Clipping the end of a steel / Structural Issue

[kp00110]

Yes but you can get that same with timber? this is just a steel ridge beam and a steel rafter

 

[jeds]

Yes but you can get that same with timber? this is just a steel ridge beam and a steel rafter

How would you join the two timbers? That steel frame works because of the welded rigid joint.

 

[freddiemercurystwin]

Sky hooks of course John.

 

[kp00110]

even know its a vaulted ceiling, you could still replace that steel structure and still have normal timber rafters which could support a normal ridge beam and hip??

 

[kp00110]

yes its vaulted so need to restrain etc but the steel in the photo offers no benefit that i can see versus doing it in timber is all my question is

 

[kp00110]

this is an example similar

 

[jeds]

yes its vaulted so need to restrain etc but the steel in the photo offers no benefit that i can see versus doing it in timber is all my question is

How would you achieve a rigid joint between the timbers? One that could be calculated.

 

[freddiemercurystwin]

View attachment 292978this is an example similar

It's not though is it, both of those roofs have tie beams.

 

[kp00110]

.

 

[Muskett00]

Thanks, yeah its a vaulted ceiling. Been told that we need to padstone the internal wall to replace any load on the hip rafter, and we need to split the timber wall-plate and padstone above the window. 

 

[tony1851]

Who said you have to split the wall plate to padstone the bearing - SE or building inspector?

If the load is not excessive, its perfectly OK to seat a steel beam direct on the wall plate. The timber design codes give allowable bearing pressures on timber members perpendicular to the grain.

A 102 wide beam seated on a 100 wide C16 timber wall plate will support a load of around 20kN without the timber crushing - a little more if the beam is supporting a roof. This trick is often of use in loft conversions, where there is a lot of timber studwork which might be required to support a steel ridge beam.

If the load is a little more than the maximum allowed for the timber, you can slip an offcut of steel plate 12.5mm thick under the beam as an enlarged bearing plate = like a steel padstone.

 

[noseall]

The timber design codes give allowable bearing pressures on timber members perpendicular to the grain.

And 10mm of shrinkage?

 

[freddiemercurystwin]

What happens to all of those timbers that are supported off the steel that shrink too?

 

[noseall]

What happens to all of those timbers that are supported off the steel that shrink too?

I'm sure SE's have constants/predictables like masonry, steel and concrete, that they can rely upon. Why would you make a pad-stone out of rock hard materials only for it to shrink? lol.

 

[noseall]

What happens to all of those timbers that are supported off the steel that shrink too?

Timber does not shrink along its length.