Go to the main menu
Skip to content
Go to bottom
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 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
Experimental Study for the Structural Stability of Permanent Anchor
Yoo, Nam-Jae ; Park, Byung-Soo ; Park, Chan-Deok ; Hong, Young-Gil ; Lee, Jong-Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 87~98
This paper is an experimental result of performing the prototype of anchor tests in field to investigate the ultimate uplifting capacity of permanent anchor embedded in weathered rock. For prototype of actual anchor test in situ, four grouted anchors having various anchor lengths were installed in field and their ultimate uplift capacities were obtained by analyzing test results of load-displacement curves obtained from field uplift tests. On the other hand, creep tests, applying pull-out loading at the stage of the maximum loading during 15 minutes, were performed to investigate ultimate resisting capacity of anchor so that the values of creep rate at the ultimate loading conditions were evaluated. Dial gauges were installed on the surface of ground to measure the vertical displacement distribution from the anchor so that the failure mechanism of permanent anchor embedded in weathered rock and failure boundary of ground during application of loading were evaluated.
Numerical Analysis at Anchorage Zone Using Prestressing Order for PSC Bridges
Jo, Byung-Wan ; Tea, Gi-Ho ; Oh, Sea-Jun ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 97~105
PSC box girder bridges usually have a lot of tendons, and the difference of the bursting forces lies in the prestressing order of the tendons. As a result of the lack of studies on the prestressing order for the bridges, the order depends on the designer's intuition and experiences. In this paper, with investigation into various methods determining the bursting force of the anchorage, reasonable prestressing order is determined by analysis of PSC beam bridge and PSC box girder bridge with most suitable method. It may be stated that this study would be useful for determining the reasonable prestressing order of tendons for the PSC box girder bridges.
Evaluation of Shrinkage Properties Based on Mock-Up Testin High Performance Concrete
Han, Cheon-Goo ; Kang, Su-Tae ; Koh, Kyung-Taek ; Hann, Chang-Pyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 106~114
This paper investigates the fundamental properties and shrinkage characteristics of low shrinkage high performance concrete(LSHPC), using mock-up specimens. According to the test results, the most suitable mix proportions of LSHPC need a higher dosage of SP agent and AE agent, in order to obtain the target of slump flow and air content. This is due to reduce fluidity and air content respectively. It also presented earlier setting time than control concrete by 6 hours and exhibited compressive strength of 60MPa at age 28 days. Autogenous shrinkage of LSHPC was the half of the value of control concrete. Drying shrinkage of center section of LSHPC showed similar tendency with autogenous shrinkage, because of no internal moisture movement, while surface section had larger drying shrinkage. The specimen with embedded reinforcing bar had smaller deformation owing to confinement of reinforcing bar.
Evaluation of Limit Strength for Steel Cable-Stayed Bridgesusing Various Cable Elements
Song, Weon-Keun ; Rhee, Jong Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 115~121
This paper deals with the influence of behavior of a variety of cable elements on the limit strength of steel cable-stayed bridges. The softening plastic-hinge model, which is represented in this study for the limit strength evaluation of the example bridge, considers both geometric and material nonlinearites. Geometric nonlinearity of beam-column members are accounted by using stability function, and material nonlinearity - by using CRC tangent modulus and parabolic function. Cable sag effect is considered for cable members. The result of this study shows that the limit strength of the example bridge using the equivalent of elasticity for truss straight elements is smaller than those using the cable or the catenary elements.
Crack Growth and Debonding Behaviors of the Pre-cracked RC Beams Repaired with Carbon Fiber Sheets
Kim, Chung Ho ; Ko, Sin Woong ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 121~129
This study look into the mechanisms of growth and magnification of the cracks and delamination in the pre-cracked RC beams repaired with carbon fiber sheets. The experimental parameters were loading type, loading speed and crack. In the experiments, it was confirmed that a failure of beams began with development and propagation of the stepped delamination in the below the loading point due to the rapid change of shear force, but mechanisms of the failure were not influenced with loading type, loading speed and pre-cracks. Particularly, in the case of beams having the pre-cracks, growth of crack concentrated at the special crack below the loading point and led to failure of the beam by delamination due to magnification of crack.
A Study on Structural Behavior of Composite Deck Plate using a Pre-assembled Re-bar Truss
Yoo, Byung-Uk ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 129~138
Composite deck plate using a pre-assembled re-bar truss for slab with corrugated zinc galvanized sheet iron at manufactory, is given the improvement on design, manufacture, and performance for construction work of cast-in-place reinforced concrete slab by enabling to cast concrete directly without the form work. There are two methods in analyzing composite deck : Simplified 2D analysis and 3D analysis. Although simplified 2D analysis is being used up to date, the use of 3D analysis, allowing for the vierendeel behavior of composite deck by real configuration correlating to bar reducing, is demanded. To compare the simplified 2D analysis applied to allowable stress design with 3D analysis applied to limit state design, 8 specimen are manufactured. Main variables include the depth of slab, the length of span, the diameter of bottom bar and lattice bar, and the presence of corrugated zinc galvanized sheet iron. The comparison from the experimental result and analytical result indicates that applying of simplified 2D analysis is possible for the use of D10 with bottom bar. However, it is more reasonable to apply 3D analysis which allows to indicate vierendeel behavior considered the real configuration.
An Experimental Study on the Strength Development of ConcreteUsing of the Oyster Shells
Koo, Hae-Shik ; Jun, Hak-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 137~147
This is an experimental study on the properties and the strength development of concrete using of the oyster shells as a substitute fine aggregate of concrete. For this purpose, the fundamental experiments of the materials and the main factors on it were considered and then the workability and many kinds of strength about the specimens were also studied. As the experimental results, there were strength differences of less than 10% between concrete with oyster shells and normal and the most excellent grain size of oyster shells is 5.0mm and less with taking uniformly and the percentage of practicable substitution of them to fine aggregate about 30%. This paper also represents the relationship equations among many kinds of strength and elastic modulus of concrete with the oyster shells decreased with increase in proportion of oyster shells and curve of it is similar about the percentage of substitution of 10%.
A Study on the Properties of Latex Modified Concrete using Recycled Coarse Aggregate
Yoo, Deok-Ryong ; Go, Seong-Seok ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 147~156
This study is purposed to improve the performance of concrete made of recycled coarse aggregate. For this, recycled aggregate concrete was produced with SBR latex, and fluidity, dynamic performance and drying shrinkage were examined. According to the result, with mixing 6% of SBR latex, fluidity having resistance against segregation can be insured and compressive and flexural strength was increased. Especially the increment in terms of flexures was remarkable. In addition to, with above mixing ratio, drying shrinkage was reduced. Therefore there is a strong inference that superior recycled aggregate concrete can be produced with using 6% of SBR latex.
An Experimental Evaluation on Performance of Surface Protector for Concrete Structures
Nam, Yong-Hyuk ; Chung, Young-Jun ; Jang, Suk-Hwan ; An, Young-Ki ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 157~163
This study is on the evaluation of double surface protection method using water repellent primer and final top coat to protect concrete. Water repellent agent has been applied on the final top coat to protect concrete. However, to make up for the weakness to the ultraviolet of the water repellent, the work procedure of these protectors is done vice versa. This combination of protectors was compared with existing ones in this study. Even though the final top coat was applied on the water repellent primer, its adhesive strength met to KS F 4936-' 03 with other protectors used in this study. All surface protectors used in this study were excellent in protecting concrete. Especially, in case of applying with final top coat in conjunction with water repellent primer, the resistance against chloride ion penetration and neutralization by
was more efficient than other surface protectors used in this study under this given condition.
A Study on the Determination of Construction Depth of Vertical Drain by Cone Resistance
Jang, Seo-Yong ; Kim, Jong-Ryeol ; Shin, Yun-Sup ; Ma, Bong-Duk ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 163~170
Recently, piezocone penetration test is frequently used in order to estimate the characteristics of soft ground with standard penetration test, generally used in the past. In this study, the correlation of standard penetration test, piezocone penetration test and driving resistance of vertical drain is analyzed in order to increase the confidence for determination of soft ground depth. As the results of each zone, the relation between standard penetration test and piezocone penetration test shows qc=(1.09~1.63)N at the soft ground, determined by 5/30 N value which is decided for soft ground criteria. And qc=(1.21~1.98)N was shown at the point of compressible layer, evaluated by the preconsolidation pressure. And driving resistance of vertical drain is
which is equal to
of cone penetration resistance.
Spalling Reduction Methods of Ultra High-Strength Reinforced Concrete Columns
Shin, Sung-Woo ; Yoo, Suk-Hyeong ; Kim, In-Ki ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 171~178
It was presented that the spalling of high strength concrete exposed to high temperature could be reduced by using polypropylene fiber. However, as the concrete strength increase, the demanded quantity of PP fiber increase and this results in the loss of workability of ultra high strength concrete. The silica fume which is essentially mixed in ultra high strength concrete decrease the permeability of concrete, and this will increase the degree of spalling. In this study the effect of silica fume on the spalling of ultra high strength concrete and the fire resisting efficiency of PP fiber and poly vinyl alchol, instead of PP fiber, for the security of workability were experimentally examined.
Evaluation of the Bending Moment of FRP Reinforced Concrete Using Artificial Neural Network
Park, Do Kyong ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 179~186
In this study, Multi-Layer Perceptron(MLP) among models of Artificial Neural Network(ANN) is used for the development of a model that evaluates the bending capacities of reinforced concrete beams strengthened by FRP Rebar. And the data of the existing researches are used for materials of ANN model. As the independent variables of input layer, main components of bending capacities, width, effective depth, compressive strength, reinforcing ratio of FRP, balanced steel ratio of FRP are used. And the moment performance measured in the experiment is used as the dependent variable of output layer. The developed model of ANN could be applied by GFRP, CFRP and AFRP Rebar and the model is verified by using the documents of other previous researchers. As the result of the ANN model presumption, comparatively precise presumption values are achieved to presume its bending capacities at the model of ANN(0.05), while observing remarkable errors in the model of ANN(0.1). From the verification of the ANN model, it is identified that the presumption values comparatively correspond to the given data ones of the experiment. In addition, from the Sensitivity Analysis of evaluation variables of bending performance, effective depth has the highest influence, followed by steel ratio of FRP, balanced steel ratio, compressive strength and width in order.
Static Strength of Cramp Joint at Precast Highway Deck Slabs
Kim, Yoon-Chil ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 187~193
A new jointing method using steel cramps with a unique configuration was developed for the field joint of precast deck slabs of highway bridges. In this jointing method, the looped distribution bars are connected by the cramps to the main reinforcements. Therefore, the joint can transfer the bending moment and shearing force through the interlocking effect caused by the cramps, and it is both excellent in installation on-site and economical compared with the loop joint currently in use. In order to confirm the bending and shear capacities and to clarify the failure mechanism of the joint, a series of static loading tests were carried out. From the results of these experimental studies, it was clarified that the cramp joint has enough load carrying capacity being equivalent to the loop joint.
Stiffness Prediction of Flatplate System According to Column Section Shape
Lee, Do-Bum ; Lee, Li-Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 194~202
In the present study, stiffness prediction methodologies for flat-plate structures were evaluated in comparison with the experimental results on the full-scale slab-column connections of flat-plate structures. The methodologies are as follows: the methodology proposed by Jacob S. Grossman and the methodology proposed by Choi & Song. The former does not predict the stiffness change of the slab-column connection due to the change in the column section shape and the latter overestimates the stiffness when edge length of the column section in the loading direction is long. In the present study, the equation to calculate the effective width of slabs was modified to reflect the effect of the change in the column section shape.
Optimization of Direct Design System of Steel Framesusing Advanced Analysis and Genetic Algorithm
Choe, Se-Hyu ; Roh, Woo-Hyuk ; Kim, Jong-In ; Park, Kyung-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 203~211
In this paper, the optimization of direct design system of steel frames by genetic algorithm involving advanced analysis are performed. For the analysis of steel frames advanced analysis accounting for geometric nonlinearity and material nonlinearity are executed. The genetic algorithm was used as optimization technique. The weight of structures is treated as the objective function. The constraint functions are defined by load-carrying capacities, deflections, inter-story drifts, and ductility requirement. The effectiveness of the proposed method are verified by comparing the results of the proposed method with those of other method.
Numerical Study of Lightweight FRP Bridge Deck System Induced by Thermal Stress by Fire
Jung, Woo-Young ; Park , Hee-Kwang ; Park , Moon-Ho ; Lee , Hyung-Kil ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 5, 2006, Pages 211~217
This analysis evaluated small and large temperature gradient effects on the FRP deck considering lightweight of FRP deck and ply orientations at the interface between steel girders and FRP deck. Finally, the analytical results shows the possible failure mechanism of FRP deck under various temperature changes and its corresponding index is suddenly varied depending on the rapid change of temperature on the deck plate.