ChesterCopperpot

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There's definitely interior structural shear walls all the way up - this is L56 for example.
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The Preservationist

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There's definitely interior structural shear walls all the way up - this is L56 for example.
View attachment 366737
That's a lot of structure and weight if solid walls and true proportions. Thanks Chester for digging up the engineering drawings, it provides some explanation of the massive reinforcement we're seeing in the podium.

Edit: I'm interested to see if they pour all the vertical elements at once as per the last floor. That might suggest other things at play such and structural rigidity and lateral load transfer. Never seen anything go up like this.
 
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UpwithOlives

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That's a lot of structure and weight if solid walls and true proportions. Thanks Chester for digging up the engineering drawings, it provides some explanation of the massive reinforcement we're seeing in the podium.

Edit: I'm interested to see if they pour all the vertical elements at once as per the last floor. That might suggest other things at play such and structural rigidity and lateral load transfer. Never seen anything go up like this.
Absolutely for lateral loads and structural rigidity. State of the art for a tall skinny residential building. St. Regis in Chicago had a similar amount of concrete walls across the three masses for the same reason. And still required a blow-thru floor to minimize sway.
 

whatever

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Very, very interesting to see/hear some of the engineering details. I'm more used to the erecting side than the math side, so it's always appreciated to learn more about the "why" vs the "how". If the shear walls are needed to deal with the lateral wind loads it's all starting to make sense. This thing is unlike anything we've seen in this city.
 

The Preservationist

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Absolutely for lateral loads and structural rigidity. State of the art for a tall skinny residential building. St. Regis in Chicago had a similar amount of concrete walls across the three masses for the same reason. And still required a blow-thru floor to minimize sway.
Hi UpwithOlives, just to continue if I may with your thought process thinking there is a relatively static podium attached to a dynamic tower exposed to lateral loading. I'm thinking one would need to bolster up the structure at the bottom of the tower for several floors to dissipate concentrating forces at the podium to tower elevation. Thoughts?
 

UpwithOlives

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Hi UpwithOlives, just to continue if I may with your thought process thinking there is a relatively static podium attached to a dynamic tower exposed to lateral loading. I'm thinking one would need to bolster up the structure at the bottom of the tower for several floors to dissipate concentrating forces at the podium to tower elevation. Thoughts?
Getting beyond me - I’m just an interested observer, not an engineer or architect. That being said - I believe that’s what we’ve seen in floors 3-6. I think of the 5th floor as the basement with the elevator pits, tied into all the steel columns in the fourth and third levels, which then carried down to ground level through the massive diagonal columns in the first floor space. That first floor also had a significant steel structure in the concrete floor between the super columns.
 

MichaelZ

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I’m surprised the developer didn’t secure the extra small buildings south, it would have saved a lot of time and money for construction, etc…
 

khaldoon

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