SLENDERNESS RATIOS FOR REINF. CONC WALLS?
SLENDERNESS RATIOS FOR REINF. CONC WALLS?
(OP)
I've been asked by an architect client to shave down the thickness of my standard 8" concrete walls to 6" thick for architectural reasons, but the walls are 8'-4" high. They look so tall and thin. I've never needed to push the envelope in concrete wall slenderness this much before in my practice and wondered if ACI318 or any other paper might cover limits to the slenderness ratio of reinf. concrete walls? Anyone know?






RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
Dik
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
Just a thought.
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
Even so, you might consider some assumed "moment amplification" due to slenderness if you feel uncomfortable. Though, my guess is that it will be not as significant as you would think it would be.
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
BA
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
how do you tie those? and where do the horizontal bars go?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
With wire ties.
Just place the horizontal bars between the staggered verticals, tying one bar off to one side, the next horizontal bar the opposite side, and so on up the height of the wall. Works if the vertical bars are no larger than a #5, with #3 horizontals.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
ACI 318 gives criteria for designing walls as compression members. I would use column criteria with the appropriate k and I. I would check the design against the empirical method in ACI.
I would be more concerned with what size footing to use than with the wall thickness.
I would guess that 6" would work fairly easily.
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
I wouldn't worry about double mats- just put one in the middle.
You will probably need #5 verts, spaced around 10" o.c Use #4 at 12" o.c. horizontally. Your cracking should be minimal.
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
RE: SLENDERNESS RATIOS FOR REINF. CONC WALLS?
You are correct - horizontals on the outside, but staggered face to face - sorry - I had a brain freeze. It's what I was thinking with the 4" d, but didn't come out that way.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask