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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 13, Issue 6 - Nov 2009
Volume 13, Issue 5 - Sep 2009
Volume 13, Issue 4 - Jul 2009
Volume 13, Issue 3 - May 2009
Volume 13, Issue 2 - Mar 2009
Volume 13, Issue 1 - Jan 2009
Selecting the target year
Application of Nano-TDR Health Monitoring System in Civil Engineering
Han, Heui-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 93~100
This study presents reasonable relationships to estimate the deformation based on beam mechanism analysis and TDR(Time Domain Reflectometry) data. To declar the length points of co-axial cable installed in civil structure, Nano material (
powders and silver mixture) is used on co-axial cables. From the laboratory test, nano material could make the correct information about attached cable points on beam, and TDR sensor system and Fourier series (data filter) found out the deformation of beam. Therefore it is concluded that the correct deformed information of beam were acquired by Nano-TDR and Fourier filter, they are much more effective to apply at health monitoring system in civil structure compared to conventional TDR or Fiber Optic Sensor (FOS) systems.
Inspection of Structural Elements Using NDE
Shim, Hyung-Seop ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 101~108
Mathematical basis of interpretation of data from nondestructive evaluation (NDE) methods in condition assessment of structures is presented. In structural inspection with NDE methods, NDE data are not directly used for the condition assessment. Instead, NDE data must be interpreted as condition of inspected element. Correct assessments of conditions depend on many factors such as the inaccuracy and the variability in NDE measurements and the uncertainty in correlation between attributes (what is measured) and conditions (what is sought in the inspection). A full description of the performance of NDE methods considers the relation of test data to conditions of elements. The quality of the test itself is important, but equally important is the interpretation that occurs after the test. The effects of variability in test data and uncertainty in correlations of attributes and conditions are presented in three examples of field testing methods.
Evaluation on the Lost Prestressing Force of an External Tendon Using the Combination of FEM and HGA: I. Theory
Park, Taehyo ; Jang, Hang-Teak ; Noh, Myung-Hyun ; Park, Kyu-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 109~120
This paper introduces a new method to estimate the loss of prestressing force for the externally prestressing tendon. The proposed method that combines of HGA and FEM is able to identify the lost tensile force of a externally prestressed tendon. The identification variables of the proposed method is a exteranlly prestressed tendon of tension, effective nominal diameter, mass per unit length and Rayleigh damping coefficients. First of all, a finite element model system is constructed to consider the effect of damping, and these variables are identified using inverse analysis technique - updating algorithm. Finally, throughout total 3 cases of numerical tests, the numerical propriety of the proposed method is verified. Here, it is seen that the errors in the estimated variables by the proposed method are about 1% except in the case of Rayleigh damping coefficients.
Evaluation on the Lost Prestressing Force of an External Tendon Using the Combination of FEM and HGA: II. Experimental Verification and Field Applications
Jang, Hang-Teak ; Noh, Myung-Hyun ; Park, Kyu-Sik ; Park, Taehyo ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 121~132
This paper introduces an experimental verification and a field application of the proposed technique using the combination of FEM and HGA about the loss prestressing force of an exteranl tendon by above same authors. The vibration tests have been conducted by using a laboratory models and the externally prestressed tendon at the field and the natural frequencies are extracted from the vibration tests. The proposed technique based on the extracted natural frequencies is applied. It is seen that the errors in the tension and lost prestressing force by proposed technique are about 4% from a laboratory model test. For the model verification at field, exact modeling has beem made with Rayleigh damping. It is seen that the error in the tension by proposed technique is less than 1% and the estimated lost prestressing force converges less than the exact value.
An Experimental Study on the Physical Property of Lime Mortar in the Building' Masonry
Kwon, Ki-Hyuk ; Yu, Hye-Ran ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 133~141
50 year-old masonry buildings which had been constructed using lime mortar have caused lots of problems because of using different material, cement mortar, when they repair them. Also, there is little information on structural capacities and details of masonry buildings built using lime mortar. In addition, it is difficult to evaluate the structural capacities of the buildings which were often constructed by untrained labors. To preserve the original masonry construction, the study on their construction materials and methodologies has to be carried out. This paper provides basic information for establishing standard details of masonry works using lime mortar in order to overcome these problems when cultural properties are repaired or retrofitted. To do this, compression tests of lime mortar were preformed with the parameters of mixing ratios, mixing material, curing time and curing conditions etc. Based on the test results, the differences between lime mortar and cement mortar were specified and the structural characteristics of lime mortar were also presented in this paper.
Analysis of Failure Behavior of the Box Culvert with 3-Axes Loading System
Woo, Sang-Kyun ; Kwon, Yong-Gil ; Cho, Jun-Hyong ; Han, Sang-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 142~148
This paper is to investigate the fracture behavior characteristics of box culvert and incremental crack width of upper slab for the incremental loading by the 3-axis loading system. In the 3-axes loading system, loading directions are upper side, left and right side which simulate earth pressure and static traffic load. With the incremental load, crack patterns is investigated on the upper slab, left and right wall. Especially, on the upper slab, crack width is measured by crack gage. Based on the experimental results, structural internal force indices of box culvert are estimated quantitatively.
Seismic Safety Evaluation of Korean R/C School Buildings Built in the 1980s
Lee, Kang-Seok ; Wi, Jeong-Du ; Kim, Yong-In ; Lee, Hyun-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 149~159
The main purpose of this study is to evaluate the seismic safety of Korean R/C school buildings built in the 1980s, based on "the Japanese Standard for Evaluation of Seismic Capacity of Existing R/C Buildings", the nonlinear static and the nonlinear dynamic analyses. The evaluation result of the Japanese Standard showed that R/C school buildings built in the 1980s have 0.2 through 0.4 of seismic indices(
). This result indicates that more than medium damage could be potentially occurred under a medium intensity level of ground motion(150g). The results of the nonlinear analyses and the post-earthquake damage evaluation method showed that Korean R/C school buildings can be suffered moderate and severe damages under a 150gal and a 200gal intensity levels of ground motions, respectively. These results reveal that R/C school buildings should be urgently required a actual earthquake preparedness measures including seismic strengthening for future earthquake.
Experimental Study on the Penetration Depth and Concentration of Corrosion Inhibitor Using Press-in Method Into the Inside of Concrete
Cho, Hyeong-Kyu ; Yoo, Jo-Hyeong ; Lee, Han-Seung ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 160~168
After steel bar was corroded it removes concrete contaminated, it does steel bar corrosion protection, repairing method and corrosion inhibitor spreading method are difficult to secure corrosion protection performance. Accordingly, in this research before Research and Development to penetrate corrosion inhibitor to high pressure by steel bar position, it measures penetration depth through corrosion inhibitor high pressure penetration experiment and amount of nitrite by position and then it predicts penetration depth in accordance with water-cement ratio, pressure, pressure time and it computed water-cement ratio, pressure, pressure time to be more than 0.6 mol ratio of chloride ion and nitrite to have outstanding corrosion protection performance. As a result of experiment, water-cement ratio gives the biggest influence to penetration of corrosion inhibitor and also the more depth of specimen becomes deep, concentration of penetrated corrosion inhibitor does not equal and becomes low.
The Efficiency of External Heat Sources for Infrared Thermography Applied Concrete Structures and the Improvement of the Defect-identification
Sim, Jun-Gi ; Moon, Do-Young ; Chung, Lan ; Lee, Jong-Seh ; Zi, Goangseup ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 5, 2009, Pages 169~179
The purpose of this paper is to find an efficient heat source to amplify the surface temperature of damaged concrete structures for infrared thermography. we compare two different heat sources of far-infrared lamp and halogen lamp each other for their efficiency. The two heat sources were applied to the concrete specimens. Two different concrete specimens were used: one was the concrete containing internal void and the other was wrapped with partially unbonded fiber reinforced polymer sheet. it was found that the far-infrared lamp was more efficient than the halogen lamp. In addition, we propose a new algorithm to make the damage zone displayed clear in the image obtained from the thermographic operation. The algorithm is a combination of Gauss filtering process and the Prewitt mask operation.