Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 12, Issue 6 - Nov 2008
Volume 12, Issue 5 - Sep 2008
Volume 12, Issue 4 - Jul 2008
Volume 12, Issue 3 - May 2008
Volume 12, Issue 2 - Mar 2008
Volume 12, Issue 1 - Jan 2008
Selecting the target year
Advanced SIT Technique Using Wireless Laser Sensors
Kim, Jong-Woo ; Jho, Youn-Beom ; Cho, Myung-Sug ; Yoon, Deok-Joong ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 3~7
Application of Ground Saturation Measuring System(SMART POLE) for the Prediction and Warning System of Soil Cut-Slope Collapse
Kim, Jong-Woo ; Cho, Youn-Beom ; Rhim, Hong-Chul ; Choi, Jun-Seong ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 8~16
Structural Safety & Hazard Monitoring Technique Using Image Processing
Kim, Jong-Woo ; Ahn, Sang-Ro ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 17~22
The New Construction Method of Parking Zone Under the Building on the Soil Ground
Byun, Hang-Ryong ; Kim, Jun-Seong ; Byun, Su-Min ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 23~30
A Precise Safety Diagnosis Case on Steel Pile Constructed by SIP(Soil-cement Injected Precast Pile Method)
An, Young-Ki ; Lee, Chae-Gue ; Kwon, Sang-Moon ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 31~38
Flow-Chart for Influence Estimation of Underwater Blasting
Park, Sun-Joon ; Park, Yeon-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 47~54
In this study, ground vibration values and damping coefficient produced by underwater blasting were measured and analyzed. Equations of vibration,
, were presented from quantitative experiment results. The K Values are classified with 1.507, 2.005 and 2.939 respectively at 50%, 90% and 95% reliability. Also, hydrospace noise in aquafarm and noise in atmosphere as well as ground vibrations were measured, and maximum values of these results were 86.8dB(A), 147.8dB(A), 0.244cm/s, respectively. Equations of hydrospace noise,
, was presented from quantitative experiment results. Also, the flow-chart for influence estimation and underwater blast design was presented from these results. The results of the study may be applied for the evaluation of the influence on aquafarm as a basic data before having main underwater blasting at construction sites.
Deterioration Properties of Shotcrete as Tunnel Supporter was Exposed to Harmful Ions
Jung, Ho-Seop ; Kim, Dong-Gyou ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 55~64
Shotcrete have become a deterioration which was exposed to harmful environments. In this study, in order to evaluate the deterioration properties of shotcrete, visual examination, compressive strength, adhesive strength, microstructural analysis were investigated up to the 60th weeks of exposure. The attack solutions for test are sodium sulfate and hydrochloric acid solution with different concentrations, respectively. From the results, although the compressive strength of shotcrete specimens and the adhesive strength between specimens and rocks were high at the early immersion age, they rapidly dropped in the subsequent phases, especially in 5% sodium sulfate and pH1 hydrochloric acid solution. With continued exposure, various harmful ions penetrated into the shotcrete specimen, reacted with the cement hydrate, and generated expansion substances. It was verified that the shotcrete specimens suffered a serious deterioration by chemical attack.
An Application of LTR Method in a DUOX System to Control a MDOF Structure Subjected to the Seismic Excitations
Lee, Jin-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 65~73
Retaining large stability margin is essential in designing a feedback control system to deal with the uncertainties inherently existing in the mathematical model and the control apparatus. The LQG controller in general loses the stability margin due to the embed Kalman filter. The performance of a control system called LTR with a DUOX structure(LTR/DOUX) to overcome the demerit of LQG controller is to be investigated from the responses in both the time and the frequency domain. The results indicated that the LTR/DOUX recovered the gain margin of 30dB approximately 20 times more than that of LQG/DOUX, resulting in a robust stable control system.
Seismic Performane Evaluation of Flat Plate System Considering Column Aspect Ratio
Lee, Hyun-Ho ; Chun, Young-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 74~80
This paper evaluates seismic capacities of slab-column joints in flat plate system which has columns with various aspect ratio as experimental parameters. Continuous - bended shear reinforcements were applied for the prevention of punching shear failure in this study. The specimens of FIS1-05, FIS1-10, and FIS1-20 have the aspect ratio of 0.5, 1.0, and 2.0 respectively. Static lateral force was applied to the specimens in a horizontal direction and vertical load was applied by constant gravity load ratio. The test results were evaluated by lateral displacement and strength of slab-column joint. Consequently, the lateral resisting capacity of rectangular type column such as FIS1-05, FIS1-20 is superior to the square type column such as FIS1-10.
Evaluation on Flexural Capacity of Reinforced Concrete Beams with Ultra-High Performance Cementitious Composites
Kang, Su-Tae ; Park, Jung-Jun ; Koh, Gyung-Taek ; Kim, Sung-Wook ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 81~90
This paper concerns the flexural capacity of reinforced concrete beams with ultra-high performance cementitious composites(UHPCC). It was investigated if the existing equations to estimate the flexural capacity of reinforced fiberous concrete beams are applicable with the experiments including lightly reinforced concrete beams. The reinforcing effect when the steel fiber reinforced concrete was used in beams was also estimated. The results showed that the equation to predict the flexural capacity of reinforced steel fiber concrete by ACI 544 committee didn't have a good agreement with the test results and underestimated the flexural capacity in especially lightly reinforced beams with under 1.5% reinforcement ratio. the enhancement of flexural capacity was quite considerable in lightly reinforced beams when the steel fiber reinforced concrete was used. A equation to predict the reinforcing effect of steel fiber in reinforced steel fiber beams was developed. the equation was proposed as a function of both the characteristics of steel fiber and reinforcement ratio.
Evaluation & Development of Strengthening Method by External Post-tension
Lim, Jae-Hyung ; Moon, Jeong-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 91~100
A technique strengthened to the reinforced concrete members using the external post- tensioned method offers the advantages in speed and simplicity of installation over other, established, strengthening techniques. But this technique has many unreasonable facts. This paper are analyzed an unreasonable facts of the previous external post-tension technique. The purpose of this paper proposed Bow system as the new technique strengthened to the reinforced concrete members. The Bow system which is better technique than the previous technique was introduced with the experimental/analytical data.
Pullout Bond Characteristics of Untensioned Prestressing Strand
Ha, Sang-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 101~108
The primary objective of this research is a study on the pullout bond characteristics of untensioned prestressing strand in concrete. The bond characteristics of untensioned prestressing strand in concrete differs from that of deformed reinforcing bar. In order to use and design untensioned prestressing strand as deformed reinforcing bar, a study for bond characteristics of the untensioned prestressing strand was progressed. Major test variables are embedment length (
), concrete cover (45mm, 70mm, 100m) and diameter of strands. (12.7mm : SWPC7, 9.3mm : SWPC7A) As a results, these showed that average bond stress was decreased as a growing the embedment length, and then showed that the bond performance of untensioned prestressing strand was improved if embedment length was above 60
An Experimental Study of Tension Properties on New Developed Up-Set Coupler
Sim, Jong-Sung ; Park, Cheol-Woo ; Kang, Tae-Sung ; Kim, Tae-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 109~115
As structures are getting super-rise and large-sized, introducing the construction methods such as prefabrication of bar-meshes and complex method are being actively discussed to pursue the high quality of reinforced concrete, the simplification of field works, and the reduction of duration, as well as the study on how to connect reinforcing rods, which occurs while applying the same methods, is in progress Also, the pressure welded joint is a kind of method that heats the ends of reinforced bars locally and joint them, and after the pressure welding, the vulnerable part in the reinforced bar occur. Thus, in the construction field, the throughout quality control is necessary because of the delayed duration and the lowered construct ability. In this study, of the traditional lap splice method and the mechanical splice one, the screw coupler, we tried to look into through experiments the prefabrication method of bar-meshes, a typical joint method usually used for the joint parts for PSC structures applying the reinforced bar with its big diameter, and a newly-developed up-set coupler method. And we also examined the characteristic of tensile.
Behavior Analyses of Ring Beam at Vertical Wall with Change of Excavation Depth
Park, Jin-Eun ; Kyung, Kab-Soo ; Lee, Jun-Ho ; Yoon, Cheol-Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 116~124
In order to evaluate the behavior patterns of the ring beam by excavation at the vertical wall with circular section, the measured field datum were analyzed and evaluated in this study. Additionally, stress patterns of the ring beam with the change of excavation depth were estimated by using FE analysis. As the results, it was shown that the tendency of the measured values for the behavior patterns of the ring beam is similar to the analyzed values in FE analysis. From the tendency, it was confirmed that the behaviors of the ring beam due to change of excavation depth can predict by FE analysis using the suggested method in this study.
Optimal Weight Design of Steel Structures Using Adaptive Simulated Annealing Algorithm
Bae, Jun-Seo ; Hong, Seong-Uk ; Cho, Young-Sang ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 125~132
Structural optimization is widely adopted in the design of structures with the development of computer aided design and computer technique recently. By applying the structural optimization in the last decades, designers have gained the design scheme of structures more feasibly and easily. In this paper, an optimal design of one 30-story high rise steel structure is performed considering material non-linearity. Based on finite element analysis and adaptive simulated annealing algorithm, the optimal weight of structure is derived under constraints of allowable yield stress, shear stress and serviceability.
A Study on Chloride Binding Capacity of Various Blended Concretes at Early Age
Song, Ha-Won ; Lee, Chang-Hong ; Lee, Kewn-Chu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 133~142
This paper studies the early-aged chloride binding capacity of various blended concretes including OPC(ordinary Portland cement), PFA(pulversied fly ash), GGBFS(ground granulated blast furnace slag) and SF(silica fume) cement paste. Cement pastes with 0.4 of a free water/binder ratio were cast with chloride admixed in mixing water, which ranged from 0.1 to 3.0% by weight of cement and different replacement ratios for the PFA, GGBFS and SF were used. The content of chloride in each paste was measured using water extraction method after 7 days curing. It was found that the chloride binding capacity strongly depends on binder type, replacement ratio and total chloride content. An increase in total chloride results in a decrease in the chloride binding, because of the restriction of the binding capacity of cement matrix. For the pastes containing maximum level of PFA(30%) and GGBFS(60%) replacement in this study, the chloride binding capacity was lower than those of OPC paste, and an increase in SF resulted in decreased chloride binding, which are ascribed to a latent hydration of pozzolanic materials and a fall in the pH of the pore solution, respectively. The chloride binding capacity at 7 days shows that the order of the resistance to chloride-induced corrosion is 30%PFA > 10%SF > 60%GGBFS > OPC, when chlorides are internally intruded in concrete. In addition, it is found that the binding behaviour of all binders are well described by both the Langmuir and Freundlich isotherms.
Optimum Design of Plane Steel Frames Using Second-Order Inelastic Analysis and Section Increment Method
Choi, Se-Hyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 143~151
In this paper, the optimum design of plane steel frames using second-order inelastic analysis and section increment method is presented. Since the second-order inelastic analysis accounts for geometric and material nonlinearities of the whole system as well as its component members, the design method based on second-order inelastic analysis does not require separate member capacity checks after analysis. A section increment method proposed by this paper is used as optimization technique. The weight of structures is treated as the objective function. The constraint functions are defined by load-carrying capacities, deflections, inter-story drifts, and ductility requirement. The effectiveness of the proposed method are verified by comparing the results of the proposed method with those of other method.
Behavior of Coupling Shear Wall with New Openings
Choi, Hyun-Ki ; Choi, Youn-Cheul ; Choi, Chang-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 152~160
Since wall system apartment used the shear wall as main lateral resistance member, installation of openings which causing section loss of walls may cause significant problem to structure. Also, there are few studies for inducing coupling beam or slabs which are occurred by installing openings. Therefore, this study planned isolated 2-story shear walls which are reduced three half-scale specimen to find out walls behavior characteristic. The test results showed that strength reduction caused by loss of effective section of walls and different result of stiffness and energy dissipation regarding to the coupling beam and coupling slabs.
The Effect of Entrained Air Contents on the Properties of Freeze-thaw Deterioration and Chloride Migration in Marine Concrete
Park, Sang-Joon ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 161~168
The freeze-thaw deterioration and chloride attack, which are the typical degradation factors for durability of marine concrete, are significantly affected by pore structures in terms of penetration and diffusion. These pore structures of concrete are closely related to the types and amount of AE agent, used to guarantee the resistance of freeze-thaw deterioration, and the elapsed time before concrete pouring. This paper evaluates the durability of concrete based on the results of tests on cylinder specimens and core specimens from mock-up members with different air content of 4~6% and 8~10%, respectively. According to the test results, the air content of hardened concrete is 2.5~5.2% at 7 days and 2.4~5.1% at 28 days. These air contents are about half of the initial values just after the concrete mixing. Judging from the amount of scale after the freeze-thaw test completed, air content of 8~10% is slightly more beneficial against the deterioration of concrete than air content of 4~6%. Meanwhile, the core specimens from mock-up members exhibit somewhat unfavorable freeze-thaw deterioration and chloride migration characteristic compared with the cylinder specimens tested in the laboratory under the same mixing condition, as to show 106% in freeze-thaw test and 160% in chloride diffusion coefficient test, respectively.
Nonlinear Analysis of Compressive Flange Based on Folded Plate Theory
Jung, Soo-Hyung ; Shim, Jae-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 169~178
Compressive flanges of steel box girder is designed based on the ultimate strength behavior of sub-panel which is enclosed with longitudinal stiffeners and transverse stiffeners on appropriate safety factor. However, it is rational that the ultimate strength is calculated considering the various factors such as number and stiffness of longitudinal stiffener, spacing of transverse stiffener, initial deformation and residual stress distribution. In this study, an analysis program based on Folded Plate theory is developed considering the geometric effects and the material nonlinearity. The analysis program is applicated to the steel box girder bridges which is really constructed in domestic.
Optimal Active Seismic Control of Structures with Optimum Location of Active Controllers
Cho, Chang-Geun ; Kwon, Joon-Myoung ; Park, Tae-Hoon ; Park, Moon-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 5, 2008, Pages 179~189
The object of this study is to develope a program with proposed numerical techniques for an optimal seismic control of structures using active tendon systems. Ricatti closed-loop algorithm has been applied to control the active tendon systems with time-delay problem. The optimal control is formulated as an optimization problem which is finding optimal weighting matrices by minimizing the quadratic performance index by SUMT. In order to find the optimal location of active tendons in structures, controllability index has been introduced. From numerical examples, the current optimal control technique with optimal location of tendons was suitable to control the seismic response of structures.