Title:
Practical Approach to Predict Web-Shear Strength of Deep Prestressed Hollow-Core Slabs
Author(s):
Ernesto Hernández, Alessandro Palermo, and Ali Amin
Publication:
Structural Journal
Volume:
121
Issue:
2
Appears on pages(s):
127-141
Keywords:
biaxial tensile strength; deep members; prestressed hollow core slabs; shear stress distribution; web-shear strength
DOI:
10.14359/51740249
Date:
3/1/2024
Abstract:
This study proposes a practical design approach to estimate the
web-shear strength of deep prestressed hollow-core slabs (PHCS).
It explores the effects of critical factors such as the shear stress
distribution, biaxial tensile strength, and the reduction in effective
compressive stress in concrete, quantifying their impact on
web-shear strength. A data set of 85 entries is used to undertake
a comparative assessment, demonstrating the improved safety
and accuracy of the proposed methodology against current design
provisions and previous proposals. Moreover, it is shown that
neglecting the beneficial effect of the prestressing force in the
transfer region leads to a conservative estimation of the web-shear
strength. Furthermore, the study introduces three modified design
expressions based on ACI 318-19, fib Model Code 2010, and
CSA A23.3-14 standards. The proposed methodology has practical
implications for enhancing the safe and cost-effective use of deep
PHCS in construction practice.
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