Title:
Effect of Cast-in-Place Concrete and Stirrups on Shear Capacity of Precast Composite Hollow-Core Slabs
Author(s):
Sang Yoon Kim, Deuckhang Lee, Jong-Hwan Oh, and Sun-Jin Han
Publication:
Structural Journal
Volume:
121
Issue:
6
Appears on pages(s):
75-90
Keywords:
core-filling concrete; hollow-core slab (HCS); individual mold method; precast concrete; shear; topping concrete
DOI:
10.14359/51742141
Date:
11/1/2024
Abstract:
In this study, full-scale loading tests were conducted to investigate
web-shear strengths of hollow-core slab (HCS) members strengthened in shear by using practically viable methods. All the HCS units used in the current test program were fabricated by using the individual mold method, not by the extrusion method, and the key experimental variables of the shear test were set as the presence of shear reinforcement, core-filling concrete, topping concrete, and
also the magnitude of effective prestress. The shear force-displacement behaviors, crack patterns, and strain response of shear reinforcements were reported in detail. In addition, to identify the shear strength enhancement provided under various strengthening conditions in a quantitative manner, existing shear test results of series specimens, including a naked HCS member and corresponding composite HCS members with cast-in-place (CIP) concrete and/or shear reinforcements, were collected from literature. On this basis, a practical design expression capable of estimating shear strengths of HCSs strengthened with CIP concrete and stirrups was suggested based on the ACI 318 code equation. The proposed method evaluated the shear strengths of the collected specimens with a good level of accuracy, regardless of the presence of corefilling concrete, topping concrete, and shear reinforcements.
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