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ajk1 said:In my opinion, corrosion was not a significant cause of collapse.
Also lack of floor slope was not a significant cause of collapse.
If water containing corrosive chlorides runs over the floor over many years, and the floor has no membrane protection, the concrete will absorb the chlorides. Guaranteed, even if loped.
Among worst rebar corrosion I ever saw was top bars in steeply slope truck ramp.
I have seen very bad corrosion and spalling, including on bridges, but no collapse, and no indication of structural distress.
This does not mean it is not serious; it should always be reapired a quickly as possible. I always add "withoutd delay". Owner must not wait till management includes it in some far off budget.
Retired P.Eng.
Ontario, Canada
JStructuralsteel said:Spartan5, If I condemned every building that had rebar issues or cracks, i would be out of business. Yes, the engineer did say its critical, but no engineer could predict this type of failure at the time of inspection. Who knows what happened even since April?
It would have to be a State wide agency, and then again, who is going to pay for it? $$$ matter, even in a disaster.
MINIMUM INSPECTION PROCEDURAL GUIDELINES FOR BUILDING STRUCTURAL RECERTIFICATION said:Cast in place reinforced concrete slabs and/or beams and joists may often show problem due to corroding rebars resulting from cracks or merely inadequate protecting cover of concrete. Patching procedures will usually suffice where such damage has not been extensive. Where corrosion and spalling has been extensive in structurally critical areas, competent analysis with respect to remaining structural capacity, relative to actual supported loads, will be necessary. Type and extent or repair will be dependent upon the results of such investigation.
2018 report said:Abundant cracking and spalling of varying degrees was observed in the concrete columns, beams, and walls. Several sizable spalls were noted in both the topside of the entrance drive ramp and underside of the poot/entrance drive/planter slabs, which included instances with exposed, deteriorating rebar. Though some of this damage is minor, most of the concrete deterioration needs to be repaired in a timely fashion. All cracking and spalling located in the parking garage shall be repaired in accordance with the recommendations of ICRt.
(maybe I'm quoting a quote?)NOLAscience (Structural)29 Jun 21 19:39 said:"So when a condo sells in this complex does the seller have an obligation to disclose any correspondence about the repairs recommended in 2018?"
NOLAscience said:The professional engineer (his stamp does not indicate his specialty; may have been 'grandfathered' in the 60s; he looks to be almost 80 years old) may have recognized that there was a problem. He gave the board his recommendations. I'm sure he expected that they would repair within a year or two. My only complaint with his report is that he did not recommend temporary shoring of the columns and slabs. That could have been done immediately, for less than $100,000, and we would not be studying this building because it would not have collapsed.
hokie66 said:Enough to pull a 12 storey building over, one with not much shear wall capacity?
warrenslo said:The pool didn't collapse, so this discussion about the pool is not relevant to the building collapse.