design of base plate on axial tension plus moment loads
design of base plate on axial tension plus moment loads
(OP)
Dear experts
AISC Design guide-1 for design base plate and anchor rod is concentrated only on the applied axial compression plus moment loads, even in the two methods (uniform and triangle) of design the base plate, my question is , shall i use these two methods in case of axial tension plus moment or these methods are not applicable for this case .
Thank you
AISC Design guide-1 for design base plate and anchor rod is concentrated only on the applied axial compression plus moment loads, even in the two methods (uniform and triangle) of design the base plate, my question is , shall i use these two methods in case of axial tension plus moment or these methods are not applicable for this case .
Thank you
Thank you
RE: design of base plate on axial tension plus moment loads
RE: design of base plate on axial tension plus moment loads
Presumably, the tension from the connected element to the anchor rods is resolved through flexure of the base plate. More tension in the rod equates to more flexure in the base plate. If the anchor bolts sit on chairs or straddle the connected element then them effect on the base plate might be minimal. It all depends on geometry.
You just need to look at the load path and figure out where the loads go.
RE: design of base plate on axial tension plus moment loads
RE: design of base plate on axial tension plus moment loads
1) For large moment that resulted in only a pair of anchors in tension, I think the case from DG1 is still applicable.
2) For small moment that resulted in all bolts are in tension, I suggest to add some weight to counter the lift force. As this case is not well addressed in literatures, as long as I can remember. (Note that net tension case does not apply, because part of the base plate will still in contact with the floor, prying action will occur)
RE: design of base plate on axial tension plus moment loads
Edit: this is a question not a challenge
I just enjoy the debate
RE: design of base plate on axial tension plus moment loads
No, I wouldn't suggest that is well covered, as the word, "assumed bending line" (Fig 3.1.1) is vague to me. The method DG1 employed was a modification to the ultimate strength design of reinforced concrete, with a pair of anchor bolt in tension, and a compressive stress block under the column compression flange. It works fine as the case I stated in my comment #1 above, but when all bolts are in tension, that is liking both top and bottom reinforcing steel are all in tension, how does that compressive stress block look then? That's the reason I wouldn't suggest it without further understanding. I think evaluation of prying action maybe one way to go, and FEM is another, if exact solution is desired.
RE: design of base plate on axial tension plus moment loads
RE: design of base plate on axial tension plus moment loads
Dik