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Your search keyword '"Han, Sun‐Jin"' showing total 126 results
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126 results on '"Han, Sun‐Jin"'

7. Web‐shear capacities of composite hollow‐core slabs with core‐filling and topping concretes.

Author

Han, Sun‐Jin, Joo, Hyo‐Eun, Kim, Jae Hyun, Heo, Inwook, and Kim, Kang Su

Subjects
*CONSTRUCTION slabs, *STRUCTURAL engineers, *RESIDUAL stresses, *STRUCTURAL engineering, *ELASTICITY, *CONCRETE slabs
Abstract

This paper presents an experimental shear test performed to investigate the web‐shear capacity of composite hollow‐core slabs (HCS) with cast‐in‐place (CIP) concrete. Five HCS specimens are fabricated, and the presence of a topping slab and number of cores strengthened by core‐filling concrete are set as key test variables. The shear force–displacement responses of the specimens, patterns of cracks occurring in the HCS and filled cores, strain behavior of stirrups, and composite action between the HCS and CIP concrete are measured and analyzed comprehensively. In addition, the web‐shear capacity of the composite HCS with CIP concrete is calculated based on elasticity theory and the transformed area method, in which the residual stress ratio factor is introduced to reflect the shear contribution of the core‐filling concrete after its shear cracking. Moreover, a practical equation is proposed to allow structural engineers to easily perform the shear‐strengthening design of HCS via the core‐filling method. The detailed model and the simplified equation accurately evaluate the web‐shear capacities of the HCS specimens. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Interlayer Bond Strength of 3D Printed Concrete Members with Ultra High Performance Concrete (UHPC) Mix.

Author

Lee, Yoon Jung, Lee, Sang-Hoon, Kim, Jae Hyun, Jeong, Hoseong, Han, Sun-Jin, and Kim, Kang Su

Subjects
HIGH strength concrete, BOND strengths, TENSILE tests, SHEAR strength, MOLDS (Casts & casting)
Abstract

In structures manufactured using 3D concrete printing, cracks can easily propagate along the interface between printed layers. Therefore, it was necessary to determine the interlayer bond strength. In this study, direct shear and tensile tests were performed to determine the interlayer bond stability of the 3DCP members. To confirm the appropriateness of the mix proportion used to fabricate the specimens, the open time available for printing was identified via a mixing test, and the extrudability and buildability were verified via a printing test. In addition, direct shear and tensile tests were performed using the specimen manufacturing method (i.e., mold casting and 3D printing) and printing time gap (PTG) between the laminated layers as key test variables. The interlayer bond strengths of the specimens, according to the variables obtained from the test results, were compared and analyzed based on the interfacial shear strength standards presented in the current structural codes. In the direct shear test, failure occurred at the interlayers of all the specimens, and the interlayer bond strength tended to decrease with increasing PTG. In addition, the interlayer bond strength of the direct shear specimens exceeded the interfacial shear strength suggested by current structural codes. In contrast, in the direct tensile test, interlayer surface failure occurred only in some specimens, and there was no distinct change in the interlayer bond strength owing to PTG. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Shear crack concentration in reinforced concrete beams subjected to shear and flexure.

Author

Lee, Deuckhang, Han, Sun-Jin, Joo, Hyo-Eun, Kim, Kang Su, Zhang, Dichuan, and Kim, Jong

Subjects
*CONCRETE beams, *CRACKS in reinforced concrete, *SHEAR reinforcements, *REINFORCED concrete, *SHEAR strength
Abstract

The dual potential capacity model was developed in the authors' previous studies to estimate the shear strengths of reinforced concrete members, in which the shear crack concentration factor was adopted as the key concept of the proposed approach. In this study, a shear test program was carefully prepared and conducted on five reinforced concrete beam specimens to investigate the crack development, propagation, and merging behavior of critical shear cracks. To this end, concrete cover thickness, diameter of reinforcement, presence of skin reinforcement, and shear reinforcement ratio were taken as the main test variables. From the experiments, the crack merging and concentration phenomena were clearly observed, and the crack concentration factors were estimated from the measured flexural and shear crack widths and spacings. The crack concentration factors were compared to those estimated by the dual potential capacity model, and the shear strengths of the test specimens were also compared with those estimated by the dual potential capacity model and other models in detail. [ABSTRACT FROM AUTHOR]

Published
2020
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