Title: Factors affecting web-shear capacity of hollow-core slabs with filled cores
Date Published: July - August 2021
Volume: 66
Issue: 4
Page Numbers: 43 - 65
Authors: Scott A. Asperheim and Benjamin Z. Dymond
https://doi.org/10.15554/pcij66.4-02

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Abstract

Since the 1970s, hollow-core slab manufacturers have filled voids with concrete to increase shear capacity, but limited research into the efficacy of this practice has been completed. Forty tests were performed on 20 hollow-core slabs that were 12 in. (300 mm) deep to quantify the variation in web-shear capacity that can be gained. The 20 slabs had either no core fill, cores filled with concrete or grout, or one void omitted during fabrication. Two different cross sections were investigated, a heavy-duty slab with thick webs and noncircular voids and a slab with narrow webs and circular voids. The results indicated that adequate composite action between the core-fill material and extruded slab was necessary to realize web-shear capacity gains. In addition, the prestressing strand jacking stress, concrete compressive strength at transfer, transfer length, and moment demand can have a large effect on the web-shear capacity of a hollow-core slab.