25 Story Apr Bldg Coming Down in Seattle
25 Story Apr Bldg Coming Down in Seattle
(OP)
Check this out:
http://ww w.thesunbr eak.com/20 10/04/11/w ho-killed- belltowns- mcguire-th e-cast-of- characters
The article points to a structural firm I worked for in the mid 80's. Further points to a water ingtrusion problem as the cause of the problems.
This is an expensive mistake for a lot of people, and will not be the last found I fear from the list of projects mentioned.
http://ww
The article points to a structural firm I worked for in the mid 80's. Further points to a water ingtrusion problem as the cause of the problems.
This is an expensive mistake for a lot of people, and will not be the last found I fear from the list of projects mentioned.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask






RE: 25 Story Apr Bldg Coming Down in Seattle
BA
RE: 25 Story Apr Bldg Coming Down in Seattle
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 25 Story Apr Bldg Coming Down in Seattle
I have to say though, that I rather agree with BAretired. I would rather not design PT slabs ever again, as there are just way too many problems associated with them.
RE: 25 Story Apr Bldg Coming Down in Seattle
Dik
RE: 25 Story Apr Bldg Coming Down in Seattle
Must not have been due to water leaks since PT garages are fairly common without problems.
RE: 25 Story Apr Bldg Coming Down in Seattle
RE: 25 Story Apr Bldg Coming Down in Seattle
I would like to see provisions for localized member replacements built in to design documents. This way wholesale replacement of structures might be avoided or delayed. Seeing what I have seen, I really wonder what the future holds for PT box girder bridges that have tendons in the deck slab.
RE: 25 Story Apr Bldg Coming Down in Seattle
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 25 Story Apr Bldg Coming Down in Seattle
PT on bridges typically has a minimum of 3 level protection. they are grouted inside galvanized steel ducts embedded in the concrete deck.
RE: 25 Story Apr Bldg Coming Down in Seattle
RE: 25 Story Apr Bldg Coming Down in Seattle
The building was valued at 60 mil, but the repairs 80 mil.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 25 Story Apr Bldg Coming Down in Seattle
Do you know if they used an encapsulated system at the ends?
RE: 25 Story Apr Bldg Coming Down in Seattle
Don't know if the system was encapsulated either...
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 25 Story Apr Bldg Coming Down in Seattle
RE: 25 Story Apr Bldg Coming Down in Seattle
The strands are normally covered with grease which is presumably a corrosion inhibitor, but in the past, the grease has emulsified over time allowing corrosion to occur.
Water enters the plastic sheath and flows to the low point of the strand which is usually about midspan and that is where corrosion is likely to be found.
Sometimes the guys on the job are pretty careless about the way they drag the plastic sheaths over reinforcement. It is not uncommon to find a hole in the plastic sheath where it rubbed against something. All it takes is one little hole to let the chlorine ions in.
BA
RE: 25 Story Apr Bldg Coming Down in Seattle
And I thought this was an interesting quote too:
"The building's owners — a joint venture between a Seattle Carpenters Union local and a union pension fund."
The present and future pensions of a lot of locals are going to be affected here too. Not good for business...
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: 25 Story Apr Bldg Coming Down in Seattle
RE: 25 Story Apr Bldg Coming Down in Seattle
Also, the smallest reinforcing bar is much larger than one wire of a seven wire strand. The exposed area per unit volume of material is much less for a bar, making it less likely to corrode than PT strand.
Finally, PT strand is stressed to very high levels throughout its life in the structure. This makes it subject to stress corrosion cracking which is not an issue with conventional reinforcement.
BA
RE: 25 Story Apr Bldg Coming Down in Seattle
http://www.themcguire.com/
Scroll below the pictures to the 6 engineering reports listed and read - very interesting.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask