Title: Web-Shear Capacity of Prestressed Composite Inverted Multi-Tee Slabs

Author(s): Sun-Jin Han, Deuckhang Lee, and Kang Su Kim

Publication: Structural Journal

Volume: 118

Issue: 3

Appears on pages(s): 295-304

Keywords: composite member; inverted multi-tee slab; shear design; transformed section

DOI: 10.14359/51730538

Date: 5/1/2021

Abstract:
Prestressed inverted multi-tee (IMT) slabs have been widely used in recent precast construction as a fast-built composite flooring system. However, there is a critical issue about its vulnerability in shear. To this end, a total of six IMT slabs were tested in this study, where the magnitude of prestress, and presences of shear reinforcement and cast-in-place (CIP) topping concrete were considered as key experimental variables. An analytical method capable of estimating the shear strengths of IMT slabs with topping concrete as a composite prestressed member was suggested by using the transformed section approach combined with the dual potential capacity concept. The proposed model can identify the shear strength and failure mode, and a simplified model was also developed and verified for its better applicability to be easily used in practice.