Beam Splice

[Tejaswini murthy]

Hello all,
i have a requirement of joining 2 sections by giving welded splice connection.
I had proposed attached splice design.
But, now due to site requirement, i have to remove top flange splice. So, how can I go about this design. If i remove top splice, some member as to be there to take the compression acting?
Kindly share your knowlegde.

 

[jimstructures]

You need to give a more complete explanation of your problem and a more complete explanation of your question.

Jim

 

[Tejaswini murthy]

Dear Jim,

Thanks for your response.
I have to design a welded Splice connection without top flange splice plate.
I am asking out help on the same.

Tej

 

[r13]

Butt weld the flanges, if the flange plates are not required for strength.

 

[gtaw]

I think they are asking for more information such as; is this beam supported at the ends only or does it span multiple supports. How long is the beam? What is the size of the beam? Where is the splice, midspan, toward one end? How long, wide, and how thick are the "fish plates"? What is the span? Are you planning on welding the top and lower flanges using complete joint penetration groove welds? Are you welding the web with a complete joint penetration groove weld? What is the application? What are the loads? Just for fun, what is the material specification?

On a side note, are the welders qualified (certified). Do you have a welding procedure? What welding process and electrodes are you planning to use? Is there a governing code?

So many questions.

Oh yea, one last question. Look at your sketch, are all the welds you propose accessible for welding or are they located where the welder has direct line of sight and room to maneuver his electrode or gun? I see about half of the welds have poor to very limited access. Poor access equals poor welds.

 

[rb1957]

you say "without a top flange splice" … can you splice the lower flange ?

do you Have to use flat web splice plates ? … if you used angles you could avoid the most difficult welds. You could use one angle to pick up the web and one flange, and strap the other flange, and/or a second angle to pick-up the angle (web) and the other flange.

butt welding the two halves is an option, but reduces the tension allowable of the (presumably) lower flange to that of the weld material (and the heat affected zone). You "could" butt weld under the splice, possibly as the shear connection over the joint and use angles on the internal faces to splice the upper and lower caps.

many ways to skin chickens … your proposal looks the most difficult.

How many of these joints do you have ? <10 ? >100 ??

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

 

[oldestguy]

Put enough steel in other places and check that your moment of inertia is as good or better than with a top late. The neutral axis will shift, but no problem.

 

[BAretired]

If the top flange is always in compression, you don't need a splice plate provided you can keep the flanges aligned and bearing fully against each other. If the top flange can be in tension, they would need to be butt welded.


BA