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YEOMAN WORK, CHARLIE. MANY THANKS!!! And a gold star.

The side of that column looks like it has been patched with some sticky repair patch. The proper repair of rusted rebar and cracked concrete is to remove any loose concrete, clean rebar, coat rebar with coal tar epoxy, and patch concrete with hi adhesion high strength polymer modified concrete...

Could you please show me where this detail is? Sounds interesting and I missed it. Thank you,

Would not a Conco Owner's insurance policy provide moving expenses and cost of alternate housing for a period of repairs? EDIT: As a conco office owner the overall condo association policy covers the building shell and grounds and common areas and loss of rents, etc.

Sorry - I missed the consensus on Commentaries. But as far as I know the "double area" of bars at a lap splice was not defined prior to ACI 318-77 and it was later editions which defined the reason and application, with the concern being congestion and correct concrete placement. It is a...

OOPS. Spoke too soon. The Commentary on Column Reinforcement in the 1977 ACY 318 DOES address a 4% maximum reinforcing limit as follows: 10.9.1 The percentage of reinforcement in columns should usually not exceed 4 percent if the column bars are required to be lap spliced. So does the term...

That's it !! Sectiom 10.9.1 LIMITS FOR REINFORCEMENT OF COMPRESSION MEMBERS. 10.9.1 Area of longitudinal reinforcement for non-composite compression members shall not be less than 0.01 not more than 0.08 times gross area Ag of section. I see nothing mentioning lap zones. It is my thought that...

Many thanks for posting the ACI thumb drive section, Charlie. The section had reinforcing cover and placements defined, but no limits for column reinforcing. Paragraph 7.7.5 addresses "corrosive environments or other severe exposure conditions" and suggests (? requires?) greater cover and more...

The should have been somewhere and that will show whether this was what happened or not. Wonder which pile they are in?

Charlie - I think you are onto something. Most punching shear failures leave concrete from the slab on top of the columns. The pics of the UK parking structure show that. Four way flat slabs have tension on the bottom face, and therefore probably cracks, over most of their area, due to the...

Do they never use salt on the streets in the winter? So it was not the concrete thickness that defined the quite regular rectangular failure perimeter. Too much reinforcing terminated at one location? Thanks,

Charlie - notice the size of the remaining slab atop the column - particularly relative to the column ? It appears the Piper's Row Car Park slab had drop panels at the columns. Note that image having what looks like a 4 foot square section of slab remaining and compare that to any of the...

If I am not turned around, the column would be one bay (+?-) west and one bay north of the corner of the pool - right? The column in your pic just posted with number 40 (or is that 43) painted on its surface? EDIT - Nope - Sheet S2 shows it as the next column north of one marked 40/43?. I...

Apologies - My comment was directed to the bundle of #11s bent over to the left. The single bar at the first photo looks like a single #4 - maybe a #5. I cannot tell if there were more bars. That is far less than a structural column would have used. In the second pic the worker is holding...

Perhaps an M1A1 Battle Wagon (Abrahms tank). We can more accurately surmise that the rebar is not GREATLY corroded - it took some severe bending without snapping. Thus shifting focus to concrete quality at the time.

That is an impressive production. Very well presented. Many thanks for the link. The presentation is so "real" and complete it brings to mind something that has bothered me over the last 20 years or more - it MUST NOT be allowed in a court proceeding. It is too convincing. All they left out...

Yes - and for the experts performing inspections and recommending repairs. I aam sure the attack attorneys will ask if the engineer followed these practices should they get involved.

The interesting one is about flat slab structures - like CTS. It has been downloaded over 1800 times. It is either 13 or 18 pages. @Charlie - It could be a good thing to have all these in the library for this forum - while they are free. Now there is the beginning of a code to guide(?) the...

A new one to me but I LOVE it. Thank you!

Excessive reinforcing at splices inhibits good concrete in that region, possibly leaving rock pockets and poorly consolidated/compacted concrete. Do not know about the beam to column joints or beam to beam joints. That is typically easier to use a vibrator and improve the density of concrete...