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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 17, Issue 6 - Nov 2013
Volume 17, Issue 5 - Sep 2013
Volume 17, Issue 4 - Jul 2013
Volume 17, Issue 3 - May 2013
Volume 17, Issue 2 - Mar 2013
Volume 17, Issue 1 - Jan 2013
Selecting the target year
Study on Seismic Performance of RC Column with Super-Flexibility Membrane
Lee, Weon-Cheol ; Yhim, Sung-Soon ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 1~12
DOI : 10.11112/jksmi.2013.17.5.001
This study presents the evaluations of seismic performance and displacement ductility for two types of RC columns: existing RC column without SFM (Super Flexibility Membrane) and CSF (RC columns strengthened with SFM). After they are analyzed by the experiment as well as FEM, crack patterns and load-displacement curve of CSF by the former are shown to similar to those of CSF by the latter. The flexural cracks are dominant in CSF, whereas shear cracks in CNF (existing RC column without SFM). Displacement ductility of CSF is shown significantly to increase as well as ultimate displacement, compared to those of CNF. Therefore CSF can be replaced to CNF in order to increase the seismic performance and displacement ductility.
Study of Integrated Optimal Design of Smart Top-Story Isolation and Building Structures in Regions of Low-to-Moderate Seismicity
Kim, Hyun-Su ; Kang, Joo-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 13~20
DOI : 10.11112/jksmi.2013.17.5.013
In order to reduce seismic responses of a structure, additional dampers and vibration control devices are generally considered. Usually, control performance of additional devices are investigated for optimal design without variation of characteristics of a structure. In this study, multi-objective integrated optimization of structure-smart control device is conducted and possibility of reduction of structural resources of a building structure with smart top-story isolation system has been investigated. To this end, 20-story example building structure was selected and an MR damper and low damping elastomeric bearings were used to compose a smart base isolation system. Artificial earthquakes generated based on design spectrum of low-to-moderate seismicity regions are used for structural analyses. Based on numerical simulation results, it has been shown that a smart top-story isolation system can effectively reduce both structural responses and isolation story drifts of the building structure in low-to-moderate seismicity regions. The integrated optimal design method proposed in this study can provide various optimal designs that presents good control performance by appropriately reducing the amount of structural material and damping device.
The Structural Reinforcing of PCC-Deck with Cantilever
Lho, Byeong-Cheol ; Kim, Chang-Kyo ; Park, Jong-Hyeon ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 21~30
DOI : 10.11112/jksmi.2013.17.5.021
LB-Deck is one of the widely used member in interior part of girders as a permanent formwork in structures, but it is not easy to apply to the exterior part of girder due to the overturning and excessive deflection. Considering allowable deflection and safety of the exterior part, Precast Concrete Cantilever Deck (PCC-Deck) is proposed with normal LB-Deck in inner part and extended bars of LB-Deck in outer part. Both numerical analyses and experimental tests were compared to check the safety and allowable deflection for 6 types of PCC-Deck, and D-type (with 16 mm top bar, 6 mm lattice bar, 12 mm bottom bar) is suggested as an optimal structural reinforcement to the 28 kN of maximum load and 27.49 mm of final deflection. The load resisting ratio of D-type under working load of 10 kN was about 2.8 times and 77.5% of improvement was observed.
An Performance Evaluation of the Post-installed Anchor System According to the Freezing and Thawing of Concrete and the Corrosion of Anchor
Kwon, Min-Ho ; Kim, Jin-Sup ; Jung, Woo-Young ; Kwon, Sang-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 31~39
DOI : 10.11112/jksmi.2013.17.5.031
In this study, performance of the post-installed anchor system was evaluated with reduced strength of concrete and anchor. One of the post-installed anchors was selected to performance evaluation. Concrete strength was reduced by freeze-thawing test, and the post-installed anchor strength was reduced by corrosion test. The post-installed Anchor was installed in concrete of freezing and thawing and original concrete, and corroded anchor was installed in original concrete only. Anchor diameter and installation depth of the anchor were the variable for each specimen. Performance of post-installed anchor system of each specimen was evaluated by pullout test. Anchor diameter and installation depth of anchor, it may affect the performance of the post-installed anchor system from the experimental test results. Fracture mode of each post-installed anchor system had occurred differently depending on the durability of concrete and anchor. The anchor pullout strength from the experimental test results was used in order to compare with the results of CCD (Concrete Capacity Design) method, and CCD equation was modified. Modified equation was able to predict the anchor pullout strength of post-installed anchor system in Original concrete and freezing and thawing of concrete.
An Experimental Study for the Evaluation of the Structural Behavior Eco Deck Plate
Lee, Jin-Eung ; Lee, Yong-Jae ; Lee, Soo-Kueon ; Jung, Byung-Joo ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 40~48
DOI : 10.11112/jksmi.2013.17.5.040
Eco deck plate system is a construction method that deconstruction of galvanized steel sheets is possible by integrating steel-wire-integrated girders and the galvanized steel sheets with bolts. Therefore, compared with previous steel-wire-integrated deck plates which were joined by welding, the system is acknowledged as the construction method possible management and repair. This study conducted an experimental research by manufacturing total 24 full size specimens in a same condition for 12-shape specimens by two parts to evaluate structural behaviors of the eco deck plates. In the results after the test, permissible deflection for the construction load action was shown to be values under design values and satisfactory. The processing of lattice steel wires was presented to be structurally advantageous in being manufactured by cutting downward. Also, in case of a specimen that D13 as a steel wire was used, destruction occurred at the welding part of the bottom steel wire and the lattice steel wire, so improvement measures for the welding in factory manufacture are necessary.
Seismic Performance and Flexural Over-strength of Circular RC Column
Ko, Seong-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 49~58
DOI : 10.11112/jksmi.2013.17.5.049
Eight small scale circular reinforced concrete columns were tested under cyclic lateral load with constant axial load. Test specimens were designed with 4.5 aspect ratio. The selected test variables are longitudinal steel ratio, transverse steel ratio, yielding strength of longitudinal steel and axial load ratio. The test results of columns with different longitudinal steel ratio, transverse steel ratio and axial load ratio showed different seismic performance such as equivalent damping ratio, residual displacement and effective stiffness. It was found that the column with low strength of longitudinal steel showed significantly reduced seismic performance, especially for equivalent damping ratio and residual displacement. The regulation of flexural over-strength is adopted by Korea Bridge Design Specifications (Limited state design, 2012). The test results are compared with nominal strength, result of nonlinear moment-curvature analysis and the design specifications such as AASHTO LRFD and Korea Bridge Design Specifications (Limited state design).
Development Ultra Rapid Hardening Construction Materials on Cold Weather Environment Considering Curing Temperature
Cho, Hyun-Woo ; Shin, Hyun-Seop ; Lee, Jang-Hwa ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 59~66
DOI : 10.11112/jksmi.2013.17.5.059
Because ordinary concrete cannot be hardened well under sub-zero temperatures, anti-freeze agents are typically added to prevent the frost damage and to ensure the proper hardening of concrete. With the advantage of a rapid exothermic reaction property, jet set concrete may be used as a cold weather concrete because it can reach the required strength before being damaged by cold weather. Recent studies are reported that magnesia-phosphate composites can be hardened very quickly and hydrated even in low temperature, which can be used as an alternative of severe cold weather concrete in arctic regions. This study developed the magnesia-phosphate composites that can be used in severe cold regions and suggested an appropriate mixture design from the experimental results.
The Inhibitive Effect of Electrochemical Treatment Applied to Fresh/hardened Concrete
Kim, Sung-Wook ; Moon, Jae-Heum ; Ann, Ki-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 67~76
DOI : 10.11112/jksmi.2013.17.5.067
In this study, the inhibitive effect of electrochemical treatment subjected to fresh and hardened concrete and literature reviews in terms of the treatment were performed. In hardened concrete, chloride ions are mixed during casting to destroy the passivity of steel, and then the current was provided for 2 weeks with 250, 500 and
. After completion of electrochemical treatment, the extraction of chloride ions was quantified and repassivation of steel was observed. Simultaneously, the equated levels of current density for 2 weeks were applied to fresh concrete. Steel-concrete interface in concrete was observed by BSE image analysis and the concrete properties in terms of the diffusivity of chloride ions and the resistance of steel corrosion was measured. As the result, electrochemical treatment is very effectiveness to rehabilitate the passive film on the steel surface and 63-73% of chloride ions in concrete were extracted by the treatment. As the treatment was applied to fresh concrete, the resistance of steel corrosion was improved due to the densification of
layers in the vicinity of steel. However, an increase in the current density resulted in an increase in surface chloride content of concrete.
The Fundamental Properties of Alkali-Activated Slag Cement (AASC) Mortar with Different Water-Binder Ratios and Fine Aggregate-Binder Ratios
Kim, Tae-Wan ; Hahm, Hyung-Gil ; Lee, Seong-Haeng ; Eom, Jang-Sub ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 77~86
DOI : 10.11112/jksmi.2013.17.5.077
This study investigates the fundamental properties of the water-binder (W/B) ratio and fine aggregate-binder (F/B) ratio in the alkali-activated slag cement (AASC) mortar. The W/B ratios are 0.35, 0.40, 0.45, and 0.50, respectively. And then the F/B ratios varied between 1.00 and 3.00 at a constant increment of 0.25. The alkali activator was an 2M and 4M NaOH. The measured mechanical properties were compared, flow, compressive strength, absorption, ultra sonic velocity, and dry shrinkage. The flow, compressive strength, absorption, ultra sonic velocity and dry shrinkage decreased with increases W/B ratio. The compressive strength decreases with increase F/B ratio at same W/B ratio. Also, at certain value of F/B ratio significant increase in strength is observed. And S2 (river sand 2) had lower physical properties than S1 (river sand 1) due to the fineness modulus. The results of experiments indicated that the mechanical properties of AASC depended on the W/B ratio and F/B ratio. The optimum range for W/B ratios and F/B ratios of AASC is suggested that the F/B ratios by 1.75~2.50 at each W/B ratios. Moreover, the W/(B+F) ratios between 0.13 and 0.14 had a beneficial effect on the design of AASC mortar.
A Study on Estimation Model of Strength Development of Concrete Using Fly Ash and Ground Granulated Blast-Furnace Slag
Choi, Yun-Wang ; Park, Man-Seok ; Jeong, Jae-Gwon ; Choi, Byung-Geol ; Kim, Kyung-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 87~93
DOI : 10.11112/jksmi.2013.17.5.087
Recently, the amount of the mineral admixture including fly ash and ground granulated blast-furnace slag was increased for the purpose of
gas emission reduction in the concrete industry. However, in the case of korea, estimation model of strength development in concrete structural design code was prescribed a constant value according to cement type and curing method about the portland cement. therefore, the properties of strength development according to time of concrete using fly ash and ground granulated blast-furnace slag does not reflected estimation model of strength development. Accordingly, this paper was evaluated strength according to time on the concrete strength range using fly ash and ground granulated blast-furnace Slag and the strength development constant
of concrete according to the kind of the mineral admixture and mixing ratio was proposed.
Effect of Substrate Surface Water on Adhesive Properties of High Flowable VA/VeoVa-modified Cement Mortar for Concrete Patching Material
Do, Jeong-Yun ; Kim, Doo-Kie ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 94~104
DOI : 10.11112/jksmi.2013.17.5.094
Experiments were divided into two parts; one part is to understand the basic properties of high flowable VA/VeoVa-modified cement mortar with different polymer cement ratio (P/C) and the weight ratio of fine aggregate to cement (C:F) and the other part is to investigate the effect of surface water spread on the concrete substrate on adhesion in tension. To understand the basic performance, the specimens were prepared with proportionally mixing VA/VeoVa redispersible powder, ordinary portland cement, silica sand, superplasticizer and viscosity enhancing agent. Here, P/C were 10, 20, 30, 50 and 75% and C:F were 1:1 and 1:3. As the change of P/C and C:F unit weight, flow test, crack resistance and adhesion in tension were measured. Three specimens with good adhesion properties were selected among specimens with different P/C and C:F. The effect of surface water evenly sprayed on concrete substrate on adhesive strength is investigated. The results show that surface water on concrete substrate increases the adhesion in tension of high flowable VA/VeoVa-modified cement mortar and additionally improves the flowability compared to the non-sprayed case.
Applicability of Impact-Echo Method for Assessment of Residual Strength of Fire-Damaged Concrete
Shin, Sung-Woo ; Kim, Seung-Yong ; Kim, Jeong-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 105~112
DOI : 10.11112/jksmi.2013.17.5.105
In this study, the applicability of impact-echo method for assessment of residual strength of fire-damaged concrete is investigated. A series of standard fire test is performed to obtain fire-damaged concrete specimens. Impact-echo tests are executed on the specimens and the responses are analyzed. Compressive strengths of the fire-damaged concrete are evaluated and correlated with the ultrasonic wave velocities determined from the impact-echo responses. The effectiveness of impact-echo based ultrasonic wave velocity measurement for assessment of residual strength of fire-damaged concrete is discussed.
Study on the Development of Road Icing Forecast and Snow Detection System Using State Evaluation Algorithm of Multi Sensoring Method
Kim, Jong-Woo ; Jung, Young-Woo ; Nam, Jin-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 113~121
DOI : 10.11112/jksmi.2013.17.5.113
The road icing forecast and snow detection system using state evaluation algorithm of multi sensor optimizes snow melting system to control spread time and amount of chemical spread application This system operates integrated of contact/non-contact sensor and infrared camera. The state evaluation algorithm of the system evaluates road freezing danger condition and snowfall condition (snowfall intensity also) using acquired data such as temperature/humidity, moisture detection and result of image signal processing from field video footage. In the field experiment, it proved excellent and reliable evaluated result of snowfall state detection rate of 89% and wet state detection rate of 94%.
The Risk Factor Analysis of Power Line Tunnel Using the AHP Method in Construction Stage
Woo, Sang-Kyun ; Kim, Kyung-Jin ; Kim, Tae-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 122~129
DOI : 10.11112/jksmi.2013.17.5.122
In this study, the risk factors which derive from the ground condition of typical construction sites are put forward. In order to prioritize the risk elements, the analytical method of AHP was used. The result of using a weighting factor for each risk analysis showed that if the constituency index is less than 0.1, then reliable results and priorities for each of the risk elements can be calculated using the AHP method. From now on, if the range of measured value can be established, the risk or safety value of concrete structures for power lines can be applicable.
Study about the Evaluation of Freezing Risk Based Road Surface of Solar Radiation
Lee, Dong-Hyun ; Jeong, Won-Seok ; Kim, Hong-Jin ; Kim, Jiwon ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 130~135
DOI : 10.11112/jksmi.2013.17.5.130
Anti-icing system can reduce traffic accidents and congestion by quickly removing the frozen road surface area. there is no decision criteria for determining application of the Anti-icing system in Korea. In this study, we proposed the decision criteria for determining application of the anti-icing system based on weather and road conditions, i.e., geometric and topographic conditions. Regional climate survey, Solar Radiation analysis, and dynamic vehicle simulation considered road geometry was conducted to standardize the installation method of anti-icing system. Also, we have developed a software that can be determined an installation of anti-icing system.
Analytical Study for Optimal Reinforcement Amount and Development of FRP Seismic Reinforcement that can be Emergency Construction
Kim, Jin-Sup ; Kwon, Min-Ho ; Seo, Hyun-Su ; Lim, Jeong-Hee ; Kim, Dong-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 5, 2013, Pages 136~145
DOI : 10.11112/jksmi.2013.17.5.136
Social interest in the seismic retrofit of the structure is growing massive earthquake that occurred recently. The brittle fracture of Non-seismically designed Columns lead to full collapse of the building. In the past, cross-sectional expansion method, a steel plate reinforcing method is applied mainly in recent years, fiber-reinforced method utilizing the advantages of the composite material are preferred. However, the reinforcement methods such as this, there is a drawback to induce physical damage to structures, and time consuming work space is large. IIn this study, FRP seismic reinforcement was developed using the Aluminum connector and the composite material (Glass Fiber Reinforced Polymer). Then, the optimum quantities of FRP seismic reinforcement was determined using a nonlinear finite element analysis program. Finally, the quantity decision process through the design and analysis of FRP reinforcement was suggested.