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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 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
Analytical Study on the Seismic Capacity for Existing Masonry Building in Korea
Heo, Jae-Sang ; Lee, Sang-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 75~87
In this study, FEM analysis has been performed based on the results from domestic experimental researches regarding to material and member characteristics of masonry. After validation of reliability for the used FEM analysis method, this study is progressed the evaluation of seismic capacity for existing prototype masonry building in Korea. According to the evaluation for the prototype masonry building, the horizontal shear force and the average shear stress are similar to those of previous studies.
An Experimental Study on the Performance Evaluation of Repair Method of RC Structure Using Fire Resistance Engineered Cementitious Composites(FR-ECC)
Kim, Jeong-Hee ; Kim, Jae-Whan ; Park, Sun-Gyu ; Kwon, Young-Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 88~96
In this Study, FR-ECC(Fire Resistance Engineered Cementitious Composites) in which at same time it can improve the endurance and fire-resistance efficiency of a Structure was developed, and the experimental study such as thermal characteristic, Fire-resistance efficiency, and etc was performed for using FR-ECC as the repair materials for building and civil Structure. Moreover, it was evaluated about the field applicability of FR-ECC. As a result, FR-ECC is superior to the existence fire resistance repair mortar in strength and durability property. Also, FR-ECC was exposed to have the characteristic of being excellent than existence fire resistance mortar in the field applicability.
Estimation of Safety and Economical Efficiency of Large High Tension Bolted Joints
Sung, Ki-Tae ; Kyung, Kab-Soo ; Lee, Seung-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 97~105
This study was conducted for the purpose of examinating the safety and economical efficiency of large high tension bolted joints. The specimen using F10T-M30 large high strength bolts has been selected and static tensile test has been conducted to evaluate the slip characteristics. In addition, finite element analysis has been carried out to estimate the number of required bolts. As a result, the average slip coefficient of M30 high strength bolts exceeded 0.4 - the standard in highway bridge design specification - and has satisfied the slip strength, which is the same as that of M22 high strength bolts. In addition, if F13T-M22 high strength bolts were applied, the number of required bolts decreased by 21%, and if F10T-M30 high strength bolts were applied, the number of required bolts decreased by 46%, that leads to the conclusion that the economical efficiency in accordance with diametering of high strength bolts was now verified.
A Study on the Flexural Capacity of Rectangular Section Wood Using Synthetic Resins
Park, Kwang-Seob ; Kang, Pyeong-Doo ; Ha, Jong-Han ; Park, Sung-Moo ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 106~114
The basis principle of conservation about deterioration and corrosion of cultural assets building is the archetype maintenance, and should not make a factitious damage mistake by repair. Accordingly, conservation processing method using synthetic resins is embossed. The purpose of this paper is about flexural capacity of rectangular section wood using synthetic resins, the 11 specimens are manufactured and made an experiment about reinforcement length, ratio, material strength, direction of synthetic resins as variable. The results of this paper has shown that flexural reinforcement of wood by synthetic resins are efficient and found the possibility of using.
Structural Performance of Reinforced Concrete Beams Exposed to Freeze-Thawing Environment After Strengthening in Shear with Carbon Fiber-Reinforced Polymer(CFRP)
Song, Seon-Hwa ; Kim, Sun-Woo ; Park, Wan-Shin ; Choi, Ki-Bong ; Yun, Hyun-Do ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 115~125
In these days, carbon fiber-reinforced polymers (CFRP) have been widely used for retrofitting and/or strengthening structural elements. However, there are not enough test data to predict the long-term performance of the retrofitted structures exposed to freeze-thawing cycles. This paper presents the results of experimental program undertaken to investigate the effects of freeze-thawing cycling (from-18 to
) on the behavior and failure characteristics of reinforced concrete (RC) beams strengthened in shear with CFRP sheet and plate using acoustic emission (AE) technique.
Flexural Behavior of Reinforced Concrete Beams Exposed to Freeze-Thawing Environments
Jang, Gwang-Soo ; Yun, Hyun-Do ; Kim, Sun-Woo ; Park, Wan-Shin ; Choi, Ki-Bong ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 126~134
Generally, reinforced concrete structures exposed to the outside temperature are affected by freezing and thawing process during winter and early spring. These freeze-thawing process can lead to the reduction in durability of concrete as cracking or surface spalling. This paper is to study the flexural behavior of RC beams exposed to freeze-thawing environments. To compare the difference in flexural behavior of RC Beams, limited tests were conducted under different types of Longitudinal steel ratio and freeze-thawing cycles. For this purpose, fourteen small-scale RC beams (
) were strengthened in monotonic and cyclic loadings, subjected to up to 150, 300 cycles freeze-thawing from
. It is thought that experimental results will be used as basic data to evaluate flexural behavior of RC beams exposed to freeze-thawing.
An Experimental Study on Developing Ultra-High Strength Powder Concrete Using Low-heat Portland Cement
Jo, Byung-Wan ; Yoon, Kwang-Won ; Kim, Heoun ; Park, Jin-Mo ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 135~147
In order to develop the ultra high strength concrete over 400Mpa at 28 day, Low-heat portland cement, ferro-silicon, silica-fume and steel fiber were mixed and tested under the special autoclave curing conditions. Considering the influence of Ultra high strength concrete. normal concrete is used as a comparison with low water-cement ratio possible Low-heat portland cement. Additionally, as a substitution of aggregates, we analyzed the compressive strength of Ferro Silicon by making the states of mixed and curing conditions differently. In addition, SEM films testified the development of C-S-H hydrates of Type III & Type IV, and tobermolite, zonolite due to the high temperature, high pressure of autoclave curing. Fineness of aggregate, filler and reactive materials in concrete caused 420Mpa compressive strength at 28day successfully.
A Parametric Study of Flexural Stiffness Ratio on Floor Slabs for Seismic Design of Shear Wall Structures
Oh, Soon-Taek ; Lee, Dong-Jun ; Em, Young-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 148~155
A remarkable discrepancy of lateral deformation of shear wall structures for seismic loads due to a rigid diaphragm assumption without floor slab modelling asks a study how much effective the slab stiffness ratio is to the lateral behaviour. Typical shear wall type 15 stories structure is selected to analysis using MIDAS-ADS2008 commercial softwares modelling three types; 1) rigid diaphragm (RD model) 2) considered out-of plane slab flexural stiffness (DB model), and 3) considered in and out of plane slab flexural stiffness (SRC model). Based on National Code of KBC2005, the Equivalent Static and Response Spectrum seismic analysis are undertaken to compare each responses of the three models. The differences of lateral responses due to the three slab stiffness ratios applied on the models are compared and discussed.
Application of Vibration Method for Estimation of Tension Force of Stay Cables in World-Cup Stadiums
Chang, Kug-Kwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 156~165
This study is to consider the character of cables in six World-Cup stadiums constructed in 2002 and to inspect problems on measurement natural frequencies interpretation and application of existing theory. The results of the experiment were shown that it was possible to determine the tension force of the real cables with an accuracy of 8% by taking the cable bending stiffness. But for the range of cable affected greatly by bending stiffness(
), it was appeared the tendency to increase estimated error and was considered to need additional study of this range. Estimated tension error could not be improved so much in comparison to the case using single mode of vibration even through multiple modes of vibration were used.
An Experimental Study to Evaluate the Flexural Performance of Steel Fiber-Reinforced Self-Compacting Concrete
Park, Yon-Dong ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 164~173
An experimental study was carried out to estimate the flexural performance of steel fiberreinforced self-compacting concrete. Seven slabs with three different steel fiber-reinforced concretes were prepared to make beam specimens. After proper curing period, each slab was cut to five beams with a diamond saw. The beam specimen was tested with displacement control method to obtain load-deflection curve. As the results, the self-compacting concrete beam showed higher flexural strength, ductility and toughness index compared to the normal concrete beam. This means that steel fiber-reinforced self-compacting concrete can be used more widely in the field of architecture and civil engineering because of its self-compactability and good mechanical properties.
Evalution for Joints of Coastal Environments Blocks
Kim, Chun-Ho ; Kim, Kwang-Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 176~182
Other damage can occur due to the preexisting dull structure and installation of nonenvironmental-friendly concrete structure, lack of function for preventing coastal erosion. Increase of personal income and fast spread of the concept of waterfront casued the initiation of many project to improve aging coastal ports. However, none of environment-friendly structure has been developed and pre-existing solid block, igloo block, tunnel block are used commonly. In piers and lighter's wharf where the ships are mooring, resonance by the generation of a reflected wave caused by penetration wave in the port and port wave increases wave heights in the port and makes difficult to maintain the temperature, causes problems in mooring ships and cargo-working, and eventually increase the occurance of damages of the small ships by the collision. Therefore, development of new types of blcok is necessary. To apply Coastal Environments block developed for this reason, it requires allowable bearing capacity evaluation of shear key. For this study, we made test specimen for connecting part of C.E. Block, and conducted friction test of boundary surface. Data obtained by the experiment was analyzed by finite element analysis and assessed the coefficient of friction between C.E. Block and boundary surface.
Behavior and Safety Factor of Nailed-Soil Excavation Wall During Earthquake
Jo, Young-Jin ; Kwak, Myeong-Chang ; Choi, Se-Hyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 183~191
In this study, the behavior and safety factor of a nailed-soil excavation wall during earthquake is presented. The horizontal displacement, axial force, shear force, and moment of facing of a nailed-soil excavation wall subjected to static and seismic load are analyzed using time history analysis. The safety factor based on the strength reduction technique proposed by Dawson and Roth is used to calculate the safety factor of a nailed-soil excavation wall during earthquake. The safety factor by the proposed method is verified by comparing with those by other methods.
Structural Stability Analysis Study for Existing Subway Tunnels Using a 3D Stress-Pore Pressure Coupled Finite Element Modelling of NATM Tunneling
Kong, Byung-Seung ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 192~203
In the new Seoul-Busan high speed railroad construction specially in area of city center passage the roadbed establishment is recommended the staibility for the existing subway tunnel segments of Busan subway 1st and 2nd lines regarding the appearance condition, a quality condition and the durability of the objective facility, and it evaluates the numerical analysis using MIDAS/GTS which leads the stability of the objective facility and investigatesd tunnels. Fundamental issues in tunneling under high groundwater table are discussed and the effect of groundwater on tunnel excavation was examined using a 3D stress-pore pressure coupled Finite-Element Method. Based on the results the interaction mechanism between the tunnelling and groundwater is identified. In the both of 1st and 2nd Line the maximum sinkage, unequal sinkage and the lining stress from numerical analysis are within permission and the damage degree is appearing to be disregarded. But it enforces necessary Pre-grouting in order to minimize an actual tunnel face conduct and when the tunnel is excavated it is also necessary to minimize the outflow possibility.
Optimal Strengthening in RC Hollow Slab Bridges Using External Prestressing
Park, Kyung-Sik ; Choi, Se-Hyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 13, issue 6, 2009, Pages 204~211
In this study, the optimal method is applied to strengthening of RC hollow slab bridges using external prestressing. The Queen-post and King-post shapes are considered to find the effective tendon configurations. In order to achieve the objective rating factor, the optimal configurations and tendon forces are obtained by using the Sequential Unconstrained Minimization Technique (SUMT). The object function for optimal strengthening is constituted with the dimensionless function of material costs. The constraints are formulated by design specification and the rating factor. The validity of this study is presented by the analysis of the results of strengthening of the RC hollow slab bridges.