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PRYING FORCE IN ANCHOR DESIGN

 
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vnacharya
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PostPosted: Mon May 18, 2020 12:00 pm    Post subject: PRYING FORCE IN ANCHOR DESIGN Reply with quote

Hi,


During Bolted/Anchor Connection design, it is obvious to consider Prying action in to account. However, inclusion/exclusion of prying force for Concrete break out failure is the topic under discussion now.
In the present case, I am having a 16mm thk. Anchor plate on top of the RCC slab. On top of it, a central Fin plate is connected which is subjected to Tension force (Due to wind) under critical load combination. Factored Tension force (2Te) from the analysis is 58kN and Total prying force (2Q) is 89kN!! Thus, 2Te+2Q=147kN.
Under Tension load case, for post-installed  Anchor (Say HILTI) following checks are done:
1. Steel Strength Check
2. Pull out check
3. Concrete Break out strength check

As per my understanding, Prying force is an induced force which will exert an additional force on the bolts. However, if we treat Anchor plate assembly as a whole, prying is not an additive force. Thus, "I presume, Prying force is to be considered for Anchor Steel Strength Check, Pull out check. However, prying force need not be considered for Concrete Break out check". The reason for above said statement is, in the present case, as the breakout cone is larger than "Prying force region i.e. Le", within the concrete break out failure cone prying force is getting balanced or nullified.

Even though, I could have made prying force as negligible by increasing the anchor plate thickness to 25mm or through stiffeners, I would like explore the concept in detail. Hence, I would request your valuable insight regarding this. If you can suggest any specific code reference, it would be more helpful.



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