N.A. Location, doubly reinforced beam
N.A. Location, doubly reinforced beam
(OP)
Any body has any step by step guide for it. I know the formula.
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N.A. Location, doubly reinforced beam
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N.A. Location, doubly reinforced beamN.A. Location, doubly reinforced beam(OP)
Any body has any step by step guide for it. I know the formula.
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RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
I developed it for T-beams, but if you have a rectangular beam, just use b=0. The top part of the spreadsheet is for a quick strength check. The bottom is what you're interested in. Only input the boxes shaded yellow.
RE: N.A. Location, doubly reinforced beam
Cannot open it MS excel 97
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
Mike McCann
MMC Engineering
RE: N.A. Location, doubly reinforced beam
It has to be a fairly good distance above the NA to do anything for the moment capacity, not just above it. More importantly, however, is it's role in deflections, specifically long-term deflections. I've rarely had a situation where I needed compression steel for strength, but often need it for deflections.
RE: N.A. Location, doubly reinforced beam
How does providing compression steel reduce the long-term deflections? Apologies for asking questions within someone else's post
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
In the context of AS3600 it reduces kcs, the load multiplier for long term deflection.
RE: N.A. Location, doubly reinforced beam
SEIT and apsix have given you code based answers. Compression reinforcement in practice makes a concrete beam act more like a steel beam. So it removes some of the creep deflection. Steel beams don't creep.
RE: N.A. Location, doubly reinforced beam
I believe in ultimate strength it will shift more up?
RE: N.A. Location, doubly reinforced beam
You are correct. So bars that may not be compression bars for strength considerations could conceivably be compression bars for serviceability considerations. I'm not sure I would want to cut the gnat's behind that close on a regular basis, but I thought I would mention it because I was faced with this about 1.5 years ago.
RE: N.A. Location, doubly reinforced beam
Dik
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
RE: N.A. Location, doubly reinforced beam
You can access almost all of his authored spreadsheets by doing a google search on him. He's got a bunch. The websites might not have his latest revisions to the spreadsheets though. This one in particular, is the latest and greatest of this program. I don't know how often he updates "Alex's Corner" but we (the company I work for) get his revisions as soon as he sends them. His spreadsheet index with most of the current revisions is attached. We got a couple this week and I don't think he's updated the MS Word document yet.