Coping in W shapes beam

[Rovin069]

How do you compute the coping of sloping beam w10x12 that will be connect to beam w10x12 with a pitch of 1/4 inch or an angle of 1.19349 degrees?

 

[somewhatofanerd]

If simply pinned connection check the shear stress of web remaining.

Usually the steel fabricator does a good job at detailing the cuts.

 

[JedClampett]

If this beam is carrying any load, I'd be worried. W10 x 12's are tiny and taking any cope out of them is serious, not to mention a top and bottom cope that has to accomodate an angle. Whenever possible, I prefer to connect shallower beams to deeper beams. Connection wise, you would be better off with a W8 x 10 or W8 x 15. This might avoid the bottom cope.

 

[EngineeringEric]

Look at AISC Design Guide Examples. They will walk you through what to look at for the remaining portion of web material. As Jed mentioned you cannot get much capacity but since you are only dealing with W10x12 you are not dealing with much load.
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A reasonable sanity check is cutting 1" off top and bottom flange, and 3" deep will provide around 16.8 kips of capacity... again this is only a sanity check and something to help out. The values drop quickly(exponentially) when any of the dimensions or eccentricity changes much.
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As for the slope, you just have to calc it out by hand or draft it...

 

[paddingtongreen]

There is a lot we don't know so these might be out of place:

Like Jeb, I avoid running beams into supporting beams of the same depth like the plague.

I have set the supporting beams into the same plane. There is sometimes more work for their connections but a saving of work on the beam connections.

I have stepped roofs keeping the steps level and told the Architect to make the slopes and crickets with rigid insulation (this helps when their boss makes a last minute change to improve the drainage).

As a last resort, shop weld tab plates to the supporting beams so the supported beams can be dropped in and bolted; occasionally, the bottom flange has to be clipped on one side but this is much better than coping. Use friction bolts for this, if you are worried about the eccentricity although that should balance out with beams on two sides.

Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin

 

[AELLC]

I always thought the calculation for coped beams was straightforward - block shear check, right?

 

[paddingtongreen]

Block shear and bending on the remaining web.

Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin

 

[Rovin069]

suppose the beam doesn't carry too much load say in the roof framing or deck that the cope dont affect the strength of the beam, i can draft it in autocad as mention but how can i prove that the dimensions on the autocad that given is true? thanks ^^

 

[CELinOttawa]

Hand calculations can give you some assurance, but only a model or building it in real life is going to PROVE the angle is correct.