WWF in concrete over metal deck
WWF in concrete over metal deck
(OP)
Here is something that I always wondered about...
In the Vulcraft Deck catalog, for a concrete slab poured over metal deck, they sometimes recommend WWF that are less than the minimum ACI requirement for slabs.
Do some engineers use less than the ACI minimum? How is this justified?
Can the area of the composite metal deck be used to meet the ACI minimum steel requirement? What about form deck?
In the Vulcraft Deck catalog, for a concrete slab poured over metal deck, they sometimes recommend WWF that are less than the minimum ACI requirement for slabs.
Do some engineers use less than the ACI minimum? How is this justified?
Can the area of the composite metal deck be used to meet the ACI minimum steel requirement? What about form deck?






RE: WWF in concrete over metal deck
CIV 3221 Building Technology Course
Monash University
Australia
Composite Floor Slabs Lecture
RE: WWF in concrete over metal deck
RE: WWF in concrete over metal deck
Kind of strange....
RE: WWF in concrete over metal deck
RE: WWF in concrete over metal deck
RE: WWF in concrete over metal deck
I believe that the rows of design capacities given in the deck catalogs are there in case you want to check an older existing slab OR, it is to account for the fact that deck slabs are designed to allow some cracking at supports (as per mrengineer's comment above).
Also, you can always add fiber reinforcing - not for strength - but to miminize shrinkage cracking.
One of the "goals" of the ACI Chapter 7 shrinkage reinforcing is to help to keep the concrete slabs together and distribute concentrated loads across wider areas. The metal deck sort of does this.
The deck specification also addresses the fact that the designer can neglect the concrete in the ribs for temp/shrinkage calcs.
RE: WWF in concrete over metal deck
Take a look at the free .pdf download titled "Designing With Steel Form Deck" at the Steel Joist Institute web site:
http://www.sdi.org/whites.htm
The Steel Joist Institute does not address your question but has the basic steel joist document for free .pdf download at:
www.steeljoist.org/publications/
They will make you register to get it, but that seems to be the only requirement.
As JAE says, if you use fiber reinforcement, be sure that it is ADDED not SUBSTITUTED for wire mesh. The referenced SDI paper addresses this subject.
RE: WWF in concrete over metal deck