G4 - Describe Suspended Slabs Flashcards
What is the difference between a flat slab and a flat plate slab?
A flat plate slab has a plain soffit
A flat slab will have a drop panel or column capital
What advantage do column capitals give?
1) Increase shear strength
2) Reduce the span
What direction does load carrying steel span?
Perpendicular to the beam (think of a cross)
Which type of slab are dome pans used?
Two-way slabs (Waffle)
What is a spandrel beam?
Location: Perimeter of the slab - beam around the perimeter of the slab
How does a two-way joist system differ from a single-joist system?
Two-way joists run in two directions
One-way joists run in one direction
What is a flat PLATE slab?
Simplest form - even thickness throughout, when stripped, no features in soffit.
Free spans from support to support and relies only on own strength and rebar to hold it up.
What is a FLAT slab
Added features to a FLAT Plate Slab:
The column holding up the slab will have: column capital or drop panel or both to help support the slab.
What is a one-way slab?
Refers to a slab with some support from column to column, such as a beam.
What is a two-way slab?
Dome pans are used and are installed in grid pattern. Load-carrying steel runs in both directions
What is a one-way ribbed slab?
Uses a series of metal pans secured end-to-end to the slab deck to create a joist pattern in the slab. Poured monolithic with the slab and allowed slab concrete to be quite thin. Reduces some dead load of the building
What is a two-way ribbed slab?
Similar to the one-way-ribbed, except dome pans are used and installed in a grid pattern. Creating a waffle pattern.
What is a slab band (Ribbon Beam)
Similar job as the drop panels, except they span continuously from column to column, usually in one direction only.
Spans get longer and slabs become heavier, girders span from where to help support?
Column to column, with intermediate beams between girders.
