Miami Beach, Champlain Towers South apartment building collapse, Part 12 60

[SFCharlie]

A continuation of our discussion of this failure. Best to read the other threads first to avoid rehashing things already discussed.
Miami Beach, Champlain Towers South apartment building collapse
Miami Beach, Champlain Towers South apartment building collapse, Part 02
Miami Beach, Champlain Towers South apartment building collapse, Part 03
Miami Beach, Champlain Towers South apartment building collapse, Part 04
Miami Beach, Champlain Towers South apartment building collapse, Part 05
Miami Beach, Champlain Towers South apartment building collapse, Part 06
Miami Beach, Champlain Towers South apartment building collapse, Part 07
Miami Beach, Champlain Towers South apartment building collapse, Part 08
Miami Beach, Champlain Towers South apartment building collapse, Part 09
Miami Beach, Champlain Towers South apartment building collapse, Part 10
Miami Beach, Champlain Towers South apartment building collapse, Part 11

SF Charlie
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[SFCharlie]

I'm not seeing strings of geophones laid out

Nop, Neither do I.


SF Charlie
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[FacEngrPE]

This paper Pile capacity using dynamic analysis has a reasonable explanation of the dynamic pile test. It is covered by ASTM D4945 Standard Test Method for High-Strain Dynamic Testing of Deep Foundations.

 

[SFCharlie]

were the clips you sent from a 1995 edition of ACI 318? If so that leaves me wondering how the 1977 edition addressed this.

1. I don't know.
2. the posts upstream are from the 2014 version
3. I don't think it has changed much?
4. Chapter 8 is labeled:
"ANALYSIS AND DESIGN GENERAL CONSIDERATIONS ......... 318-77" <- I don't understand this?


SF Charlie
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[dik]

More than a recommendation... those that 'Be' will rain down h*llfire and brimstone on those that mess with it.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

@FacEngrPE... thanks for the link; it's good.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[apper.42]

FYI

Was your post from the 1963 code, it sure looks familiar; like the code that we used at university.

 

[dik]

It was from ACI 318-11... the following is from from ACI 318-63

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1630296884/tips/p22_cppehu.pdf[/url]

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[SFCharlie]

Was your post from the 1963 code

If it was, It hadn't changed a whit by 1995
edit: Nop, same hand written note (page 113, top of right hand column "UBC ZONES 3.4") in my 1995 and DIK's chapter 10

 

[AutisticBez]

Also, based on the drawings, what % were these columns set to be?

I would be interested in knowing about the columns that failed.

 

[AusG]

I just looked back over the 1979 column schedule. (Item 4 at

https://surfside.one/public-records-search/).

Column type D (16"x16" w/ 12 of #11 rebar) has 7.3% rebar at basement level and column G (14"x18" w/ 10 of #11 rebar) has 6.2%. Column type L has 5.3% at the basement. Those are the most packed. These may not be as built but it was the only column schedule I could lay my hands on. I know the over-packed rebar idea has come up before, sorry if this old news.

 

[TheGreenLama]

Just a thought on applicability of Dynamic Load Testing of CST Franki piles. I'm not familiar w/ this testing method, but to get useful results don't you need a fair degree of precision in both the pile length and it's cross sectional area? Franki piles have a bulb of unknown size at base. And do we have as-built pile lengths for CST?

 

[sgw1009]

Traveled to the east coast last week, and could not help but notice the massive shear walls in the parking garage under the Target store in King of Prussia, PA. Might not have noticed them two months ago, but they sure stand out now. This picture shows 3 of them, but there were probably 8 overall.

 

[MaudSTL]

Aaaaaaaannnnddddd…they’re off! The Miami Herald says that live bidding on 8777 Collins Ave. will be scheduled. “Surfside’s Champlain Towers South site on the market. Live bidding planned.“

>>>>>Edit: More late-breaking news.

South Florida Officials Hold Discussion Regarding Safety Improvements Following Surfside Condo Collapse

Museum Preserves Surfside Memorial Wall for Building Collapse Victims

 

[AusG]

I expect the new design will emphasise solidity and permanence, and stay within the limits of local materials and technology. Link

 

[dik]

SFC... do you have it as a *.pdf?

thanks...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Jeff Ostroff]

I have the 1995 version in PDF FORMAT of the ACI-318-77 spec, which is actually called ACI-318-95.

Let me know if anyone wants it. I searched high and low and cannot find anyone with the "77" version who doesn't want $200 for a stinking PDF!

Also, I uploaded a video the other night where I added my graphic overlay of the parking garage over NIST's video of the empty garage floor "hockey rink", to aid visually what is going on at the site, and identify where ground zero is.

 

[AutisticBez]

AusG, and that isn't at the splice right? Which means at the splice, this could be even worse?

 

[SFCharlie]

I have the 1995 version in PDF FORMAT of the ACI-318-77 spec, which is actually called ACI-318-95.

I had already put a link to that above.

Depending on your PC, you might try downloading the .pdf:

ACI 318: Building Code Requirements for Reinforced Concrete
It's Big
(finally got it to open, it's the 1995 version.)

 

[Jeff Ostroff]

Here is the overlay I made on top of a screenshot from the NIST drone flyover, showing the locations of the important columns, plus a tiny embedded screenshot of the tourist video showing approximately where they were seeing all the debris landing on the garage floor.

 

[AusG]

and that isn't at the splice right?

No, that is the straight column schedule, but just for the basement level. The steel decreases rapidly upwards. IDK how often a splice is required but yes, a splice near the basement level would be very crowded.