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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 16, Issue 6 - Nov 2012
Volume 16, Issue 5 - Sep 2012
Volume 16, Issue 4 - Jul 2012
Volume 16, Issue 3 - May 2012
Volume 16, Issue 2 - Mar 2012
Volume 16, Issue 1 - Jan 2012
Selecting the target year
An Experimental Study on the Fundamental Properties of Zeolite Concrete
Jo, Byung Wan ; Choi, Ji Sun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 1~8
DOI : 10.11112/jksmi.2012.16.1.001
Since the cement industry is expected to face serious setbacks in the near future associated with environmental concerns. With the advent of new technologies and increased public awareness about global environmental issues, the cement industry is actively seeking to adopt new technologies as part of an effort to diversity its resources. This study is designed to assess the fundamental properties of zeolite cement concrete which consists mainly of natural zeolite, which is known for removal of and harmful gas, ion exchange capacity removing cation contaminant including heavy metals and ammonia, absorptive capacity and molecular sieving effect together with excellent insulation capacity as a porous material, and recently draws much attention for its possibility as an alternative material to cement. The study was conducted to show the compressive strength of concrete, slump, bleeding and air volume according to the changes of natural zeolite and alkali activator(NaOH). As a result of measuring the compressive strength of natural zeolite concrete, it was almost 40MPa and displayed similar to general concrete in the tests of slump, bleeding and air volume, with which it was considered that it may be used as a future high performance, high performance construction material.
Verification on the Compressive Behavior of Corrugated Steel Plates due to Details of Bolted Lap Joint
Oh, Hong Seob ; Nam, Ki Wook ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 9~17
DOI : 10.11112/jksmi.2012.16.1.009
This study is dealt with the experimental seam strength of deep corrugated steel plate which is used as underpasses, storm sewers and other buried applications. The soil-metal structure using deep corrugated plate should be sufficient to ensure safety for compressive loading. The experimental and theoretical results on the seam strength are accumulated enough to take the design guideline, even if the seam strength at the bolt connected lap joint in construction site can be varied depending on the connection detailing and the thickness of plate. In this study, compressive behavior of bolted lap jointed plates using various connection detail such as gasket, slot hole, washer was experimentally analyzed. From the test, failure pattern with an increases in the thickness of specimens was changed from plate bearing to bolt shearing. In case of thicker plates than 6.0mm, the structural performance of lap joint using gasket and slot hole is more effective than it of the plate adopted washer.
Retrofit Capacity of Near-Surface-Mounted RC Beam by using FRP Plate
Seo, Soo Yeon ; Choi, Ki Bong ; Kwon, Yeong Sun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 18~26
DOI : 10.11112/jksmi.2012.16.1.018
Recently, research about Near-Surface-Mounted Rertofit (NSMR) method has been being widely performed as a method for retrofit of RC structure using FRP. This method requires additional work to make grooves during retrofit but makes it possible to improve retrofit effect and reduce the attack by environment. In this paper, the retrofit effect of NSMR method, especially the method using FRP plate instead of bar is investigated through experiment. Six RC beams were made and retrofitted using by FRP plate following the planned methods; Surface-Bonding Retrofit (SBR), NSMR without debonding region and NSMR with debonding region. Flexural capacity of all specimens was evaluated by beam test with simple support condition. As a result, NSMR method with FRP plate had more improved structural capacity than SBR method. The calculation process of ACI 440-2R can be used to predict the member retrofitted by NSMR with FRP plate with consideration on the three anchorage failure mechanism.
Evaluation on Stiffness of Mortar-filled Sleeve Splice Using Estimation Method of Failure Mode
Kim, Hyong Kee ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 27~34
DOI : 10.11112/jksmi.2012.16.1.027
The objective of this study is to evaluate the stiffness of mortar-filled sleeve bar splice using estimation method of failure mode in the sleeve reinforcement splice. To attain this goal, we analyzed the test results of 261 actual-sized mortar-filled sleeve splice specimens. The study results showed that the estimation method of the failure mode in mortar-filled sleeve bar splice made an effective estimate of the stiffness in this bar splice with the exception of specimens with SD500 bars and smooth pipe sleeve. Especially, of the specimens with cast sleeve or uneven pipe sleeve in the range of reinforcement fracture using the estimation method of the failure mode in mortar-filled sleeve splice, specimens over 98% with SD400 bars and all specimens with SD500 bars had the stiffness capacity of higher than "A" class of AIJ code in monotonic loading. In addition, of the specimens in the range of reinforcement fracture using the estimation method of the failure mode in mortar-filled sleeve splice, all specimens with SD400 bars and SD500 bars had the stiffness capacity of higher than "A" class of AIJ code in cyclic loading.
Impact Factor Analysis of Response Adjustment Factor of PSC Composite Bridge Using Optical Fiber Sensor
Kim, Ho Sun ; Jang, Hwa Sup ; Yang, Dong Woon ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 35~43
DOI : 10.11112/jksmi.2012.16.1.035
In general, load carrying capacity, one of the load & resistance capacities in bridges, has more margins than the load carrying capacity evaluated with theoretical methods, unless there are severe damages, defects or material deterioration phenomena that can have a great impact on the behavior of bridges. However, errors have been already included in the current processes of loading tests and structural analysis for measuring load carrying capacity, thus devaluing the reliability of response adjustment factor. Therefore, this study found out the problems of existing electric resistance strain and displacement sensors in sensor suite to solve the problems with sensors and the errors in the appropriateness of structural analysis model, thereby leading to the changes into an optical fiber smart sensor with excellent performance. Besides, the study attempted to ensure the accuracy of response adjustment factor by selecting the optimal models through the interpretation of various structural analysis models.
Parametric Study on Long-Term Deflections of Flat Plates Considering Effects of Construction Loads and Cracking
Choi, Seung Min ; Eom, Tae Sung ; Kim, Jea Yo ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 44~54
DOI : 10.11112/jksmi.2012.16.1.044
The structural designs of RC flat plates that have no flexural stiffness by boundary beams may be governed not by strength conditions but by serviceabilities. Specially, since over-loading and tensile cracking in early-aged slabs significantly increase the immediate and long-term deflections of a flat plate system, a construction sequence and its impact on the slab deflections may be decisive factors in designs of flat plate systems. In this study, the procedure of calculating slab deflections with considering construction sequences, concrete cracking, and long-term effects is proposed. Using the proposed method, the parametric study for deflections of flat plates is performed. With various conditions for slab construction cycle, the number of shored floors, tensile or compressive reinforcement ratio, compressive strength of concrete, construction live load, and slab thickness, the immediate deflection during construction and long-term deflections after completion are analyzed. The calculated results are compared with the serviceability limits offered by the structural design code.
Strain-Hardening Cementitious Composites with Low Viscosity Suitable for Grouting Application
Lee, Bang Yeon ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 55~63
DOI : 10.11112/jksmi.2012.16.1.055
This paper presents materials and processing technique to manufacture low viscous strain-hardening cementitious composite which is suitable for structures requiring low viscosity of materials. The micromechanics and fracture mechanics tools coupled with processing techniques were adopted to achieve low viscosity of composites as well as high tensile strain capacity. Optimal volume and length of fibers and interfacial properties between fibers and matrix for composites with tensile strength of 2~3MPa were determined on the basis of the micromechanical analysis and the steady-state cracking theory. Then six mixtures were determined and the experiment was carried out to evaluate the viscosity and uniaxial tensile performance of those. From the test results, it is verified that the strain-hardening cementitious composite with low viscosity suitable for grouting applications in fresh state as well as high ductility over 1.5% in hardened state can be feasible.
Development of Automatic Crack Detection System for Concrete Structure Using Image Processing Method
Lee, Ho Beom ; Kim, Jong Woo ; Jang, Il Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 64~77
DOI : 10.11112/jksmi.2012.16.1.064
In this study, the crack detecting system with digital image processing techniques based on the mathematical morphology method was developed to detect cracks in concrete structures. In the developed system, the image combining technique of reconstructing multiple images as an entire single image considering efficient management of analysis results was applied as an additional module. The developed system was verified through a field test with the cracked concrete culvert and the crack width of 0.2 mm was able to be detected in the 40m span. In the image analysis, the difference between calculated crack width and actual crack width were less than 0.08mm. For image combination in the stitching test of pattern images, the stitched image was identical with the original picture of entire subject in the visual perception level.
Shear Behavior of Prestressed Steel Fiber-Reinforced Concrete at Crack Interfaces
Kal, Kyoung Wan ; Hwang, Jin Ha ; Lee, Deuck Hang ; Kim, Kang Su ; Choi, Il Sup ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 78~88
DOI : 10.11112/jksmi.2012.16.1.078
Although structural concrete is well known for its good economic efficiency, it has limits of structural performance due to the low tensile strength, for which new structural members utilizing various concrete composite materials have been developed. Steel Fiber-Reinforced Concrete(SFRC) has great tensile strength, which is the one of the excellent composite material to complement the weakness of concrete, and it is also considered as a good alternative to prevent the explosive failure of high strength concrete under fire. Also, prestressed concrete members are of great advantages to long span structures and have greater shear strength compared to conventional reinforced concrete members. In this research, thus, a total of 22 direct shear test specimens were fabricated and tested to understand the shear behavior of Steel Fiber-Reinforced Prestressed Concrete(SFR-PSC) members, in which SFRC members combined with prestressing method. Based on the test results, the constitutive equations of shear behavior at crack interfaces were proposed, which provided good estimation on the shear behavior of the SFR-PSC direct shear test specimens.
Development of Steel Wire-Integrated Deck Plate Applicable to Slab with 180mm Thickness
Lee, Yong Jae ; Yoon, Sang Chun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 89~98
DOI : 10.11112/jksmi.2012.16.1.089
A steel wire-integrated deck plate that welds integrated triangle truss steel wires on a galvanized steel sheet is developed to reduce construction costs of slabs or formworks such as shores and supports, and it is already widely applied in many construction fields. In this research, experimental tests for 14 full scale specimens, which are in the same field conditions, are conducted on several parameters such as the diameter of top, bottom and lattice steel wire, cutting methods of ends. According to the result, changes in final destruction types of the test bodies and cutting methods of ends didn't affect structural performance of test specimens, and for a 4.0m-span test specimen, there was no big problems in using bottom bar D7 or D8.
A Study on Development of Structural Health Monitoring System for Steel Beams Using Strain Gauges
Hahn, Hyun Gyu ; Ahn, Hyung Joon ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 99~109
DOI : 10.11112/jksmi.2012.16.1.099
This study aimed to develop a Structural Health Monitoring System for steel beams in the manner of suggesting and verifying a theoretical formula for displacement estimation using strain gauges, and estimating the loading points and magnitude. According to the results of this study, it was found that when a load of 160kN (56% of the yield load) was applied, the error rate of the deflection obtained with a strain gauge at the point of maximum deflection compared to the deflection measured with a displacement meter was within 2%, and that the estimates of the magnitude and points of load application also showed the error rate of not more than 1%. This suggests that the displacement and load of steel beams can be measured with strain gauges and further, it will enable more cost-effective sensor designing without displacement meter or load cell. The Structural Health Monitoring System program implemented in Lab VIEW gave graded warnings whenever the measured data exceeds the specified range (strength limit state, serviceability limit state, yield strain), and both the serviceability limit state and strength limit state could be simultaneously monitored with strain gauge alone.
Enhancements in Performance and Manufacturing Efficiencies of GFRP Rebar
You, Young Jun ; Kim, Jang Ho ; Park, Young Hwan ; Park, Ji Sun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 110~119
DOI : 10.11112/jksmi.2012.16.1.110
Fiber reinforced polymer (FRP) reinforcing rebar with non-corrosive property is suggested as an alternative replacement to steel reinforcing rebar due to its enhanced durability and non-corrosive characteristics. Currently, a limited number of glass fiber reinforced polymer rebar (GFRP) are sold commercially due to their high cost, relatively low performances, and brittle failure characteristics. Therefore, the performance enhancements and cost reduction of GFRP rebar are needed to increase its applications in construction fields. The intent of this study is to develop high performance GFRP rebar by improving its tensile and shear properties. Also, in order to reduce manufacturing costs, factors such as material composition and manufacturing process were evaluated to improve manufacturing efficiency. Finally a GFRP rebar with enhanced material properties and less expensive than the GFRP rebar currently sold in the market was manufactured and evaluated for its application possibility in construction fields.
Development of Ubiquitous Sensor Network Intelligent Bridge System
Jo, Byung Wan ; Park, Jung Hoon ; Yoon, Kwang Won ; Kim, Heoun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 120~130
DOI : 10.11112/jksmi.2012.16.1.120
As long span and complex bridges are constructed often recently, safety estimation became a big issue. Various types of measuring instruments are installed in case of long span bridge. New wireless technologies for long span bridges such as sending information through a gateway at the field or sending it through cables by signal processing the sensing data are applied these days. However, The case of occurred accidents related to bridge in the world have been reported that serious accidents occur due to lack of real-time proactive, intelligent action based on recognition accidents. To solve this problem in this study, the idea of "communication among things", which is the basic method of RFID/USN technology, is applied to the bridge monitoring system. A sensor node module for USN based intelligent bridge system in which sensor are utilized on the bridge and communicates interactively to prevent accidents when it captures the alert signals and urgent events, sends RF wireless signal to the nearest traffic signal to block the traffic and prevent massive accidents, is designed and tested by performing TinyOS based middleware design and sensor test free Space trans-receiving distance.
Effect of High Temperature on Mechanical Properties of Confined Concrete with Lateral Reinforcement
Choi, Kwang Ho ; Lee, Joong Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 131~139
DOI : 10.11112/jksmi.2012.16.1.131
The lateral reinforcements of concrete such as hoops and spiral bars are known to confine concrete to compensate the strength loss due to fire by reducing explosive spalling and improving the capacity of ductility. In this context, a study was conducted to investigate the residual mechanical properties of confined and unconfined concrete(
=60MPa) after a single thermal cycle at 300, 600,
. The main parameters required to establish the stress-strain relationship are the peak stress, the elastic modulus, and the strain at peak stress. The knowledge of the residual mechanical properties of concrete is necessary whenever the thermally damaged structure is required to bear a significant share of the loads, even after a severe thermal accident. Based on the results obtained in this study, the residual stress of confined concrete under thermal damage is higher according to the level of confinement and the larger strain made it to have better ductility. The decreasing ratio of elastic modulus from the relationship of stress and strain was also smaller than that of unconfined concrete.
Development and Seismic Performance of Vertical Joints in Precast Concrete Shear Walls under Cyclic Loads
Kim, Ook Jong ; Oh, Jae Keun ; Kang, Su Min ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 1, 2012, Pages 140~148
DOI : 10.11112/jksmi.2012.16.1.140
Recently there are many attempts to introduce PC construction method in buildings. But the study on PC structural wall has been made progress so slowly because it is very difficult to develop new items. In this study, we have developed new vertical joint on PC wall in order to upgrade constructivity and structural performance of the existing connections, then we have evaluated the seismic resistance performance. As a result of the cyclic loading tests for two specimens, proposed vertical joint on PC wall has shown that it behave the excellent structural performance in comparison to PC wall having no joint. Therefore, we think that proposed vertical joint is the system to apply buliding structure.