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pixel_of_moral_decay t1_j5gf685 wrote

Not a structural engineer.

Looks intentional to my eye.

They're aligning the downward forces directly to the below support column. Rather than built structure to transfer the load to something else (think the header of a door or window transfer weight above to the jack stud).

I believe inspections are done per floor during construction in JC, something that irks developers as it really slow the process. So an inspectors been on site each time.

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BikingVikingNYC t1_j5gmyk3 wrote

structural engineer here:

Sloping columns put some extra loads on the floors, so as long as these loads are taken into account when designing, there is no issue.

This incline is big enough that it should have been noticed during construction. The fact that they built over a dozen floors above it means it's intentional.

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a_trane13 t1_j5gnhz6 wrote

I think it’s more ideal that each column is landing on the one below, rather than using (and stressing) the horizontal structure to transfer the load.

Why they’re at a slight angle, I’m not sure. It looks like there are four floors there that are slightly wider… could be an architectural choice or something to do with building balconies.

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drkensaccount t1_j5gtuo6 wrote

My guess is that it's a different twist on the cantilevered floors Toll Brothers used on the other 2 buildings they built. Both of those have a few floors that jut out over the ones below it (a less extreme version of what Mac-Cali did with URBY. If you want better info, there's a rendering of what they're planning at the corner of Provost and Steuben.

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driftingwood2018 t1_j5h7qyw wrote

Intentional. That section of building extends further out from top and bottom of the building.

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mwssnof t1_j5haekc wrote

Some buildings not only have angled columns like these, but the columns "walk" from floor to floor, so there's always some overlap of the columns from floor to floor, some vertical transmission of the gravity load, but not completely, so the net result is a crazy stacking of pennies reaching amazing, seemingly impossible overhangs.

The way I find it helpful to think about these kinds of columns is to imagine wider columns only where there are wider balconies and longer cantilevers to support. You can then visualize the bigger columns on top of smaller ones, then topped again by smaller ones, like a narrow cylinder supporting a wide one supporting a narrow one. This way, you can imagine how the full volume of the bigger columns is actually not needed. Instead, the load shifts out towards the extended balcony/cantilever. Then, just remove the concrete you don't actually need, and use a constant diameter cylinder to form the column, and you get these angled columns.

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PICHICONCACA t1_j5hojn7 wrote

These buildings are gonna collapse in 15 years.

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gimme_alt_girls t1_j5hvlkt wrote

Looks like those floors have a larger footprint than the rest, columns are appropriately sloped I’d say

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squee_bastard t1_j5hy1ed wrote

My biggest totally irrational fear is one of these buildings around me collapsing during construction.

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jae34 t1_j5itva0 wrote

It's called walking columns or in more layman terms sloping columns, totally normal in concrete construction. We do it all the time in architecture either to clear an area or this case to pick up extra load or be within spacing constraints.

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CaptainScottFox t1_j5jc2l0 wrote

Like my fellow structural engineers have said, looks like an architectural and structural choice that is well coordinated. Or I should say a well coordinated engineered solution to an architectural choice.

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Fox_Body_Barra t1_j5jzpz2 wrote

Probably intentional, but it was built non union so you never know.

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gordan_life t1_j5kfvjg wrote

No matter what are they doing, won't change the future picture that major residents would live under the shadow when they move in.

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psynautic t1_j5kq2v5 wrote

I think it's a design choice and it'll look like it kinda bubbles outward in tthe middle there

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dpw59 t1_j5rcw4o wrote

Replying to ChuckleheadStrategy (#1,444,422)

Yup, similar to the Morgan and 10 provost, this building has a section of floors that stick out more than the rest.

They are all part of the 4 stage project by toll brothers. There’s a 4th building supposed to go at corner of Marin & Bay when they finish this.

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