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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 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
Seismic Performance of Octagonal Flared RC Columns using Oblong Hoops
Ko, Seong-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 1~9
DOI : 10.11112/jksmi.2015.19.6.001
Transverse steel bars are used in the plastic hinge zone of columns to insure adequate confinement, prevention of longitudinal bar buckling and ductile behavior. Fabrication and placement of rectangular hoops and cross-ties in columns are difficult to construct. Details of reinforcement for rectangular section require a lot of rectangular hoops and cross-ties. In this paper, to solve these problems, the new lateral confinement method using oblong hoop is proposed for the transverse confinement of the flared column. It can be the alternative for oblong cross-section and flared column with improved workability and cost-efficiency. The final objectives of this study are to suggest appropriate oblong hoop details and to provide quantitative reference data and tendency for seismic performance or damage assessment based on the drift levels such as residual deformation, elastic strain energy. This paper describes factors of seismic performance such as ultimate displacement/drift ratio, displacement ductility, response modification factor, equivalent viscous damping ratio and effective stiffness.
Seismic Capacity of Non-seismic Designed RC Framed Building Retrofitted by Double I-type Metallic Damper
Hur, Moo-Won ; Chun, Young-Soo ; Hwang, Jae-Seung ; Kim, Jong-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 10~17
DOI : 10.11112/jksmi.2015.19.6.010
In this study, to examine seismic reinforcement effect of a school building constructed prior to application of seismic design, a Double I-type damper supported by wall was installed to perform comparative analysis on existing non-seismic designed RC frame. As a result of experiment, while non-seismic designed specimen showed rapid reduction in strength and brittle shear destruction as damages were focused on top and bottom of left and right columns, reinforced specimen showed hysteretic characteristics of a large ellipse with great energy absorption ability, exhibiting perfectly behavior with increased strength and stiffness from damper reinforcement. In addition, as a result of comparing stiffness reduction between the two specimens, specimen reinforced by shear wall type damper was effective in preventing stiffness reduction. Energy dissipation ability of specimen reinforced by Double I-type damper was about 3.5 times as high as energy dissipation ability of non-reinforced specimen. Such enhancement in energy dissipation ability is considered to be the result of improved strength and deformation.
Analysis on the Shear Behavior of Existing Reinforced Concrete Beam-Column Structures Infilled with U-Type Precast Wall Panel
Ha, Soo-Kyoung ; Son, Guk-Won ; Yu, Sung-Yong ; Ju, Ho-Seong ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 18~28
DOI : 10.11112/jksmi.2015.19.6.018
The purpose of this study is to develop a new seismic resistant method by using precast concrete wall panels for existing low-rise, reinforced concrete beam-column buildings such as school buildings. Three quasi-static hysteresis loading tests were performed on one unreinforced beam-column specimen and two reinforced specimens with U-type precast wall panels. The results were analyzed to find that the specimen with anchored connection experienced shear failure, while the other specimen with steel plate connection principally manifested flexural failure. The ultimate strength of the specimens was determined to be the weaker of the shear strength of top connection and flexural strength at the critical section of precast panel. In this setup of U-type panel specimens, if a push loading is applied to the reinforced concrete column on one side and push the precast concrete panel, a pull loading from upper shear connection is to be applied to the other side of the top shear connection of precast panel. Since the composite flexural behavior of the two members govern the total behavior during the push loading process, the ultimate horizontal resistance of this specimen was not directly influenced by shear strength at the top connection of precast panel. However, the RC column and PC wall panel member mainly exhibited non-composite behavior during the pull loading process. The ultimate horizontal resistance was directly influenced by the shear strength of top connection because the pull loading from the beam applied directly to the upper shear connection. The analytical result for the internal shear resistance at the connection pursuant to the anchor shear design of ACI 318M-11 Appendix-D, agreed with the experimental result based on the elastic analysis of Midas-Zen by using the largest loading from experiment.
Durability and Bioassay of a Sulfur Polymer Surface Protecting Agent for Concrete Structures
Seok, Byoung-Yoon ; Lee, Byung-Jae ; Kim, Yun-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 29~36
DOI : 10.11112/jksmi.2015.19.6.029
In this study, to examine the use of sulfur polymer as a coating agent for concrete, durability and hazard evaluations were performed. The result of the evaluation indicated that the chemical resistance of the coating agent for concrete was outstanding against acidic, base, and alkaline solutions. The evaluation of the bond strength after an accelerated weathering test depending on the mixing condition indicated that the most outstanding strength characteristic was obtained when silica powder and fly ash were mixed at the same time. The bond strength exceeded 1 MPa in every mixing condition even after the repeated hot and cold treatment of the coating agent specimen for concrete, and the SFS mix proportion showed the highest bond strength. The examination of the accelerated carbonation and chloride ion penetration resistance of the concrete coated with the coating agent indicated that the specimen coated with the coating agent using silica powder as a filler showed the most outstanding durability. When a fish toxicity test was performed to examine the hazard of the use of the functional polymer as a coating agent for concrete, the functional polymer was found to have no effect on the organisms. When the chemical resistance, freezing and thawing resistance, carbonation, and chloride ion penetration resistance of the coating agent were considered, substituting silica powder and fly ash as the fillers of the functional polymer by 20%, respectively, was the optimal level in the range of this study.
Effect of Milled Glass Fibers on Corrosion Resistance of PSC Grout Mortar
Moon, Do-Young ; Kim, Sang-Woon ; Kim, Dong-Joo ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 37~45
DOI : 10.11112/jksmi.2015.19.6.037
In this experimental study, effect of milled glass fibers was investigated on corrosion resistance of PSC grout mortar. In order to check whether the mortar mixture with milled glass fibers satisfy the required properties as a PSC grout, time of flow, bleeding and compressive strength measured. The corrosion resistance were investigated through chloride ion migration test, mortar absorption test and surface resistivity measurement. It is confirmed that all proportions with milled glass fibers have better corrosion resistance than that with only OPC binder. Time of flow was reduced but the bleeding was increased to unacceptable level by using milled glass fibers. Consequently, the mix proportion with milled glass fibers for a PSC grout should be modified to have lower water/binder ratio.
Parameter Study for the Application of Ultra Thin Polymer Concrete Pavement
Yoon, Sang il ; Jang, Yong joon ; Choi, Jinwoong ; Hong, Sungnam ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 46~54
DOI : 10.11112/jksmi.2015.19.6.046
Base on Korean design code, previous design code had not considered the effect of pavement on the orthotropic steel deck, however recent design code (Limit State Design Method, 2012) allowed to consider the effect of pavement on the orthotropic steel deck, and efforts to apply the stiffness of pavement to the deck continue. Meanwhile, research on the effect of ultra thin bridge deck overlay on the orthotropic steel deck is inadequate, previous study was limited in about fatigue stress and performance between pavement layer and the orthotropic steel deck. In this study, according to changing of pavement layer stiffness application, pavement materials, pavement thickness and steel deck thickness, analysis of deflection. In addition to base on this result, consider effectiveness of ultra-thin pavement stiffness application on the orthotropic steel deck.
Evaluation of Fracture Behaviours of Cementitious Composites by High-velocity Projectile Impact
Min, Ji-Young ; Cho, Hyun-Woo ; Lee, Jang-Hwa ; Kim, Sung-Wook ; Moon, Jae-Heum ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 55~62
DOI : 10.11112/jksmi.2015.19.6.055
An importance of infrastructures' protection against crash or blast loading has been an emerging issue as structures are becoming much bigger and population densities in downtown are growing up. However, there exists no such a standard to evaluate the protection performance of construction material itself. Prior to building standards for protection assessment techniques, this study performed gas-gun propelled projectile impact tests with series of contact-type monitoring systems to investigate the applicability of each sensing type. Through the impact tests, failure modes and protection performances of both normal concrete and UHPC (Ultra High Performance Concrete) reinforced by steel fibers were also evaluated. The results showed that LVDT could be applicable for the impact test among contact-type sensors and UHPC with fibers had a remarkable potential to improve protection against impact loading.
Performance Evaluation of High Strength Concrete with Composite Fibers in Accordance with High Temperature
Kim, Seung-Ki ; Kim, Woo-Suk ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 63~71
DOI : 10.11112/jksmi.2015.19.6.063
The objective of the present study is to investigate how elevated temperature ranging from
as well as room temperature affects the variation of mechanical properties of high strength concrete (
). In this experiment, specimens were exposed for a period of
to temperatures of
, respectively. Accordingly, the study investigated the fire resistance performance of high strength concrete mixed with composite fibers which composed with hybrid fibers and steel fibers. After cooling down to ambient temperature, the following basic mechanical properties were then evaluated and compared with reference values obtained prior to thermal exposure: (i) compressive strength in room temperature; (ii) residual compressive strength; (iii) Poisson's ratio; (iv) weight change; (v) SEM analysis & XRD analysis In addition, XRD and SEM Images analyses were performed to investigate chemical and physical characteristics of high strength concrete with composite fibers according to high temperature.
Probabilistic Risk Assessment of Coastal Structures using LHS-based Reliability Analysis Method
Huh, Jung-Won ; Jung, Hong-Woo ; Ahn, Jin-Hee ; An, Sung-Wook ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 72~79
DOI : 10.11112/jksmi.2015.19.6.072
An efficient and practical reliability evaluation method is proposed for the coastal structures in this paper. It is capable of evaluating reliability of real complicated coastal structures considering uncertainties in various sources of design parameters, such as wave and current loads, resistance-related design variables including Young's modulus and compressive strength of the reinforced concrete, soil parameters, and boundary conditions. It is developed by intelligently integrating the Latin Hypercube sampling (LHS), Monte Carlo simulation (MCS) and the finite element method (FEM). The LHS-based MCS is used to significantly reduce the computational effort by limiting the number of simulation cycles required for the reliability evaluation. The applicability and efficiency of the proposed method were verified using a caisson-type breakwater structure in the numerical example.
Evaluation on the Performance of Mortars Made with Calcium Aluminate Cement
Lee, Seung-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 80~87
DOI : 10.11112/jksmi.2015.19.6.080
In this study, several properties of mortars made with calcium aluminate cement (CAC) such as hydrated products, strength characteristics, absorption, surface electric resistivity and chloride ions penetration resistance were experimentally investigated. The properties of CAC mortars were compared to those of ordinary portland cement (OPC) mortars. From the test results, it was found that the main hydrated products for CAC mortars were of
, while CH, ettringite and calcite for OPC mortars. The surface electric resistivity and chloride ions penetration resistance of CAC mortars were significantly beneficial compared to those of OPC mortars. However, it should be noted that the absorption properties of CAC mortars were negatively examined. Thus, it needs to have more study for the improvement of surface absorption of CAC matrices. In addition, the combined mixture of CAC and OPC were ineffective to improve some performances of mortars.
Petrochemical Plant Safety Management System based on Wireless Transmitter
Kang, Sung-Min ; Park, Soo-Yeol ; Yeo, Keum-Soo ; Park, Jae-Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 88~94
DOI : 10.11112/jksmi.2015.19.6.088
Large-scale petrochemical and power plants has increased demanting wireless technology for continuous monitoring. However, the current USN technologies, such as ZigBee and Bluetooth, are lackof reliability and security. Therefore, there is a strong need to apply a new wireless technology standard of the ISA. In this study, a petrochemicalplant safety management system based on the ISA wireless transmitter isdeveloped. ISA100.11a communication module and LTE communication module equippedwith an explosion-proof wireless transmitter are developed. A petrochemicalplant safety management system is built based on the IoT technologies. Thedeveloped system is verified through a wide range of testing and thus, on-siteapplicability is proved.
Evaluation of Structural Behavior and Moment of Inertia on Modular Slabs Subjected to Cyclic Loading
Park, Jongho ; Choi, Jinwoong ; Lee, Hong-Myung ; Park, Sun-Kyu ; Hong, Sungnam ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 95~102
DOI : 10.11112/jksmi.2015.19.6.095
Recently, the maintenance activity for aging of bridge structures was difficult because of traffic jam, environment pollution and increasing cost. And to solve these problems, modular bridge research has been studied. After static and cyclic loading test was conducted for serviceability and bending performance with one way slab, effective moment of inertia of modular specimen was analyzed to estimate the deflection by KCI(2012). To conduct the test, one integral slab and three modular slabs were made for static loading and one integral and modular slab were made for cyclic. As a result of the test, the modular slab had the similar bending performance of the integral. But the ultimate deflection showed the insufficient which was smaller than 20%. In the cyclic loading test, the modular slab has different behavior of deflection with the integral, so it was evaluated difficult for serviceability. In addition, effective moment of inertia by KCI(2012) was not estimated for modular slab with connection. The new value of m which was ratio between moments is 4.53 based on result of test for predicting deflection of modular.
An Empirical Approach for Improving the Estimation of the Concrete Compressive Strength Considered the Effect of Age and Drilled Core Sample
Oh, Hongseob ; Oh, Kwang-Chin ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 103~111
DOI : 10.11112/jksmi.2015.19.6.103
To evaluate the compressive strength of concrete, rebound test and ultra pulse velocity methods as well as core test were widely used. The predicted strength effected by age, maturity and degradation of concrete, is a slight difference between in-situ concrete strength. The compressive strength of standard cylinder specimens and core samples by obtained from drilling will have a difference since the concrete is disturbed during the drilling by machinery. And the rebound number and ultra pulse velocity are also changed according to the age and maturity of concrete that effected to the surface hardness and microscpic minuteness. The authors performed the experimental work to reflect the age and core effect to the results from NDE test. The test results considering on the core and age of concrete were compaired with the proposed equation to predict the compressive strength.
Structural Performance of Y Type Plate Connection between Circular CFT Column and H Shape Steel Beam
Jo, Hyun-Kook ; Choi, Chang-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 112~118
DOI : 10.11112/jksmi.2015.19.6.112
These days, there are lots of skyscrapers being constructed in downtown areas. However, it requires columns which have a way heavier load. and far more extensive cross sections of column as well. Therefore, it is hard to lay the foundation in downtown areas. This being the case, composite columns such as CFT column are primarily being used. However, CFT column is occurred of difficult beam-column connection development and lower performance since CFT column is closed cross-section. Especially, the result of the study concerning development of connection details with CFT column and exterior diaphragms are very low in current state. In this study, through developing CFT column-H shape steel beam applicating Y shape plate, set width and depth of Y shape plate which affect structural performance of connection details applicating Y shape plate as main variables, and evaluate structural performance through experiments. And also, design Y shape plate used at experiments as setting allowable stress for tension suggested at design criteria lower than axial force of tension side flange connected Y shape plate, through shape of destruction, verify the structural safety and performance of Y shape plate.
The Elementary Study on the Development for Test Methods of Load Resistance about Attachments on the Lightweight Wall
Kim, Sang-Heon ; Kim, Se-Whan ; Choi, Soo-Kyung ; Seo, Chee-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 6, 2015, Pages 119~126
DOI : 10.11112/jksmi.2015.19.6.119
The wall system has been also tending to shift from existing concrete wall to variable lightweight wall according to increasing use of column structure system in apartment construction. Therefore, wall needs certain amount of strength which also means the standard measurement of resistance against loading of wall attachments is needed. Nevertheless, there currently aren't enough researches of related standards for such measurement. For such reason, the research would be used as baseline data to development for test methods of load resistance about attachments on the lightweight wall, that presented improvements in the apparatus and maximum loads for domestic circumstances by researching current tests.