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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 19, Issue 6 - Nov 2015
Volume 19, Issue 5 - Sep 2015
Volume 19, Issue 4 - Jul 2015
Volume 19, Issue 3 - May 2015
Volume 19, Issue 2 - Mar 2015
Volume 19, Issue 1 - Jan 2015
Selecting the target year
Evaluation on Flexural Performance of Precast Bridge Decks with Ribbed Connection
Shin, Dong-Ho ; Park, Se-Jin ; Oh, Hyun-Chul ; Kim, In-Gyu ; Kim, Young-Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 1~9
DOI : 10.11112/jksmi.2015.19.3.001
Due to the increasing number of deteriorated bridges worldwide, the importance of maintenance and replacement of existing bridges are being emphasized. Cast-in-place concrete deck which is mainly applied to deck replacement of existing bridges have problems such as deterioration concerns by initial crack, labor cost increase, difficulties of maintenance and replacement, construction time increase, and indirect cost increase by traffic congestion. On the contrary, a precast concrete deck is considered as an effective alternative because of its quality assurance and accelerated construction. The connection method ensuring the required strength and durability is especially important, because the connection part of the precast concrete deck is vulnerable to cracks and leakage. Therefore, this study proposes precast bridge decks with ribbed connection which are more improved than existing bridge deck joints, and flexural performance is verified through various parameter tests.
A Recent Research Summary on Smart Sensors for Structural Health Monitoring
Kim, Eun-Jin ; Cho, Soo-Jin ; Sim, Sung-Han ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 10~21
DOI : 10.11112/jksmi.2015.19.3.010
Structural health monitoring (SHM) is a technique to diagnose an accurate and reliable condition of civil infrastructure by collecting and analyzing responses from distributed sensors. In recent years, aging civil structures have been increasing and they require further developed SHM technology for development of sustainable society. Wireless smart sensor and network technology, which is one of the recently emerging SHM techniques, enables more effective and economic SHM system in comparison to the existing wired systems. Researchers continue on development of the capability and extension of wireless smart sensors, and implement performance validation in various in-laboratory and outdoor full-scale experiments. This paper presents a summary of recent (mostly after 2010) researches on smart sensors, focused on the newly developed hardware, software, and validation examples of the developed smart sensors.
Durability of Concrete Using Insulation Performance Improvement Materials
Park, Young-Shin ; Kim, Jung-Ho ; Kim, Se-Hwan ; Kim, Sang-Heon ; Jeon, Hyun-Kyu ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 22~29
DOI : 10.11112/jksmi.2015.19.3.022
In this study, we tested to develop and apply structural insulation performance improvement concrete to field, which had compressive strength in 24 MPa and thermal conductivity twice as much as normal concrete. After experiment about slump and air contents, combination product of Plain and calcined diatomite powder showed reduction of slump and air contents and combination product with micro foam cell admixture, we cannot find result of slump and air contents reduction. Unit weight of combination product with insulation performance improvement materials decreased more than that of Plain. In the test of compressive strength, compressive strength of insulation performance improvement concrete decreased more than that of Plain but was content with 24 MPa. thermal conductivity of insulation performance improvement concrete tended to decrease. Freezing and thawing resistance of insulation performance improvement concrete was similar to that of Plain. In carbonation resistance test, combination product with calcined diatomite powder showed the result which was similar to that of Plain. In carbonation resistance test, combination product with micro foam cell admixture showed a increase compared to that of Plain and length variation of combination product generally increased.
An Experimental Study on Evaluation Methods for Scaling Resistance of Cement Concrete Pavement
Lee, Hyeon-Gi ; Oh, Hong-Seob ; Sim, Jong-Sung ; Shim, Jae-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 30~38
DOI : 10.11112/jksmi.2015.19.3.030
In cold-climate regions, deicing agents is used for smooth traffic on the road due to freezing and snowdrift in winter. The use of de-icing salts has resulted in the accelerated scaling damage of concrete with salt damage under freezing and thawing condition. Scaling is the deterioration of concrete where in the paste-mortar structure delaminates in flakes from the surface of the concrete. Due to such damage, concrete pavement causes various problems such as early deterioration according to the decrease in the thickness of cover concrete and user's stability issues. Accordingly, various tests and evaluation methods have been suggested in order to evaluate these phenomena in other countries. However, there have been no regulations for the evaluation method in South Korea, and related studies are also very rare. Therefore, in this study, the evaluation methods proposed by each institution and country were investigated and the experiments were performed according to each regulation, followed by the comparison and analysis of the results. Furthermore, this study aims to suggest the optimized experimental method adopted to domestic field through the discussion of such experimental methods and results.
The Strength and Drying Shrinkage Properties of Alkali-activated Slag using Hard-burned MgO
Kim, Tae-Wan ; Jun, Yubin ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 39~47
DOI : 10.11112/jksmi.2015.19.3.039
In this study, the properties of strength and drying shrinkage of alkali-activated slag cement (AASC) with magnesium oxide (MgO) contents between 0 and 16 wt% were investigated. The ground granulated furnace blast slag (GGBFS) was activated by potassium hydroxide (KOH) and dosage of activator was 2M and 4M. The MgO was replaced with 2% to 16% of GGBFS by weight. The water-binder ratio (w/b) was 0.5. In the result, the higher MgO content leads to a slightly higher degree of reaction and thus to a higher compressive strength at all ages. The compressive strength and ultra sonic velocity (UPV) increased with increases MgO contents. The drying shrinkage of AASC was decreased as the contents of MgO increases. The results from SEM confirmed that there were densified reaction product of higher MgO content specimens.
A Preliminary Design for Hybrid Building System with Progressive Collapse Prevention Means
Choi, Ki-Bong ; Cho, Tae-Jun ; Kim, Seong-Soo ; Lee, Jin-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 48~54
DOI : 10.11112/jksmi.2015.19.3.048
In this study, we propose an innovative lateral force distribution building system between tall buildings by utilizing the difference of moment of inertia, resulting the reduction of lateral displacement and the lateral forces in terms of an alternative for the dense human and increased cost of lands in highly integrated city area. A successive collapse prevention means by providing additional bearing plate between connections is proposed. In addition to that, a more economical vibration reduction is expected due to the suggested tuned mass damper on the surface of spacial structure. In the considered verification examples, reduced drifts at the top location of the building systems are validated against static wind pressure loads and static earthquake loads. The suggested hybrid building system will improve the safety and reliability of the new or existing building system in terms of more than 30% reduced drift and vibration through the development of convergence of tall buildings and spatial structures.
A Parameter Study on the Shear Failure Behavior of Post-installed Set Anchor for Light Load
Um, Chan-Hee ; Yoo, Seung-Woon ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 55~63
DOI : 10.11112/jksmi.2015.19.3.055
Post-installed concrete set anchors are installed after the concrete hardened. These anchors increasing usage in development of construction equipment and flexible construction. The anchor loaded in shearing exhibits various failure modes such as steel failure, concrete failure, concrete pryout, depending on the shear strength of steel, the strength of concrete, edge distance and anchor interval, etc,. In this study, the objective is to investigate the effects of the variations like anchor embedment depth, edge distance and concrete strength on experimental and finite element analysis of shear failure behavior of post-installed concrete set anchor for light load embedded in concrete. The results of embedment depth experiments show that concrete strength has much affection on the shallow embedment depth. Concrete strength has no much affection with anchor interval and edge distance parameter and both experimental results occurred same failure mode. By comparing the experimental results that occurred steel failure mode show that as strong as concrete strength are the displacement results are small.
Highway Bridge Inspection Period Based on Risk Assessment
Lee, Il-Keun ; Kim, Dong-Hyawn ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 64~72
DOI : 10.11112/jksmi.2015.19.3.064
Risk Based Inspection (RBI) Period was proposed for highway bridges in Korea. Hazard factors affecting bridge condition deterioration were found by analyzing condition data from Highway Bridge Management System (HBMS). Certain level of correlations between those factors and condition deterioration were found. They are used to evaluate hazard score. Summarizing several hazard factors, final hazard is classified as three level;high, moderate, low. Vulnerability is assessed only by the current state of bridge. Then, risk matrix is suggested for inspection periods. Inspection periods of the bridges with grade C, D, and E are maintained the same as before. But, those of grade A and B with moderate and high hazard score are elongated to maximum 6 years while the maximum inspection period is three years at present. By adjusting inspection period according to risk assessment, it was shown that 27% of average inspection manpower can be saved.
Sensitivity Analysis on the Lateral Behavior of Diagrid Structure
Ahn, Keun-Woo ; Yang, Jae-Kwang ; Park, Sung-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 73~82
DOI : 10.11112/jksmi.2015.19.3.073
In evaluating lateral behavior on the seismic and wind load, the purpose of sensitivity analysis is to find critical variables and to identify characteristic response with variability of variables. The sensitivity analysis is very important in structural diagnosis, repair and reinforcement field. This study investigates the sensitivity by linear static analysis applying the TDA method in changing angles of diagrid braces on the same height structures. In case of mid rise model, under the seismic load, the brace member is determined as a major variable at
but a high rise model, under the wind load, has the brace member as a major variable at
. In addition, location of critical sensitivity on the mid rise model is distributed over middle section, while it is distributed lower section on the high rise model.
An Experimental Study on the Properties of Porous Concrete according to the Mix Factors and Compaction Load
Lim, Seo-Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 83~91
DOI : 10.11112/jksmi.2015.19.3.083
Porous concrete consists of cement, water and coarse aggregate and has been used for the purpose of decreasing the earth environmental load such as air and water permeability, sound absorption, etc. However, the physical and mechanical properties of porous concrete changes due to compaction load during construction. For such a reason, the purpose of this study is to investigate the physical and mechanical properties of porous concrete according to the kinds of binder, the ratio of water to binder and target void ratio. In particular, this study has been carried out to investigate the influence of compaction load on the void ratio, strength and coefficient of permeability. Aggregate used in this study are by-products generated during production of crushed gravel with a maximum size of 13mm. The results of this study showed that the target void ratio, the coefficient of permeability and compressive strength of porous concrete had a close relationship with the void ratio, and it will be possible that the void ratio is suggested by the mix design of porous concrete. The compressive strength of porous concrete was the highest at the content of the expansive admixture of 5% and compared to non-mixture, 10% mixture of silica fume improved compressive strength about 32%. And in the result of the study to change the compaction load, the compressive strength increased from the load of 15kN, the void ratio decreased from the load of 0.8kN, the coefficient of permeability decreased from the load 35kN, respectively.
An Experimental Study of Bond Stress between Concrete and Various Kinds of FRP Plank used as a Permanent Formwork
Park, Chan-Young ; Yoo, Seung-Woon ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 92~103
DOI : 10.11112/jksmi.2015.19.3.092
Development of new concrete bridge deck system with FRP plank using as a permanent formwork and the main tensile reinforcement recently has been actively conducted. Concurrent use as a reinforcing material and a permanent formwork, it is possible to reduce the construction time and construction costs than the usual concrete slab. In this study, an experiment was carried out for the bond stress between cast-in-place concrete and the type of FRP plank using as a permanent formwork. The interfacial fracture energy that can be one of the most important parameters were evaluated for adhesion performance and bond stress to know the characteristics of the failure mechanism of the adhesion surface. Interfacial fracture energy of normal concrete is 0.24kN/m of GF11 case, in the case of GF21, 0.43kN/m appears, in the case of CF11 and GF31, 0.44kN/m and 0.46kN/m respectively it appeared. In case of RFCON, 0.52kN/m appears from GF12, the CF12 and GF22, 0.51kN/m and 0.36kN/m appeared each case.
Evaluating the Depth of a Surface-opening Crack in Concrete Slabs using Surface wave Measurements
Kee, Seong-Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 104~112
DOI : 10.11112/jksmi.2015.19.3.104
Non-contact surface wave transmission (SWT) measurements are used to evaluate the depth of a surface-breaking crack in concrete slabs. The author propose a measurement model that includes an appropriate configuration of the source and receivers, and a transmission function for the given configuration. A series of numerical simulations using a 3D finite element model is used to obtain the transmission function. Then, validity of a proposed model is verified through experimental studies. Two air-coupled sensors are used to measured surface waves across surface-breaking cracks with varying depths from 0mm to 100mm with intervals of 10mm in a concrete slab (
) in laboratory. As a result, the proposed method is demonstrated as to be effective for charactering the depth of a surface-breaking crack in concrete bridge deck with an average error of 10%. A discussion on practical applications of the proposed method is also included in this article.
An Experimental Study on Strength and Ductility of Masonry Buildings Retrofitted by Metal Connectors
Park, Byung-Tae ; Kwon, Ki-Hyuk ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 113~121
DOI : 10.11112/jksmi.2015.19.3.113
Building using masonry accounts for most of the smaller houses in Korea but due to brittle behavior and low ductility the frequency of usage has decreased in recent years. Despite this, this form of building has been gaining attention overseas for its low cost in construction and environment-friendliness of the materials. As such, many studies are being conducted to resolve the disadvantages in structure. This study produced an specimen for masonry-filled wall and the intersection to confirm the difference in structural movement depends on the existence or lack of expansion joint and verified the reinforcement effect from inserting a connecting steel item (steel plate, stainless steel twist bar). The experiment results show that the specimen with a steel plate inserted saw an increase in durability and an improvement in the strength of the specimens, while the specimen that had stainless steel twists bar inserted saw an increase in ductility that did not cause brittle failure, indicating that the reinforcement effects of inserting a connecting steel item are effective.
Effective Compressive Strength of Corner Columns with Intervening Normal Strength Slabs
Lee, Joo-Ha ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 122~129
DOI : 10.11112/jksmi.2015.19.3.122
In this study, a prediction model for the effective compressive strength of corner columns with intervening normal strength concrete slabs was developed. A structural analogy between high-strength concrete column-normal strength concrete slab joint and brick masonry was used to develop the prediction model. In addition, the aspect ratio of slab thickness to column dimension was considered in the models. The reliability of the new prediction model was evaluated by comparison with experimental results and its superiority was demonstrated by comparison with previous models proposed by design codes and other researchers. As a result, with average test-to-predicted ratios of 1.09, a standard deviation of 0.15, the newly developed equation provided superior predictions in terms of accuracy and consistency over all of the existing effective strength prediction approaches including KCI structural concrete design code (2012).
Experimental Study on Lateral Pressure Characteristics of a Formwork for High-Flowable and High-Strength Concrete
Ko, Young-Kon ; Kim, Cheol-Hwan ; Hwang, Jae-Woong ; Yi, Seong-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 130~138
DOI : 10.11112/jksmi.2015.19.3.130
In this study, to examine the application of cast-in-place of high-flowable and high-strength concrete, an experimental study on the lateral pressure of a formwork was preformed. The experiment specimens, which have different casting height and casting speed were prepared. The lateral pressure and the change of temperature from test specimens were obtained. The maximum lateral pressure was shown to lateral pressure of fresh concrete. Immediately after placing, the lateral pressure starts to decrease and, after 12 hours, it showed a stabilization. The decreased tend of the lateral pressure was similar with normal-strength concrete, which appears stabilization after 3~4 hours from casting completion. The more casting speed is fast, the more maximum lateral pressure is high, but pressure reduction with the lapse of time was nearly similar. In addition, it was found that there was no direct relation between the hydration heat and the lateral pressure reduction.
The Ductile Behavior Test of Ultra High Performance Fiber Reinforced Concrete Rectangular Beam by the Combination of the Fiber and Group of Reinforcing Bars
Han, Sang-Mook ; An, Jin-Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 139~148
DOI : 10.11112/jksmi.2015.19.3.139
The purpose of this paper is to induce the ductile behavior of the UHPFRC member after the peak load by using the bundle of longitudinal reinforcing bar as a substitute for steel fiber. Experiments on the flexural behavior of the Ultra High Performance Concrete rectangular beam with the combination of the steel fiber and longitudinal reinforcing bar were carried out. The volume fractions of steel fiber are 0%, 0.7%, 1%, 1.5%, 2% and the reinforcement ratios of longitudinal reinforcing bar which induce the ductile behavior are 0.0036, 0.016, 0.028 and 0.036. 15 UHPC beams were made with the combination of these test factors. Not only steel fiber but also bundle of longitudinal reinforcing bar has the effect to induce ductile behavior of UHPC structural member. The combination of 0.7% volume fraction of steel fiber and 0.028 reinforcement ratio showed the most economic combination. The relationship of load-deflection, strain variation of the concrete and the crack pattern indicate the usefulness of the bundle of the longitudinal bar which has small diameter with close arrangement each other.
Effect of Surface Preparation and Curing Condition on the Interfacial Bond Strength between Ultra High Performance Concrete and Normal Strength Concrete
Kang, Sung-Hoon ; Hong, Sung-Gul ;
Journal of the Korea institute for structural maintenance and inspection, volume 19, issue 3, 2015, Pages 149~160
DOI : 10.11112/jksmi.2015.19.3.149
This study reports the interfacial bond strength between Ultra High Performance Concrete (UHPC) and Normal Strength Concrete (NSC). While previous studies have focused on the interfacial strength between NSC substrate and UHPC overlay, this study use precast UHPC for enhanced constructability and replacement of formwork. The factors affecting the interface strength are comprehensively reviewed. It can be classified into: interface shape, degree of hardening and moisture condition of UHPC before combining with NSC, and curing condition of composite materials. Conducted experiments verify the effects of each factor on the interface strength and, accordingly show different failure modes. In particular, a new failure mode of the failure of a part of UHPC was firstly found in the case of sample with rough interface between UHPC and NSC. The other factors of the degree of hardening and the moisture and curing conditions of UHPC were discussed. This research will provide a valuable foundation to utilize the UHPC as a composite material.