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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
Evaluation of Fire-induced Damage for Shield Tunnel Linings Subjected to High Temperatures
Lee, Chang Soo ; Kim, Yong Hyok ; Kim, Young Ook ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 1~8
DOI : 10.11112/jksmi.2012.16.4.001
The aim of this study is to evaluate fire-induced damage for shield tunnel linings. Full-scale fire test was conducted to evaluate fire-induced damage. Residual compressive strength was measured on the core samples of shield tunnel lining subjected to high temperatures. Heating temperature was predicted by XRD and TG analysis. As a result, Strength degradation of concrete with temperatures can be evaluated by residual compressive strength of core samples. In addition, residual compressive strength can be estimated by previous studies if heating temperature is exactly predicted. It is possible that heating temperature is predicted by XRD and TG analysis at
. For more accurate prediction of heating temperature it should be performed both instrumental analysis and analytical methods with temperatures ranging from
An Experimental Study on Allowable Compressive Stress at Prestress Transfer in Pre-Tensioned Concrete Members
Lee, Jeong Yeon ; Lee, Deuck Hang ; Kim, Kang Su ; Park, Min Kook ; Yoon, Sang Chun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 9~17
DOI : 10.11112/jksmi.2012.16.4.009
In the previous research, allowable compressive stress was analyzed based on strength theory, in which primary effect factors on the allowable compressive stress, such as eccentricity ratio, section type, section size, prestress and self-weight moment, were considered. As its results, allowable compressive stress equations were proposed. As a series of the previous research, this paper presents an experimental study on the prestress at transfer of pre-tensioned members with different eccentricity ratios. The results shows that ACI318-08 and EC2-02 are unconservative for the members under low eccentricity ratios, and they are conservative for the members under high eccentricity ratios. Compared to the code provisions, the results indicates that the proposed equation reasonably well evaluates the allowable compressive stresses for those with different eccentricity ratios.
A Study on Watertightness Improvement of Hybrid Method Using Polyvinyl Acetate(PVAc)
Ryou, Jae Suk ; Song, Il Hyun ; Lee, Yong Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 18~24
DOI : 10.11112/jksmi.2012.16.4.018
In this study, hybrid method using polyvinyl acetate (PVAc) which has a strong adhesion and flexibility in which acrylic copolymer chemical-reaction reacts with cement, and is eco-friendly, is to improve the watertightness. The hybrid method is applied applied primarily waterproof stuff comprising silicate system and secondary mortar mixed with PVAc on the concrete surface. And then, in order to evaluate the performance, the properties of bond strength and amount of water absorption were measured. Based on the above experiments, mock-up specimens for field application were fabricated, and then the properties were evaluated as laboratory experiments. As the results, specimens cast from hybrid method using PVAc showed the best results on watertightness and bond strength. And also, with respect to experiment of mock-up specimens, the properties were in agreement with laboratory results. Especially, it could know that PVAc has strengthening effect from the results of the compressive strength. Due to outstanding results of carbonation depth and resistance to chloride ion penetration, it may be applied in weak areas such as underground and marine structures.
Aging Deterioration for Electric Power Transmission Tower on Offshore Through Periodic Inspections
Lee, Ho Beom ; Jang, Il Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 25~33
DOI : 10.11112/jksmi.2012.16.4.025
In electric power transmission tower structures on offshore, implementation of life management using the event data of regular safety inspections for structural and material damages is strongly recommended. In this study, six tower structures in Sihwa Lake around Yeoungheung island were target bodies for the safety inspections. safety inspections for deterioration about each of six towers were performed about three items for steel member, five items for concrete foundation, and four items for steel-pipe pile in seawater and seawater itself. Safety inspections for steel members included the visual observations of surface appearances, the measurements of member thicknesses, and the checks of painting states. Also safety inspections for concrete foundations comprised the estimation of crack features, the evaluation of non-destructive compression strengths, and the measurements of neutralization depths and chlorides contents. For steel-pipe piles in seawater the inspections comprised the surveys of corrosion states in accordance with potential levels tests and anode tests, the analyses of photos taken on surfaces of the piles as well as the evaluation of seawater quality. A set of deterioration inspections was performed at the same positions around october of each year for three consecutive years. As a result in this study, Newly developed deterioration indexes have been applied profitably to maintain structural safety for electric power transmission towers by utilizing these event data systematically.
Negative Support Reactions of the Single Span Twin-Steel Box Girder Curved Bridges with Skew Angles
Park, Chang Min ; Lee, Hyung Joon ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 34~43
DOI : 10.11112/jksmi.2012.16.4.034
The behaviors of the curved bridges which has been constructed in the RAMP or Interchange are very complicate and different than orthogonal bridges according to the variations of radius of curvature, skew angle and spacing of shoes. Occasionally, the camber of girder and negative reactions can be occurred due to bending and torsional moment. In this study, the effects on the negative reaction in the curved bridge were investigated on the basis of design variables such as radius of curvature, skew angle, and spacing of shoes. For this study, the twin-steel box girder curved bridge with single span which is applicable for the RAMP bridges with span length(L) of 50.0m and width of 9.0m was chosen and the structural analysis to calculate the reactions was conducted using 3-dimensional equivalent grillage system. The value of negative reaction in curved bridges depends on the plan structures of bridges, the formations of structural systems, and the boundary conditions of bearing, so, radius of curvature, skew angle, and spacing of shoes among of design variables were chosen as the parameter and the load combination according to the design standard were considered. According to the results of numerical analysis, the negative reaction in curved bridge increased with an decrease of radius of curvature, skew angle, and spacing of shoes, respectively. Also, in case of skew angle of
the negative reaction has been always occurred without regard to
, and in case of skew angle of
the negative reaction hasn't been occurred in
below 0.27 with the radius of curvature of 180m and in
below 0.32 with the radius of curvature of 250m, and in case of skew angle of
the negative reaction hasn't been occurred in the radius of curvature over 180m and in
below 0.38 with the radius of curvature of 130m, The results from this study indicated that occurrence of negative reaction was related to design variables such as radius of curvature, skew angle, and spacing of shoes, and the problems with the stability including negative reaction will be expected to be solved as taken into consideration of the proper combinations of design variables in design of curved bridge.
Physical Properties of the Hardened Loess Using Natural Binding Materials
Kim, Jin Seok ; Oh, Young Hun ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 44~51
DOI : 10.11112/jksmi.2012.16.4.044
In this study, hardened loess bodies, which did not compose of cement or any chemical binder, were made and tested to evaluate the physical properties such as slump, air content, and compressive strength. Addition of a natural binding material to mixture of loess and lime showed better performance in physical properties. However a lime among natural binding materials is considered as a superior binder to improve the properties of the hardened bodies. According to the experimental results, mixing proportion with 45% of W/B ratio,
of water content, and 60% lime substitution ratio was recommended to acquire the good performance of physical properties for the hardened loess bodies.
Prediction of Failure Mode Under Static Loading in Long Span Bridge Deck Slabs by FEM
Park, Woo Jin ; Hwang, Hoon Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 52~59
DOI : 10.11112/jksmi.2012.16.4.052
An analytical model is presented to predict the static behavior of the long-span prestressed concrete bridge deck(the long-span PSC deck). The finite element analysis is performed and the results are compared with that of the previous experimental test. The load-deflection relationship curves by FEM are in good agreement with the results reported in the previous study. The failure mode of all test specimens is predicted by the punching shear in this study. It is also observed in the previous experimental test. The main objective of this paper is presenting supportive method to predict static behavior of the long-span PSC deck slab. It is not simulating the punching shear behavior graphically.
Free and Ambient Vibration of Steel-Deck Truss Bridge
Jung, Sung Yeop ; Oh, Soon Taek ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 60~68
DOI : 10.11112/jksmi.2012.16.4.060
This study describes an analytical and experimental investigation of the pedestrian steel-deck truss bridge in the City of Rochester, New York, U.S.A. This investigation was undertaken to provide assurance that this important bridge continues to be functional for this use. An ambient vibration experiment on full-scale structures is a way of assessing the reliability of the various assumptions employed in the mathematical models used in analysis. It is also the most reliable way of determining the structural parameters of major importance in structural dynamics, such as the mode shapes and the associated natural frequencies. Pedestrian-induced vibrations have been measured on the bridge to determine the displacement and the vertical and transverse dynamic characteristics of the steel deck truss. In the analytical modeling, three-dimensional finite element analysis was developed and validated against the ambient tests.
An Experimental Study on the Physical Property of Non-Vulcanized Waterproofing Synthetic Rubber Sheet for the Underground Concrete Wall
Choi, Eun Su ; Lee, Dae Woo ; Seo, Sang Kyo ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 69~78
DOI : 10.11112/jksmi.2012.16.4.069
This paper study on the physical property of naturally vulcanizing waterproofing synthetic rubber sheet for the underground concrete wall. In order to finding the naturally vulcanizing time, the relation of vulcanizing time and tensile strength is analysed from non-vulcanizing to naturally vulcanizing time. Physical tests such as tensile strength, tear strength: etc., under the thermal environment temperature at
. The result of experiment show that the developed rubber sheet has the delay time about 85 days and the curing time about 35 days. The tensile strength increased by about 692% and coefficient of expansion decreased by about 10% which value can be sufficiently compensate the demerit of vulcanized rubber sheet. Also, all of the physical properties of the naturally rubber sheet satisfy the KS standard and compare to the vulcanized rubber sheet, the developed naturally rubber sheet have excellent durability.
Evaluation on Stiffness of Mechanical Sleeve Bar Splice Filling High-strength Mortar Under Monotonic Loading
Kim, Hyong Kee ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 79~88
DOI : 10.11112/jksmi.2012.16.4.079
The purpose of this study is to evaluate the stiffness of the mechanical sleeve reinforcement splices filling high-strength mortar under monotonic loading. For this objective, we analyzed and compared the previous test data of 189 actual-sized mortar-filled sleeve bar splices specimens, including the reinforcing bar splices prepared and tested by the author. The paper results indicated that the minimum values of compressive strength of mortar(
) multiplied by the ratio of reinforcement development length to bar diameter(L/d) were suggested for holding the stiffness of the mortar-filled sleeve reinforcement splices required in AIJ code.
Confinement Effect of High-Strength Steel Spirals According to Compressive Strength of Concrete
Kim, Sang Woo ; Kim, Young Seek ; Yun, Gun Jin ; Lee, Jung Yoon ; Kim, Kil Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 89~98
DOI : 10.11112/jksmi.2012.16.4.089
This study estimates the performance of steel spirals according to the compressive strength of the concrete. A total of 24 confined concrete cylinders (
) were cast and tested under monotonic concentric compression. The main test parameters were the yield strength of spiral reinforcements and the compressive strength of the concrete. To effectively evaluate the confinement effect according to the yield strength of steel spirals, the external diameter of steel spirals was designed to be same as the diameter of specimen. The experimental results indicated that the performance of confinement of steel spirals increased as the yield strength of spiral reinforcement increased and the compressive strength of the concrete decreased. Furthermore, existing analytical models were used for predicting the stress versus axial strain relationships of specimens tested in this study. It can be concluded that the accuracy of the analytical models deteriorated as the yield strength of steel spirals and the compressive strength of the concrete increased.
An Estimation of the Temperature-dependent Thermal Conductivity for Hybrid-fiber Reinforced Shield Tunnel Lining
Lee, Chang Soo ; Kim, Yong Hyok ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 99~106
DOI : 10.11112/jksmi.2012.16.4.099
This study presents estimation method of temperature-dependent thermal conductivity by using solution of inverse heat conduction problem. Time and depth temperature distribution data from full-scale fire test were used for estimating temperature-dependent thermal conductivity on hybrid-fiber reinforced shield tunnel lining. At short heating time, estimated thermal conductivity sharply decreased within
. On the other hand, it reflected thermal properties of concrete and effect of steel fiber at heating time of measured maximum heating temperature. Thus arbitrary time should be determined to estimate temperature-dependent thermal conductivity in time zone of measured maximum heating temperature. Estimated temperature-dependent thermal conductivity is similar to results of other study.
A Proposal of Tensile Strength Prediction Models Considering Unit Weight of Concrete
Sim, Jae Il ; Yang, Keun Hyeok ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 107~115
DOI : 10.11112/jksmi.2012.16.4.107
The present study evaluates the validity of different equations specified in code provisions and proposed by the existing researchers to predict the concrete tensile capacities (direct tensile strength, splitting tensile strength and modulus of rupture) using a comprehensible database including 361 lightweight concrete (LWC), 1,335 normal-weight concrete (NWC) and 221 heavy-weight concrete (HWC) specimens. Most of the equations express the concrete tensile strengths as a function of its compressive strength based on the limited NWC concrete test data. However, the present database shows that the concrete tensile capacities are significantly affected by its unit weight as well. As a result, the inconsistency between experiments and predictions by the different models increases when the concrete unit weight is below 2,100 kg/
and concrete compressive strength is above 50 MPa. On the other hand, new models proposed by the present study considering the concrete unit weight predict the tensile strengths of concrete with more accuracy.
Estimation of Carbonation and Service Life of Box Culvert for Power Transmission Line
Woo, Sang Kyun ; Lee, Yun ; Yi, Seong Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 116~121
DOI : 10.11112/jksmi.2012.16.4.116
The construction of underground structures such as box culverts for electric power transmission is increasing more and more, and the life extension of these structures is very important. Carbonation-induced corrosion in concrete may often occur in a high carbon dioxide environment. In this study, the risk of carbonation of two concrete box culverts in an urban area was evaluated by measuring the carbonation rate and concrete cover depth. Then, the carbonation-free service life at the depth of the steel was calculated, based on in situ information, by the Monte Carlo simulation. The service life of box culvert due to carbonation was estimated over 250 years via Monte Carlo simulation.
Properties and Environmental Effects Estimation of Grout Using Set Accelerating Agent Made From Calcium Aluminate and Viscosity Agent
Heo, Hyung Seok ; Yi, Seong Tae ; Noh, Jae Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 16, issue 4, 2012, Pages 122~129
DOI : 10.11112/jksmi.2012.16.4.122
In this study, environmental problems(i.e., pH elevation and
detection) occurred by using the cement grout made from CA(calcium aluminate) were evaluated using viscosity agents(MC, chelate polymer). Ordinary portland cement and blaste-furnace slag cement were used by main materials and ACC(blended mixture of calcium aluminate) were used by accelerator for hardening of grout. In addition, viscosity agents were used for preventing pH elevation and heavy metal detection from grouting materials. From the results, it was noted that when chelate polymer was used, pH elevation and
detection were minimized. However, other cases showed higher pH elevation and
detection. At test 1 day,
detection with age presented over 97% of total value and, after that, additional increase was not distinct. As a result of this study, it was acknowledged that, to control pH elevation and heavy-metal (like
) detection, the usage of BSC and chelate polymer is a very useful fact.