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The practical application of fiber-reinforced concrete (FRC) in structural components has gained growing interest due to structural advantages such as improved tensile strength, distributed load transfer, crack width control, as well as superior durability. To this end, reliable structural assessment techniques and analytical models have been developed, placing emphasis on tension-softening behavior owing to the bond and pull-out mechanisms of fibers at a local crack. However, these models could not be directly applicable to evaluate the multiple cracking mechanisms of high-performance fiber-reinforced concrete (HPFRC), which exhibits strain-hardening behavior. To overcome this challenge, this paper presents a probabilistic analytical technique. This approach has employed the simplified diverse embedment model (SDEM). Then, an HPFRC member was modeled with multiple segments considering the most probable number of cracks. It was assumed that material properties had a normal probability distribution and were randomly assigned to each segment. To have reliable results, 10,000 analyses were performed for each analysis case and validated using experimental test data. Based on the analysis results, the actual strain-hardening tensile behavior of an HPFRC member could be reasonably predicted with the number of segments chosen on the basis of the fiber length.
Seung-Won Choi; Jongkwon Choi; Seong-Cheol Lee. Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete. Materials 2019, 12, 2399 .
AMA StyleSeung-Won Choi, Jongkwon Choi, Seong-Cheol Lee. Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete. Materials. 2019; 12 (15):2399.
Chicago/Turabian StyleSeung-Won Choi; Jongkwon Choi; Seong-Cheol Lee. 2019. "Probabilistic Analysis for Strain-Hardening Behavior of High-Performance Fiber-Reinforced Concrete." Materials 12, no. 15: 2399.
A sectional analysis procedure for reinforced concrete members subjected to pure torsion is presented in this paper. On the development of the analysis procedure, the reinforced concrete section is modeled with reinforced concrete elements subjected to biaxial stress states, on the basis of the thin-walled tube analogy. Each reinforced concrete element is analyzed with the modified compression field theory (MCFT) to take into account for compression softening and tension stiffening effects in cracked reinforced concrete. Considering analysis results of reinforced concrete elements, equilibrium, and compatibility on the section are checked. For verification of the developed analysis procedure, analytical predictions were compared with test results of 16 reinforced concrete beams subjected to a pure torsional load which are available in the literature. Comparison between predicted and experimentally obtained torque-twist responses showed that the proposed procedure is capable of capturing the ultimate torsional capacity as well as the angle of twist within a reasonable range.
Jongkwon Choi; Seong-Cheol Lee. Sectional Analysis Procedure for Reinforced Concrete Members Subjected to Pure Torsion. Advances in Civil Engineering 2019, 2019, 1 -13.
AMA StyleJongkwon Choi, Seong-Cheol Lee. Sectional Analysis Procedure for Reinforced Concrete Members Subjected to Pure Torsion. Advances in Civil Engineering. 2019; 2019 ():1-13.
Chicago/Turabian StyleJongkwon Choi; Seong-Cheol Lee. 2019. "Sectional Analysis Procedure for Reinforced Concrete Members Subjected to Pure Torsion." Advances in Civil Engineering 2019, no. : 1-13.
Quick-hardening railway track was developed to rapidly convert old-style ballast track to slab track in order to improve its maintainability and ride comfort. On bridges, quick-hardening track is applied in a segmented structure to reduce the temperature constraint, and anchors at the centers of the segments securely couple the track to the bridge. In this study, an anchor system is proposed that facilitates fast construction, and two designs for the proposed anchor systems are provided along with experimental test results of the same. Two anchor system designs were developed to allow for the maximum possible longitudinal and transverse loads in high-speed railways while considering the frictional resistance between the track slab and bridge deck. The biaxial shear capacity of each design was investigated experimentally, and the structural capacity for biaxial shear loads was evaluated using an elliptical curve to represent the longitudinal and transverse shear capacities. The minimum friction coefficient was determined based on the results of the evaluation to minimize damage to the anchor. The results obtained from the experiments confirmed that the proposed anchor systems possess sufficient shear capacity for application on high-speed railway bridges.
Kyoung Chan Lee; Il-Wha Lee; Seong-Cheol Lee. Biaxial Shear Load Capacity of Anchor System for Quick-Hardening Track on Railway Bridges. Advances in Civil Engineering 2018, 2018, 1 -14.
AMA StyleKyoung Chan Lee, Il-Wha Lee, Seong-Cheol Lee. Biaxial Shear Load Capacity of Anchor System for Quick-Hardening Track on Railway Bridges. Advances in Civil Engineering. 2018; 2018 ():1-14.
Chicago/Turabian StyleKyoung Chan Lee; Il-Wha Lee; Seong-Cheol Lee. 2018. "Biaxial Shear Load Capacity of Anchor System for Quick-Hardening Track on Railway Bridges." Advances in Civil Engineering 2018, no. : 1-14.
Samson Ayodeji Olubiyi; Seong-Cheol Lee; Chang-Joo Hah. Effect of mineral admixtures in concrete on biological shield wall radiation in APR1400. Progress in Nuclear Energy 2018, 107, 110 -115.
AMA StyleSamson Ayodeji Olubiyi, Seong-Cheol Lee, Chang-Joo Hah. Effect of mineral admixtures in concrete on biological shield wall radiation in APR1400. Progress in Nuclear Energy. 2018; 107 ():110-115.
Chicago/Turabian StyleSamson Ayodeji Olubiyi; Seong-Cheol Lee; Chang-Joo Hah. 2018. "Effect of mineral admixtures in concrete on biological shield wall radiation in APR1400." Progress in Nuclear Energy 107, no. : 110-115.
In this paper, an analytical model to rationally evaluate the shear strength of reinforced concrete beams with stirrups has been developed. In the developed model, a shear critical section has been idealized with a single web element for shear and the top and bottom chords for flexure, respectively. With the longitudinal strain at the mid-depth in the shear critical section, evaluated from the flexural analysis, the web element has been analyzed, based on the analysis procedure modified from the modified compression field theory finite element formulation. Through the comparison with the test results of 201 reinforced concrete beams with stirrups exhibiting shear failure before flexural yielding, it was investigated that the developed model well predicted the actual shear strength of reinforced concrete beams with stirrups. In addition, it was investigated that the developed model rationally considered the effect of main parameters such as concrete compressive strength, shear span–depth ratio, stirrup ratio, and member depth. Through simplification, the developed model can be useful to develop more rational shear design provisions for reinforced concrete members with stirrups.
Esa Obande Jude; Chang-Hoo Oh; Seong-Cheol Lee. Single Web Shear Element Model for Shear Strength of RC Beams with Stirrups. International Journal of Concrete Structures and Materials 2018, 12, 27 .
AMA StyleEsa Obande Jude, Chang-Hoo Oh, Seong-Cheol Lee. Single Web Shear Element Model for Shear Strength of RC Beams with Stirrups. International Journal of Concrete Structures and Materials. 2018; 12 (1):27.
Chicago/Turabian StyleEsa Obande Jude; Chang-Hoo Oh; Seong-Cheol Lee. 2018. "Single Web Shear Element Model for Shear Strength of RC Beams with Stirrups." International Journal of Concrete Structures and Materials 12, no. 1: 27.
The potential for monitoring the construction of post-tensioned concrete beams and detecting damage to the beams under loading conditions was investigated through an experimental program. First, embedded sensors were investigated that could measure pre-stress from the fabrication process to a failure condition. Four types of sensors were installed on a steel frame, and the applicability and the accuracy of these sensors were tested while pre-stress was applied to a tendon in the steel frame. As a result, a tri-sensor loading plate and a Fiber Bragg Grating (FBG) sensor were selected as possible candidates. With those sensors, two pre-stressed concrete flexural beams were fabricated and tested. The pre-stress of the tendons was monitored during the construction and loading processes. Through the test, it was proven that the variation in thepre-stress had been successfully monitored throughout the construction process. The losses of pre-stress that occurred during a jacking and storage process, even those which occurred inside the concrete, were measured successfully. The results of the loading test showed that tendon stress and strain within the pure span significantly increased, while the stress in areas near the anchors was almost constant. These results prove that FBG sensors installed in a middle section can be used to monitor the strain within, and the damage to pre-stressed concrete beams.
Kyung-Joon Shin; Seong-Cheol Lee; Yun Yong Kim; Jae-Min Kim; Seunghee Park; Hwanwoo Lee. Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors. Sensors 2017, 17, 1843 .
AMA StyleKyung-Joon Shin, Seong-Cheol Lee, Yun Yong Kim, Jae-Min Kim, Seunghee Park, Hwanwoo Lee. Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors. Sensors. 2017; 17 (8):1843.
Chicago/Turabian StyleKyung-Joon Shin; Seong-Cheol Lee; Yun Yong Kim; Jae-Min Kim; Seunghee Park; Hwanwoo Lee. 2017. "Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors." Sensors 17, no. 8: 1843.
Recently, ultra high performance fiber reinforced concrete (UHPFRC) has been developed to attain considerably increased compressive cracking strength and ductile tensile behavior with high tensile strength through adding straight steel fibers in concrete mixture. Although benefits with UHPFRC were investigated through experimental program, it is difficult to predict structural behavior of UHPFRC members since theoretical approaches are limited. In this paper, inverse analysis procedure has been proposed for a three-point bending test with notched UHPFRC beams so that tensile behavior of UHPFRC could be rationally evaluated. On the inverse analysis procedure, failure mode of the UHPFRC beam was simplified and the simplified diverse embedment model (SDEM) was employed. To verify the proposed inverse analysis procedure, UHPFRC beams with a notch were analyzed with the tensile behavior of UHPFRC evaluated through the inverse analysis procedure. The analytical predictions showed good agreement with the load-crack mouth opening displacement (CMOD) responses measured through the three-point bending test. Consequently, it can be concluded that UHPFRC tensile behavior can be rationally evaluated through the proposed inverse analysis procedure. The proposed inverse analysis procedure can be useful in relevant research areas such as development of advanced design approaches or computational methods for UHPFRC members.
Seong-Cheol Lee; Han-Byeol Kim; Changbin Joh. Inverse Analysis of UHPFRC Beams with a Notch to Evaluate Tensile Behavior. Advances in Materials Science and Engineering 2017, 2017, 1 -10.
AMA StyleSeong-Cheol Lee, Han-Byeol Kim, Changbin Joh. Inverse Analysis of UHPFRC Beams with a Notch to Evaluate Tensile Behavior. Advances in Materials Science and Engineering. 2017; 2017 ():1-10.
Chicago/Turabian StyleSeong-Cheol Lee; Han-Byeol Kim; Changbin Joh. 2017. "Inverse Analysis of UHPFRC Beams with a Notch to Evaluate Tensile Behavior." Advances in Materials Science and Engineering 2017, no. : 1-10.
Yun-Bum Choi; Seong-Cheol Lee. Nonlinear Finite Element Analysis for RC Shear Wall with an Opening Considering Rebar Development Length. Journal of the Computational Structural Engineering Institute of Korea 2016, 29, 547 -554.
AMA StyleYun-Bum Choi, Seong-Cheol Lee. Nonlinear Finite Element Analysis for RC Shear Wall with an Opening Considering Rebar Development Length. Journal of the Computational Structural Engineering Institute of Korea. 2016; 29 (6):547-554.
Chicago/Turabian StyleYun-Bum Choi; Seong-Cheol Lee. 2016. "Nonlinear Finite Element Analysis for RC Shear Wall with an Opening Considering Rebar Development Length." Journal of the Computational Structural Engineering Institute of Korea 29, no. 6: 547-554.
Yujeong Choi; Chang-Lak Kim; Seong-Cheol Lee. Evaluation on Radioactive Waste Disposal Amount of Kori Unit 1 Reactor Vessel Considering Cutting and Packaging Methods. Journal of the Nuclear Fuel Cycle and Waste Technology(JNFCWT) 2016, 14, 123 -134.
AMA StyleYujeong Choi, Chang-Lak Kim, Seong-Cheol Lee. Evaluation on Radioactive Waste Disposal Amount of Kori Unit 1 Reactor Vessel Considering Cutting and Packaging Methods. Journal of the Nuclear Fuel Cycle and Waste Technology(JNFCWT). 2016; 14 (2):123-134.
Chicago/Turabian StyleYujeong Choi; Chang-Lak Kim; Seong-Cheol Lee. 2016. "Evaluation on Radioactive Waste Disposal Amount of Kori Unit 1 Reactor Vessel Considering Cutting and Packaging Methods." Journal of the Nuclear Fuel Cycle and Waste Technology(JNFCWT) 14, no. 2: 123-134.
Seong-Cheol Lee; Joung-Hwan Oh; Jae-Yeol Cho. Fiber efficiency in SFRC members subjected to uniaxial tension. Construction and Building Materials 2016, 113, 479 -487.
AMA StyleSeong-Cheol Lee, Joung-Hwan Oh, Jae-Yeol Cho. Fiber efficiency in SFRC members subjected to uniaxial tension. Construction and Building Materials. 2016; 113 ():479-487.
Chicago/Turabian StyleSeong-Cheol Lee; Joung-Hwan Oh; Jae-Yeol Cho. 2016. "Fiber efficiency in SFRC members subjected to uniaxial tension." Construction and Building Materials 113, no. : 479-487.
Seong Cheol Lee; Jeong Hwan Oh; Jae Yeol Cho. Fiber Orientation Factor on Rectangular Cross-Section in Concrete Members. International Journal of Engineering and Technology 2015, 7, 470 -473.
AMA StyleSeong Cheol Lee, Jeong Hwan Oh, Jae Yeol Cho. Fiber Orientation Factor on Rectangular Cross-Section in Concrete Members. International Journal of Engineering and Technology. 2015; 7 (6):470-473.
Chicago/Turabian StyleSeong Cheol Lee; Jeong Hwan Oh; Jae Yeol Cho. 2015. "Fiber Orientation Factor on Rectangular Cross-Section in Concrete Members." International Journal of Engineering and Technology 7, no. 6: 470-473.
Recently, the CEB-FIP Model Code 2010 (MC10) provided a fibre-reinforced concrete tension model by which to evaluate the tensile behaviour of fibre-reinforced concrete, so that the tensile contribution achieved by fibres can be acknowledged in the design of concrete structures. In this model, the tensile behaviour of fibre-reinforced concrete is evaluated using a bending test of fibre-reinforced concrete beams with a notch, but there are still some deficiencies. For example, the effect of fibre type on the tensile behaviour is not considered. In this paper, therefore, the fibre-reinforced concrete tension model in MC10 has been re-evaluated, focused on the effect of fibre type. From the tensile behaviour of fibre-reinforced concrete predicted by the simplified diverse embedment model, fibre-reinforced concrete beams were analysed to derive the tensile behaviour of fibre-reinforced concrete by following the procedure presented in MC10. From comparison of the predictions with test results, it was determined that MC10 underestimates the tensile stress due to end-hooked fibres; while it overestimated the tensile stress due to straight fibres, when crack width was relatively small. Therefore, it can be concluded that the fibre-reinforced concrete tension model in MC10 can be improved by considering the effect of fibre type.
S.-C. Lee. Re-evaluation of fibre-reinforced concrete tension model in CEB-FIP Model Code 2010. Materials Research Innovations 2015, 19, S8 -107.
AMA StyleS.-C. Lee. Re-evaluation of fibre-reinforced concrete tension model in CEB-FIP Model Code 2010. Materials Research Innovations. 2015; 19 (sup8):S8-107.
Chicago/Turabian StyleS.-C. Lee. 2015. "Re-evaluation of fibre-reinforced concrete tension model in CEB-FIP Model Code 2010." Materials Research Innovations 19, no. sup8: S8-107.
Recently, there have been many studies using high-performance fibre-reinforced cementitious composites to make up for the weaknesses of construction materials based on cement. However, information about the shear behaviour of high-performance fibre-reinforced cementitious composites beams is very limited, because most studies were focused on their flexural behaviour. In this study, therefore, an extensive experimental programme was conducted to investigate the shear strength of high-performance fibre-reinforced cementitious composites beams with conventional longitudinal reinforcement. A total of 48 specimens were tested, varying in fibre content, longitudinal-reinforcement ratio and shear-span-to-depth ratio. From the test results, it was determined that the shear strength of the experimental beams increased with increasing tensile strength of high-performance fibre-reinforced cementitious composites, whereas it was not significantly affected by the tensile ductility of high-performance fibre-reinforced cementitious composites. As the longitudinal-reinforcement ratio increased to 3%, or the shear-span-to-depth ratio decreased, the shear strength of the high-performance fibre-reinforced cementitious composites beams increased. The results of this study will be useful for deriving a model describing the shear strength of high-performance fibre-reinforced cementitious composites beams with longitudinal reinforcement.
S.-C. Lee; T.-H. Song; K.-J. Shin. Shear strength of high-performance fibre-reinforced cementitious composites beams with longitudinal reinforcement. Materials Research Innovations 2015, 19, S8 -277.
AMA StyleS.-C. Lee, T.-H. Song, K.-J. Shin. Shear strength of high-performance fibre-reinforced cementitious composites beams with longitudinal reinforcement. Materials Research Innovations. 2015; 19 (sup8):S8-277.
Chicago/Turabian StyleS.-C. Lee; T.-H. Song; K.-J. Shin. 2015. "Shear strength of high-performance fibre-reinforced cementitious composites beams with longitudinal reinforcement." Materials Research Innovations 19, no. sup8: S8-277.
In this paper, the flexural behavior of High-performance Fiber-Reinforced Cementitious Composite (HPFRCC) has been investigated, especially focusing on the localization of cracks, which significantly governs the flexural behavior of HPFRCC members. From four points bending tests with HPFRCC members, it was observed that almost evenly distributed cracks formed gradually, followed by a localized crack that determined the failure of the members. In order to investigate the effect of a localized crack on the flexural behavior of HPFRCC members, an analytical procedure has been developed with the consideration of intrinsic inhomogeneous material properties of HPFRCC such as cracking and ultimate tensile strengths. From the comparison, while the predictions with homogeneous material properties overestimated flexural strength and ductility of HPFRCC members, it was found that the analysis results considering localization effect with inhomogeneous material properties showed good agreement with the test results, not only the flexural strength and ductility but also the crack widths. The test results and the developed analysis procedure presented in this paper can be usefully applied for the prediction of flexural behaviors of HPFRCC members by considering the effect of localized cracking behavior.
Kyung-Joon Shin; Kyu-Hyeon Jang; Young-Cheol Choi; Seong-Cheol Lee. Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties. Materials 2015, 8, 1934 -1950.
AMA StyleKyung-Joon Shin, Kyu-Hyeon Jang, Young-Cheol Choi, Seong-Cheol Lee. Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties. Materials. 2015; 8 (4):1934-1950.
Chicago/Turabian StyleKyung-Joon Shin; Kyu-Hyeon Jang; Young-Cheol Choi; Seong-Cheol Lee. 2015. "Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties." Materials 8, no. 4: 1934-1950.
In this paper, the compressive behavior of fiber-reinforced concrete with end-hooked steel fibers has been investigated through a uniaxial compression test in which the variables were concrete compressive strength, fiber volumetric ratio, and fiber aspect ratio (length to diameter). In order to minimize the effect of specimen size on fiber distribution, 48 cylinder specimens 150 mm in diameter and 300 mm in height were prepared and then subjected to uniaxial compression. From the test results, it was shown that steel fiber-reinforced concrete (SFRC) specimens exhibited ductile behavior after reaching their compressive strength. It was also shown that the strain at the compressive strength generally increased along with an increase in the fiber volumetric ratio and fiber aspect ratio, while the elastic modulus decreased. With consideration for the effect of steel fibers, a model for the stress–strain relationship of SFRC under compression is proposed here. Simple formulae to predict the strain at the compressive strength and the elastic modulus of SFRC were developed as well. The proposed model and formulae will be useful for realistic predictions of the structural behavior of SFRC members or structures.
Seong-Cheol Lee; Joung-Hwan Oh; Jae-Yeol Cho. Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers. Materials 2015, 8, 1442 -1458.
AMA StyleSeong-Cheol Lee, Joung-Hwan Oh, Jae-Yeol Cho. Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers. Materials. 2015; 8 (4):1442-1458.
Chicago/Turabian StyleSeong-Cheol Lee; Joung-Hwan Oh; Jae-Yeol Cho. 2015. "Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers." Materials 8, no. 4: 1442-1458.