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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
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Studies on Probabilistic Nonlinear First Ply Failure Loads and Buckling Loads of Laminated Composite Panels
Bang, Je-Sung ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 1~10
DOI : 10.11112/jksmi.2013.17.6.001
Probabilistic nonlinear first ply failure loads of flat composite panels and nonlinear buckling loads of curved composite panels with cutouts are estimated to provide the more reliable main load carrying structure in the renewable energy industry and offshore structures. The response surface method approximates limit state surface to a second order polynomial form of random variables with the results of deterministic finite element analyses at given sampling design points. Furthermore, the iterative linear interpolation scheme is used to obtain a more accurate approximation of the limit state surface near the most probable failure point (MPFP). The advanced first order second moment method and the Monte Carlo method are performed on an approximated limit state surface to evaluate the probability of failure. Finally, the sensitivity of the reliability index with respect to transformed random variables is investigated to figure out the main random variables that have an effect on failures.
Quantitative Damage Index of RC Columns with Non-seismic Details
Kim, Kyung-Min ; Oh, Sang-Hoon ; Choi, Kwang-Yong ; Lee, Jung-Han ; Park, Byung-Cheol ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 11~20
DOI : 10.11112/jksmi.2013.17.6.011
In this paper, the quantitative damage index for reinforced concrete (RC) columns with non-seismic details were presented. They are necessary to carry out the postearthquake safety evaluation of RC buildings under 5 stories without seismic details. The static cyclic test of the RC frame sub-assemblage that was an one span and actual-sized was first conducted. The specimen collapsed by the shear failure after flexural yielding of a column, lots of cracks on the surfaces of columns and beam-column joints and the cover concrete splitting at the bottom of columns occurred. The damage levels of these kinds of columns with non-seismic details were classified to five based on the load-displacement relationship by the test result. The residual story drift ratios and crack widths were then adapted as the quantitative index to evaluate the damage limit states because those values were comparatively easy to measure right after earthquakes. The highest one among the residual story drift ratios under the similar maximum story drift ratio decided on the residual story drift ratio of each damage limit state. On the other hand, the lowest and average ones among the respective residual shear and flexural widths under the similar maximum story drift ratio decided on the residual shear and flexural widths of each damage limit state, respectively. These values for each damage limit state resulted in being smaller than those by the international damage evaluation guidelines that are for seismically designed members under the same deformations.
An Experimental Study on Seismic Performance Evaluation of Retrofitted Column of FRP Seismic Reinforcement that can be Emergency Construction
Kim, Jin-Sup ; Kwon, Min-Ho ; Seo, Hyun-Su ; Lim, Jeong-Hee ; Kim, Dong-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 21~30
DOI : 10.11112/jksmi.2013.17.6.021
As increasing number of large-size earthquake, the social interest of seismic retrofitting of RC structure is growing. Especially, the RC columns that are not reflected seismic design can not resist lateral loads by the earthquake. The brittle fracture of Non-seismic designed columns lead to full collapse of the building. Thus, the emergency columns reinforcement method is needed. That have a fast construction time, do not cause damage to the column. In the past, cross-sectional expansion method, a steel plate reinforcing method is applied mainly, but in recent years, carbon fiber sheet taking advantage of FRP (Fiber Reinforced Polymer) is widely used. In this study, retrofitting effect of seismic performance of FRP seismic reinforcement, which is possible to emergency construction, was examined. Reinforced concrete specimens were constructed to experimental study. The seismic performence of specimes retrifitted with FRP seismic reinforcement were evaluated. As a result, the seismic performance of specimen reinforced with FRP seismic reinforcement has been improved.
Analysis of High Strength Concrete RC Beams with Tensile Resistance Subjected to Torsion
Han, Sam-Heui ; Kim, Jong-Gil ; Park, Chang-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 31~39
DOI : 10.11112/jksmi.2013.17.6.031
The ultimate behavior of high-strength concrete beams is studied with respect to their strength. Thirteen beams were analyzed and the results are presented herein. The variable parameters were the concrete`s compressive strength, from 57 to 184 MPa and the amount of lateral torsional reinforcement, from 0.35 to 1.49%. The ultimate torsional strengths from tests were compared with those by this proposed theory and by the ACI code. As a consequence, The ultimate torsional strengths by this proposed theory show the better results than those by the ACI code.
Effect of Cap Truss on Optimal Outrigger Location in Tall Building
Kim, Hyong-Kee ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 40~49
DOI : 10.11112/jksmi.2013.17.6.040
This study purposed to investigate the optimal outrigger location in tall building with cap truss after a structural schematic design of 80 stories building was performed by using MIDAS-Gen. In this paper, the main parameters of structural analysis were the outrigger location and stiffness of main structural elements (outrigger, exterior column, shear wall etc). In order to search the optimal outrigger position in high-rise building with cap truss, we analysed and examined the lateral displacement of top floor which is one of the very important considering factors of tall building structural design. The paper results indicated that the outrigger location and the stiffness of main structural elements such as outrigger, exterior column and shear wall had an effect on the optimal outrigger location. And it is verified that the study results provided the basic engineering data for fixing the most optimal outrigger location for minimizing the lateral displacement of tall building.
Dynamic Response of Steel Plate Girder Bridges by the KL-510 Load
Chung, Tae-Ju ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 50~60
DOI : 10.11112/jksmi.2013.17.6.050
Dynamic response of steel plate girder bridges by KL-510 design truck in KHBDC considering the road surface roughness of bridges and bridge-vehicle interaction is investigated. Simply supported steel plate girder bridges with span length of 20m, 30m, and 40m from "Standard Highway Bridge Superstructure" published by the Korean Ministry of Construction are used for a bridge model, and ten sets of the road surface roughness of bridge deck are generated from power spectral density (PSD) function by assuming the roadway as "Average Road". A three dimensionally modeled 5-axle tractor-trailer with its gross weight, which is the same as that of KL-510 design truck, is used for dynamic analysis. For the finite element modeling of superstructure, beam element for the main girder, shell element for the concrete deck, and rigid link between main girder and concrete deck are used. Impact factor and DLA of steel plate girder bridges for different span are calculated by the proposed numerical analysis model and compared with those specified by several bridge codes.
Characteristics and Dynamic Modeling of MR Damper for Semi-active Vibration Control
Heo, Gwang-Hee ; Jeon, Seung-Gon ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 61~69
DOI : 10.11112/jksmi.2013.17.6.061
This research is aimed to evaluate characteristics and dynamic modeling of MR damper for semi-active vibration control. A MR damper of semi-active type was designed and made for the purpose of controlling the vibration of a real-size model structure. Usually a semi-active control system equipped with a MR damper requires a dynamic model which expresses numerical data about the damping capacity and dynamic characteristics generated by a MR damper. To fulfil the requirement, a Power model and a Bingham model were particularly employed among many dynamic models of MR damper. Those models being contrasted with other ones, a dynamic test was carried out on the developed MR damper. In the test, excitation frequencies were conditioned to be 0.15 Hz, 1.0 Hz, and 2.0 Hz, and three different currents were adopted for each frequency. From these test results, it was found that displacement affected control capacity of the MR damper. The test results led to the identification of model variables for each dynamic model, on the basis of which a force-speed relation curve and expected damping force were derived and contrasted to those of the developed MR damper. Therefore, it was proven that the MR damper designed and made in this research was effective as a semi-active controller, and also that displacement of 2mm at minimum was found to be secured for vibration control, through the test using various displacements.
Traffic Induced Dynamic Load Factors on Continuous Steel Girder Bridges Based on Field Testing
Eom, Jun-Sik ; Choi, Jong-Dae ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 70~76
DOI : 10.11112/jksmi.2013.17.6.070
The objective of the paper is to present the results of analytical and experimental studies dealing with dynamic load for continuous steel girder bridges due to normal truck traffic. Various bridge design codes specify dynamic load factor (defined as a fraction of static portion of live load) for short span structures at the level of about 0.3. However, there are not definite values specified for continuous brigdes. Therefore, it is an usual practice to use the code specified dynamic load factors for simple span bridges to continuous bridges without clear background. The field measurement results indicate that the actual dynamic load factors are less than 0.2 for a single truck, and less than 0.05 for two trucks side-by-side, regardless of positive and negative moment region.
Evaluation of Effective Temperature for Estimate Design Thermal Loads in Steel Deck of Steel Box Girder Bridges
Shin, Dong-Wook ; Kim, Kyoung-Nam ; Choi, Chul-Ho ; Lee, Seong-Haeng ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 77~87
DOI : 10.11112/jksmi.2013.17.6.077
A present LSD (limited state design) code for temperature load in the domestic bridge design has applied a uniform standard for various bridge types. In this study, in order to calculate the effective temperature, a specimen of steel box girder bridge section with real size dimension was manufactured. For a year, the temperature data were measured at the 18 point in steel deck of steel box girder bridges specimen. Effective temperature within the cross section according to atmospheric temperature was calculated by this experiment data. The analyzed results were very similar correlation when compared with the effective temperature of the Euro Code. Therefore, the effective temperature which calculated based on the present data could be used as the basic data in order to present to the appropriate design criteria for the thermal loads on the domestic bridge design.
Binding of the Hexavalent Chromium Ions in the Process of Cement Hydration
Jung, Min-Sun ; Hwang, Jun-Pil ; Hong, Sung-In ; Ann, Ki-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 88~94
DOI : 10.11112/jksmi.2013.17.6.088
The hexavalent chromium (Cr(VI)) is well known as a hazardous ion, presumably inducing dermatic diseases and if serious cancer. The present study concerns the binding capacity of Cr(VI) ions in the cement powder and matrix for a quantitative technique of Cr(VI) ions in cement to influence human health. Both the water-soluble and acid-soluble Cr(VI) ions present in 3 types of ordinary Portland cement (OPC), pulverised fuel ash (PFA), ground granulated blast furnace slag (GGBS), and silica fume (SF) were measured using the spectrophotometer. As a result, it was found that the concentration of water-soluble Cr(VI) ion in cement ranged from 10.5 to 18.9mg/kg-cement, and in the additional materials a very low value of Cr(VI) ion was measured. Acid-soluble Cr(VI) ion was even higher than water-soluble Cr(VI) ion, ranging from 172.4 to 318.2mg/kg-cement. Nevertheless, the concentration of acid-soluble Cr(VI) ion is not proportional to addition of acid. It depends rather the variable pH of solvent involving cement paste. As enough cement hydration occurs, the binding capacity of Cr(VI) ion increases, inhibiting this ions from leaching out in the presence of hydration products such as ettringite or tri-calcium aluminate which bind Cr(VI) ion by ion-exchange.
Variation of Half Cell Potential Measurement in Concrete with Different Properties and Anti-Corrosive Condition
Kim, Ki-Bum ; Park, Ki-Tae ; Kwon, Seung-Jun ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 95~103
DOI : 10.11112/jksmi.2013.17.6.095
Half Cell Potential (HPC) technique has been widely adopted for its quantitative evaluation of corrosion possibility. In this study, RC specimens with three different cover depths (10mm, 30mm, and 60mm) and w/c ratios (0.35, 0.55, and 0.70) are prepared and accelerated salt spray test (SST) is performed for 45 days. Steel corrosion occurs in the specimens with 0.55 of w/c and 10mm of cover depth. In the case of 0.70 of w/c and 30mm of cover depth, steel corrosion is also monitored. Considering the effect of cover depth and w/c ratio, HCP evaluation equation is proposed and the condition which can control steel corrosion is obtained. Furthermore, anti-corrosive conditions containing w/c ratio and cover depth are analyzed through Life 365 program and the conditions are compared with the results from this study.
Modeling on Chloride Diffusivity in Concrete with Isotropic and Anisotropic Crack
Lee, Hack-Soo ; Bae, Sang-Woon ; Kwon, Seung-Jun ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 104~111
DOI : 10.11112/jksmi.2013.17.6.104
Deterioration is accelerated due to additional intrusion of chloride ion in crack width in cracked concrete. In this paper, modeling on equivalent diffusion coefficient in cracked concrete is performed for 1-D (Anisotropic) and 2-D (Isotropic) diffusion based on steady state condition. In the previous research, rectangular shape of crack was considered but the shape was modified to wedge shape with torturity. For verification of the proposed model, crack is induced in concrete sample and migration test in steady state is performed for 1-D diffusion. For 2-D diffusion, previous test results are adopted for verification. Through considering wedge shape of crack with torturity, diffusion coefficients in 1-D and 2-D diffusion are reduced, and the more reasonable prediction is obtained. The results from the proposed model with torturity of 0.10~0.15 are shown to be in the best agreement with the test results.
Bond Characteristic Between Lightweight Concrete and GFRP Bar
Son, Byung-Lak ; Kim, Myung-Sik ; Kim, Chung-Ho ; Jang, Heui-Suk ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 112~121
DOI : 10.11112/jksmi.2013.17.6.112
FRP reinforced lightweight concrete structures can offer corrosion resistance and weight reduction effect simultaneously, so practical use of the structures may be expected afterwards. But to make concrete structures using lightweight concrete and FRP bar, that can resist external forces without internal slip of the FRP bar, it is very important to understand bond characteristic between lightweight concrete and FRP bar. During that time, a lot of studies for bond behaviors of FRP bar in normal concrete were conducted, but studies for bond behavior of FRP bar in lightweight concrete are very limited to date. So, bond characteristic between lightweight concrete and helically deformed GFRP bar was investigated in this study. Three main parameters were considered in experimental investigation: type of rebar, concrete type, and compressive strength of lightweight concrete. As an experimental result, it could be known that bond strength of helically deformed GFRP bar in lightweight concrete was 0.49 times bond strength of steel reinforcement in normal concrete.
Influence of Micro-Structural Characteristics of Concrete on Electrical Resistivity
Yoon, In-Seok ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 122~129
DOI : 10.11112/jksmi.2013.17.6.122
Since electrical resistivity of concrete can be measured in a more rapid and simple way than chloride diffusivity, it should be primarily regular quality control of the electrical resistivity of concrete which provides the basis for indirect of quality control of chloride diffusivity during concrete construction. If this is realized, the electrical resistivity of concrete can be a crucial parameter to establish maintenance strategy for marine concrete structures. The purpose of this study is to develop, design and test a surface electrical resistivity measurement protocol. Microstructural affecting factors such as capillary water, porosity, tourtousity, and so on, on the electrical resistivity of concrete were examined taking into account for mixing proportion properties, and hydration stage. This study can provide a non-destructive approach for durability design of marine concrete. From the relationship between electrical resistivity and chloride diffusivity, it is expected that the result is subsequently used as a calibration curve for an indirect control of the chloride diffusivity based on regular measurements of the electrical resistivity during concrete construction.
A Study on the Properties of Foamed Concrete with Plaster Using the Experimental Design
Lee, Sang-An ; Kim, Wha-Jung ; Yoon, Sang-Chun ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 130~137
DOI : 10.11112/jksmi.2013.17.6.130
This research was performed through the experimental design to get the statistical analysis on foamed concrete mixed plaster with hydrogen peroxide. In this experiment, we set the ratio of each material, which part of lightweight concrete, as experimental factors and evaluated on the mechanical properties by statistical analysis for response variables obtained from experiments. Experimental factors are plaster replacement, water binder ratio, and hydrogen peroxide ratio. Response variables are dry density, compressive strength, and flexural strength. Mixing design of the foamed concrete set up a total of 15 experimental points by Box-Behnken (BB) method of the response surface analysis. Thus, the results of a study were summarized as follows. Values of the probability in experimental factors (plaster replacement, water binder ratio and hydrogen peroxide ratio) on the response variables were estimated to be significant at the 95% of confidence limit. On response surface analysis for dry density of foamed concrete, water binder ratio and hydrogen peroxide ratio were estimated to be significant (
A Study on the Physical Property by Construction Condition of Urethane Waterproofing Membrane
Kim, Young-Sam ; Han, Cheon-Goo ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 138~144
DOI : 10.11112/jksmi.2013.17.6.138
This study is for quality standard establishment of urethane waterproofing membrane method which is mostly applied to waterproofing method for underground parking lot and rooftop. The experiments were carried out on color differences, membrane thickness, tensile property by curing period of liquid urethane before placing protective concrete, and resistance of crack movement according to different substrate surface and reinforcement of non-woven fabric. As a result of experiments, it was found that color differences is increase, membrane thickness is thick, tensile property is low as concrete placing period is shorter. In the fatigue property, membrane thickness of 3 mm was not broken, but 1~2 mm was broken and in the case of the membrane reinforced with non-woven fabric was more stable comparatively non-reinforcement one.
Improvement of Durability in Concrete Structures Using CRM
Kim, Chun-Ho ; Kim, Sang-Doh ; Kim, Nam-Wook ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 145~152
DOI : 10.11112/jksmi.2013.17.6.145
As a typical construction material, concrete has been used in building all kinds of structures since the late
century. Although it was recognized to secure durability as long as the regulations on design and construction have been reasonably complied, the trends of life-shortening and deterioration have frequently occurred due to all kinds of the external effects that have been experienced during the procedures of using the structures. To make matters even worse, deterioration of the concrete structures according to deterioration can not be controlled any more. Finally, the reality is that repair and maintenance are necessary in the maintenance aspect of the concrete structure. In this study, CRM(Chemical Resistance of Laminating Reinforcement Method), which had been developed to reinforce the surface of concrete and specially improve chemical resistance performance, has been applied to enhance the existing repairing and maintenance method. Therefore, the result has been drawn with comparison and analysis of the specimens applied with the general repairing and maintenance method and CRM through a variety of durability test in this study. With the result of the test, durability of the specimen applied with CRM has been more improved than the existing repairing and maintenance method, which is judged as because of the laminating effect due to reinforcement of epoxy impregnated of alkali-resistance fiber and double layered fiber reinforced seat.
A Study on Standardization Guidelines for BIM-based Maintenance and Management of Civil Infrastructures
Ji, Seung-Gu ; Kim, Ji-Won ; Seo, Jong-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 17, issue 6, 2013, Pages 153~161
DOI : 10.11112/jksmi.2013.17.6.153
This paper provides core standardization items and method for the building information modeling (BIM) based maintenance and management (M&M) of civil infrastructure. Value chain of the M&M and characteristics of BIM technology has been analyzed and compared. As a result, it has been revealed that the initial activity recording damage information is very similar to the BIM-based information operation. The core standardization items for generation and operation of BIM data were identified according to the M&M value chain, The identified items were categorized into common standard item and specialized items for M&M of civil infrastructure, and proper government funded organizations for each standardization items were introduced on the basis of the roles in the laws.