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continuous beam design

continuous beam design

continuous beam design

(OP)
hi engineers
i need help for this problem
shear design and moment diagram of continuous beam of distance 4m , 4m , 2m .
thnks

RE: continuous beam design

Or buy BeamPro online.

Mike McCann, PE, SE (WA)


RE: continuous beam design

If we're talking about continuous beam software, I'd like to suggest GoBeam, which can be found at www.yakpol.net. It's a little more than BeamPro, $70 vs. $40, but has a lot more features including moving loads, plastic analysis, beam on elastic foundation, and beam-column frames. You also get two years of free upgrades. I have no financial interest in the program. I bought it a few years ago, and I love it!

RE: continuous beam design

Oh, and by the way, GoBeam handles both English and metric units.

RE: continuous beam design

(OP)
thnks engineers isn't it possible to calculate it manually

RE: continuous beam design

Yes, the method is linked in the first post.

RE: continuous beam design

(OP)
yes i have seen the method provided in the link the span is almost same , and mine the span is different ( i mean there is short side ).

RE: continuous beam design

Your case will be different than the example because your support conditions are likely different and your spans are different. Your original question asked how to get the shear and moment diagram; the answer is moment distribution or software. Sorry, but you're not going to be able to get someone on this site to do your work for you.

RE: continuous beam design

Moment distribution is pretty fundamental. If you can't do it currently you should definitely take this as an opportunity to go through it.

RE: continuous beam design

spats, can GoBeam be used with axial loads in the beam? Can it check axial and bending?

www.PeirceEngineering.com

RE: continuous beam design

(OP)
yes i need someone to help me and this is the whole question with fig and the beam is the red one
data given
Fy=460N/mm2
fcu=30 N/mm2
beam size = 250 * 450 mm
live load =2.5KN/m2
brick wall height = 3m
concrete density =25kg/m3
brick wall density= 18kg/m3
thickness of slab= 125mm
thickness of brick wall= 115mm
cover of beam =30mm
cover of slab =25mm

RE: continuous beam design

You can't expect to gain a structural engineering education from the internet.

RE: continuous beam design

(OP)
i believe sometimes it's possible when you get no whre else to go

RE: continuous beam design

Well, this site won't do it for you. The site is for exchange of information between practicing engineers who already have the education.

RE: continuous beam design

There's the three moment equation: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: continuous beam design

Quote:

i believe sometimes it's possible when you get no whre else to go

And in fact the link in the first response gives you all the information you need, with two alternative methods, so you can check you have the right answer.

There is also plenty of free software to do the job, including:

https://newtonexcelbach.wordpress.com/2015/11/29/c...

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: continuous beam design

PEinc,

GoBeam does analysis, not design.

RE: continuous beam design

Having looked at the sketch I recommend:

If it is homework, discuss it with your tutor.
If it is a real job discuss it with a colleague, or if there is no-one who knows structural engineering, hire one.

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: continuous beam design

Hokie:
You’ve really hit on something, we should start selling engineering diplomas here on E-Tips. The income would quickly outpace any ad revenue. We could sell the thrice weekly lessons, the text books and ref. books, we could even sell the homework answers, to the highest bidders, of course. Then, we could even do their daily work for them, for a price of course, once they had oversold themselves and gotten a paying job. Given what we are seeing with many OP’s. these days, there must be one hell of a market out there, with all the pretend engineers runnin around.

RE: continuous beam design

A 1959 publication by Portland Cement Association entitled "Continuity in concrete building frames" discussed among other things, Two Cycle Moment Distribution. As a hand method, I found it ideal and used it in the analysis of many continuous beams in the days before computers became the norm for performing engineering calculations.

Two cycle distribution is much faster to perform than a full Hardy Cross distribution and has the advantage that it gives the maximum negative and positive moments in all spans regardless of where the live load is placed.

It also gives the minimum positive moment in cases where negative moment can occur across the entire span as perhaps would occur with the 2m span in the example mentioned by the OP.

I don't know if the publication is still available from PCA but it is available on the internet.

BA

RE: continuous beam design

I reckon we should've been able to predict this thread's direction from the original post ...

we've given several methods to solve this ... MDM is a good standard, and a good analytical tool to have. You've tried it, well, looked at the link. Have you run though a worked problem? Setting up a MDM problem is a little daunting but you should be able to adapt a worked example to your particular case. The geometry is easy, the loads on the spans a little tricky; then the coefficients are quite tricky, but see how they're used in an example. Then the solution procedure is pretty straight forward, again, once you've worked through an example.

The more you show you've tried, the more tolerant we'll be. This site is meant to be for professional engineers, and maybe you are one. This site is meant for real work, and maybe this isn't school work. Yes, a lot of us are crabby b@$t@rd$ but we like our profession and will try to help those who show they've put in some effort. From what you've posted, I think you want to (or wanted to) work out this problem, we gave you a link and either you tried it or you got confused before you could get going. Show us how you applied MDM to your problem, and we can probably help some.

you may try MIT's "opencourseware" site or there must be lot's of sites online (maybe even a youtube video) to show you how to do MDM.

another day in paradise, or is paradise one day closer ?

RE: continuous beam design

I found a 1935 version of BA's doc: Link. There's some neat, practical stuff in there in addition to the two-cycle moment distribution. It's a photograph and not much fun to read though. I ordered a hard copy off of Amazon for $4.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: continuous beam design

Quote:

I found a 1935 version of BA's doc

Any information on how they transported it back in time by 24 years?

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: continuous beam design

Ha! I believe that the '59 was the fourth edition.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: continuous beam design

OK, looks like I found the same version.

I guess that transporting a document forward in time is not so difficult, so long as you are happy to stick to 1 year/year.

Anyway, looks like a very interesting publication.

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: continuous beam design

spats, thank you but I asked if GoBeam could be used with axial loads in the beams, not if the program did design. However, I did contact the developer of GoBeam and his answer is that the program cannot handle axial loads in the beam.

www.PeirceEngineering.com

RE: continuous beam design

It is interesting that the 1935 PCA booklet mentioned by KootK is available on the internet but the 1959 edition is not even though there are substantial differences in presentation.

A shorter document (10 pages) dealing with 2 cycle distribution is found here:

BA

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