Title: Shear strengthening of prestressed
concrete hollow-core slabs
using externally bonded
carbon-fiber-reinforced polymer sheets
Date Published: September - October 2019
Volume: 64
Issue: 5
Page Numbers: 77 - 94
Authors: Xianzhe Meng, Shaohong Cheng, and Amr El Ragaby
https://doi.org/10.15554/pcij64.5-05
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Abstract
Precast, prestressed concrete hollow-core slabs are widely used for floor decks in office and residential buildings
and in parking structures. Although they are generally
designed to resist bending moments under uniformly
distributed loads, in some cases, shear failure can occur
at the region close to support due to a large concentrated
or line load. The manufacturing process for this type
of member does not allow shear reinforcement to be
arranged in the slab webs during fabrication. Therefore, the web shear resistance is only provided by the
concrete itself, which governs the member capacity. The
objective of this study was to explore the feasibility and
effectiveness of a novel shear-strengthening technique
using externally bonded carbon-fiber-reinforced polymer
(CFRP) composite sheets along the internal perimeter
of slab voids. Both experimental tests and numerical
simulations were conducted to investigate the behavior of ten full-sized prestressed concrete hollow-core
slabs: eight specimens strengthened with CFRP and two
control specimens. The studied parameters included the
length, width, and thickness of the applied CFRP sheets
and the prestressing level of the prestressed concrete
hollow-core slabs. The results show that the proposed
shear-strengthening technique not only considerably
enhances the shear capacity of prestressed concrete hollow-core slabs but also sizably improves the ductility.