Jump to content

500 Crawford: Multifamily At 500 Crawford St.


lockmat

Recommended Posts

  • 2 weeks later...

One of mine. Viewed through the fence around the Catalyst lot. 11/22:

IMG_20141122001_zps1fb3cc33.jpg

That is good quality construction. Fein is one of the few developers using metal studs and fiberglass sheathing instead of wood studs and wood or paper sheathing. Hines did the same at the waterwall building.

If I was an institutional investor, these are the buildings I would want to buy.

  • Like 4
Link to comment
Share on other sites

  • 2 weeks later...

Not sure if someone has mentioned this, but it seems they're focusing on the south side of the garage first so that they can start leasing more quickly than if they did both sides at the same time. Dirt is the only thing on the north side so far.

 

Yeah I noticed that as well. Makes sense too because that's the side which will get the most foot traffic.

Link to comment
Share on other sites

  • 3 weeks later...
  • 2 weeks later...

LOL. See those DOKA shoring posts in the foreground on your second photo? Those are Floor prop Euro Tops by DOKA. We use them on some projects. See the flange mid-height with the bolt keeping them together? 

 

Theyve stacked the shoring posts to reach the elevation they wanted.

 

Big no no. In fact, really dumb. 

 

http://www.doka.com/_ext/downloads/downloadcenter/999801702_2010_09_online.pdf

 

Page 10 of the technical data sheet:

 

 

Do not attempt to use floor props

one on top of another.

 

 

  • Like 2
Link to comment
Share on other sites

And just to add, Buckling force of a beam/column thats axially loaded is a function of the length Squared. So by stacking their shoring posts like so, they effectively doubled the length, and reduced the buckling force by a factor of 4. So, according to their technical data sheet, the capacity is 40 KN, which, in Imperial is 9000 lbf (or 9 kip shoring post). By doubling the height of the shoring post--- they basically turned it into 2000- 2500 lbf shoring post: Assuming it as sufficient lateral stability to maintain that load. Of course Doka wouldnt sign off that...

 

 

Who the hell signed off on that?    :lol:

 

 

 

 

  • Like 3
Link to comment
Share on other sites

alright, picture your typical grade school ruler. 

 

I have a 6'', a 12'' and then a yard stick(36 inch).

 

 

Imagine it has a rectangular cross section.

 

 

Imagine for a moment you place each end of the ruler into the palm of your left and right hand and pressed together. At 36'' that ruler starts to bend outward (or inward) --- That is buckling. 

 

Buckling force(in general mechanics of materials: more on this later) is equal to  pi*E*I/(KL)2. Buckling force is the force it takes for the 'column' to start deflecting laterally. 

 

PI of course is 3.14

E is known as Young Modulus, which is a measurement of the stiffness of a uniform elastic material. The values of wood are based on the species and vary a decent amount. For steel and Aluminum there are tables providing these values.

I is known the second moment of area, or moment of inertia. Which is based on the cross sectional shape of the object in question. This value can either be derived with calculus, or for simpler shapes (like rectangles or circles), looked up in tables. 

K is a constant value. That changes based on how the column is supported. I won't go into each value, but for simplicity sake, its 1.0 

L is the value of non-Braced Length. So in each case the value is 6, 12, and 36.

 

Okay, now since all 3 rulers are the same species of wood. Same cross sectional area. Same bracing method. The only thing that is different in each of them is L.

 

6 Inch

 

Buckling Force= piEI/36in2

12 inch


Buckling Force= piEI/144in2

36 inch

 

Buckling Force= piEI/1296in2

 

Lets say Mr Bigfoot works out in the gym and presses the ends of the 6'' ruler together with 150 lbs of force and snaps the 6'' ruler. It does a number on your hand though... and cuts your palm. To do the same with the 36 inch ruler... you need 4.1 lbs of force to break the yard stick assuming same material and cross section. 

 

Now, I indicated before in general mechanics of materials. That equation only  works off of the ideal assumption that the geometry is the same throughout. These guys doubled the length of their "ruler" or shoring post. And theyre banking on that little dinky bolt in the middle to resist all the stress of the lateral deflection. Shoring posts are designed many times so that negligible deflection occurs. These guys stacked the shoring posts, increased the likelyhood of deflection occuring: bad new

  • Like 2
Link to comment
Share on other sites

This building has been under construction for, what?, 18 months?

Is it just me or is it progressing quite slowly?

I don't think it had been going that slowly. Didn't they have to demo, site prep, etc before foundation and going up?

So it looks like the second half of the building has yet to start. Then the garage will be a centerpiece.

center piece literally or figuratively? It might end up being both if they do it right.
Link to comment
Share on other sites

So it looks like the second half of the building has yet to start. Then the garage will be a centerpiece.

It looks like they're about to start the other half. On the Crawford side, they've started throwing up the first pieces of metal framing for the apartment building. On the La Branch side, foundation work for the other side is visible through a hole in the fence wrapping.

What can't be forgotten is the Prairie half was essentially a staging area for the project. That's why it was delayed.

Edited by tigereye
Link to comment
Share on other sites

  • The title was changed to 500 Crawford: Multifamily At 500 Crawford St.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...