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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 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
Selecting the target year
An Experimental Assessment on the Structural Behavior of Bolt Connected Deep Corrugated Steel Plate
Oh, Hong Seob ; Lee, Ju Won ; Jun, Beong Gun ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 79~87
DOI : 10.11112/jksmi.2011.15.3.079
Deep corrugated steel plate structure has more compressive force and flexibility in bending behavior than short span structure. Asymmetric earth pressure distribution has occurred during construction. Ultimate strength and moment in domestic area, having superior ability at bending strain has been examined in this study. Based on the result of the study preceded, performance of Deep corrugated steel plate specimen has been evaluated by comparing increase of strength according to the increase of reinforcement content in bolt connections and failure mode of specimen.
Seismic Performance Evaluation of Masonry Walls Retrofitted with Semi-buried Lattice Reinforcement
Kim, Sang Hyo ; Choi, Moon Seock ; Park, Se Jun ; Ahn, Jin Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 88~98
DOI : 10.11112/jksmi.2011.15.3.088
Masonry structure is a style of building which has been widely applied as residential facilities of low and middle stories, commercial and public facilities etc. But it is possible to destroy by loss of adhesive strength or sliding when lateral forces, such as earthquake, occurs. This study proposes a seismic retrofit method for masonry structure and its seismic performance is demonstrated by shaking table test. Two specimens per each shaking direction were made, having out-of-plane(weak axis) and in-plane(strong axis) direction. External load of 1 ton was also applied for each specimen during the test, to model the behavior of reinforced masonry wall. As a result of shaking table tests, it is shown that the specimen applying the proposed seismic retrofit method showed acceptable behaviors in both of Korea building design criteria(0.14g) and USA seismic criteria suggested by IBC(0.4g). However, it was observed that stiffness of the specimen toward out-of-plane was rapidly decreasing when seismic excitations over 0.14g were loaded. In comparison of relative displacements, maximum relative displacement of specimens which were accelerated toward out-of-plane with 0.4g at once was 29~31% of maximum relative displacement when specimens were gradually accelerated from 0.08g to 0.4g, while the maximum relative displacement of specimens accelerated toward in-plane has similar value in both cases. Therefore, it is concluded that the wall accelerated toward out-of-plane is more affected by hair crack or possible fatigues caused by seismic excitation.
Centrifuge-Shaking Table Test for Seismic Performance Evaluation of Subway Station
Kim, Jin Ho ; Shin, Min Jung ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 99~105
DOI : 10.11112/jksmi.2011.15.3.099
When a certain magnitude earthquake occurs, serious damage for human and properties is a major concern for most of the subway stations which were not applied for earthquake resistant design. Consideration and experimental verification for ground and structural behavior based on soil-structure interaction relation are required to evaluate seismic performance of the subway station as embedded structures. For 1/60 scaled subway station model, centrifuge modeling shaking table test is performed using Kobe and Northridge earthquakes. Compare to displacements and moments of the underground and structure obtained by soil response analysis and response displacement method based on experimental results, this paper shows how to evaluate seismic performance of subway station.
A New Methodology for Seismic Capacity Evaluation of Low-rise R/C Buildings
Lee, Kang Seok ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 106~115
DOI : 10.11112/jksmi.2011.15.3.106
This study proposed a new methodology for seismic capacity evaluation of low-rise reinforced concrete (RC) buildings based on non-linear required spectrum. In order to verify the reliability of the proposed method, relationships between results obtained using the proposed method and the non-linear dynamic analyses were investigated. Compared with the seismic protection index (Es=0.6) defined in the Japanese Standard, the applicability of the method was also estimated. Research results indicate that the method proposed in this study compares reasonably well with the detailed evaluation methods. Using the seismic evaluation method developed in this study, the seismic capacity category and earthquake damage degree of low-rise RC buildings corresponding to a specific earthquake level can be effectively estimated.
A Study on the Ubiquitous Wireless Tilt Sensors's Application for Measuring Vertical Deflection of Bridge
Jo, Byung Wan ; Yoon, Kwang Won ; Kim, Young Ji ; Lee, Dong Yoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 116~124
DOI : 10.11112/jksmi.2011.15.3.116
In this study, a new method to estimate the bridge deflection is developed by using Wireless Tilt Sensor. Most of evaluations of structural integrity, it is very important to measure the geometric profile, which is a major factor representing the global behavior of civil structure, especially bridges. In the past, Because of the lack of appropriate methods to measure the deflection curve of bridges on site, the measurement of deflection had been done restrictly within just a few discrete points along the bridge. Also the measurement point could be limited to locations installed with displacement transducers. So, in this study, the deflection of the structure was measured by wireless tilt sensor instead of LVDT(Linear Variable Differential Transformer). Angle change of tilt sensor shows structural behavior by the change of the resistor values which is presented to voltage. Moreover, the maximum deflection was calculated by changing the deflection angle which was calculated as V(measured voltage)
F(factor) to deflection. The experimental tests were carried out to verify the developed deflection estimation techniques. Because the base of tilt measuring is the gravity, uniform measurement is possible independent of a measuring point. Also, measuring values were showed very high accuracy.
A Study on Long-Term Mechanical Properties and Durability in Metakaolin Concrete Bridge Deck
Yang, Eun Ik ; Kim, Myung Yu ; Yang, Joo Kyoung ; Park, Hae Geun ; Choi, Yoon Suk ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 125~133
DOI : 10.11112/jksmi.2011.15.3.125
The requirement for durability of concrete bridge deck is increasing as the deterioration for the concrete bridge deck exposed to severe environment has been increased. For this reason, the concern about high-durable concrete is being high. Recently, a metakaolin is highly spotlighted as new admixture because its strength and durability are equivalent to silica fume. On the other hands, there are few researches for the metakaolin concrete bridge deck in domestic. So many various long-term data on the mechanical property and durability is needed to apply metakaolin concrete at the concrete bridge deck construction field. This study is aim to evaluate the long-term mechanical properties and durability of metakaolin concrete bridge deck with curing age. Mechanical properties are estimated by the compressive and flexural strength, and the drying shrinkage, the chloride resistance, the scaling, and freezing and thawing characteristics are compared with curing age. According to the results, when the metakaolin concrete is used, the development of compressive and flexural strength proceed in both the early and old ages. It is also improved the resistance of chloride penetration, freezing and thawing in concrete. It was showed that replacement of metakaolin was efficient for the reduction of the drying shrinkage.
Multiple Damage Detection of Pipeline Structures Using Statistical Pattern Recognition of Self-sensed Guided Waves
Park, Seung Hee ; Kim, Dong Jin ; Lee, Chang Gil ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 134~141
DOI : 10.11112/jksmi.2011.15.3.134
There have been increased economic and societal demands to continuously monitor the integrity and long-term deterioration of civil infrastructures to ensure their safety and adequate performance throughout their life span. However, it is very difficult to continuously monitor the structural condition of the pipeline structures because those are placed underground and connected each other complexly, although pipeline structures are core underground infrastructures which transport primary sources. Moreover, damage can occur at several scales from micro-cracking to buckling or loose bolts in the pipeline structures. In this study, guided wave measurement can be achieved with a self-sensing circuit using a piezoelectric active sensor. In this self sensing system, a specific frequency-induced structural wavelet response is obtained from the self-sensed guided wave measurement. To classify the multiple types of structural damage, supervised learning-based statistical pattern recognition was implemented using the damage indices extracted from the guided wave features. Different types of structural damage artificially inflicted on a pipeline system were investigated to verify the effectiveness of the proposed SHM approach.
Time Dependent Evaluation of Corrosion Free Life of Concrete Tunnel Structures Based on the Reliability Theory
Pack, Seung Woo ; Jung, Min Sun ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 142~154
DOI : 10.11112/jksmi.2011.15.3.142
This study predicted the probability of corrosion initiation of reinforced concrete tunnel boxes structures using the Monte Carlo Simulation. For the inner wall and outer wall in the tunnel boxes, exposed to airborne chloride ion and seawater directly respectively, statistical values of parameters like diffusion coefficient D, surface chloride content
, cover depth c, and the chloride threshold level
were examined from experiment or literature review. Their average values accounted for
, 3.0% by weight of cement, 94.7mm and 45.5mm for outer wall and inner wall, respectively, and 0.69% by weight of cement for D,
, c, and
, respectively. With these parametric values, the distribution of chloride contents at rebar with time and the probability of corrosion initiation of the tunnel boxes, inner wall and outer wall, was examined by considering time dependency of chloride transport. From the examination, the histogram of chloride contents at rebar is closer to a gamma distribution, and the mean value increases with time, while the coefficient of variance decreases with time. It was found that the probability of corrosion initiation and the time to corrosion were dependent on the time dependency of chloride transport. Time independent model predicted time to corrosion initiation of inner wall and outer wall as 8 and 12 years, respectively, while 178 and 283 years of time to corrosion was calculated by time dependent model for inner wall and outer wall, respectively. For time independent model, the probability of corrosion at 100 years of exposure for inner wall and outer wall was ranged 59.5 and 95.5%, respectively, while time dependent model indicated 2.9 and 0.2% of the probability corrosion, respectively. Finally, impact of
, including values specified in current codes, on the probability of corrosion initiation and corrosion free life is discussed.
A Study on the Evaluation of Design Compressive Strength and Flexural Strength of the Improved Deep Corrugated Steel Plate
Sim, Jong Sung ; Lee, Hyeon Gi ; Kang, Tae Sung ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 155~162
DOI : 10.11112/jksmi.2011.15.3.155
The structures that use the bridge plates are considered to have advantages such as short work term, excellent economical efficiency and low maintenance cost. Bridge plates are being widely used for water ducts and eco-corridors as replacements of reinforced concrete ducts. Bridge plates are deep and have greater pitch as compare to conventionally deep corrugated steel plate. They are expected to be increasingly used in the future. The structures that use bridge plates have two forms, such as arch type and box type. The arch type structures are designed based on the compressive strength, and the box type structures, based on the moment in the plate member. In this study, the ultimate strength and moment strength of the connection part of the specimens were examined by their thickness. Static and bending tests used to evaluate the performance of bridge plate. Finally, These results were used in the design process.
A Study on the Static Behavior of GFRP Bridge Deck
Ji, Hyo Seon ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 163~170
DOI : 10.11112/jksmi.2011.15.3.163
A concept of Modular GFRP(Glass Fiber Reinforced Polymer) deck panel was proposed for bridge decks. The modular GFRP bridge deck system is comprised of main unit module and connector unit module with GFRP flanges and web. Its structural performance under static loading was evaluated and compared with the LUSAS finite element predictions. It was found that the presented GFRP modular panel was very efficient for use in bridges. The failure mode of the proposed GFRP deck was similar when compared with that of commercial other GFRP decks developed.
Non-contact Impact-Echo Based Detection of Damages in Concrete Slabs Using Low Cost Air Pressure Sensors
Kim, Jeong-Su ; Lee, Chang Joon ; Shin, Sung Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 171~177
DOI : 10.11112/jksmi.2011.15.3.171
The feasibility of using low cost, unpowered, unshielded dynamic microphones is investigated for cost effective contactless sensing of impact-echo signals in concrete structures. Impact-echo tests on a delaminated concrete slab specimen were conducted and the results were used to assess the damage detection capability of the low cost system. Results showed that the dynamic microphone successfully captured impact-echo signals with a contactless manner and the delaminations in concrete structures were clearly detected as good as expensive high-end air pressure sensor based non-contact impact-echo testing.
Application of Discoll Method to Blend Fine Aggregate for Concrete
Lee, Seong Haeng ; Ham, Hyeong Gil ; Kim, Tae Wan ; Oh, Yong Ju ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 178~185
DOI : 10.11112/jksmi.2011.15.3.178
Recently depletion of natural resources makes a deficiency of sand aggregation in the concrete works. In this study, the quality characteristics of concrete and aggregate according to blending fine aggregate in the river sand and the crash sand was analyzed by Normal method and Driscoll method which has used mixing of fine aggregate for asphalt mostly. Application of Discoll method to blend fine aggregate for concrete was studied in the first step to blend fine aggregates concrete. The fineness modulus, grading, slump, air content and compressive strength were tested by the two method, the results of Driscoll method was very similar to degree of err limits in comparison with those of Normal method in the same condition. As a result, Driscoll method is reasonable to use the fine aggregates mixture for concrete in river sand and crash sand.
Enhancing Seismic Performance of Exterior R.C. Beam-Column Connections Using Headed Bars
Shin, Hyun Oh ; Yang, Jun Mo ; Yoon, Young Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 186~194
DOI : 10.11112/jksmi.2011.15.3.186
The reinforced concrete beam-column connections are in lack of constructability and are likely to show anchorage failure because of the complex details of joint regions. Under seismic loads, a destruction of the column or the beam-column joint leads to collapse of the whole structures. For this reason, the safety of structures has to be guaranteed by following procedures which are based on the strong column-weak beam design concept: 1) failure of beam by generating plastic hinge in the beam maintained a certain distance from the surface of column, 2) failure of column or beam-column joint. In this study, headed bars were used as longitudinal reinforcements of beam and joint reinforcements in order to improve the strength and constructability of joint and to relocate plastic hinge. The finite element analyses (FEAs) were performed to the reinforced concrete beam-column joints utilizing headed bar reinforcements. To verify the availability of the analysis models, the FEAs for experimental tests performed by previous researchers were conducted and compared with the experimental results. Additional variables are also considered to confirm the excellence of headed bars. Analysis results indicate that the constructability of beam-column connections can be improved by using headed bars for the full anchorage of longitudinal reinforcements of beam under similar structural performance. In addition, the plastic hinge was relocated to the intended place by using headed bars as joint reinforcements. Under cyclic displacement loading, the energy dissipation capacity and ultimate stress were increased and the decrease in stiffness was minimized.
Effects of Inelastic Demand Spectrum on Seismic Capacity Evaluation of Curved Bridge by Capacity Spectrum Method
Cho, Sung Gook ; Park, Woong Ki ; Joe, Yang Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 15, issue 3, 2011, Pages 195~206
DOI : 10.11112/jksmi.2011.15.3.195
The capacity spectrum method(CSM) has been more frequently used as a tool to evaluate the seismic capacity of the structure. Many formulas of strength reduction factors(SRF) have been proposed and adopted to generate the inelastic demand spectrum for the CSM. This study evaluates the impacts of the type of the SRF on the inelastic demand spectrum and finally on the seismic response displacement of curved bridge. For the purpose, the several existing formulas of SRFs were comparatively investigated through the case study. Curved bridges with different subtended angles were selected and the displacements of the bridge piers were estimated by using the different formulas of SRFs. Nonlinear time history analyses were also performed for the validation purpose of the CSM results. According to study results, the CSM may generate the larger displacement responses than the actual behaviors for the curved bridge with larger subtended angles. Though many methods have been suggested to generate the inelastic demand spectrum for CSM, they might not give noticeable differences in inelastic displacement of the bridge pier.