Hairpins
Hairpins
(OP)
When using hairpins and Welded Wire Mesh in the concrete slab, does the mesh have to be present throughout the entire length of the rigid frame, from hairpin to opposing hairpin, or can the mesh terminate beyond the length of the hairpin?
The contractor, to combat the rising steel price, would like to use fibermesh in the center portion of the slab.
Thank you!
The contractor, to combat the rising steel price, would like to use fibermesh in the center portion of the slab.
Thank you!






RE: Hairpins
DaveAtkins
RE: Hairpins
From this reference and other material published on the design of hairpins I believe that it is good practice to have the reinforcing be continous across the floor slab.
RE: Hairpins
Further, to make this reinforcing effective, to what extent must the reinforcing be lapped?
In the case of a lean-to addition to an existing building, I believe the floor and reinforcing should be tied to the existing building. Any suggestions?
Thank you!
RE: Hairpins
DaveAtkins
RE: Hairpins
RE: Hairpins
RE: Hairpins
DaveAtkins
RE: Hairpins
The author of the metal building book emphasizes that placing reinforcing across control joints will only leave you with cracks not at the control joints.
DaveAtkins,
The reference i used for slabs on grade states that reinforcing should always be stopped across a control joint. This is also the case in any ACI slab publications, or if you look at any generic details of control joints on the web. Why would this not apply to steel buildings?
Does any one else find it suspicious that the MBMA and any building manufacturer that published foundation design guides no longer offers them? I think there was too much liability in specifying what is usually considered a non-structural item (a floating slab) as a structural component. I tried contacting Butler Buildings who still advertises a design guide on their website. I spoke with three different people and each one of them was shocked that the design guide was mentioned on the website. Hmmmmmm.