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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 19, Issue 6 - Nov 2015
Volume 19, Issue 5 - Sep 2015
Volume 19, Issue 4 - Jul 2015
Volume 19, Issue 3 - May 2015
Volume 19, Issue 2 - Mar 2015
Volume 19, Issue 1 - Jan 2015
Selecting the target year
Estimation Formula for Shear Strength of RCS Beam-Column Joint
Chang, Kug-Kwan ; Jeon, Choong-Geun ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 1~9
DOI : 10.11112/jksmi.2015.19.4.001
This study is on the shear strength of the internal joints of RCS composite structure consisting of reinforced concrete column and steel beam. As a newly structure system, the composite system has been developed to fully utilize the advantages of reinforced concrete column and steel beam, which also include economic and practical joint detail. Nevertheless stress transfer mechanism and structural behavior of the joints had not been still clearly revealed and shown much difference from the proposed equation. In this study, by observing the crossing of reinforced concrete column through steel beam to the RCS structure beam type, thirty seven shear failure specimens were selected and applied to the 5 major equations which is used to calculate the shear strength of RCS joint. Through the regression analysis, modified equation which is more reliable and approximate results for shear strength of RCS joints was proposed.
Flexural Test and Structural Analysis to Develope a Lining Board of New-Concept
Kim, Chun-Ho ; Yi, Seong-Tae ; Kim, In-Sic ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 10~17
DOI : 10.11112/jksmi.2015.19.4.010
In this paper, to evaluate and verify safety and performance of new-concept lining board, the experiments and analyses were performed. From the flexural tests, it was noted that the failure occurred at the load of 664kN. At structural analyses based on test results, when the loadings are the unit load 100kN and failure load 664kN, the maximum displacements at the middle part of lining board were 2.58mm and 27.01mm, respectively. In addition, at the elastic range and the plastic range, their load carrying capacities were evaluated as DB-34 and DB-41, respectively. Accordingly, it can be concluded that, since the lining board developed in this study satisfy the design load and structural safety, it supplemented its disadvantages and can apply to construction site.
Reliability Evaluation for Prediction of Concrete Compressive Strength through Impact Resonance Method and Ultra Pulse Velocity Method
Lee, Han-Kyul ; Lee, Byung-Jae ; Oh, Kwang-Chin ; Kim, Yun-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 18~24
DOI : 10.11112/jksmi.2015.19.4.018
Non-destructive testing (NDT) methods are widely used in the construction industry to diagnose the defects/strength of the concrete structure. However, it has been reported that the results obtained from NDT are having low reliability. In order to resolve this issue, four kinds of NDT test (ultrasonic velocity measurements by P-wave and S-wave and the impact resonance methods by longitudinal vibration and deformation vibration) were carried out on 180 concrete cylinders made with two kinds of mix proportions. The reliability of the NDT results was analyzed and compared through the measurement of the actual compressive strength of the concrete cylinders. The statistical analysis of the results was revealed that the ultrasonic velocity method by S-wave is having lowest coefficient of variation and also most capable of stable observation. Analytical equations were established to estimate the compressive strength of the concrete from the obtained NDT results by relating the actual compressive strength. Moreover the equation established by the ultrasonic velocity method by S-wave had the highest coefficient of determination. Further studies on the stability of non-destructive testing depending on various mixing conditions will be necessary in the future.
The Evaluation of Non-Destructive Formulas on Compressive Strength Using the Reliability Based on Probability
Park, Jin-Woo ; Choo, Jin-Ho ; Park, Gwang-Rim ; Hwang, In-Baek ; Shin, Yong-Suk ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 25~34
DOI : 10.11112/jksmi.2015.19.4.025
Proposed equation is used many time in calculation of concrete compressive strength using the non-destructive testing at precision safety diagnosis. Most of proposed equation is suggested in abroad and have an error to estimate concrete compressive strength in the domestic. Therefor, proposed equation is low reliability to estimate concrete compressive and it has a significant effect in reliability of precision safety diagnosis. Nevertheless, It is possible to increase the reliability through a number of experiments from this problem that occurs in some localized part. This paper is proposed assessment formula of reliability related core compressive strength to increase the reliability. It is verified that reliability of proposed assessment formula is useful by probabilistic techniques. It is compared with each graphs of concrete compressive strength of proposed equation. It has been found that the present methods are very efficient.
Analytical Study for Performance Evaluation of Studs for Steel Plate Concrete(SC) Walls subjected to Cyclic Loads
Lim, Jin-Sun ; Jeong, Young-Do ; Yi, Seong-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 35~42
DOI : 10.11112/jksmi.2015.19.4.035
This study analytically reviewed the behavior of Steel Plate Concrete(SC) walls subjected to cyclic loads to investigate the effects of shape and arrangement spacing of studs on the behavior of SC walls. To perform it, 9 cases of finite element analyses considering the different shape and spacing of studs in SC wall were carried out. As the results, the skeleton curves were obtained from the load-displacement history curves and the ultimate and yielding forces were increased as the spacing of studs decrease. In addition, the strength of inclined studs are shown to be bigger compared to that of general studs. The damping ratios are increased as the decrease of strength ratio. Finally, as the decrease of stud spacings, the cumulative dissipated energy was increased and the seismic performance was improved.
A Method to Enhance Dynamic Range for Seismic Sensor Using ARMA Modelling of Low Frequency Noise and Kalman Filtering
Seong, Sang-Man ; Lee, Byeung-Leul ; Won, Jang-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 43~48
DOI : 10.11112/jksmi.2015.19.4.043
In this study, a method to enhance the dynamic range of seismic sensor is proposed. The low frequency noise included in the measurement of seismic sensor is modelled as an ARMA(Auto Regressive Moving Average) model and the order and parameters of the model are identified through system identification method. The identified noise model is augmented into Kalmman filter which estimate seismic signal from sensor measurement. The proposed method is applied to a newly developed seismic sensor which is MEMS based 3-axis accelerometer type. The experiment show that the proposed method can enhance the dynamic range compared to the simple low pass filtering.
Tensile Behavior of Ultra-High Performance Concrete According to Combination of Fibers
Choi, Jung-Il ; Koh, Kyung-Taek ; Lee, Bang-Yeon ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 49~56
DOI : 10.11112/jksmi.2015.19.4.049
Ultra-High Strength Concrete(UHPC) has ultra-high material performance including high strength and high flowability. On the other hand it is less ductile than high ductile fiber reinforced cementitious composite. This study investigated the effect of combination of steel fiber and micro fiber on the tensile behavior of UHPC. Four types of UHPC containing combination of steel fiber, polyethylene(PE), polyvinyl alcohol(PVA), and basalt fiber were designed. And then uniaxial tension tests were performed to evaluate the tensile behavior of UHPC according to combination of fibers. And density was measured to evaluate whether micro fiber induces unintentional high pore or not. From the test results, it was exhibited that PE fiber with high strength is effective to improve the tensile behavior of UHPC and basalt fiber is effective to increase the cracking and tensile strength of UHPC. Furthermore, it was also verified that micro fiber does not make high pore.
Behaviour of Lightweight Concrete Slab Reinforced with GFRP Bars under Concentrated Load
Son, Byung-Lak ; Kim, Chung-Ho ; Jang, Heui-Suk ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 57~66
DOI : 10.11112/jksmi.2015.19.4.057
This paper is a preliminary study to apply the lightweight concrete slabs reinforced with GFRP (glass fiber reinforced polymer) bars to the bridge deck slabs or some other concrete structures. So, some different behaviors between the conventional steel reinforced concrete slab and the lightweight concrete slab reinforced with GFRP bars were investigated. For this purpose, a number of slabs were constructed and then the three point bending test and numerical analysis for these slabs were performed. The flexural test results showed that the lightweight concrete slabs reinforced with GFRP bars were failed by the shear failure due to the over-reinforced design. The weight and failure load of the GFRP bar reinforced lightweight concrete slabs were 72% and 58% of the steel reinforced concrete slab with the same dimensions, respectively. Results of the numerical analysis for these slabs using a commercial program, midas FEA, showed that the load-deflection curve could be simulated well until the shear failure of the slabs, but the applied loads and the deflections continuously increased even beyond the shear failure loads.
Effects of Micropores on the Freezing-Thawing Resistance of High Volume Slag Concrete
Kim, Rae-Hwan ; Kim, Gyu-Yong ; Lee, Bo-Kyeong ; Shin, Kyoung-Su ; Song, Gwon-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 67~74
DOI : 10.11112/jksmi.2015.19.4.067
In this study, effects of micropores on the freezing-thawing resistance of high volume slag concrete are reviewed. Concrete was made with slag which contains the ground granulated blast furnace slag(GGBS) and the pig iron preliminary treatment slag(PS) by replacing 0, 40, 70 %, then compressive strength, freezing-thawing resistance, micropores were reviewed. Also, specified design strength, target air contents were set. Deterioration was induced by using 14-day-age specimen which has low compressive strength for evaluating deterioration by freeze-thawing action. As results of the experiment, despite of specified design strength which has been set similarly and ensured target air contents, the pore size distribution of the concrete showed different results. Micropores in GGBS70 specimen have small amount of water which is likely to freeze because there is small amount of pore volume of 10~100 nm size at 0 cycle which has not been influenced by freezing-thawing. For these reasons, it was confirmed that the freezing-thawing resistance performance of GGBS70 is significantly superior than other specimens because relatively small expansion pressure is generated compared to the other specimens.
Cyclic Responses of Steel Reinforced ECC Column under Reversed Cyclic Loading Conditions
Hyun, Jung-Hwan ; Shim, Young-Heung ; Bang, Jin-Wook ; Kim, Yun-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 75~82
DOI : 10.11112/jksmi.2015.19.4.075
In this study, experimental research was carried out to evaluate steel reinforced ECC (Engineered Cementitious Composites) column, which exhibits excellent crack control property and highly ductile behavior. Ordinary portland cement and high volume fly ash were used as binding materials in the mixture proportions for the purpose of achieving a high level of multiple cracking property with the tightly controlled crack width. To compare with the cyclic behavior of steel reinforced ECC column specimen, a conventional reinforced concrete column was prepared and tested under reversed cyclic loading condition. Based on the cyclic load test, ECC column exhibited higher cyclic behavior, compared to the conventional RC column, in terms of load carrying capacity and energy dissipation capacity.
Evaluation of Material Properties Variations of Cementitious Composites under High Strain Rate by SHPB Test and Image Analysis
Cho, Hyun-Woo ; Lee, Jang-Hwa ; Min, Ji-Young ; Park, Jung-Jun ; Moon, Jae-Heum ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 83~91
DOI : 10.11112/jksmi.2015.19.4.083
Under impact or blast loads, concrete behaves with different mechanical properties comparing to the static loading conditions. In other words, with high strain rate, mechanical properties of concrete vary significantly. To evaluate the compressive characteristics of concrete with high strain rate, SHPB(Split Hopkinson Pressure Bar) test is typically used. However, because SHPB test method has been developed for metallic materials, it is necessary to verify the applicability of SHPB for brittle materials such as concrete. Also, there have been little researches on the evaluations of mechanical characteristics of UHPC under high strain rate conditions. This study has been performed to evaluate and analyse the compressive characteristics of plain concrete and UHPC with SHPB test apparatus. Also, to verify the applicability of SHPB test for concrete, direct displacement image analysis with high speed camera was performed for the comparisons with analytical solutions for SHPB test.
Fracture Characteristics of Ductile Fiber Reinforced Cement based Composites by Collision of Steel Projectile
Nam, Jeong-Soo ; Kim, Gyu-Yong ; Kim, Hong-Seop ; Kim, Jung-Hyun ; Han, Sang-Hyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 92~100
DOI : 10.11112/jksmi.2015.19.4.092
The aim of this study is to evaluate the fracture characteristics of ductile fiber reinforced cement based composites with 1.5 volume ratio of polyvinyl alcohol and steel fiber by high velocity impact of steel projectile. We used gunpowder impact facility to evaluate the fracture characteristics of ductile fiber reinforced cement based composites by collision of steel projectile, and the impact velocity was from about 150 to 1,000m/s. The results of evaluation on the fracture characteristics of ductile fiber reinforced cement based composites were penetration grade, which is the kinetic energy more than three times of no-fiber reinforced specimen (Plain). In addition, ductile fiber reinforced cement based composites did not occurred critical damage other than the debris. In the case of mass loss, Plain specimen was proportional to kinetic energy of steel projectile, while ductile fiber reinforced cement based composites was not significantly affected by kinetic energy of steel projectile. In particular, this tendency had a close relationship with the fracture characteristics of back side of specimens, and the scabbing inhibiting efficiency of PVA specimen was higher than S specimen. In the results of verifying relationship between front and back side calculated by local damage, scabbing occurred at the region close to the back side in the ductile fiber reinforced cement based composites unlike Plain specimen. Thus, in this study, we examined principal fracture behaviors of ductile fiber reinforced cement based composites under collision of steel projectile, and verified that impact resistance performance was improved as compared to Plain specimen.
Evaluation on the Applicability of Heavy Weight Waste Glass as Fine Aggregate of Shielding Concrete
Choi, So-Yeong ; Choi, Yoon-Suk ; Won, Min-Sik ; Yang, Eun-Ik ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 101~108
DOI : 10.11112/jksmi.2015.19.4.101
The quantities of heavy weight waste glass have been progressively increased because of the rapid industrialization and the change of quality of life. And, the most of them are not recycled. The heavy weight waste glass have been treated by illegal dumping or being buried in landfills. Meanwhile, in order to ensure the safety of nuclear power plant structure, the excellent construction materials are socially required for shielding performance. Concrete is the most widely used construction material, the huge amounts of natural resources are required to make concrete. So, it is needed to investigate the possibility of recycling of heavy weight waste glass as concrete material ingredient. In this study, the heavy weight waste glass was evaluated for the applicability as fine aggregate of shielding concrete. From the results, when heavy weight waste glass was replaced as fine aggregate of mortar, shielding performance can be improved due to increasing in unit weight of mortar. It showed that the strength decreased according to mixing of heavy weight waste glass, Non-Washed heavy weight waste glass is more advantageous in the strength development than Washed case.
Flexural Performance Characteristics of High Performance Slurry Infiltrated Fiber Reinforced Cementitious Composite according to Fiber Volume Fraction
Kim, Seung-Won ; Cho, Hyun-Myung ; Lee, Hak-Yong ; Park, Cheol-Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 109~115
DOI : 10.11112/jksmi.2015.19.4.109
High performance fiber reinforced cementitious composite (HPFRCC) can provide high fracture energy absorption as well as high strength with high fiber volume fraction. The increased fracture energy helps resisting high frequency loadings, such as earthquake, impact or blast. This study investigates the flexural performance of slurry infiltrated fiber concrete (SIFCON), one of the important HPFRCC, with respect to varying fiber volume fraction. The maximum fiber volume fraction was 8.0 % and reduced to 6.0% by 0.5% and the maximum volume fraction is obtained by packing fibers with simple tapping by hands. The used fiber was a steel fiber with the length 30 mm and the diameter of 0.5 mm. The flexural strengths were 48.7 MPa at 8.0 % and 22.8 MPa at 6.0 %. The measured flexural strength is much higher compared to other cememtitious composite materials but decreased proportional to the fractions. This result implies that for SIFCON considered herein the reduced amount of steel fibers may affect its flexural performance in a negatively way. The flexural toughness, an index to represent the fracture energy absorption, also decreased with the reduced fiber amount.
The Effect of the Replacement of Grinded Fly Ash according to Curing Temperature on Repair Mortar Based on Polymer Admixture
Sim, Jae-Il ; Mun, Ju-Hyun ; Yun, In-Gu ; Jeon, Young-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 116~124
DOI : 10.11112/jksmi.2015.19.4.116
The objective of this study is to evaluate the effects of the replacement levels of grinded fly-ash on the repaired mortar based on a polymer. The main parameters are the curing temperature and replacement levels of grinded fly-ash. The curing temperature and the replacement levels of grinded fly-ash are varied at
, and between 0% and 35% of the total binder by weight, respectively. The flow in fresh mortar and compressive strengths according to ages, the relationship of stress-strain, elastic modulus and modulus rupture in hardened mortar, as well as scanning the electron microscopy and the X-ray diffraction of mortar, were measured, respectively. The test results showed that the flow, elastic modulus and modulus rupture are great in mortar specimens with 20~30% of the replacement levels of grinded fly-ash. In addition, compressive strengths according to ages were affected by the replacement levels of grinded fly-ash and the curing temperature indicated that the strength development ratio of mortar with 20% of the replacement levels of grinded fly-ash was greater than others. In the prediction of the compressive strength specified by the ACI 209 code, the strength development at an early and late age can be generalized by the functions of the replacement levels of grinded fly-ash and the curing temperature. In the analysis of scanning the electron microscopy and the X-ray diffraction, the number and intensity of peaks increased and the form of CSH gels on the surface of the particle of grinded fly-ash was observed.
Dynamic Response of PSC I shape girder being used wide upper flange in Railway Bridge
Park, Jong-Kwon ; Jang, Pan-Ki ; Cha, Tae-Gweon ; Kim, Chan-Woo ; Jang, Il-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 125~135
DOI : 10.11112/jksmi.2015.19.4.125
The tendency of more longer span length being required economical in railway bridges is studying about PSC I shaped girder. In this case, it is important to analyze and choose the effective girder section for stiffness of bridge. This study investigates the dynamic properties and safety of PSC I shaped girder being used wide upper flange whose selection based on radii and efficiency factor of flexure for railway bridge in different span type. In addition, 40m PSC Box girder bridge adopted in Honam high speed railway is further analyzed to compare dynamic performance of PSC I shaped girder railway bridge with same span length. Time history response is acquired based on the mode superposition method. Static analysis is also analyzed using standard train load combined with the impact factor. Consequently, the result met limit values in every case including vertical displacement, acceleration and distort.
Characteristics of Bond Strength in Concrete Beams Reinforced with Galvanized Rebar
Shin, Jae-Hyuk ; Kim, Kyoung-Chul ; Yang, In-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 4, 2015, Pages 136~143
DOI : 10.11112/jksmi.2015.19.4.136
Galvanizing is one of the method used to solve the problem of corrosion of reinforcement in concrete structures. There few research reported in the literature regarding the effect of galvanized coating on the behavior of lap splices in concrete beams. The objective of this study was to determine whether galvanized rebar adversely affects lap splice behavior and bond strength. Concrete beams reinforced with black or galvanized rebar were tested in flexure. The test variables included the presence of galvanized rebar steel diameter, and lengths of lap splices. The study concentrated on comparing crack, failure pattern, and bond strength. The ultimate behavior of beams reinforced with galvanized rebar was not significantly different from that of black steel reinforced beams. Therefore, the test results indicated that the use of galvanizing-coated rebar had no adverse effect on behavior in lap splices of rebar compared to the use of black rebar.