Concrete Support Walls - Construction/Control Joint Spacing 2

[tft2001]

We are working on a project with concrete walls (~18" thick) that are 16 feet tall to support roof trusses over a bulk materials handling area. These walls are to be designed as potential push walls from front end loaders.

Any thoughts on the spacing of both vertical (and potentially horizontal) construction/control joints?

 

[hokie66]

What is the truss spacing? I would place vertical control joints at a multiple of the truss spacing, possibly one half way between each truss. No horizontal control joints, but you can have construction joints if necessary.

 

[ron9876]

How long is the wall?

 

[Teguci]

Fully tie the slab on grade into the wall to transfer lateral shear. The action on the wall from the front end loader will be the reaction on the slab from the front end loader treads.

Check impact and bending for the wall. It would probably make sense to tie the trusses to the top of the wall to prevent loss of bearing and take some of the moment to the opposite side wall.

 

[tft2001]

RON9876 - The wall length varies, however, the longest is 140 feet.

 

[tft2001]

hokie66 - We are still working with the truss designer, however, the spacing could be between 2 and 4 feet o.c.

 

[hokie66]

Oh, what I would call bar joists, then? Or timber trusses. I had envisioned something bigger. In that case, the truss spacing is irrelevant.

I would tend to use control joints at about the same spacing as the height of the wall, thus 16 feet. If you go longer, you risk having diagonal shrinkage cracks due to restraint by the slab/footing. Don't skimp on the horizontal reinforcement, particularly near the bottom, as that is where the restraining force can cause crack initiation.