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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
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Volume & Issues
Volume 10, Issue 6 - Nov 2006
Volume 10, Issue 5 - Sep 2006
Volume 10, Issue 4 - Jul 2006
Volume 10, Issue 3 - May 2006
Volume 10, Issue 2 - Mar 2006
Volume 10, Issue 1 - Jan 2006
Volume 10, Issue 1 - Jan 2006
Selecting the target year
Prediction Model on Autogenous Shrinkage of High Performance Concrete
Yoo, Sung-Won ; Soh, Yang-Sub ; Cho, Min-Jung ; Koh, Kyung-Taek ; Jung, Sang-Hwa ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 97~105
The autogenous shrinkage of high-performance concrete is important in that it can lead the early cracks in concrete structures. The purpose of the present study is to explore the autogenous shrinkage of high-performance concrete with admixture and to derive a realistic equation to estimate the autogenous shrinkage model of that. For this purpose, comprehensive experimental program has been set up to observe the autogenous shrinkage for various test series. Major test variables were the type and contents of admixture and water-cement ratio is fixed with 30%. The autogenous shrinkage of HPC with fly ash slightly decreased than that of OPC concrete, but the use of blast furnace slag increased the autogenous shrinkage. Also, the autogenous shrinkage of HPC is found to decrease with increasing shrinkage reduction agent and expansive additive. A prediction equation to estimate the autogenous shrinkage of HPC with admixture was derived and proposed in this study. The proposed equation show reasonably good correlation with test data on autogenous shrinkage of HPC with mineral and chemical admixture.
tudy on Seismic Design of Buckling Restrained Braced Frame System Using Inverse Stiffness Method
Kim, Se-Hyun ; Park, Sung-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 106~114
This study proposed the applicability of inverse stiffness method on the seismic design for steel frame with buckling restrained braces and the design results were compared with former research's. The concept of this method is simple and efficient. Furthermore it is able to reflect the high mode's effect and control the ductility factors of each story individually. Design results using the proposed method showed that according to increase of the given target drift, the areas of brace generally decreased but partially increased in some stories of the tall structure with very large ductility. And the post yield stiffness ratio's variation had more effect on the design results in the small post yield stiffness ratio.
Corrosion Resistance of Cr-bearing Rebar in Concrete Subjected to Carbonation and Chloride Attack
Tae, Sung-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 115~122
Ten types of steel bars having different Cr contents were embedded in concretes with chloride ion contents of 0.3, 0.6, 1.2, and
to fabricate specimens assuming such deteriorative environments. After being carbonated to the reinforcement level, these concretes were subjected to corrosion-accelerating cycles of heating/cooling and drying/wetting. The time-related changes in the corrosion area and corrosion loss of the Cr-bearing rebars were then measured to investigate their corrosion resistance. The results revealed that in a deteriorative environment prone to both carbonation and chloride attack, corrosion resistance was evident with a Cr content of 7% or more and 9% or more in concretes with chloride ion contents of 1.2 and
Design Vessel Selection of Maritime Bridges using Collision Risk Allocation Model
Lee, Seong-Lo ; Lee, Byung Hwa ; Bae, Yong-Gwi ; Shin, Ho-Sang ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 123~134
In this study ship collision risk analysis is performed to determine the design vessel for collision impact analysis of the maritime bridge. Method II which is a probability based analysis procedure is used to select the design vessel for collision impact from the risk analysis results. The analysis procedure, an iterative process in which a computed annual frequency of collapse(AF) is compared to the acceptance criterion, includes allocation method of acceptance criterion of annual frequency of bridge component collapse. The AF allocation by weights seems to be more reasonable than the pylon concentration allocation method because this AF allocation takes the design parameter characteristics quantitatively into consideration although the pylon concentration allocation method brings more economical results when the overestimated design collision strength of piers compared to the strength of pylon is moderately modified. From the assessment of ship collision risk for each bridge pier exposed to ship collision, a representative design vessel for all bridge components is selected. The design vessel size varies much from each other in the same bridge structure depending upon the vessel traffic characteristics.
Prediction of Concrete Fracture Energy using Mix Design Nomogram
Kang, Sung-Hoo ; Park, Sun-Joon ; Jeung, Chul-Oh ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 133~142
The purpose of this study is to predict the fracture energy in accordance with the combination variables by applying the mix design nomogram in ready mixed concrete products. In terms of the experiment for drawing up Mix Design Nomogram, the beam is manufactured based on the mixture table described in the specifications of ready mixed concrete manufacturing company and a three-point bending test suggested in RILEM 50-FMC Committee is performed. As a result, this study makes sure the possibility to apply the mix design nomogram that is possible to predict the fracture energy in ready mixed concrete products and enables one to achieve the automation of the design of mixture for the production of ready mixed concrete products with the development of program using it.
Bond Models for GFRP Rebar Embedded in Concrete
You, Young-Jun ; Park, Ji-Sun ; Park, Young-Hwan ; Kim, Hyeong-Yeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 143~151
This paper presents the comparison of the goodness-of-fit test of analytical bond models between concrete and steel or GFRP reinforcements. Bond test specimens were prepared in accordance with the CSA codes and the rebars used in the test were steel and two types of commercial GFRP rebar products. Using the test data, a bond model was proposed, and comparison of goodness-of-fit test for existing bond models and proposed bond model was carried out by the least squares method. The result indicates that the proposed bond model has better goodness-of-fit test than the existing ones.
Capacity Evaluation of Compressive Member Confined by Carbon Sheet Tube
Lee, Kyoung-Hun ; Kim, Hee-Cheul ; Hong, Won-Kee ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 152~159
An experimental research has been performed to investigate capacity of CFCST(Concrete Filled Carbon Sheet Tube) columns because column member is one of the most important structural members. Generally, two shapes of column sections, rectangular and circular shapes, are designed but the circular shape which has constant curvature was chosen for this study. Total 17 column specimens confined by carbon sheet tube were tested using 10,000kN universal test machine(UTM).
Web-based Monitoring System for a Railroad Tunnel by Wireless Internet
Lho, Byeong-Cheol ; Kim, Jong-Woo ; Kim, Jeong-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 159~164
Mobile communication with wireless modem can be powerful tool in web-based structural health monitoring system in which power and communication method are crucial points. In this study, the major reasons of side cracks in tunnel lining are studied by FEM analysis. In addition, a web-based monitoring system using mobile communication with wireless modem is applied to the tunnel structure to monitor the long term behavior of the side cracks. The field application shows that CDMA is useful method for structural health monitoring system which installed long distance away.
Failure Prediction and Behavior of Cut-Slope based on Measured Data
Jang, Seo-Yong ; Han, Heui-Soo ; Kim, Jong-Ryeol ; Ma, Bong-Duk ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 165~175
To analyze the deformation and failure of slopes, generally, two types of model, Polynomial model and Growth model, are applied. These two models are focused on the behavior of the slope by time. Therefore, this research is more focused on predicting of slope failure than analyzing the slope behavior by time. Generally, Growth model is used to analyze the soil slope, to the contrary, Polynomial model is used for rock slope. However, 3-degree polynomial(
) is suggested to combine two models in this research. The main trait of this model is having an asymptote. The fields to adopt this model are Gosujae Danyang(soil slope) and Youngduk slope(rock slope), which are the cut-slope near national road. Data from Gosujae are shown the failure traits of soil slope, to the contrary, those of Youngduk slope are shown the traits of rock slope. From the real-time monitoring data of the slope, 3-degree polynomial is proved as excellent system to analyze the failure and behavior of slope. In case of Polynomial model, even if the order of polynomials is increased, the
value and shape of the curve-fitted graph is almost the same.
Research on Variable Girder Types and Tendon Arrangement of PSC Box Girder Bridges by using the Optimum Design
Kim, Ki-Wook ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 175~185
This study performed the optimum design of balanced and unbalanced span length bridges with many variable Girder types by using the optimum design program to minimize the cost for PSC box girder bridge of the full staging method. The objective of this study is to present tendon's application direction about complicated construction hereafter by studying about optimum tendon arrangement that is worked in each variable Girder type. This program used SUMT procedure and Kavlie's extended penalty function to allow infeasible design points in the process. Powell's direct method was used in searching design points and Gradient Approximate Method was used to reduce design hours.
Fracture Toughness of Concrete Brazilian Disk according to Maximum Size of Coarse Aggregate
Lee, Seung-Hoon ; Kim, Hee-Sung ; Jang, Hee-Suk ; Jin, Chi-Sub ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 185~196
Fracture toughness is a material property for crack initiation and propagation in fracture mechanics. For mode I fracture toughness measurement in concrete, RILEM committees 89-FMT proposed three-point bend tests based on the two-parameter fracture model. But, there is no proposed test method as a standard for mixed mode test for now. And RILEM three-point bend test procedure is complicate. Therefore, in this study, brazilian disks of various size were designed as the concrete with a similar specified concrete strength and maximum size of coarse aggregate(
) were respectively 20mm and 40mm. And mode I fracture toughness of brazilian disks was compared with that of RILEM three-point bend test. As a result, it was suggested appropriate size(thickness, diameter) and notch length ratio of brazilan disk on the
. And it was verified that stress intensity factors for mixed mode can be easily calculated with the disk specimen. Stress intensity factors of a concrete brazilian disk were evaluated with finite element analysis and five terms approximation for comparison.
An Experimental Study on the Fundamental Properties and Durability of Sewer Type Restorative Mortar Spread with Antibiotics
Kim, Moo-Han ; Kim, Gyu-Yong ; Kim, Jae-Hwan ; Cho, Bong-Suk ; Lee, Dong-Heck ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 195~202
Deterioration of sewer concrete is representative that biochemical corrosion according to the
has growth by inhabit sulfur-oxidzing bacteria because of special environment in sewer. But in case of domestic, fundamentally, sulfur-oxidzing bacteria could moderate development of repair material method is need because of corrosion prevent method is inconsideration with carry out to improve project. In this paper, after development of spread type antibiotic with antibio-metal, antibacterial performance about sulfur-oxidzing bacteria of antibiotic and tested to estimate fundamental properties of bonding strength, abrasion contents, contents of water absorption, contents of air permeability, carbonation depth, chloride ion penetration depth and chemical resistance of spread with antibiotic restorative mortar.
Lateral Load Distribution Factor for Pushover Analysis including Higher Mode Effects
Kim, Geon-Woo ; Song, Jin-Gyu ; Lee, Cheol-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 203~210
A procedure for determining the lateral load pattern for pushover analysis which includes higher mode effects is presented in this study. It is well-known that the details of future earthquakes at particular site is almost impossible to predict accurately and that the code-design spectra try to represent at least the average nature of probable future earthquakes. Thus the code-design spectrum is directly used as the input earthquakes in this paper when incorporating higher mode effects in the pushover analysis so that the efforts for selecting input motions and constructing response spectrum needed in some existing method could be avoided. A case study based on the time history analysis of a irregular steel moment frame showed that the procedure proposed in this study generally outperforms various pushover analysis procedures of ATC-40 and FEMA 273. However, the proposed procedure tended to be conservative as compared with the time history analysis method.
Hysteretic Behavior of Slab-Column Joint Using Bended Type Shear Reinforcement
Lee, Hyun-Ho ; Lee, Do-Bum ; Lee, Li-Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 3, 2006, Pages 211~218
From the development of residential flat plate system, continuously bended shear reinforcement is developed for the prevention of punching shear. To know the punching shear capacity of developed shear reinforcement in slab-column joint, structural test is performed. The testing parameters are shear reinforcement types, such as no reinforcement, bended shear reinforcement, and head stud reinforcement. To verify the lateral capacity, cyclic load is applied under the constant vertical load condition. The results of tests are compared to as global displacement, slab-column joint strength. From the test results, the resisting capacity of developed shear reinforcement system has a good performance in the story drift ratio.