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Shoring question

Shoring question

Shoring question

(OP)
Hello,
I was asked to design shoring to replace deteriorated concrete column. Never done shoring before. so, came up with the attached sketch.
It is the bottom column in a two storey parking garage. The calculated loads include the dead and live loads, although the parking spots adjacent to the column wont be used during construction, the live load was included.
Please provide any comments you have. Thanks for the help

RE: Shoring question

My only comment would be you haven't given them much room to work. With 8 posts around the entire perimeter, they will be hard pressed to avoid the shoring posts during demo. The forming and pouring of the new column shouldn't be too bad with the orientation shown.

RE: Shoring question

(OP)
Thanks jayrod12. There is about 3 ft between the posts. I thought that is enough.

RE: Shoring question

when I do shoring I try to think of all the crazy conditions that may possibly occur during the life of the shores and address them in my contract or notes or directions to the contractor. in your case if the garage is in use during the project, i'm thinking vibrations loosening connections, but also I'm thinking a crazy driver which could not take out a concrete column but could definitely take out the shores.

RE: Shoring question

(OP)
Thanks Triangled. I accounted, as you see, for some redundancy in the number of posts. Also, will ask for some safety measure to direct traffic away from the posts.

RE: Shoring question

My comments/questions:
  1. The shoring posts seem too close at 24".
  2. Check the floor slab on grade for the concentrated column loads.
  3. How do you pour the new concrete up against the bottom of the remaining capital?
  4. How will you address shrinkage of the new column below the existing capital.

www.PeirceEngineering.com

RE: Shoring question

(OP)
Good comments PEinc.
1- the posts are 24" from the face of the column. can move them to be 4ft.
2- Slab on grade is checked and was OK
3- ( not in my scope) but done something similar where the forms were made to allow pouring 1 ft of concrete head then the extra concrete removed. It worked very well.
4- ( not in my scope, as this is by others), But I think creep and shrinkage are negligible in this 8ft long segment of lightly loaded column. My estimate is less than 3/32" (2mm)

RE: Shoring question

How did you analyze the floor slab? Youre changing the moments in the slab because you just added several new hard points. In your analysis you need to replace that one existing hard point, the column, with new shoring posts several feet apart. Depending on span lengths some posts may see more load than others. You see where I'm going with this?

Given how big that capital looks, im surprised that punching, one way shear, or flexure work with these new shoring posts.

RE: Shoring question

Yea I was thinking the same thing, the first elevated slab seems questionable. possibly some spreader beams at the top and bottom of the shores could help that, but you may want to have the whole bay above the column closed off if capacity is tight.

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