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:

Issue:

Appears on pages(s):

Keywords: core-filling concrete; hollow-core slab (HCS) ; individual mold method; precast concrete; shear; topping concrete

DOI: 10.14359/51742141

Date: 7/31/2024

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 concretes, and also the magnitude of effective prestress. The sheer 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 the literature. On this basis, a practical design expression capable of estimating the shear strengths of HCS 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 core-filling concrete, topping concrete, and shear reinforcements.