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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 18, Issue 6 - Nov 2014
Volume 18, Issue 5 - Sep 2014
Volume 18, Issue 4 - Jul 2014
Volume 18, Issue 3 - May 2014
Volume 18, Issue 2 - Mar 2014
Volume 18, Issue 1 - Jan 2014
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Equivalent Plastic Hinge Length Model for Flexure-Governed RC Shear Walls
Mun, Ju-Hyun ; Yang, Keun-Hyeok ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 1~8
DOI : 10.11112/jksmi.2014.18.2.001
The present study proposes a simple equation to straightforwardly determine the potential plastic hinge length in boundary element of reinforced concrete shear walls. From the idealized curvature distribution along the shear wall length, a basic formula was derived as a function of yielding moment, maximum moment, and additional moment owing to diagonal tensile crack. Yielding moment and maximum moment capacities of shear wall were calculated on the basis of compatability of strain and equilibrium equation of internal forces. The development of a diagonal tensile crack at web was examined from the shear transfer capacity of concrete specified in ACI 318-11 provision and then the additional moment was calculated using the truss mechanism along the crack proposed by Park and Paulay. The moment capacities were simplified from an extensive parametric study; as a result, the equivalent plastic hinge length of shear walls could be formulated using indices of longitudinal tensile reinforcement at the boundary element, vertical reinforcement at web, and applied axial load. The proposed equation predicted accurately the measured plastic hinge length, providing that the mean and standard deviation of ratios between predictions and experiments are 1.019 and 0.102, respectively.
Collapse Capacity Evaluation of Steel Intermediate Moment Frames Using Incremental Dynamic Analysis
Shin, Dong-Hyeon ; Kim, Hyung-Joon ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 9~20
DOI : 10.11112/jksmi.2014.18.2.009
Steel intermediate moment frames (IMFs) have been generally used as seismic load resisting systems (SLRSs) of a building to provide resistances against strong ground shaking. However, most of low and mid-rise steel buildings in Korea were constructed during pre-seismic code era or before the introduction of well-organized current seismic codes. It has been recognized that the seismic performance of these steel IMFs is still questionable. In order to respond to such a question, this study quantitatively investigates the seismic capacities of steel IMFs. Prototype models are built according to the number of stories, the levels of elastic seismic design base shear and the ductilities of structural components. Also, the other prototype models employing hysteretic energy dissipating devices (HEDDs) are considered. The collapse mechanism and the seismic performance of the prototype models are then described based on the results obtained from nonlinear-static and incremental-dynamic analyses. The seismic performance of the prototype models is assessed from collapse margin ratio (CMR) and collapse probability. From the assessment, the prototype model representing new steel IMFs has enough seismic capacities while, the prototype models representing existing steel IMFs provide higher collapse probabilities. From the analytic results of the prototype models retrofitted with HEDDs, the HEDDs enhance the seismic performance and collapse capacity of the existing steel IMFs. This is due to the energy dissipating capacity of the HEDDs and the redistribution of plastic hinges.
Experimental Study for GFRP Reinforced Concrete Beams without Stirrups
Ko, Seong-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 21~29
DOI : 10.11112/jksmi.2014.18.2.021
This paper evaluates the shear strength, behavior and failure mode of reinforced concrete beams with deformed GFRP reinforcing bar. Four concrete beam specimens were constructed and tested. It was carried out to observe failure behavior and load-deflection of simply supported concrete beams subjected to four-point monotonic loading. In order to eliminate of the uncertainty by the shear reinforcements, any stirrups were not used. Variables of the specimens were shear span-depth ratio, effective reinforcement ratio. The dimensions of specimen is 3,300 or
. Clear span and shear span were 2,900mm, 1,000mm respectively. Shear span-depth ratios were 6.5 and 2.5. Effective ratios of Longitudinal GFRP reinforcing bar were
. All beam specimens were broken by diagonal-tension shear and the ACI 440.1R, CSA S806 and ISIS, which was used to design test beams, showed considerable deviation between prediction and test results of shear strengths.
An Analysis Method of Large Structure Using Matrix Blocking
Jung, Sung-Jin ; Lee, Min-Sup ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 30~37
DOI : 10.11112/jksmi.2014.18.2.030
In this study, we studied how to perform the structural analysis which need a large-capacity flash memory with the computer program when the flash memory storage of a personal computer has no enough room for the analysis of structure. As one of the solutions of this problem, the blocking method of stiffness matrix, which is a method that stiffness matrix is divided by a few blocks and each block is sequentially used for the calculation of matrix decomposition, is proposed and an algorithm available in computer program is derived on the method. Finally, A structural analysis program (sNs) based on this study is developed and the correctness and efficiency of the algorithm is founded through some examples which are fundamental in structural analysis.
A FEA Study on the Bond Property according to the Rib-Shape of Reinforcement
Mihn, Joon-Soo ; Hong, Geon-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 38~46
DOI : 10.11112/jksmi.2014.18.2.038
Effects of various parameters on bond property between reinforcing bar and concrete are investigated in many researchers, and various study is on going to improve the bond strength. Properties of interface between reinforcement and concrete is important role in bond property. This study analyzed the interfacial bond mechanism between deformed bar and concrete by finite element analysis (FEA) to evaluate the effect of rib shape. The FEA model in this study is simplified 2D plane stress model. The variables of analysis are selected by rib angle, rib height, rib spacing and relative rib area. From the results of analysis, reinforcing bars with rib angle
showed better bond strength than the others. Bond strength ratio following to the rib height is proportionally increased up to the
, but rib spacing has little effect on bond strength. The results also indicated that relative rib area can be efficiently represented the properties of deformed shape in reinforcing bars, and zigzagged rib height shape showed excellent bond strength increase.
Reliability Analysis Model for Deflection Limit State of Deteriorated Steel Girder Bridges
Eom, Jun-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 47~53
DOI : 10.11112/jksmi.2014.18.2.047
The paper investigates the limit state of deflection for short and medium span steel girder bridges. Deflection depends on stiffness of steel girders and integrity of the reinforced concrete slab (composite action). Load and resistance parameters are treated as random variables. A probabilistic model is developed for prediction of the deflection. The structural performance can be affected by deterioration of components, in particular corrosion of steel girders. In addition, the creep of concrete can greatly influence the deflection of composite structures. Therefore, the statistical models for creep and corrosion of structural steel are incorporated in the model. Structures designed according to the AASHTO LRFD Code are considered. Load and resistance models are developed to account for time-variability of the parameters. Monte Carlo simulations are used to estimate the deflections and probabilities of serviceability failure. Different span lengths and girder spacing are considered for structures designed as moment-controlled and deflection-controlled. A summary of obtained results is presented.
An Experimental Study on the Bolted Connection Fatigue Capacity of Corrugated Steel Plates
Oh, Hong-Seob ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 54~63
DOI : 10.11112/jksmi.2014.18.2.054
Corrugated steel plate structure, which is built by assembling corrugated steel plate segments with bolts on site and filling the surroundings with quality soil, is widely used for buried structures as a eco-corridors, small bridges, and closed conduits. This experimental study is dealt with the static and fatigue performance of bolt connected corrugated steel plates under flexural loading. The experimental variables to verify the fatigue performance are bolt diameters and detailing of connection such as washer and the corrugation dimension of specimens has a
mm. The experimental ultimate strength of specimens under static loading was higher than the theoretical strength and all specimen failed by a bearing and tearing failure of bolt hole of upper plate. Therefore, a fatigue tests of specimens had 6.0mm and 7.0mm thickness was conducted in which the load range was up to 209kN and 516kN, respectively. From the fatigue test, failure patterns are changed from plate bearing and tearing which is a typical failure pattern of static failure to a bearing failure of plate and shear failure of bolt, and experimental fatigue limit at
cycles is about 85MPa.
A Strain based Load Identification for the Safety Monitoring of the Steel Structure
Oh, Byung-Kwan ; Lee, Ji-Hoon ; Choi, Se-Woon ; Kim, You-Sok ; Park, Hyo-Seon ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 64~73
DOI : 10.11112/jksmi.2014.18.2.064
This study proposes a load identification for the safety monitoring of the steel structure based on measured strain data. Instead of parameterizing the stiffness of structure in the existing system identification researches, the loads on a structure and a matrix (the unit strain matrix) defined by the relationship between strain and load on structure are parameterized in this study. The error function is defined by the difference between measured strain and strain estimated by parameters. In order to minimize this error function, the genetic algorithm which is one of the optimization algorithm is applied and the parameters are found. The loads on the structure can be identified through the founded parameters and measured strain data. When the loads are changed, the unmeasured strains are estimated based on founded parameters and measured strains on changed state of structure. To verify the load identification algorithm in this paper, the static experimental test for 3 dimensional steel frame structure was implemented and the loads were exactly identified through the measured strain data. In case of loading changes, the unmeasured strains which are monitoring targets on the structure were estimated in acceptable error range (0.17~3.13%). It is expected that the identification method in this study is applied to the safety monitoring of steel structures more practically.
Analytical Study for Performance Improvement of Studs for Steel Plate Concrete(SC) Walls subjected to Bending Moment
Cho, Sung-Gook ; Lim, Jin-Sun ; Jeong, Young-Do ; Yi, Seong-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 74~81
DOI : 10.11112/jksmi.2014.18.2.074
In this study, it was conducted to improve the performance of stud of Steel Plate Concrete(SC) walls subjected to bending moment. Non-linearity of contact interface, connection, and material properties were considered in finite element modeling of SC wall. In order to validate the analytical model, furthermore, a foregoing laboratory experiment was simulated by FEM, so that comparison between the measured result and the analysis result have be done. The size of the analytical model was determined by reflecting various references and the analyses were performed according to various shapes and arrangements of stud. Additionally, the validity of the model considering the related provisions in the KEPIC SNG standard was also considered. As a result, the optimal shape and spacing of studs was proposed through this numerical analysis and standard verification.
Evaluation of Shear Behavior of Precast RC Beams According to Replacement Ratio of Ground Granulated Blast Furnace Slag
Jeong, Chan-Yu ; Kim, Young-Seek ; Lee, Jin-Seop ; Kim, Sang-Woo ; Kim, Kil-Hee ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 82~89
DOI : 10.11112/jksmi.2014.18.2.082
This study evaluates the shear performance of precast beams with ground granulated blast furnace slag. A total of four specimens according to replacement ratio of ground granulated blast furnace slag. The specimens under three loading points had a shear span-to-depth ratio of 2.5, and a rectangular section with a width of 200mm and a effect depth of 300 mm. In this study, existing equations were used for predicting the shear strength of the specimens. The shear strength by existing equations was compared with those of 89 reinforced concrete beams without shear reinforcement. It can be shown from experimental results that all specimens with ground granulated blast furnace slag showed a similar shear strength as compared with the specimen with portland cements alone.
Shear Strength of One-way Hollow Slab According to Effective Cross Section and Reinforcement Ratio
Seok, Keun-Young ; Ye, Sang-Min ; Kang, Joo-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 90~98
DOI : 10.11112/jksmi.2014.18.2.090
The shear behavior of reinforced concrete structure is one of difficult problems that are not clearly identified theoretically despite the efforts of researchers for several years. Since bending and shear strength of hollow slab may decrease due to hollow part inside slab, prediction of such structure performance is very important. Presently the formulas of shear designing standard expressions of each country are formulas by experiment for hollow slab. In this study, the shear behavior of one-way hollow slab by reinforcement ratio were analyzed through experiment to conduct studying on estimation of shear strength, and then shear strength formulas of hollow slab were compared and analyzed.
Effect of Steam Curing on the Properties of Recycled Aggregate Concrete
Lee, Seung-Tae ; Choi, Jin-Yeop ; Park, Ki-Tae ; Seo, Dong-Woo ; You, Young-Jun ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 99~107
DOI : 10.11112/jksmi.2014.18.2.099
In this study, the effects of curing procedures on the mechanical properties of recycled aggregate concrete (RAC) were investigated. The replacement ratios by recycled coarse aggregate were 0, 25, 50, 75 and 100% by mass of natural coarse aggregate. Steam curing was adopted to all recycled aggregate concrete mixtures. Compressive and split tensile strength, water porosity, chloride ions penetration resistance and drying shrinkage measurements were carried out to determine performance of the RACs. From the test results, it was found that the mechanical performance of RAC decreased as the recycled aggregate contents increased. Furthermore, steam curing reduced the compressive and split tensile strength, water porosity and total charge of RAC, especially at the early ages. However, at the later ages, the beneficial effect of steam curing was less prominent. This study clearly showed that initial steam curing could be one of practical methods to improve performance of RAC with higher replacement ratio of recycled aggregate.
Fatigue Evaluation of a Steel Bridge in Service through Stress History Measurement and Consideration of Stress Category
Na, Sung-Ok ; Kwon, Min-Ho ; Cha, Cheol-Jun ; Kim, In-Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 108~116
DOI : 10.11112/jksmi.2014.18.2.108
The proper stress history measurement should be conducted in order to examine the accurate cause of fatigue cracks or the fatigue safety in the steel bridge. Only one strain gauge is generally installed in the field for the stress history examination because of the field circumstances, economic feasibility, workability, and so on. However, this method may not consider the actual size of the specific structure, the gauge length, and the affect of stress concentration in the welded joint. In addition, it is difficult to apply for the stress analysis. Therefore, this study suggests improvements that are a great number of gauge installations, the gauge location adjustment, and the use of the minimum length gauge. It is drived the correlative equation of strain for the distance between the welding toe and the strain gauge installation, and compare correlative equation with equation of IIW. Also, this study could estimate the remaining life and fatigue damage of bridge in service by selecting the suitable stress category. In conclusion, it is possible to understand the member which is high in the fatigue cracks, and the quantitative relations between the welding toe and the strain gauge installation distances. The proposed approach in this study can make an more accurate fatigue damage and a remaining life prediction so that the improved method should be applied in measuring the strain of bridges from now on.
The Fundamental Study of Strength and Drying Shrinkage on Alkali-activated Slag Cement Mortar with Different Entering Point of Fine Aggregate
Kim, Tae-Wan ; Eom, Jang-Sub ; Seo, Ki-Young ; Park, Hyun-Jae ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 117~125
DOI : 10.11112/jksmi.2014.18.2.117
This paper examines the fundamental properties of alkali-activated slag cement (AASC) activated by sodium hydroxide (NaOH). The water to binder (W/B) ratio was 0.4 and 0.5. And concentration of activator were 2M and 4M. Five mix design of each W/B ratios was considered. The N0 mixture was KS L 5109 method and N1~N4 were varied in different mixing time, mix step and entering points of fine aggregate. Test results clearly showed that the flow value, strength and drying shrinkage development of AASC were significantly dependent on the entering point of fine aggregate. The flow value tended to decreases with delaying entering point of fine aggregate. The compressive strength and flexural strength increases with delaying entering point. Moreover, the XRD analysis confirmed that there were sustain these results. The drying shrinkage increases with delaying entering point of fine aggregate. Futhermore, a modified mixing method incorporating all hereby experimentally derived parameters, is proposed to improvement the physical properties of AASC.
Development of Measuring Method for Bridge Scour and Water Level Using Temperature Difference Between Medium Interfaces
Joo, Bong-Chul ; Park, Ki-Tae ; You, Young-Jun ; Hwang, Yoon-Koog ;
Journal of the Korea institute for structural maintenance and inspection, volume 18, issue 2, 2014, Pages 126~133
DOI : 10.11112/jksmi.2014.18.2.126
The main source of bridge destruction is due to scour. The bridge scour is the result of erosive action of flowing water taking away ground materials from near the abutment or pier. Furthermore, the water level must be also monitored whiling flooding, because it dangers not only the stability of bridge itself, but the safety of bridge users. This study is intended to develop a new measuring system for bridge scour by overcoming the current limitation of scour measurement technique. This measuring system is confirmed its excellence and validity through this study. The newly developed measuring system finds the distance between the water surface and the ground surface by detecting temperature difference along the abutment vertically. The measuring mechanism for monitoring the bridge scour and water level is based on identifying the temperature difference among mediums, including air, water and ground. In order to validate the new measuring system, the lab experiments and the field tests are conducted and compared. It has been confirmed that this system can effectively measure the bridge scour and the water level by analyzing the temperature distribution between mediums and the temperature variation over time.