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anchor bolts in concrete
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Posted by: lancealot72

11/06/2006, 14:05:20

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I have a problem I am hoping to get help with.

I have four 1/2 bolts approximately 8" long that have been set in concrete and another 2" that stick out of the concrete that will bolt a 1/2" plate down. how do I determine the max force needed to rip those bolts out of the concrete. I am assuming that is the weak point of this design.

my problem is that i am mounting a steel pole that is welded onto the 1/2" steel plate and extends about 15 feet in the air and certain small equipment will be mounted to it. I want to make sure that it will not fall over in high winds. What force will be required to rip the bolts out of the concrete?

am i approaching this problem in the right way?

thanks!








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Re: anchor bolts in concrete
Re: anchor bolts in concrete -- lancealot72 Post Reply Top of thread Forum
Posted by: randykimball
Barney
11/06/2006, 21:23:12

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Lance,
What shape is the portion of the bolts incased in concrete? Is it the heads of standard hex bolts or ell shaped ends of what leg length"

What is the concrete mix? What portions of what did you mix the concrete with? Did you add any hardening agents?

I won't be able to answer the question, but these are things that will be needed to answer.

Good Luck...





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Re: Re: anchor bolts in concrete
Re: Re: anchor bolts in concrete -- randykimball Post Reply Top of thread Forum
Posted by: swearingen

11/07/2006, 08:21:43

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The things that Randy mentioned, among many others are needed to answer the question:

- What is the design wind speed where your are located?
- How big is the piece of machinery on the pole?
- What is the spacing of the bolts?
- What material are the bolts?
- Is there grout under the base plate?
- What is the reinforcement in the concrete and how is it arranged?

You really should get a structural engineer to look at this. This can be sewn up by properly using ASCE 7-05 and AISC Design Guide 1, "Column Base Plates".








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