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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 15, Issue 6 - Nov 2011
Volume 15, Issue 5 - Sep 2011
Volume 15, Issue 4 - Jul 2011
Volume 15, Issue 3 - May 2011
Volume 15, Issue 2 - Mar 2011
Volume 15, Issue 1 - Jan 2011
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A Study on Mechanical Characteristics of Masonry Structure Constructed by Clay Brick with Lime Mortar
Yu, Hye Ran ; Kwon, Ki Hyuk ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 87~98
DOI : 10.11112/jksmi.2011.15.4.087
Clay bricks with lime mortar are recently popular since they are eco- and environment-friendly construction material being capable of air flow and moisture movement. However, there is little study on those of clay brick an lime mortar while relatively many researches on the structural characteristics of concrete bricks with cement mortar are available in Korea. Furthermore, the current Korean Building Code of masonry structures was established on the base of the Foreign Codes which does not reflect Korean masonry construction circumstance, such as material characteristics and section properties. To overcome these problems, experiments of masonry structures constructed using clay bricks with lime mortar were carried out to evaluate their structural characteristics such as, prism compressive strength, adhesive strength and diagonal tensile(shear) strength. Also this research compares the mechanical characteristics between clay bricks with lime mortar and concrete bricks with cement mortar to provide information that will be used for revisions of the domestic standards for masonry structures. As masonry structures constructed with clay bricks and lime mortar show different aspects over the ones constructed with concrete bricks and cement mortar, we suggest estimation equation of prism compressive strength and diagonal tensile strength on masonry structures constructed with clay bricks and lime mortar.
Design of LB-DECK Based on Performance Evaluation
Cho, Gyu Dae ; Lho, Byeong Cheol ; Cho, Hyun Chul ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 99~106
DOI : 10.11112/jksmi.2011.15.4.099
This study performed research for improvement on basic concept of PBD applying suitable design method before and after LB-DECK composition. According to study, in this case, before composition, it can reduce minuteness cracks by increasing bending tensile strength utilizing polymer concrete, can expect sensuous effect, improve durability as to low permeability, and was evaluated that can reduce covering depth according as it. Also, because LB-DECK baseplate that apply the empirical design method composite is superior load resistance ability than general baseplate, safety is increased, it is expected to secure constructibility and economic performance at the same time because reinforcement arrangement method and reinforcement amount are fixed even if span effective span is increased at ultimate strength design method application.
A Study on the Vibration Characteristics of Subway Structure by Train Load
Park, Sung Woo ; Park, Seung Su ; Hwang, In Baek ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 107~115
DOI : 10.11112/jksmi.2011.15.4.107
In this study, the vibration analysis of the underground box structures induced train movement is studied. In order to perform these analysis, dynamic data, which was measured when subway is in service, are gained by attaching accelerometers on the structure such as lower beam, lateral wall and upper slab. Also, accelerometers are attached on the lower beams and side walls of the gravel ballast and concrete ballast sections in order to compare vibration due to ballast materials. The vibration results of upper slabs and lower beams reveal that the vibration on the upper slabs is greater than the lower beams. Also, the results of the crack gauge on the upper slab show that crack width dose not change due to vibration, These means that the effect of the vibration on the structure is very limited. In order to evaluate the vibration of the structure, acceleration unit is converted to velocity unit comparing with the existing velocity data gained from the platforms.
Seismic Performance Evaluation of Hexagonal Blocks Infilled RC Frames
Chang, Kug Kwan ; Seo, Dae Won ; Ko, Tae Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 116~124
DOI : 10.11112/jksmi.2011.15.4.116
RC frames with unreinforced masonry infiledl walls are common in worldwide. Since infilled walls are normally considered as non-structural elements, their presence is often ignored by engineers. In this study, to improve the seismic performance of masonry walls, hexagonal block was developed and the influence of masonry infilled wall on the seismic performance of reinforced concrete(RC) frames that were designed in accordance with current code provisions without the consideration of earthquake loadings are investigated. Two 1/2 scale, single story, single bay, frame specimens were tested. The parameters investigated included that the strength of infilled wallls with respect to that of the lateral load history. The experimental results indicate that infilled walls can significantly improve the lateral stiffness and strength of RC frames. The lateral loads developed by the infilled frame specimen is higher than that of the bare frame. It also indicates that infilled walls can be potentially used to improve the performance of existing nonductile frames. For this purpose. methods should be developed to avoid irreparable damage and catastrophic failure.
Effect of Fiber Volume Fraction on Bond Properties of Structural Synthetic Fiber in Polypropylene Fiber Reinforced Cement Composites
Lee, Jin Hyeong ; Park, Chan Gi ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 125~135
DOI : 10.11112/jksmi.2011.15.4.125
The bond properties between polypropylene fiber reinforced cement composites and structural synthetic fiber have been investigated. in this paper. Three levels of polypropylene fibers volume fraction were used, 0.10%, 0.15%, and 0.20% in a series of Dog-bone pull out tests. The bond strength between structural synthetic fiber and polypropylene fiber reinforced cement composites increases with the volume fraction of polypropylene fiber, but the bond strength decreases above the amount of 0.20% by volume of polypropylene fiber reinforced cement composites. Also, the addition of polypropylene fiber a significant improved the interface toughness and the frictional resistance, The microstructure of structural synthetic fiber surface was investigated after the pullout test. The scratched of structural synthetic fiber increased with the polypropylene fiber volume fraction.
Assessment on Consolidation Material Function and Initial Stress for Soft Ground by Hydraulic Fill the at Southern Coast of Korea
Jeon, Je Sung ; Koo, Ja Kap ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 136~145
DOI : 10.11112/jksmi.2011.15.4.136
For a massive project related to building national industrial complexes on a soft ground applied to PVD after dredging and hydraulic fill, laboratory tests were carried out using undisturbed sample taken from various depth. Piezocone penetration and dissipation tests were carried out to assess horizontal coefficient of consolidation and initial stress in field. The ground consists of upper dredged fill and lower original clay layer having both similar marine clays. It should be, however, considered as multi-layered soft ground having different initial void ratio, initial water content, initial effective stress, and permeability and compressibility with directions. To assess initial stress of those soft layers in which have different stress history related to consolidation, CPTu test results, especially excess pore water pressure, were analyzed. It allows to find out distribution of excess pore water pressure and initial stress inner original clay layer.
Development of Network Level Management System of Road Facilities Based on the Asset Management Concept
Ji, Seung Gu ; Seo, Jong Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 146~154
DOI : 10.11112/jksmi.2011.15.4.146
Recently, the paradigm of social infrastructure investment has been changed from new construction to maintenance and management. As a consequence, the management and maintenance system of existing highway facilities needed an innovation involving the concept of asset management. This paper discusses the new facility management system suitable to local highway agencies. The new system incorporates asset management concept so that it can analyze the network level facility management solution and it can also improve the budget efficiency for local government. This paper also presents systematic method to integrate various facilities for management system.
Analysis of Behaviors of Concrete Strengthened with FRP Sheets and Steel Fibers Under Low-Velocity Impact Loading
Lee, Jin Young ; Kim, Mi Hye ; Min, Kyung Hwan ; Yoon, Young Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 155~164
DOI : 10.11112/jksmi.2011.15.4.155
In the case of impact loading test, measurement of the test data has difficulties due to fast loading velocity. In addition, the dynamic behaviors of specimens are distorted by ignoring local fracture. In this study, therefore, finite element analysis which considers local fracture and strain rate effect on impact load was performed by using LS-DYNA, an explicit analysis program. The one-way and two-way specimens strengthened with FRP Sheets and steel fibers were considered as analysis models. The results showed that the impact resistance of steel fiber reinforced concrete (SFRC) and ultra high performance concrete (UHPC) was enhanced. In the case of specimens strengthened with FRP Sheets, GFRP was superior to CFRP in the performance of impact resistance, and there was little effect of the FRP Sheet orientation. The reliability of this analysis model was verified by comparing with previous experimental results.
Optimal Sensor Allocation for Health Monitoring of Roller-Coaster Structure
Heo, Gwang Hee ; Jeon, Seung Gon ; Park, In Joon ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 165~174
DOI : 10.11112/jksmi.2011.15.4.165
This research aims at the optimal constitution of sensors required to identify the structural shortcoming of roller-coaster. In this research we analyzed the dynamic characteristics of roller-coaster by three dimensional FE modelling, decided on the appropriate location and number of sensors through optimal transducer theory, abstracted the mathematical value of modal features before and after damage on the basis of optimally placed and numbered sensors. and then presented it as a primary information about the basic structure which would be applied to damage estimation. As a target structure, the roller-coater at Seoul Children`s Grand Park was chosen and built as a model reduced by one twentieth in size. In order to consider the Kinetics features particular to the roller-coaster structure, we made an exact three-dimensional FE modelling for the model structure by means of Spline function. As for the proper location and number of sensors, it was done by applying EIM and EOT. We also estimated the damage from the combination of strength, flexibility, and model corelation after abstracting the value of modal features. Finally the optimal transducer theory presented here in this research was proved to be valid, and the structural damage was well identified through changes in strength and flexibility. As a result, we were able to present the optimal constitution of sensors needed for the analysis of dynamic characteristics and the development of techniques in dynamic characteristics, which would ultimately contribute to the development of health monitoring for roller-coaster.
An Experimental Study on the Bending Behaviour of Steel Grid Composite Deck
Shin, Hyun Seop ; Lee, Chin Hyung ; Park, Ki Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 175~184
DOI : 10.11112/jksmi.2011.15.4.175
To take advantage of reduced on-site construction periods and minimize traffic impacts various types of steel grid composite deck have been developed since 1930`s. Modular prefabricated unfilled grid decks permit a long-distance transportation and construction under unfavorable condition, for example, in mountainous regions due to its comparatively light-weighter structure than fully filled grid deck. In this study bending tests of unfilled grid decks for the deck member of various kinds of infrastructure are carried out, bending strength and behaviour of composite action are experimentally evaluated. In this bending test, design variables are considered, such as type of shear connection between steel grid and concrete slab, spacing between cross bars and thickness of concrete slab. Through test results bending strength and behaviour of composite action are evaluated, reference data for proper type of shear connection and other details of the deck, such as spacing between cross bars, are obtained.
Crack and Debonding Donitoring of RC Beams Strengthened with CFRP Plates
Yoon, Jun Ho ; Han, Jung Hun ; Cho, Doo Yong ; Park, Sun Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 185~192
DOI : 10.11112/jksmi.2011.15.4.185
A CFRP (Carbon Fiber-Reinforced Plastic) strengthening method being widely used to increase the load-carrying capacity of structures is very suitable for existing bridge structures. However, not only flexure and shear failures but also debonding failure might be additionally occured in reinforced concrete(RC) beams strengthened with the CFRP plates. The CFRP debonding failure would cause a brittle fracture of the beam. Therefore, health monitoring for the CFRP bonding condition is strongly required. In this study, a feasibility of the impedance-based damage detection method using PZT sensors was investigated through a series of experimental studies for realtime structural health monitoring(SHM) for the CFRP laminated concrete structures.
An Experimental Study on Field Application of Self-Compacting Concrete Using Recycled Fine Aggregate
Ryou, Jae Suk ; Song, Il Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 193~203
DOI : 10.11112/jksmi.2011.15.4.193
The purpose of this study, looking to which the recycled fine aggregates from waste concrete have a lot of problems as a material for structure purpose, is applying the recycled fine aggregate to Self-Compacting Concrete(In the reminder of this paper, it often referred to as SCC) by using the characteristic which the powder containing the recycled fine aggregates can increase strength and liquidity. In this study, that is, the recycled fine aggregate powder is appropriate for developing high strength(over 40 MPa) and liquidity(JSCE 2 grade), the characteristic of the SCC and it was increased the ratio of mixing the recycled fine aggregates emerging from waste concrete and the normal fine aggregates by 25%, making differential in total 5 levels and applied to SCC. After all, this study was reviewed the physical properties of the fresh concrete, analyzed the mechanical properties and durability of the hardening concrete and tried to ensure the possibility of utilizing the recycled fine aggregates as a material for SCC. As a result, this study reached a conclusion that among the 5-level replacement ratios of the physical, mechanical analysis and the durability characteristics, the normal fine aggregates could be applied up to a replacement ratio of 50% more than the recycled fine aggregates and resulted in a deterioration in performance the replacement ratio larger than 50%. It is judged that the applicability of the real structures should be followed up in order to check the possibility of applying the recycled fine aggregates to real life.
A Dynamic Analysis of PSC Box Bridge Varying Span Lengths for Increased Speeds of KTX
Oh, Soon Taek ; Lee, Dong Jun ; Shim, Young Woo ; Yun, Jun Kwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 204~211
DOI : 10.11112/jksmi.2011.15.4.204
A dynamic analysis procedure is developed to provide a better estimation of the dynamic responses of bridge during the passage of high speed railway vehicles. Particularly, a three dimensional numerical model including the structural interaction between high speed vehicles, bridges and railway endures to analyse accurately and evaluate with in-depth parametric studies for dynamic responses of various bridge span lengths running KTX railway locomotive up to increasing maximum speed(450km/h). Three dimensional frame element is used to model the simply supported pre-stressed concrete (PSC) box bridges for four span lengths(40~25m). Track irregularity employed as a stationary random process from the given spectral density functions and irregularities of both sides of the track are assumed to have high correlation. The high-speed railway vehicle (KTX) is used as 38-degree of freedom system. Three displacements (Vertical, lateral, and longitudinal) as well as three rotational components (Pitching, rolling, and yawing) are considered in the 38-degree of freedom model. The dynamic amplification factors are evaluated by the developed procedure under various traveling conditions, such as track irregularity camber, train speed and ballast. The dynamic analysis such as Newmark-
and Runge-Kutta methods which are able to analyse considering the dynamic impact factors are compared and contrasted.
Design Process of Fixing Pipe in Guide Pipe-Anchor System for Cable-Stayed Bridge
Hong, Sung Nam ; Park, Sun Kyu ; Park, Byung Gun ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 212~220
DOI : 10.11112/jksmi.2011.15.4.212
These days, many cable-stayed bridges were constructed in accordance with the trend in Korea. At the moment, construction technology of cable-stayed bridges has been remarkably developed but design technology still relies upon foreign technology very much. The cable anchor system that is one of key technologies of cable-stayed bridge brings powerful cable tension to produce local stress concentration and to disturb stress seriously, so for safety must be designed by a local detailed analysis is required. But without a clear design standard or design theory relying on F.E.M, and engineers don`t understand theoretical basic mechanism of cable anchor system. As a result, engineers can be lose their judgement. Accordingly, this study examined theoretical design flow of fixing pipe in guide pipe-anchor system and additional considerations, in accordance with design standards at home and abroad to keep them in order and to suggest supplementary design flow.
Punching Shear Strength of Deck Slabs Made of Ultra High Performance Concrete
Joh, Chang Bin ; Kim, Byung Suk ; Hwang, Hoon Hee ; Choi, Kyoung Kyu ; Choi, Sok Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 4, 2011, Pages 221~231
DOI : 10.11112/jksmi.2011.15.4.221
Thinner and lighter structural members can be designed by utilizing the high stiffness and toughness, and high compressive strength of UHPC(ultra high performance concrete), which reaches up to 200MPa. The punching shear capacity of UHPC was investigated in this paper aiming for the application of UHPC to bridge decks. Six square slabs were fabricated and punching shear test was performed under fixed boundary condition. Different thicknesses of test slabs, which were 40mm and 70mm, were selected. The shape ratio of loading plates were ranged between 1.0~2.5. 40mm thickness slabs showed longer softening region after the peak load and, on the other hand, 70mm thickness slabs revealed a more brittle shear failure. Experimental results were analyzed using various existing punching shear predicting equations. Ductal
equation and JSCE equation better predicted for 40mm slabs, and Harajli et al. equation and ACI-Ductal
equation better suited for 70mm slabs. Nevertheless generally they didn`t well predict the test results. A new punching shear equation which was derived based on the actual failure mechanism was proposed. The proposed equation appeared to better predict the punching shear strength of UHPC than other available equations.