Title:
High-Performance Flat Plate Voided Slabs
Author(s):
Mike Mota
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
Flat-plate concrete slabs provide economical floor structures for the short spans commonly associated with mid- and high-rise residential construction. These systems typically comprise 8 in. (200 mm) thick slabs spanning up to 22 ft (6.7 m) if reinforced with deformed bars only, or up to 30 ft (9.1 m) if the slabs are also post-tensioned (PT). The purpose of this presentation is to highlight technologies that allow flat-plate floor systems to economically achieve spans in the 45 to 50 ft range (13.7 to 15.2 m) commonly used in Class A office building construction while minimizing punching shear requirements. These technologies include the application of: • ASTM A615/A615M Grade 80 steel reinforcement1; • Concrete mixtures with design strengths of 8000 psi (55 MPa) and higher; • Voided slab formers; • PT systems in which the tendons are banded over the columns in both directions.