Title:
Wide Module Joists for Floor and Roof Decks
Author(s):
L. E. Svab and W. T. Scott
Publication:
Symposium Paper
Volume:
107
Issue:
Appears on pages(s):
29-41
Keywords:
concrete construction; concrete slabs; detailing; floors; formwork (construction); framing systems; joists; one-way slabs; thickness; reinforced concrete; reinforcing steels; roofs; structural design; Structural Research
DOI:
10.14359/2916
Date:
6/1/1988
Abstract:
Cast-in-place concrete one-way ribbed slab decks are undergoing an evaluation. Slab thickness established by fire rating requirements and considerations of minimizing formwork labor and maximizing material economy have dictated a departure from the use of traditional 20 and 30 in. wide joist forms. Wider joist forms are being increasingly used to answer these considerations. Wide module joist systems generally have 6 to 8 in. wide ribs at 5 to 6 ft centers with 4-« in. top slabs and are supported by wide beams. The ribs are designed as T-beams rather than joists. ACI 318-83 design requirements are not pinpointed for the evolved slab/joist-beam system. Presented is an attempt to interpret and apply ACI 318-83 design requirements together with detailing and design considerations that are unique to this framing system.