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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
Seismic Hazard of Electric Power System
Kim, Min-Ku ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 3~13
Seismic Fragility Evaluation of Substation System in Korea
Kim, Min-Ku ; Choun, Young-Sun ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 14~23
Seismic Safety Assessment of Nuclear Power Plant
Choi, In-Kil ; Kim, Min-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 24~32
Automatic Measuring System of Vertically Moving Type
Woo, Jong-Tae ; Kim, Young-Bae ; Won, Ki-Eun ; Kim, Chung-Kyum ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 33~38
Report on Aqueduct Made of Steel
An, Young-Ki ; Lee, Chae-Gue ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 39~53
Lateral Resistance Behavior Analysis of Drilled Shafts in Multi-layered Soil
Jang, Seo-Yong ; Jeong, Jae-Hoon ; Kim, Jong-Ryeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 61~70
In this research, load-transfer-function method was selected, because that is widely used in geotechnical engineering among the analysis methods to verify the behavior of load-lateral displacement. Lateral loading test of field scale was conducted, this measured data was analyzed. From the analysis, the model of load-lateral displacement was suggested. The test results were studied and compared to the commercial programs, 'LPILE', which contain the load transfer functions proposed before. By analysis of measure data of load-lateral displacement that expressed to several functions,
model was the simplest and applicable to the field. In that case a value converged about 1.3, b value had a tendency to converge about 0.02. From the comparison analysis between measured data and load transfer function by 'LPILE', it is examined that if the lateral load is small, calculated displacements of them show a similar value compared to measured values. Furthermore, the bigger lateral loads, the bigger calculated values compared to the measured data. If the results are compared by Matlock-Reese method and Matlock-API method, Matlock-Reese method shows result of safe side because lateral displacement is calculated greatly relatively.
An Experimental Study to Evaluate the Stiffness of Fastening Systems - Translational Stiffness along the Vertical Axis of Rail, Rotational Stiffness along the Strong Axis of Rail -
Kim, Jung-Hun ; Han, Sang-Yun ; Lim, Nam-Hyoung ; Kang, Young-Jong ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 71~78
In the case of the railway bridges, uplift forces were occurred at the edge of the segments when vehicular loads were applied. These forces caused the compressive and tensile forces in the fastening system. In the past, a structural analysis has been performed to investigate the safety of fastening system which was modeled with one directional spring elements based on the compressive test of fastening system. In this case, the stiffness of the spring element was obtained from experimental study which was conducted by compressive load. Therefore, to perform rational and exact structural analysis, the translational stiffness of the fastening system obtained from the experimental study applied the tensile load and the rotational stiffness should be considered because it was occurred the tensile force as well as the compressive force in fastening system. In this study, an elastic and inelastic experimental study was performed for six specimens. The translational stiffness along the vertical axis of rail and the rotational stiffness along the strong axis of rail were investigated, also structural behavior of the fastening system was analyzed.
Experimental Study on the Retrofit Method to Improve the Structural Capacity of Reinforced Concrete Shear Wall
Ha, Gee-Joo ; Seo, Soo-Yeon ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 79~86
Four RC shear wall specimens with a/d of 2.2 are designed. And a flexural retrofitting is performed for one specimen by both enlarging wall section and adding additional vertical reinforcements. Also the effectivity of jaketting wall sides is evaluated for the two methods using only steel plate or welded wire mesh with enlargement of section. Cyclic loads are applied to the retrofitted specimens according to the loading history proposed by ACI under constant axial force. Test result showed that the strength and ductility of specimen were improved where the section was enlarged after the installation of additional vertical reinforcements. Confining the ends of wall by U shape W.W.F. with enlargement of section showed most excellent structural capacity regarding to the strength and ductility. Retrofitting by using steel plate was much effective not only to protect the abrupt decrease of strength after yield but also to improve the deformation capacity.
Development of the Nonlinear Analysis Model on Flexural Behavior of Reinforced Concrete Beams Strengthened with Prestressed Carbon Fiber-Reinforced Polymer Plates
Woo, Sang-Kyun ; Nam, Jin-Won ; Kim, Jang-Ho ; Byun, Keun-Joo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 87~97
The purpose of this study is to analyse and compare experimentally flexural behavior of RC beams strengthened with CFRP plates by different methods, and finally develop the nonlinear analysis model with the aim of predicting the improving effects of structural capacity and the structural behaviors of RC beams. From this study, the characteristics of bond and flexural behavior of the prestressed CFRP plates were analyzed and examined. In deed, the beams were tested with experimental parameters of strengthening methods and prestressing level, and the developed analysis model was evaluated with the testing results. From this study, it is concluded that the developed analysis model have a good reliability and can be applied to the strengthening design of beams using CFRP plates.
Structural Behavior of RC Beam Strengthened with External Tendons Using Lifting Hole Anchorage System
Lee, Seok-Hoon ; Hong, Sung-Nam ; Han, Kyoung-Bong ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 98~106
The strengthening in terms of efficiency, easy, economics is very popular method when it is applied to a damaged structures. The purpose of this study develops anchorage system that supports enough strengthening effect without any damage. In addition it is checked whether the method can be conveniently applied to structures. To verify strengthening effect a flexural experiments were performed. Four concrete beams were constructed and tested. Deflections, strains and modes of failure were recorded to examine strengthen of beams. Comparing crack load of each experimental data, yielding load, ultimate load, ductility index, and tendon stress were analyzed.
A Study on Evaluation Model Developement for Investigation Priority Decision for Road Cutting Slopes Using Analytic Hierarchy Process
Shin, Chang-Gun ; Sung, Hyun-Jong ; Lee, Song ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 107~114
Currently, each managing agencies are enforcing the maintenance against the cutting slopes, but the universality and objectivity are insufficient, because the evaluation item and model are various, the access method is not mutual-supplementary. Consequently, this study will lead the approach for a rational model development, by the analysis against the existing cutting slope evaluation technique, excavate a collapse primary reason and a factor, by the collapse example analysis, and make out evaluation table to decide a investigation priority of the existing cutting slope in the Investigation Evaluation step using AHP.
Spalling Properties of the High Strength Concrete Containing PP Fiber Subjected to Fire Mixture Factors and Drying Condition
Han, Cheon-Goo ; Han, Min-Cheol ; Song, Yong-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 115~122
This paper is to investigate the affecting factors on spalling of the high strength concrete including W/B, air content and moisture condition as well as PP fiber contents subjected to fire. An increase with 0.05% of PP fiber resulted in a reduction of slump flow by as much as 11%. Ten percent of air contents due to excessive amounts of AE agent does not lead to variance of slump flow, regardless of PP fiber content. For the effect of the compressive strength, high strength concrete with 15, 25 and 35% of W/B gained 60 MPa~100 MPa of the compressive strength. High strength concrete with H-air had half of compressive strength of that with L-air due to large amount of air. Fire test was conducted in accordance with KS F 2257-1 for 1 hour. Spalling did not occur with all specimens containing more than 0.10% of PP fiber except those with 15% of W/B. Moreover, it is interesting to note that the specimens with more than 10% of air content and with oven dried condition, respectively, had no spalling even if the content of PP fiber is 0.05 vol.%.
The Study of Improvement Effect of Ground Settlements and Bearing Capacity by Stone Columns
Park, Sang-Kook ; Lee, Song ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 123~132
Aseries of in-situ tests and ground water level measurements with stone and slug materials had been conducted to find out effect of ground settlement reduction and bearing capacity improvement by the Stone Column method. As the result of the tests, it was proved that the Stone Column method is effective for reduction of ground settlement and improvement of bearing capacity. In addition the ground water level went down without overburden load. These results show that the Stone Column method is effective for an increase in density and resistance to liquefaction. The results of estimation of ground settlement and bearing capacity by general theoretical equation, it show that the Stone Column method increases bearing capacity by 2.7~5.7 times and decreases ground settlement by 2~3.5 times.
Realistic Estimate Method of Reinforced Concrete Column's Ultimate Strength Using the Nonlinear Finite Element Analysis Program
Cheon, Ju-Hyoun ; Kim, Ki-Ho ; Seong, Dae-Jeong ; Park, Jae-Guen ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 133~140
The design method of the reinforced concrete structures is converting from the current limit state design method to the reliability based design method and active studies have been done in the US, Europe, and Japan etc. Performance based design method is considering lots of uncertainty of current design provision rationally and make sure that structure have a reliable reliability and safety. The main area of these studies is to secure the non-linear analysis technology with high reliability. The data for reinforced concrete columns tested by many researchers are used to verify the applicability of the nonlinear finite element analysis program (RCAHEST, Reinforced Concrete Analysis in Higher Evaluation System Technology). A comparison is made between analysis and test, calculated safety factor based on reliability theories to applies to analysis result.
Static and Fatigue Behavior Characteristics of Reinforced Concrete Beams Strengthened with CFRP Plate
Kim, Kwang-Soo ; Kim, Jin-Yul ; Kim, Sung-Hu ; Park, Sun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 141~148
In the recent construction industry, Carbon Fiber Reinforced Polymers(CFRPs) have been highly considered as innovative strengthening materials for civil structures due to their superior material properties. This paper is to offer design data and strengthening efficiency of reinforced concrete beams strengthened with CFRP Plate. Static tests were carried out to evaluate failure modes and strengthening capacity. Displacements and strains of steel and CFRP plates were obtained and analyzed through a series of fatigue tests. Also, Those evaluated the energy dissipation. Results of the tests showed increase in strengthening ratios caused debonding failure at the end of beams. For the beams wrapped with CFRP sheets around the end of the plates, debonding failure mode that was induced from flexural cracks was indicated. Through the fatigue tests, it was observed that displacements, strains of steel and CFRP plates converged into certain values. It is also proved that the beams strengthened with CFRP plates are able to resist fatigue loading under serviceability.
Identify Modal Parameter by The Output Response of Structure Using Smart Sensor System
Lee, Woo-Sang ; Heo, Gwang-Hee ; Park, Ki-Tae ; Jeon, Joon-Ryong ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 149~160
In this study, the research was carried out on how to identify the modal parameter by acquiring the output response of the structure only through the smart sensor system. The objective of this research is to verify the performance and the on-site adaptability of the smart sensor system that have been actively researched as the advanced measuring system so far. Smart Sensor System was developed so that the real-time dynamic measurement can be performed by means of MEMS-type accelerated sensor, 8 bit CPU, wireless MODEM. In the modal parameter identification test, random excitation was added to the cantilever beam, and then the response of the structure was obtained using the smart sensor system and the wire measurement system respectively. In analyzing the data, modal parameter was identified using NExT & ERA algorithm. Furthermore, the optimal measurement location was selected through EOT algorithm in order to obtain the qualified output response. Result of the test, it was possible to verify the on-site applicability of the smart sensor.
Optimal Design of Trusses Using Advanced Analysis and Genetic Algorithm
Choi, Se-Hyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 161~167
In this paper, the optimal design of trusses using advanced analysis and genetic algorithm is performed. An advanced analysis takes into account geometric nonlinearity and material nonlinearity. The micro genetic algorithm is used as optimization technique. The weight of structures is treated as the objective function. The constraint functions are defined by load-carrying capacities and displacement requirement. The effectiveness of the proposed method is verified by comparing the results of the proposed method with those of other method.
Bridge Simulation System with Soil-Foundation-Structure Interaction
Kim, Ik-Hwan ; Han, Bong-Koo ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 168~178
The hybrid simulation test method is a versatile technique for evaluating the seismic performance of structures by seamlessly integrating both physical and numerical simulations of substructures into a single test mode. In this paper, a software framework that integrates computational and experimental simulation has been developed to simulate and test a bridge structural system under earthquake loading. Using hybrid simulation, the seismic response of complex bridge structural systems partitioned into multiple large-scale experimental and computational substructures at networked distributed experimental and computational facilities can be evaluated. In this paper, the examples of application are presented in terms of a bridge model with soil-foundation-structure interaction.
A Study on the Reliability of Detecting Reinforcement Embedded in Concrete in Various Factors Using Electromagnetic Induction Method and Electromagnetic Wave Method
Kim, Jong-Ho ; Oh, Kwang-Chin ; Park, Seung-Bum ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 179~186
Probing inside of concrete structures is one of the important steps in assessing condition of the structure. For the assessment, electromagnetic induction method and electromagnetic wave method are currently applied to the measurement of cover depth, and the detection of reinforcement embedded in concrete. To determine detection capability of locating reinforcement embedded in concrete, commercially available nondestructive testing (NDT) equipments have been tested. The equipments include electromagnetic wave system and electromagnetic induction system. In the tests, nine concrete specimens which have the dimensions of 1,000mm(length))
300mm(width) with thickness varying from 125mm to 150mm are used. The reinforcement are located at 45, 60, 100mm depth from the concrete surface. Horizontal reinforcement spacing has been set over 100mm. From the outcome, it is shown that error is increased as the diameter of reinforcement enlarge in case of using electromagnetic induction method. In case of using electromagnetic wave method, the detection of reinforcement embedded in deep is good in the view of reliability because of using the relative permittivity on the real cover depth.
Decision Making Model for Widening Bridges Using Decision Tree Technique
Cho, Hyo Nam ; Park, Jin-Hyung ; Sun, Jong-Wan ; Youn, Man-Keun ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 187~194
Recently, the constructions of widening bridges or new bridges are often undergoing as a part of road widening because traffic volumes are rapidly increasing caused by fast-growing population and urbanization. But in general, there is no rational decision process and specification to justify the validity of the bridge widening. Moreover, there are also numerous events including various uncertainties involved in widening bridges. In this paper, therefore, a decision making model is proposed for widening bridges using decision tree based on quantitative LCC analysis considering a variety of uncertainties for the rational and practical approach to a quantitative decision making for alternatives.
Probability Based Resistance Model of Steel Girder Bridges Based on Field Testing
Eom, Jun-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 12, issue 4, 2008, Pages 195~202
Underestimation of the capacity can have serious economic consequences, as deficient bridges must be posted, repaired or replaced. Accurate prediction of bridge behavior may allow for more bridges to remain in service with or without minor repairs. The presented research is focused on the reliability evaluation of the actual load carrying capacity of existing bridges based on the field testing. Reliability analysis is performed on 17 previously tested bridges. Bridges are first evaluated based on the code specified values and design resistance. However, after the field testing program, it is possible to apply the experimental results into the bridge reliability evaluation procedures. The girder distribution factors obtained from the tests are also applied in the reliability calculation. The results indicate that the reliability indices of selected bridges can be significantly increased due to the reduction of uncertainties without sacrificing the safety of structures, by including the result of field measurement data into calculation.