Web-Shear Capacity of Thick Precast Prestressed Hollow-Core Slab Units Produced by Extrusion Method

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Title: Web-Shear Capacity of Thick Precast Prestressed Hollow-Core Slab Units Produced by Extrusion Method

Author(s): Min‑Kook Park, Deuck Hang Lee, Sun‑Jin Han and Kang Su Kim1

Publication: IJCSM

Volume: 13

Issue:

Appears on pages(s):

Keywords: hollow‑core, shear, web, precast concrete, prestress, capacity

Date: 1/31/2019

Abstract:
The prestressed hollow‑core slab (PHCS) is a precast concrete member that can maximize productivity and structural performance efficiency of concrete cross‑section. For the PHCS members produced by extrusion method, however, it is difficult to provide the shear reinforcement due to its unique production method to form the hollow‑cores in con‑ crete section. The recently revised ACI318 Building Code Requirements stipulate that web‑shear capacity of thick hol‑ low‑core member over 315 mm depth without the minimum shear reinforcement should be reduced in half, which may result in an excessively conservative shear design for the PHCS member compared to conventional prestressed concrete members with thin webs. In this study, shear tests on PHCS members, which have typical thicknesses widely used in precast construction industry, were conducted, and a large number of shear test data were additionally col‑ lected from previous studies to evaluate the current shear design criteria for PHCS in detail.


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