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Design of column footing on rock with passive rock dowel

Design of column footing on rock with passive rock dowel

Design of column footing on rock with passive rock dowel

(OP)
Hi there,

My current task involves a design of column footing foundation on rock. Due to large uplifting force from wind, the footing size gets quite big to achieve the stability FOS. Therefore I am wondering if it is possible to use passive rock dowel in the calculation for the uplifting force.

I am new to foundation design and I look up online but didn't find too much resources about this. Any recommendation or references that I can use would be appreciated.

Regards,

Eric

RE: Design of column footing on rock with passive rock dowel

Yes, dowels can be used. Analise, Design & Install as Rockbolts or micropiles, if loads are high.

RE: Design of column footing on rock with passive rock dowel

You can use rock anchors. When designed for tension, I wouldn't call them "dowels", because dowels are normally for shear.

RE: Design of column footing on rock with passive rock dowel

rock anchors are generally tensioned, so I would not call them passive either.

RE: Design of column footing on rock with passive rock dowel

cvg,
That is probably true for most uses of rock anchors, but when used to resist uplift due to wind, I think the most common way is just to grout them in. In competent rock, it is sometimes much more economical to drill a hole and grout in a reinforcing bar than to provide a big hunk of concrete. Depends a lot on the availability of equipment for the different methods for providing ballast against uplift.

RE: Design of column footing on rock with passive rock dowel

(OP)
Thanks, emmgjld and hokie66. When comes to the calculation of bearing pressure due to the wind load(it is uplifting and overturning moment), how do I include the strength of the passive rock anchor? Is there any reference or standard that I can use?

Eric

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