How to get the size of bolts to mount a steel section to the concrete wall? 11

[StathPol12]

I aim to mount a rectangular, long, steel section to the wall, using 3 steel plates. The 3 steel (arm) plates will be welded to the steel section to the one side, and then use bolts to mount them to the concrete (rigid) wall. What size of bolts shall I use?

 

[Tomfh]

The OP needs to define the purpose of this thing, and any applied loads, and the environment it will be in.

OP, tell us the weight, size and position of TV and

Also tell us what this concrete is. Why such a long post for a tv bracket? Why the anchors so far up, with the topmost bracket hard against the top edge?

 

[desertfox]

Hi stathpol12

Definitely speak to a structural engineer, my comment would be the first set of fixings might well be to close to the concrete edge.
If you want to calculate the bolt loads for the masses the are shown I would use the formula under this link “headed bolts under bending”

https://www.roymech.co.uk/Useful_Ta... joint is a,groups to fasten plates together.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[gte447f]

1503 does sort of have a point. There is an awful lot of discussion about this thing that we know very little about. Sort of making a mountain out of a mole hill that might actually be an ant hill instead, which we engineers tend to do sometimes. Before picking apart the design, I would want to know more about the specifics of what is this thing, what is its intended function, and what other loads will be on this thing?

 

[1503-44]

Just really wondering why we can't ever manage to answer just the question(s) asked. Especially when there is little need to subject the OP to the nth degree of interrogation for a simple DIY TV stand, or whatever it happens to be. Allow the OP some IQ. Excessive questions/warnings are simply not justified in all cases. IMO it only makes us look like a bunch of ivory tower idiots. What's wrong with answering a simple question asked, with a disclaimer or qualifier or two, if you really think it's needed. Who's going to go to a consultant's office, if they see we can't even answer such a simple question without half a day of assiciated interrogation and warnings about building inspectors, no calculations, falling off the wall, etc. etc .... ???

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[ThomasH]

The "structure" consists of 110 kg's of steel. That' is nothing considering there are 6 bolts involved. But is that the complete story? What is the purpose of that thing? I think there is some info missing regarding the loading.

I notice that the OP has not replied to any questions and has previously posted in the student forum and in the ABAQUS forum.
Simple reply to the question, check the catalog on-line from Hilti or something similar. But be sure to have the correct loading. And if you can't make an estimate regarding the bolt loading, that would be worrying for other reasons .

And he doesn't have to wait 2 weeks for a £5000 FEA analysis either.

I can understand your frustration. But I would say that FEA is serious overkill. Regardless of that, it won't take two weeks to model that thing.

 

[StathPol12]

Thanks for your replies guys. I thought i would post a question and get some feedback or guidance as I was trying to take into consideration all the comments while I was trying to do some calculations of the forces acting on the bolts, but as 1503-44 stated, it felt a bit as interrogation by a few people here. Anyway, I am not going to comment on that.

Thanks ThomasH for the suggestion, I will look into the Hilti, I can see they also have a software for anchors.

 

[ThomasH]

@StathPol12

I think it would be reasonable if you explained the purpose of that steel structure.

I don't think I have ever seen a steel structure designed only for self weight. I suspect that is one reason why you get a lot of questions. As for Hiltis software, you also neet to check how your loads shall be calculated to be design loads for the design software. That is code-dependant.

 

[jerseyshore]

How is asking the most basic of questions relating to a design interrogating? People here ask questions because they are relevant to the problem and solution. Open up any given thread and you'll probably find someone who asks a really important question that helps get to a good solution.

 

[ThomasH]

Considering that the "thing" is ~4.5 m high we can safely rule out any normal tv. So it if will function as support for anything the loads are probably wrong. But since the OP wont share any information its anybodys guess .

 

[JStructsteel]

I would use 1/2" expansion anchors w/o doing any calcs. 80kg is like what, 4 lbs?

 

[jerseyshore]

I would use 1/2" expansion anchors w/o doing any calcs. 80kg is like what, 4 lbs?

Hey look at this guy running calcs when that clearly isn't required.

 

[ThomasH]

80 kg + 3 * 10 kg = 110 kg

and

 

[jerseyshore]

Hey mods can we ban this calc guy? No calcs allowed here Thomas just answer the question.