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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
The Response Modification Factor of Inverted V-type Braced Steel Frames
Ahn, Hyung Joon ; Jin, Song Mei ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 1~9
DOI : 10.11112/jksmi.2013.17.1.001
In this study of Eccentric Braced Frames have identified the following target eccentricity on the length of the inelastic behavior of the reaction by calculating the correction factor by comparing it to the value suggested by the earthquake provided material for the rational design aims to There are. As a variable-length V-braced frame analysis model stations were set up. Eccentricity faults in the model according to the length stiffness ratio, the maximum amount of energy dissipation were analyzed base shear and multi-layered model of the reaction from the eccentricity correction factor calculated on the length of the building standards proposed by KBC 2009 in response eccentricity correction factor calculated from The length varies. does not have the same response modification factor was confirmed.
Durability Evaluation and Defect Pattern Analysis in Railway Bridge Through Field Investigation
Kwon, Seung Jun ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 10~20
DOI : 10.11112/jksmi.2013.17.1.010
Because of the defect in design, damage in using period, and deterioration in long term exposure to severe environmental condition, degradation of performance in RC (Reinforced Concrete) structures has occurred. This paper contains durability performance evaluation in railway bridges which covers eight districts through field investigation. For the target structures, durability performance is evaluated and the critical problems in use are derived. Additionally, service lifes for the deteriorated structures are evaluated through Durability-Environment index method based on the results from field investigation, and the results are compared with those from the condition assuming the structures without defect, damage, and deterioration. The target structures which consist of RC T girder, PSC girder, RC box, and Rahmen are investigated and the critical damage patterns are derived. They are evaluated to be cracks in PSC girder end, flexural cracks in PSC girder, crack around EPT anchor, and flexural cracks in RC T girder and RC box. The reasons for the critical patterns are also investigated. This study can be utilized for the repair planning considering the different district and the structure types.
Analysis of Soil Saturation Characteristics According to the Presence or Absence of Soil Layer Depth and Impervious
Lee, Seung Woo ; Chang, Bhum Soo ; Kim, Yong Soo ; Lee, Jong Gun ; Lee, Ju Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 21~26
DOI : 10.11112/jksmi.2013.17.1.021
In recent study, infiltration analysis considering rainfall intensity is more economical and practical than existing analysis method. Revised construction slope design standard is also stated to full-fill infiltration analysis considering rainfall for practical stability review. Infiltration analysis considering rainfall for practical stability review. But, to infiltration analysis, the process is complicated by ground impermeability and rainfall intensity. In this study, we perform infiltration analysis to charge infiltration conditions, soil type and rainfall characteristics, for more pratical stability review. Using the result, we can suggest construable condition on the assumption that soil is saturated up to surface zone.
Application of Isolation System to the Lighthouse Structure
Hur, Moo Won ; Chun, Young Soo ; Kim, Dong Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 27~36
DOI : 10.11112/jksmi.2013.17.1.027
In this study, seismic isolation technology to the lighthouse structure is suggested and isolation effects on response reduction are studied for three types of isolation models with the proposed seismic isolation technology. A seismic isolation system is installed on the base of the lighthouse structure in model 1, on the base of the lighthouse lens in model 2, and on the base of both of them in model 3. The dynamic time history analysis verifies that in case of model 1, the earthquake loading is greatly reduced and the accelerations of superstructure are greatly reduced. Also, the inter-story drifts are very small and can be neglected. The isolated model is in translational state and can be seen as a rigid whole. as a results, model 1 is very effective to mitigate the influence of earthquake on structures. In model 2, isolation effects are valid but special care should be taken to failure of the non-isolated lighthouse sub-structure. In model 3, isolation effects are also valid but the effects are small. model 3 is less effective than model 1.
Evaluating Local Damages and Blast Resistance of RC Slabs Subjected to Contact Detonation
Li, Ling ; Lee, Jin Young ; Min, Kyung Hwan ; Yoon, Young Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 37~45
DOI : 10.11112/jksmi.2013.17.1.037
In this study, the resistance of various reinforced concrete (RC) slabs subjected to contact detonation was assessed. In order to enhance the blast resistance, fibers and external FRP sheets were reinforced to RC slabs. In the experiment, the
sized RC slabs were fabricated using normal concrete (NC), steel fiber reinforced concrete (SFRC), polyvinyl alcohol fiber reinforced cementitious composite (PVA FRCC), and ultra-high performance cementitious composites (UHPCC). The damage levels of RC slabs subjected to contact detonation were evaluated by measuring the diameter and depth of crater, spall and breach. The experimental results were compared to the analyzed data using LS-DYNA program and three different prediction equations. The diameter and depth of crater, spall and breach were able to be predicted using LS-DYNA program approximately. The damage process of RC slabs under blast load was also well expressed. Three prediction equations suggested by other researchers had limitations to apply in terms of empirical approaches, therefore it needs further research to set more analytical considerations.
Tensile Stress-Crack Opening Relationship of Ultra High Performance Cementitious Composites(UHPCC) Used for Bridge Decks
Kwon, Seung Hee ; Lee, Seung Kook ; Park, Sung Yong ; Cho, Keun Hee ; Cho, Jeong Rae ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 46~54
DOI : 10.11112/jksmi.2013.17.1.046
Two different UHPCCs having different fiber lengths and volume fractions are considered to be applied to bridge decks. The objective of this study is to estimate cracking resistance of the two UHPCCs. The notched beam tests were performed with the UHPCCs, and the relationships between load and CMOD(Crack Mouth Opening Displacement) were obtained from the tests. The tensile stress and crack opening relationships optimally fitting the measured load-CMOD curves were found through the inverse analyses. The UHPCC with 2% volume fraction of 13 mm long fiber has lower fracture energy than the UHPCC with 0.5% and 1.0% volume fractions of 16.3 mm and 19.5 mm long fibers, respectively. It indicates that the latter UHPCC is more effective in uniformly distributing crack formation and reducing crack width.
Seismic Performance Evaluation of Nonseismic Neighborhood Living Facilities Considering Deterioration
Lee, Young Cheon ; Jeoung, Chae Myeoung ; Lee, Eun Jin ; Kim, Myung Hoon ; Choi, Ki Bong ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 55~63
DOI : 10.11112/jksmi.2013.17.1.055
In this study, seismic performance was evaluated considering the deterioration level for the low-rise and moderate buildings with non-seismic details which are most common in Korea. Evaluation results showed that the deterioration condition is relatively good even after 24 years of construction but the seismic performance did not satisfy the protection index in the first and second evaluation. In case of the third evaluation, the goal performance was satisfied based on the interstory drift ratio but reinforcement is found to be necessary. Seismic performance was evaluated after the target buildings were reinforced in the walls, bracing, and damper. Results showed the interstory drift ratio drastically reduced regardless of reinforcement methods and satisfied the level of immediate occupancy. In case of wall reinforcement, however, base shear increased more than double which requires review on the existing foundation.
Development of Maintenance Simulation System and Prediction of Chloride Ion Permeation for Marine Concrete Structures
Lee, Chang Su ; Kim, Meyong Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 64~75
DOI : 10.11112/jksmi.2013.17.1.064
As both laboratory accelerated experiment and field exposure experiment were performed, at recent, the fifth field test at five year exposures was proceeded according to long period experimental plan. Field experiment, for the adoption of the developed evaluation model, which is consisted of the analysis of chloride penetration profile at gate bridges of sea-dike completed 30 years ago was carried out during upgrading the basic evaluation model with analyzing the annual field test data. The surface concentration of chlorides was replaced to the concentration of chloride of inner concrete near the surface chlorides among his research results at basic model. Maage's suggestion function was accepted too as a diffusion coefficient of chloride after verifying the change of diffusion coefficient by analysis of annual field test data. The comparison of field data with model predictions and the estimation of remaining life time demonstrates that the proposed updated model and maintenance simulation system can be used to predict the chloride penetration profile in the marine tidal zone and appropriate repair period and cost.
Effect of Types of Accelerators and Replacement Levels of GGBFS on the Performance of Shotcrete Mortars
Lee, Seung Tae ; Kim, Seong Soo ; Kim, Dong Gyu ; Park, Kwang Pil ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 76~84
DOI : 10.11112/jksmi.2013.17.1.076
In this study, some engineering properties of OPC and GGBFS shotcrete mortars with alkali-free or aluminate accelerator were experimentally examined. As a result, GGBFS mortars with alkali-free accelerator were significantly similar to OPC mortars with same accelerator with respect to both setting time and compressive strength. Comparatively, GGBFS mortars with aluminate accelerator showed a good performance with an increased replacement of GGBFS. Furthermore, when replaced with GGBFS over 50%, the mortars exhibited superior performances of electrical resistivity and chloride ions penetration resistance. Accordingly, it is suggested that GGBFS has a beneficial effect as shotcreting materials in the condition of proper replacement levels.
Evaluation on Stiffness of High-strength Mortar-filled Sleeve Bar Splice Under Cyclic Loading
Kim, Hyong Kee ; Chung, Goo Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 85~93
DOI : 10.11112/jksmi.2013.17.1.085
In order to make a more reasonable evaluation on the stiffness of the high-strength mortar-filled sleeve bar splices under cyclic loading, we investigated and analyzed the existing experiment data of 106 full-sized reinforcing bar splices with test variables such as compressive strength of mortar, development length of reinforcement and sleeve type, etc. The following were found: 1) If mortar and the reinforcement development length with
(L/d) of more than 340 is used, the cast iron sleeve bar splices for SD350 and SD400 will have the stiffness of higher than A class of the AIJ code. 2) If mortar and the reinforcement development length with
(L/d) of more than 400 is used, the cast iron sleeve splices and pipe sleeve splices for SD500 will have the stiffness of higher than A class of the AIJ code.
A Study on the Characteristics of Dynamic Behaviors for Continuous PSC Girder Bridges with Integral Pier Cap
Jeong, Young Do ; Koo, Min Se ; Yi, Seong Tae ; Kim, Hee Sung ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 94~105
DOI : 10.11112/jksmi.2013.17.1.094
Recently, the construction industry has been changed in such a way that the cost for bridge construction should be optimized or reduced. Therefore, bridges are required be cost-effective in terms of initial construction as well as in the maintenance during service stage. In order to reduce the cost for bridge construction, the Rahmen typed structure, in which the bridge components from superstructure to substructure are integral, has many advantages to reduce the size of structural members including girders, since the loadings from superstructure may be transferred to substructure through the connecting rebars such as stud, etc. This paper studied on the continuous Up and Down Prestressed Concrete (UD PSC) girder bridge in which the reinforced concrete pier cap is integral with the part of girders in superstructure. In previous studies, it is known that the structural behavior of continuous UD PSC girder bridge is quite different compared to the one of the bridges with conventional bearings or shoes to support the loading from girders. Nevertheless, it has hardly been studied about the structural behavior of bridge with UD PSC girder. Therefore, in this study, various dynamic behaviors of continuous UD PSC girder bridge with integral pier cap have been analyzed using numerical method. Furthermore, an equation to evaluate the impact factor is suggested for the UD PSC girder bridge which has two to three continuous spans.
Effect of Steel Fiber Distribution in Steel Fiber-reinforced Concrete on Surface Electrical Resistivity
Kim, Seong Do ; Moon, Do Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 106~113
DOI : 10.11112/jksmi.2013.17.1.106
One of feasible non-destructivity test methods for evaluation of concrete permeability is the measurement of surface resistivity. But the application to steel fiber-reinforced concrete has been limited because mis-evaluation could be caused by the steel fibers in concrete. In this study, the effect of fiber distribution on surface electrical resistivity of steel fiber-reinforced concrete was investigated through experimental program. Resistivity was measured three times on four surfaces in three rectangular and circular specimens with 0.5%, 1% and 1.5% steel fibers by volume and compared each other. The results obtained from circular specimens were consistent compared to those from rectangular specimens. And the results demonstrated that the effect of fiber distribution on surface resistivity was not significant compared to that of mixing ratio of steel fibers. In conclusion, this non-destructive testing method using measurement of surface resistivity could be used for SFRC within 0.5% steel fibers by volume.
Structural Performance Evaluation of Recycled PET Fiber Reinforced RC Slab
Kim, Sung Bae ; Kim, Jang Ho Jay ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 114~123
DOI : 10.11112/jksmi.2013.17.1.114
This study was performed to verify the structural reinforcing effect of recycled polyethylene terephthalate (PET) fiber. In order to verify the structural reinforcing capacity of RPET fiber, recycled PET fiber added RC slab specimens were prepared to examine the flexural capacity while those of plain concrete and those of added with PP fiber, and the behavior of the specimens were also evaluated. The result shows that the compressive strength reduces as the fiber volume fraction increases, and the rate of reduction varies from 2% to 7%. The result of the flexural capacity shows that the ultimate capacity of plain specimens is the highest compare to those fiber reinforced specimens, but it has shown that specimens reinforced by 5% PET fiber has the highest energy absorption and the ductility index. In the application of PET fiber in slab specimens has shown that ductility capacity have increased where the ultimate capacity decreasing. That is the different tendency of beam specimens, which the ultimate capacity and the ductility of those have both shown the improvement compare to plain concrete specimens, which means the reinforcing effect of PET fiber in slab is less strong than in beam. Therefore, the application of PET fiber in slab structures as reinforcement needs the proper mix proportion of concrete and volume fraction of PET fiber with deep consideration of the structures.
Damage Location Detection of Shear Building Structures Using Mode Shape
Yoo, Suk Hyeong ; Lee, Hong Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 124~132
DOI : 10.11112/jksmi.2013.17.1.124
Damage location and extent could be detected by the inverse analysis on dynamic response of the damaged structure. In general, detection of damage location is possible by the observation of the mode shape difference between undamaged and damaged structure and assessment of stiffness reduction is possible by the observation of the natural frequency difference of them. The study on damage detection by the dynamic response in civil structures is reported enough and in practical use, but in building structures it is reported seldom due to several problems. The purpose of this study is to present the damage detection method on shear building structures by mode shape. The damage location index using 1st mode shape is observed theoretically to find out damage location. The damage detection method is applied to numerical analysis model such as MATLAB and MIDAS GENw for the verification. Finally the shaking table test on 3 story shear building is performed for the examination of the damage detection method. In shaking table results, as the story stiffness decrease by 25% the 1st mode frequency increase by 12%, and the damage location index represents minus at damaged story.
Evaluation of Seismic Performances on Prestressed Composite Coupling Beams with Discontinuous Webs
Oh, Jae Yuel ; Lee, Deuck Hang ; Choi, Seung Ho ; Kim, Kang Su ; Yi, Seong Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 1, 2013, Pages 133~142
DOI : 10.11112/jksmi.2013.17.1.133
The shear wall system with coupling beams has been known as an effective means for moderate and high rise buildings up to 40 stories, because this structural system can provide the enhanced lateral stiffness compared to individual shear walls. Typical reinforced concrete coupling beams have difficulties in construction due to complicated reinforcing work on site, and steel coupling beams also have disadvantages in economical point of view because of a large number of stiffeners required for its stability under lateral loading. To overcome these disadvantages in existing coupling beam systems, this study developed the prestressed composite coupling beam with discontinuous webs, which have improved constructability, economic feasibility, and reduced sectional size. The reversed cyclic loading test on two prestressed composite coupling beams with discontinuous webs having different shear reinforcement ratios have been conducted to investigate their structural performances, and test results showed that the proposed composite coupling beams had good seismic performances.