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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 20, Issue 5 - Sep 2016
Volume 20, Issue 4 - Jul 2016
Volume 20, Issue 3 - May 2016
Volume 20, Issue 2 - Mar 2016
Volume 20, Issue 1 - Jan 2016
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Composite Behavior and Shear Strength of DH-Beams with Steel Deck Plates
Moon, Jeong-Ho ; Oh, Young-Hun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 1~9
DOI : 10.11112/jksmi.2016.20.3.001
The purpose of this study is to examine the shear strength and structural performance of DH-Beams. The DH-Beam construction method uses thin steel plates as form-works and structural elements. Steel plates and rebars for DH-Beams were prefabricated at factory and then erected before casting concrete at construction sites. In this study, the contribution of steel plates to the shear strength of DH-Beam was evaluated since the plates were expected to work as reinforcements. Five test specimens were made for experimental and analytical studies. They consisted of two DH-Beams for the positive loading test and two DH-Beams for the negative loading test and a RC beam for the comparison purpose. Test results on DH-Beams were compared with design equations and the RC beam test result. It was proven that DH-Beams demonstrated the good shear behavior showing sufficient strengths and deformation capacities. Nonlinear analyses with test specimens were also used to evaluate the contribution of DH plates to strengths. Analytical models included various cases such as beams with lateral plates only or beams without any plates. These analyses also showed that steel plates can contribute to the enhancement of shear strength of DH-Beams. Based on experimental and analytical studies, it was concluded that steel plates of DH-Beams can be used as good shear reinforcements.
Laboratory Validation of Bridge Finite Model Updating Approach By Static Load Input/Deflection Output Measurements
Kim, Sehoon ; Koo, Ki Young ; Lee, Jong-Jae ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 10~17
DOI : 10.11112/jksmi.2016.20.3.010
This paper presents a laboratory validation of a new approach for Finite Element Model Updating(FEMU) on short-span bridges by combining ambient vibration measurements with static load input-deflection output measurements. The conventional FEMU approach based on modal parameters requires the assumption on the system mass matrix for the eigen-value analysis. The proposed approach doesn't require the assumption and even provides a way to update the mass matrix. The proposed approach consists of two steps: 1) updating the stiffness matrix using the static input-deflection output measurements, and 2) updating the mass matrix using a few lower natural frequencies. For a validation of the proposed approach, Young's modulus of the laboratory model was updated by the proposed approach and compared with the value obtained from strain-stress tests in a Universal Testing Machine. Result of the conventional FEMU was also compared with the result of the proposed approach. It was found that proposed approach successfully estimated the Young's modulus and the mass density reasonably while the conventional FEMU showed a large error when used with higher-modes. In addition, the FE modeling error was discussed.
A Method Estimating Displacement using Measured Strain Response of Simply Supported Girder Bridges
Jeon, Jun-Chang ; Lee, Hee-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 18~24
DOI : 10.11112/jksmi.2016.20.3.018
This study presents a simple method which can estimate displacement using measured strain response of simply supported girder bridges. The basic concept of the present method is derived from a relation between displacement and strain, and is generalized by introducing analytical tool. Static and dynamic laboratory test are conducted on simply supported plate which is designed to respond dynamically similar to actual bridges to experimentally verify the present method, and displacement and strain are measured at the midpoint of specimen. Displacement estimated by using measured strain is well agreed with measured one. This study demonstrates that the present method is suitable for estimating displacement of real simply supported bridge, in which the installation of a displacement transducer at the fixed reference point is difficult.
Pile-cap Connection Behavior Dependent on the Connecting Method between PHC pile and Footing
Bang, Jin-Wook ; Oh, Sang-Jin ; Lee, Seung-Soo ; Kim, Yun-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 25~32
DOI : 10.11112/jksmi.2016.20.3.025
The pile-cap connection part which transfers foundation loads through pile body is critical element regarding flexural and shear force because the change of area, stress, and stiffness occurs in the this region suddenly. The purpose of this study is to investigate the structural behavior of pile-cap connection dependent on fabrication methods using conventional PHC pile and composite PHC pile. A series of test under cyclic lateral load was performed and the connection behavior was discussed. From the test results, it was found that the initial rotational stiffness of pile-cap connection was affected by the length of pile-head inserted in footing and the location of longitudinal reinforcing bars. The types of pile and location of longitudinal reinforcing bars governed the behavior of pile-cap connection regarding load-carrying capacity, ductility, and energy dissipation.
Investigation of Material Characteristics of Reinforced Concrete Beam After Exposure to Fire Test
Ju, Min-Kwan ; Park, Cheol-Woo ; Oh, Ji-Hyun ; Seo, Sang-Gil ; Shim, Jae-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 33~41
DOI : 10.11112/jksmi.2016.20.3.033
Concrete is inherently a good fire-resistance material among all other constrcution materials and protects the reinforcing steel inside. This study investigates the material characteristics of concrete and steel bar inside the full scale reinforced concrete(RC) beam exposed to fire test. The fire test specimen was 4 m long and the test was conducted under no loading condition following KS F 2257. Fire source is simulated by ISO 834 and number of thermocouples were installed to measure temperature variation of surfaces and inside of the beam. The measured compressive strength of cored specimen, which was exposed to fire test, was 11 MPa, about 66% lower than the strength before exposure. The yielding strength of steel bar also decreased about 75 MPa, about 17% lower. The measured temperature of protected steel bar was around
, the critical limit, after 4 hour exposure.
Kalman Filter-based Data Recovery in Wireless Smart Sensor Network for Infrastructure Monitoring
Kim, Eun-Jin ; Park, Jong-Woong ; Sim, Sung-Han ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 42~48
DOI : 10.11112/jksmi.2016.20.3.042
Extensive research effort has been made during the last decade to utilize wireless smart sensors for evaluating and monitoring structural integrity of civil engineering structures. The wireless smart sensor commonly has sensing and embedded computation capabilities as well as wireless communication that provide strong potential to overcome shortcomings of traditional wired sensor systems such as high equipment and installation cost. However, sensor malfunctioning particularly in case of long-term monitoring and unreliable wireless communication in harsh environment are the critical issues that should be properly tackled for a wider adoption of wireless smart sensors in practice. This study presents a wireless smart sensor network(WSSN) that can estimate unmeasured responses for the purpose of data recovery at unresponsive sensor nodes. A software program that runs on WSSN is developed to estimate the unmeasured responses from the measured using the Kalman filter. The performance of the developed network software is experimentally verified by estimating unmeasured acceleration responses using a simply-supported beam.
Reinforcement Effects using V Type External Strands on PSC I Girder Bridges
Back, Seung-Chul ; Song, Jae-Ho ; Kim, Haeng-Bae ; Kim, Suk-Su ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 49~57
DOI : 10.11112/jksmi.2016.20.3.049
This study intended to analyze reinforcement effects of PSC I girder bridges to which prestresses are introduced using V type of external strands. So that series of bridge loading tests are carried out on existing PSC I girder bridge for the cases of before-reinforcement and reinforcement. The measured results from tests being analyzed and compared with the ones from MIDAS structural analyzing program, the reinforcing effects of the reinforcement system adopted in this study were investigated. It is found out that when the V type systems are applied to the bridge girders, the slope of load distribution factor curves become lower improving soundness of bridge upper structure. And also it is confirmed that the reinforcement system in this study can be taken as helpful for improvement of both flexural and shear ability of PSC I girder bridges, as well as dynamic behavior. Furthermore it is found when the elastic pads are applied to the system, dynamic reinforcing effects are maximized.
Inelastic Seismic Response Control of the RC Framed Apartment Building Structures Using Exterior-Installed Kagome Damping System
Hur, Moo-Won ; Chun, Young-Soo ; Lee, Sang-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 58~65
DOI : 10.11112/jksmi.2016.20.3.058
Various passive energy dissipation systems have been proposed and widely applied to real building structures under seismic load due to their high energy-dissipation potential and low cost for installation and maintenance. This paper presents nonlinear dynamic analysis results of the effectiveness of exterior-installed Kagome damping system(EKDS) in passively reducing seismic response. Kagome damping system proposed by previous studies has isotropic and bi-linear hysteretic characteristics and the installation configuration is newly presented in this study. The 15 and 20 story RC framed apartment buildings are used for verifying the effectiveness of the EKDS. The stiffness ratio of the damper supporting column to the original building, the number of the dampers, and the installed stories were considered as design parameters. Numerical results demonstrated that the EKDS were very effective in reducing both the two horizontal directional seismic responses by just using smaller number of exterior-installed damping system when compared to the traditional one-directional inter-story installed damping systems.
The Fundamental Characteristics for Mix Proportion of Multi-Component Cement
Kim, Tae-Wan ; Jeon, Jae-Woo ; Seo, Min-A ; Jo, Hyeon-Hyeong ; Bae, Su-Yeon ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 66~74
DOI : 10.11112/jksmi.2016.20.3.066
The aim of this research work is to investigate the mix proportion of multi-component cement incorporating ground granulated blast furnace(GGBFS), fly ash(FA) and silica fume(SF) as an addition to cement in ternary and quaternary combinations. The water-binder ratio was 0.45. In this study, 50% and 60% replacement ratios of mineral admixture to OPC was used, while series of combination of 20~40% GGBFS, 5~35% FA and 0~15% SF binder were used for fundamental characteristics tests. This study concern the GGBFS/FA ratio and SF contents of multi-component cement including the compressive strength, water absorptions, ultrasonic pulse velocity(UPV), drying shrinkage and X-ray diffraction(XRD) analysises. The results show that the addition of SF can reduce the water absorption and increase the compressive strength, UPV and drying shrinkage. These developments in the compressive strength, UPV and water absorption can be attributed to the fact that increase in the SF content tends basically to consume the calcium hydroxide crystals released from the hydration process leading to the formation of further CSH(calcium silicate hydrate). The strength, water absorption and UPV increases with an increase in GGBFS/FA ratios for a each SF contents. The relationship between GGBFS/FA ratios and compressive strength, water absorption, UPV is close to linear. It was found that the GGBFS/FA ratio and SF contents is the key factor governing the fundamental properties of multi-component cement.
Analytical Study for Performance Evaluation of Studs for Steel Plate Concrete (SC) Walls subjected to Forced Vibration
Yi, Seong-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 75~82
DOI : 10.11112/jksmi.2016.20.3.075
This study analytically reviewed the behavior of steel plate concrete (SC) walls subjected to forced vibration to investigate the effects of shape and arrangement spacing of studs on the behavior spacing of studs in SC wall were carried out. From the analyses, it was noted that the damping ratio obtained from the time history analyses showed overall high value in Half-power Bandwidth method and the lowest value in Fitted Exponential Curve method. And, in half of the design strength, the damping ratio presented approximately 3.0~4.2% and, in the design strength, it was approximately 4.1~5.2%. When the developed studs were used, the damping ratio was reduced slightly and it did not show consistent results between DS1 and DS2. When the distance between the studs increases more than necessary, it was also confirmed that the natural frequency was reduced and the damping ratio was increased.
Evaluation of the Seismic Performance for Domestic URM Buildings Using Nonlinear Dynamic Analysis
Baek, Eun-Rim ; Kim, Jung-Hyun ; Lee, Sang-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 83~92
DOI : 10.11112/jksmi.2016.20.3.083
The purpose of this study is to evaluate the seismic performance of domestic unreinforced masonry(URM) buildings using nonlinear dynamic analysis. For that, the nonlinear hysteresis models suggested in the previous research were validated for the dynamic analysis. The results of the shaking table test were compared with the dynamic analysis results using the suggested nonlinear hysteresis models. As a result, the nonlinear hysteresis models were expected to be applicable to the dynamic analysis of URM buildings. Based on the models, the dynamic analysis of domestic URM buildings varying the number of stories and opening ratio was carried out. The analysis results showed that most of the domestic URM buildings were very vulnerable to design earthquake in Korea.
Structural Behavior of Steel Fiber-Reinforced Concrete Beams with High-Strength Rebar Subjected to Bending
Yang, In-Hwan ; Kim, Kyoung-Chul ; Joh, Changbin ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 93~102
DOI : 10.11112/jksmi.2016.20.3.093
The purpose of this paper is to investigate the flexural behavior of high-strength steel fiber-reinforced concrete beams with compressive strength of 130 MPa. The paper presents experimental research results of steel fiber-reinforced concrete beams with steel fiber content of 1.0% by volume and steel reinforcement ratio of less than 0.02. Both of normal-strength rebar and high-strength rebar were used in the test beams. Modeling as well as compressive and tensile strength test of high-strength steel fiber-reinforced concrete was performed to predict the bending strength of concrete beams. Tension modeling was performed by using inverse analysis in which load-crack mouth opening displacement relationship was considered. The experimental results show that high-strength steel fiber-reinforced concrete beams and the addition of high-strength rebar is in favor of cracking resistance and ductile behavior of beams. For beams reinforced with normal-strength rebar, the ratio of bending strength prediction to the test result ranged from 0.81 to 1.42, whereas for beams reinforced with high-strength rebar, the ratio of bending strength prediction to the test result ranged from 0.92 to 1.07. The comparison of bending strength from numerical analysis with the test results showed a reasonable agreement.
Study for Determination of Management Thresholds of Bridge Structural Health Monitoring System based on Probabilistic Method
Kim, Haeng-Bae ; Song, Jae-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 103~110
DOI : 10.11112/jksmi.2016.20.3.103
Recently, structural health monitoring system(SHMS) has been appled cable bridges as the effective maintenance tool and the management threshold is considered to assess the status of the bridge in SHMS. The threshold is generally determined by the allowable limit based on design specification because there is no method and standard for threshold calculation. In case of the conventional thresholds, it is difficult to recognize the event, abnormal behavior and gradual damage within the threshold. Therefore, this study reviewed the problem of previous methods and proposed the advanced methodologies based on probabilistic approach for threshold calculation which can be applied to practice work. Gumbel distribution is adopted in order to calculate the threshold for caution and warning states considering the expectations for return periods of 50 and 100 years. The thresholds were individually determined for measurement data and data variation to detect the various abnormal behaviors within allowable range. Finally, it has confirmed that the thresholds by the proposed method is detectable the abnormal behavior of real-time measuring data from SHMS.
Application of Image Processing Method to Evaluate Ultimate Strain of Rebar
Kim, Seong-Do ; Jung, Chi-Young ; Woo, Tae-Ryeon ; Cheung, Jin-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 111~121
DOI : 10.11112/jksmi.2016.20.3.111
In this study, measurements were conducted by image processing to do an in-depth evaluation of strain of rebar in a uniaxial tension test. The distribution of strain and the necking region were evaluated. The image processing is used to analyze the color information of a colored image, so that the parts consistent with desired targets can be distinguished from the other parts. After this process, the image was converted to a binary one. Centroids of each target region are obtained in the binary images. After repeating such process on the images from starting point to the finishing point of the test, elongation between targets is calculated based on the centroid of each target. The tensile test were conducted on grade 60 #7(D22) and #9(D29) rebars fabricated in accordance with ASTM A615 standards. Strain results from image processing were compared to the results from a conventional strain gauge, in order to see the validity of the image processing. With the image processing, the measuring was possible in not only the initial elastic region but also the necking region of more than 0.5(50%) strain. The image processing can remove the measuring limits as long as the targets can be video recorded. It also can measure strain at various spots because the targets can easily be attached and detached. Thus it is concluded that the image processing helps overcome limits in strain measuring and will be used in various ways.
Absorption Properties of Coarse Aggregate according to Pressurization for Development of High Fluidity Concrete under High Pressure Pumping
Choi, Yun-Wang ; Choi, Byung-Keol ; Oh, Sung-Rok ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 122~129
DOI : 10.11112/jksmi.2016.20.3.122
In this study, we developed a pressing device which can reproduce the pressure of concrete inside the conveying pipe as a part of the basic study to development of high fluidity concrete under high pressure pumping. Using this pressing device, we evaluated a absorption properties of aggregate that are crushed coarse aggregate, river gravel and lightweight coarse aggregate according to pressure of coarse aggregate and aggregate inside a high fluidity concrete, focused on the reduction of unit water quantity by pressure. In addition, it was evaluated the compressive strength of high fluidity concrete about before and after of pressive. Test a result, case of condition under the high pressure of 250 bar, absorption ratio of crushed coarse aggregate and river gravel were not increased above the surface absorption, absorption ratio of lightweight coarse aggregate was increased than the surface absorption.
A Development of Real-time Vibration Monitoring and Analysis System Linked to the Integrated Management System of Ministry of Public Safety and Security
Lim, Ji-Hoon ; Jung, Jin-Woo ; Moon, Dae-Joong ; Choi, Dong-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 130~139
DOI : 10.11112/jksmi.2016.20.3.130
A frequency of earthquake occurrence in the Republic of Korea is increasing over the past few decades. In this situation, an importance of earthquake prevention comes to the fore because the earthquake does damage to structures and causes severe damage of human life. For the earthquake prevention, a real-time vibration measurement for structures is important. As an example, the United States of America and Japan have already been monitoring real-time earthquake acceleration for the important structures and the measured acceleration data has been managed by forming database. This database could be used for revising the seismic design specifications or predicting the damage caused by earthquake. In Korea, Earthquake Recovery Plans Act and Enforcement Regulations are revised and declared lately. Ministry of Public Safety and Security is constructing a integrated management system for the measured earthquake acceleration data. The purpose of this research is to develop a real-time vibration monitoring and analysis system for structures which links to the integrated management system. The developed system contains not only a monitoring function to show real-time acceleration data but also an analysis system to perform fast fourier transform, to obtain natural frequency and earthquake magnitude, to show response spectrum and power spectrum, and to evaluate structural health. Additionally, this system is designed to be able to link to the integrated management system of Ministry of Public Safety and Security. It is concluded that the developed system can be useful to build a safety management network, minimize maintenance cost of structures, and prevention of the structural damage due to earthquake.
Enhanced Durability Performance of Rock-Filled-Dam Face-Slab Concrete using Fly Ash and Blended PVA Fiber
Woo, Sang-Kyun ; Won, Jong-Pil ; Bae, Doo-San ; Chu, In-Yeop ;
Journal of the Korea institute for structural maintenance and inspection, volume 20, issue 3, 2016, Pages 140~148
DOI : 10.11112/jksmi.2016.20.3.140
This study examined the durability of face-slab concrete in Concrete-Faced Rock-filled Dams(CFRDs). The durability of face-slab concrete can be improved by optimizing the amount of fly ash in the cement mixture. Durability tests including plastic shrinkage, permeability, abrasion resistance, and repeated freezing and thawing were done on face-slab concrete specimens with different amounts of fly ash and blended PVA(Poly Vinyl Alcohol) fibre. When the effect of the fly ash content on concrete durability was evaluated, the results showed that a 15% fly ash content and 0.1% blended PVA fiber yielded the optimum durability level for concrete-faced rock-filled dams.