Replacing circular stirrups with spiral
Replacing circular stirrups with spiral
(OP)
If the specification for stirrups is 9" O C what will be the pitch of 9 for the spiral replace the stirrups adequately?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Replacing circular stirrups with spiral
|
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
Mike McCann
MMC Engineering
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
Like hokie recommended, if it is a pile make sure they have and extra flat turn at the bottom for full development.
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
What concrete code do you use?
My reference was meant to say ACI 318-05 7.10.4.3
RE: Replacing circular stirrups with spiral
As hokie mentioned above, Cl 10.7.3.3.b
The spacing of ties or the pitch of a helix should not exceed the smaller of D (diameter/depth) and 15db for single bars.
RE: Replacing circular stirrups with spiral
Attention to shear in building columns has not been precisely a favorite theme; even the more used program for building structures here (CYPECAD, which is by now quite an achievement from the viewpoint of entry of data and detailing, so the production of plans) has started to contemplate the check some years ago (not many). This is not to say the EHE code was negligent, that was not; more a thing of practice.
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
RE: Replacing circular stirrups with spiral
This issue intrigued me, so I looked it up in ACI318-08. The way I read it, you are certainly correct for a "spirally reinforced column" to get the higher capacity. But I think you can use the provisions for a "tied column", with a spiral used as a "continuous circular tie" with the same pitch as the required tie spacing. See the Commentary to Paragraph 7.10.5.
RE: Replacing circular stirrups with spiral
You got it right, this what I was looking for, I have drilled piers with 4 #5 bars to be tied up at 9" OC -- the spiral with 9" (or less) pitch will do the job.