six-span extradosed bridge. The loads and corresponding load combinations are calculated using domestic design codes. Random variables are utilized to considering the uncertainties of the input variables for wind loads. The fragility curve is represented as a log-normal distribution function, in which two parameters are estimated by the maximum likelihood method. The results show that the extradosed bridge is safe to suffer static wind forces.
An Evaluation of Slip Coefficient in High Strength Bolt Joint using Zn/Al Metal Spray Corrosion Resistance Method
Kim, Tae-Soo ; Lee, Han-Seung ; Tae, Sung-Ho ; Ahn, Hyun-Jin ; Oh, Sang-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 114~122
In high strength bolted joints, the corrosion of base material causes the reduction of slip resistance of the joints. In this study, tensile tests on slip-critical joints utilizing Zn/Al metal spraying corrosion resistance method were carried out in order to prevent the corrosion and meet the required mechanical characteristics of joints. In addition, slip coefficient and surface roughness were calculated. The key parameters were surface finishing condition and thickness of coating with the identical geometry in all specimens. From the results, it is found that the slip coefficient of the joints with coated finish after sand blast treatment as well as those of non-coated joints with only sand blast treatment were similar or superior to 0.45, which is a specification criteria of slip coefficient in friction-typed joints.
Strengthening Design by External Pre-tensioning and Post-tensioning Methods for Steel-concrete Composite Girders using Rating Factor
Choi, Dong-Ho ; Yoo, Dong-Min ; Jeong, Gu-Sang ; Park, Kyung-Boo ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 123~134
A method to determine the initial force of external tendon is proposed to improve the load carrying capacity in existing steel-concrete composite bridges. This method is applied to tensioning external tendons prior to and after concrete replacement for strengthening composite girders. A procedure to determine the number of tendon and initial tendon force is described with the proposed rating factor, which considers the increment of tendon force due to live loads. The method is applied to the improvement of rating factor in an existing composite bridge and its validity is confirmed.
Flexural Performance of Reinforced Concrete Beams with Recycled Aggregates Suffering from Sustained Load
Ji, Sang-Kyu ; Yun, Hyun-Do ; Kim, Sun-Woo ; Lee, Eon-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 135~143
This paper presents results of an experimental study designed to investigate the effect of sustained load on the flexural performance of reinforced recycled aggregate concrete beams. In this experimental program, three beams with recycled aggregate replacement percentages(natural 100%, recycled coarse aggregate 100%, recycled fine aggregate 50%) were tested up to failure after sustained loading(
) for one year. The experimental results showed that reinforced concrete beams using recycled aggregate(water absorption : 1.86~3.64%) concrete showed the same flexural performance as that of natural aggregate concrete beam. Current the ACI code underestimated experimental obtained ultimate flexural strength of beams irrespective of usage of recycled aggregates.
An Experimental Study to Prevent Debonding Failure of RC Beams Strengthened by AFRP Sheet
Choi, Ki-Sun ; You, Young-Chan ; Kim, Keung-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 144~152
This study investigated the failure mechanism of RC beams strengthened with AFRP sheets. Total 5 half-scale RC beams were constructed and tested to estimate the effectiveness of various methods to prevent the debonding failure of AFRP sheets. From the experimental results, it was found that increasing bonded length or end U-wrappings does not prevent debonding failure. On the other hand, the beams with center U-wrappings and shear-keys reached the ultimate state with their sufficient performance. The center U-wrappings tended to control debonding of the longitudinal AFRP sheets because the growth of the longitudinal cracks along the edges of the composites was delayed. In case of shear-keys, it was sufficient to eliminate debonding and the beams failed by AFRP sheets rupture due to the sufficient bond mechanism.
Fracture Characteristics of RC Beams Reinforced with GFSP
Kim, Chung Ho ; Jang, Hee Suk ; Ko, Sin Woong ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 153~159
This paper is experimental investigation for failure characteristics and performance of a RC beams strengthened with GFSP which were developed for improvement of the early debonding problems in the externally bonded FRP systems. To represent damages and load conditions of the existing beam, pre-cracks and repeating loads are adopted for experimental parameters. In this experiment, it is confirmed that strengthening with GFSP is a very effective strengthening method for an increase in strength, a decrease in deflection, a control of the crack. But it shown that the design of the beams to be strengthened with GFSP should be consider a brittle behavior of the grass fiber on the flexural capacity.
A Case Study on the Reduction Costs Prediction of a Reinforced Concrete Bridge using LCC method
Kwon, Suk-Hyun ; Kim, Sang-Beom ; Park, Yong-Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 160~170
This study predicts Life Cycle Cost of RC Slab bridge case in maintenance and operation level and calculated economic efficiency by the avoidable costs of a bridge. This result of the study can be summarized as follow: (1) LCC analysis model on the bridge case is suggested. (2) Maintenance and operation level of a bridge have been divided, and LCC of the bridge case has been predicted at current maintenance and operation level and required maintenance and operation level. (3) Reduction costs is predicted by LCC of the bridge case, and its economic efficiency is calculated.
A Study on the Properties of Ready Mixed Concrete Quality in Site by Statistical Analysis
Ji, Suk-Won ; Jung, Si-Jin ; Seo, Chee-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 171~180
The quality of ready-mixed concrete(henceforth abbreviated remicon) is influenced by various factors such as ingredient of material, difference of property, mixing ratio, mixing time, mixing error, conditioning of construction, method of curing and temperature, humidity time in transportation. These factors make it hard to confirm the quality of remicon till placing in site. As the quality control in field is very important to ensure the quality of building. Moreover in modern building production, the more important the inquiry of performance improvement, the more important the manufacture and the quality control of remicon. In this study, to examine and analyze the quality of remicon we used slump, air content and compressive strength in 7, 28 days as to remicon which placed during on year. As a result, we found that the slump and air content were satisfied with reference code and the compressive strength was more than the design standard strength so we concluded that the quality control of remicon was to be agreeable.
Experimental Study on Performance Evaluation of Steel Frame with Buckling Control Brace
Lee, Sang-Ju ; Han, Sang-Eul ; Noh, Sam-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 181~188
This research presents two methods to prevent local buckling from circular tube brace and then verify their performance capacity through a cyclic loading test. As control methods on local buckling, one is to restrict local buckling as attaching cover plate at range of buckling. And the another is to exclude danger of buckling as inserting contraction device with rod and spring at the center of brace. The purpose of this research is to develop structural device for restriction of local buckling or for exclusion of its. And we investigate appliance of suggested methods through an experiment. We also estimate the improvement of performance capacity in a quantitative respect.
A Study on The Corrosion Resistance of Concrete Containing Copper Slag
Lee, Dong-Un ; Jung, Yoo-Jin ; Kim, Young-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 189~196
The purpose of this study was to analyze steel corrosion resistance of concrete containing copper slag. The specimens were made with normal portland cement and pozzolan materials with various replacement ratio and with W/B ratio ranging from 35% to 55%. Compressive strength, coefficient of chloride diffusion, corrosion area ratio and weight reduction ratio were determinated for the test. The results show that the concrete with pozzolan materials is superior resistant to chloride ions compared to the concrete without pozzolan materials. It was observed that blast furnace slag replacement ratio of 20% gives the best results with respect to chloride ion penetration and corrosion tests and observed that copper slag replacement ratio of 10% gives the seperior resistance compared to normal concrete.
A Study on Structural Safety Evaluation of Improved PSC Beam Bridges Considering To-Box Reinforcement Effect
Han, Sung Ho ; Shin, Jae Chul ; Bang, Myung Seok ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 5, 2007, Pages 197~211
The deteriorated PSC Beam bridge is necessary improved reinforcement method. In the study, it is proposed the box reinforcing method which could make the stiffness of the PSC Beam bridges increase more stably through the secondary composition effect of open type PSC Beam bridge's girder which is converted into the consolidation box type and the half panel is formed between the lower flange of the PSC Beam about the deteriorated PSC Beam bridge suffering the capacity decline. In case the proposed reinforcement method combine with the existed external prestressed method, the close analysis depending on the time is conducted by the construction stage because of searching the effect of reinforcement quantitatively. The reinforcement method of the box type which is proposed an efficiency improvement in objective in application case, by a reinforcement method after proposing the whole and bend sectional reinforcement method, against a each reinforcement method evaluated the upward camber which it follows in secondary composite effect and a member stress characteristics. Also, the structural safety of PSC Beam bridge is evaluated quantitatively by examining of rating factor through load carrying capacity evaluation.