Anchor Bolts forces 1

[skylite]

Some of us are only familiar with bars in reinforcement concrete. Is there any rough guidelines or references to practicing engineers on the forces of anchor bolts on concrete pedestal... I'd like to double check on existing plans with regards to the strength of anchor bolts placement and spacing near edge of concrete support for example.. What is the equivalence of bolts in RC bars reinforcement, are you supposed to compute for yield.. or it is mostly shear? Do you compute for the exact values of the forces going on in the bars like Fs? But bars don't seem to have grade.. like grade 60 in bars.. does it?

 

[bridgebuster]

In many older structures the anchor bolts were typically A307 steel.

 

[skylite]

In many older structures the anchor bolts were typically A307 steel.

In reinforced concrete structure.. the rebars are mostly to do with yield strength. How about in anchor bolts.. does yield strength dominate or shear strength (3/4 of yield strength) or is it more of development length of the anchor bolts (and others).. which dominate mostly? How do you compute for it?

 

[JStephen]

Refer to ACI 318 Appendix D.
Anchor bolts do come in different grades.

 

[BUGGAR]

"Refer to ACI 318 Appendix D."

Please let us know how that goes.

 

[Ron]

Anchor bolts can be subjected to shear, tension, compression or all three. Most designs are done for shear and tension combinations. You will need to know the loads and load orientations that the bolts must resist, the grade of steel for the anchor bolts, their embedment length, the strength of the concrete, bolt size, bolt hole size, etc. in order to do a proper check on the efficacy of the bolts.

 

[skylite]

I'm been reading ACI 318 Appendix D

So pryout (edge breakout) of anchors can occur for 16mm if the edge distance is less than 80mm (3 inches)? So none of you put any anchor that is less than 3 inches from edge?

What happens if another metal plate would be welded at the side of the concrete stand. How effective would this be in tensile pulling or loading? Here it's not just the anchor that prevents the pulling but also the metal plates welded to the sides with separate anchor bolts bolted at the side metal plates. The ACI doesn't mention this.