Concrete Portal
Concrete Portal
(OP)
Attached is an elevation of a concrete portal and I'm looking for information about the development and anchorage of the bottom reinforcing steel and where others would consider the 'beginning' of the support. In Canada, our code requires the span to be considered as the clear distance plus the minimum of (the depth of the member or the width of the support). Our CSA Code is similar to the ACI... Bar sizes are 35M (Similar to a #11 bar...






RE: Concrete Portal
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Concrete Portal
The concern I have is the splicing of the reinforcing and cut-off locations (bars in this locale are 59' and 5 - 35M fit snugly in one layer with no provision for bundling). I'm looking for a rationalisation for commencing the 'start' of embedment length at or near the forward edge of the haunch.
The actual design moments are predicated on a span centre to centre of column and not the clear span at the haunch plus the depth of the beam.
Dik
RE: Concrete Portal
BA
RE: Concrete Portal
While I don't understand what is going on, the way to design this joint in my opinion is to use the strut tie method (the Canadian code is the best for the strut tie in my opinion). using this method you will get nodes, which you must develop your steel past.
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Concrete Portal
Dik
RE: Concrete Portal
forgot to add that I would normally use the inside edge of the haunch as the starting point with the span length equal to the clear haunch distance plus the depth of the beam at each end.
I'm trying to avoid splicing the 35M bars due to the limited length of 59' and cut-off points I can use. The loads are 'real' and high and I'm looking for some background on the approach. I can find no reference material on haunches and the effect they have on reinforcing steel at their location. I want to avoid 'adding' an additional 4' or so to the bot rfg.
Dik
RE: Concrete Portal
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Concrete Portal
Dik
RE: Concrete Portal
RE: Concrete Portal
It sounds like you need to improve your understanding of the fundamentals behind the code clauses. Once you understand this then the answers to questions like this fall into place.
This is what code commentaries were invented for.
As engineers we don't just need to know, we need to understand.
RE: Concrete Portal
Dik
RE: Concrete Portal
RE: Concrete Portal
Dik
RE: Concrete Portal