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Design

07/21/2016 11:48 AM

I have an i-beam placed horizontally and i want to apply 1 ton point load on its center. Now i will run a stress analysis on ansys on it and will get the displacement in the beam on the mentioned load. How will i know tht the displacement value i am getting is good or bad?

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#1

Re: Design

07/21/2016 12:10 PM

You won't know until you test it with a real I-beam and one ton of force. Welcome to engineering.

Sorry for being flippant, but any stress analysis is only as good as the data you feed it. If you have very good material data on the I-beam you plan to use, the stress analysis results can be very good.

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#2

Re: Design

07/21/2016 12:16 PM

Good or bad, compared to what?
That's why engineering has standards and specifications.

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#3

Re: Design

07/21/2016 12:25 PM

If i find deflection analytically and thru ansys and both values validate eachother. But tht wud not be the measure tht specific amount of deflection is good for the beam or not ?

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#4
In reply to #3

Re: Design

07/21/2016 12:30 PM

I believe the question you want answered is how much deflection is considered acceptable for a given I-beam. I would start here:

https://www.google.com/?gws_rd=ssl#q=acceptable+deflection+of+a+steel+beam

or here:

http://cr4.globalspec.com/thread/100373

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#7
In reply to #4

Re: Design

07/21/2016 1:38 PM

Interesting about the last reference.... I complete that project up last February. I was told to focus at the project at hand and NOT to look at the stresses and they did not want me doing the again.

Here's an update when the project got started.

Crane$ 2,500.00Portal to portal costs
Crane$ 450.00hourly cost
Refractory crew$ 1,560.00hour (12 men @ $130.00/hour each)
Inhouse Crew$ 140.00hour (4 men @ $35.00/hour each)
** Total$ 2,150.00hour
** not including the $2500.00 portal to portal cost for crane

When we were well on our way of rebuilding, one of the managers were concerned that some of the maintenance people were complaining that the structure would not hold up. I had something to do with that, because I told the maintenance and showed the issues. (Just due to safety)

So my manager came up to me and said that to me that there's concern about the integrity of the structure.

Well, my response to him was..., I first used his words against him and watched him sweat. What he didn't know was, I already initiated plan 'B' of reinforcing the structure and that was already half complete. And I told him, the structure will now hold up to the stresses. I tend and rather do things correctly and ask for forgiveness later.

What pissed me off, he then said "It was my call".... wtf.... now its my call when I have $2150.00/hour, scheduled down-time but it wasn't my call a year ago when I brought the issue up and was told not to worry about it.

By the way, when I was told not to worry about it, that was being kind... I was actually reprimanded.

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#13
In reply to #7

Re: Design

07/21/2016 6:49 PM

With that kind of 'support' I think I would be looking to contribute somewhere else. But then again, there can be many other variables that plays into that sort of decision. Paper trails can be very important in these situations.

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#15
In reply to #13

Re: Design

07/21/2016 8:15 PM

I am... Or was.... One thing happen, I received a letter from the owners (three of them) of the company and out of the blue, gave me a 5 figured bonus... (Nice to be appreciated)

You were right.... What was at issue, they (management) didn't want to risk having to recertification the oxidizer (EPA, DNR, ....) because it was grandfathered in. Hell, I easily could have and did worked it in a maintenance program. But to risk safety by the managers for the sake of paper work, that irked me.

I'm still open because I don't want to keep fighting 'the internal system'.

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#5
In reply to #3

Re: Design

07/21/2016 1:22 PM
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#12
In reply to #5

Re: Design

07/21/2016 5:54 PM

Billiard hall: L/1000 ??

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#6

Re: Design

07/21/2016 1:34 PM
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#8

Re: Design

07/21/2016 2:01 PM

Thankyou guys....it seems in civil there are codes for the allowable deflection.

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#10
In reply to #8

Re: Design

07/21/2016 5:18 PM

You might consider loosing your texting shorthand, it will make you sound more credible if you use complet words

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#11
In reply to #10

Re: Design

07/21/2016 5:50 PM

Give a letter here, take a letter there. (Extra o in loosing, missing e in complet.)

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#14
In reply to #11

Re: Design

07/21/2016 6:52 PM

I think that wuz tong in chek.

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#16
In reply to #11

Re: Design

07/21/2016 8:41 PM

Give him a break. He just has loose vowels.

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#17
In reply to #8

Re: Design

07/22/2016 4:58 AM

That's right, but I would calculate deflection manually as a check on ansys (whatever that is, I haven't heard of it, but I haven't been into these things for years).

it's about as simple a beam calc as you could wish for, good practice and e.g. to make sure you've entered the data correctly into ansys. Also you need to decide whether the beam ends are fixed or supported, you didn't say.

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#18
In reply to #17

Re: Design

07/22/2016 5:03 AM

Both ends are fixed

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#19
In reply to #17

Re: Design

07/23/2016 12:27 AM

I like the assumption that both ends are unsupported; then the beam is in free fall and the deflection is zero, until it hits something.

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#20
In reply to #19

Re: Design

07/24/2016 4:36 AM

I trust that's a joke, but I only gave 2 options, fixed or (simply) supported. Where does unsupported come from? ��

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#9

Re: Design

07/21/2016 3:04 PM

Just use a two ton I-beam.

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