Pull Thru Strength 1

[Russell10]

Looking to make an over engineered wall anchor to go thru a masonry wall. The wall is 24 inches thick and will be thru bolted to 2 24" long 5" C-Channel. I know masonry walls are not ideal to mount an anchor with large loads to as masonry wall properties can vary. However There has to be some calculation to determine how force it would take to pull the C-Channel thru the wall.The problem seems very simple to me and must have been solved in a similar capacity, however, I suppose this problem has proved to be above my abilities. Any advice on equations that might be helpful in solving this type of problem? I have attached a rough sketch of the scenario.

Also any compressive strength values for the masonry that would be on the more conservative side for a wall in good condition built in the 60s?

As always thank you for your advice

 

[dhengr]

Brantchise:
It seems to me that you have to know a whole lot more about that wall and its makeup. Actual bldg. drawings and specs. would be really helpful. A 24” thick solid grouted masonry (conc. blk?) wall is a pretty husky wall, any rebar, what f’m, etc. Wall support conditions top and bot., total height, and vert. location of 5k load, or location near wall openings, etc. Why wouldn’t pull through be governed by some sort of a truncated prism of wall shearing out/through the wall, much like the thinking of pull-out cones for anchor bolts? This does assume solid grouting. A wall made up of many wythes of brick which were not properly bonded btwn. wythes would act quite differently. But then, you also have to look at some finite effective length/height of wall acting as a vert. spanning beam from footing to roof, or a horiz. spanning beam btwn. two pilasters, or some such.

Since you work in the fall protection industry, why not study the various types of walls, and their design criteria and methods; then, using the 5k load, in any direction, what thickness of wall and f’m mins. will support the load w.r.t. the shear prism? Then, what effective wall length/height vs. span length will support the load? Build yourself a tabulation of these various approx. values which you can look at to hone in on a practical solution. This approach, rather than doing a separate analysis for ever problem you are asked about. There will also be instances where you do have to do a completely new analysis. Keep all of these calcs. and tables/graphs/nomographs, likely spreadsheets in a notebook for that kind of wall material and its construction.

 

[oldrunner]

The simplest thing to do is to pull test. We've done that on a number of brick assemblies that we had no idea what was there.

 

[phamENG]

https://www.eng-tips.com/viewthread.cfm?qid=459305

 

[Russell10]

Thank you all, oldrunner: I agree that a Pull test would be the ideal solution and it will be done, but in order to install the anchor in place it must be designed and proven to be able to hold a 5000 lbs load. dhengr: thank you for the advice it is very helpful I will and do keep a notebook for my calcs as I think this is a good practice for all engineers. I will look deeper into the type of wall I am dealing with as it appears the calculation may be more complex than I had originally thought. phamENG: Thank you I forgot that I have previously asked about this sorry for wasting you're time I will look at the ACI 530 code and get back to this post if I have any questions.

Once again thank you for all the help