Composite Performance of Prestressed Hollow-Core Slabs with Cast-in-Place Topping Concrete
Park M.-K. Lee D. Yang Y. Zhang D. Kim K.S.
May 2022American Concrete Institute
ACI Structural Journal
2022#119Issue 3153 - 164 pp.
Prestressed hollow-core slabs (PHCS) are generally fabricated through an automated extrusion method by using an extremely dry concrete mixture to maximize productivity in precast factories. In consequence, it is very challenging not only to provide shear connectors along the interface between the PHCS unit and cast-in-place (CIP) topping concrete but also to secure code-compliant intentional roughness due to its extremely hard and flat surface condition. Thus, it is difficult to have sufficient horizontal shear strength required to achieve flexural performances of the prestressed composite members. To this end, extensive pushoff tests were conducted in this study considering various interface roughness conditions, from which some viable options were chosen. Then, flexural tests on full-scale composite PHCS specimens were performed with selected surface conditions from the pushoff tests. On this basis, the applicability of various surface roughness conditions that are inevitably faced in practices is examined based on ACI 318 design criteria and nonlinear analysis. It was confirmed that sufficient horizontal shear strength can be achieved not only by properly roughened surface conditions but also by placing wire meshes between PHCS units even with no intentional roughness.
composite beam , hollow-core slab , interfacial shear , precast , roughness
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The University of Seoul, Seoul, South Korea
Delft University of Technology, Delft, Netherlands
Department of Architectural Engineering, Chungbuk National University, Cheongju, South Korea
Department of Civil and Environmental Engineering (CEE), Delft University of Technology, Netherlands
Department of Civil and Environmental Engineering, The School of Engineering and Digital Sciences, Nazarbayev University, Kazakhstan
Department of Architectural Engineering, The University of Seoul, South Korea
The University of Seoul
Delft University of Technology
Department of Architectural Engineering
Department of Civil and Environmental Engineering (CEE)
Department of Civil and Environmental Engineering
Department of Architectural Engineering
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