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129 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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27. Degradation of flexural strength in reinforced concrete members caused by steel corrosion

Author

Han, Sun-Jin, Lee, Deuck Hang, Kim, Kang Su, Seo, Soo-Yeon, Moon, Juhyuk, and Monteiro, Paulo J.M.

Subjects
Steel -- Corrosion, Reinforced concrete -- Properties -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT The volume expansion of reinforcements due to corrosion produces tensile stresses on the surrounding concrete, leading to radial cracks in the concrete cover and to significant reduction in the [...]

Published
2014
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