ReverenceEng
Structural
- Feb 18, 2016
- 81
Often times we will use Hilti profis or Simpson designer to get values on their respective products. However, I am seeing some funny results that I don't know how to interpret when evaluating a base plate dumping a moment into anchors as with a sign or light post.
Basically, as we increase embedment, the D/C goes down as there is more resistance to tensile breakout and pullout.However, once we cross a "depth threshold" (my name for t - this is what I cant figure out), the tensile breakout capacity starts to climb, often to over capacity. How is it that 8" of embedment works great, but 24" works way worse? I don't get it. What do I not understand?
I can contact Simpson for advice, but if there is some mechanism I am not familiar with, I figure you all might know!
Basically, as we increase embedment, the D/C goes down as there is more resistance to tensile breakout and pullout.However, once we cross a "depth threshold" (my name for t - this is what I cant figure out), the tensile breakout capacity starts to climb, often to over capacity. How is it that 8" of embedment works great, but 24" works way worse? I don't get it. What do I not understand?
I can contact Simpson for advice, but if there is some mechanism I am not familiar with, I figure you all might know!