Anchor Bolts,18J bar 1

[ray81]

Can somebody else explain to me what mean of anchor bolts, 18J bar? And what grade is this type of anchor bolts call??
Thanks.

 

[hokie66]

I am just guessing, but the 18J may be the mark or call of a particular anchor bolt which is specified in a schedule or detail. If that is the case, you need to have the drawing which contains the schedule or detail in order to identify the anchor bolt. And then the grade may be on another drawing in general notes. So you probably need more drawings than someone has furnished to you.

 

[transmissiontowers]

The 18J is a Jumbo designation made for anchor bolts and has a slightly larger diameter so that you can get a 2.25" threaded UNC nut on it. The yield is 75 ksi. A normal 18 bar is too small to get the threads to be fully formed. We use a lot of these in the electric utility industry. There is usually a Charpy impact value specified to ensure a ductile failure.

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I have been called "A storehouse of worthless information" many times.

 

[hokie66]

Thanks, transmission, I learn something every day. ray81 would probably have gotten his answer earlier in some other forum.

 

[transmissiontowers]

There is a fine line in structural engineering of steel structures. I do the majority of my designs above the top of concrete and apply overload factors to the loads and design using an LRFD approach. When designing the anchor bolts, I take the base loads and design the above TOC part of the A-Bolts.

With these 18J bolts, I then give the foundation person the base loads and anchor bolt diameter and let them pick the correct embedment length for the 18J's and design the drilled pier for the loads. I don't know much about how they do the foundation, but I hear phrases like "I take the loads given and apply a 1.5 overload then design the foundation". To me this is applying overloads on top of overloads.

In my line of work we would rather have the steel structure fail before the foundation fails so there is a chance that we can rebuild the structure on top of the old foundation.

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I have been called "A storehouse of worthless information" many times.

 

[MikeDB]

transmissiontowers is correct that the 18J is a Jumbo #18 rebar. It is not recognized by any standard that I am aware of. I think that there is only one company that makes the bars. I think that they are made to ASTM A615, except larger diameter. There is a #14J also.

 

[ray81]

Thanks everyone gave the information to me. I appreciated it. I am beginner in Transmission Line, And a lot of things i need to know and catch up. So if i don't understand something then i will post my Question on this forum and i hope you all will help me. Thanks again. Have a nice day to everyone here. God bless.

 

[transmissiontowers]

ray81; Welcome to the industry. Your company will probably use PLS-CADD to do the line design. If you are a structural type, you will need to read the NESC code, ASCE Manual 74 for the loads (currently in revision), ASCE 10 for lattice tower design, ASCE 48 for pole design and the soon to be released ASCE 113 on substation design.

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I have been called "A storehouse of worthless information" many times.