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Four sided concrete roof

Four sided concrete roof

Four sided concrete roof

(OP)
Im an entry level engineer and have never designed a four sided roof (i think thats the term in english). I was wandering i you knew where to find information in regards on how to specify the reinforcement.

RE: Four sided concrete roof

Speaking for myself, I am not familiar with the term "four sided roof".  Would you mind describing it?

RE: Four sided concrete roof

Is this a concrete slab spanning two directions, to four perimeter walls?

RE: Four sided concrete roof

(OP)
Its a roof that slopes in four directions. They are very effective for wind pressures. It like a gabled roof but in two directions.

RE: Four sided concrete roof

That's called a Hip Roof.

RE: Four sided concrete roof

(OP)
Thanks.

RE: Four sided concrete roof

(OP)
I have consulted and researched this and found different ways to specify the steel. I have seen one that I can not understand. It has steel in both directions with standards hooks at the end and also the temp reinforcement. It is the same as placing the regular reinforcement with dowels?

RE: Four sided concrete roof

boricuastructural,

Are you sure that this is meant to be done in concrete? It is usual to do this type of roof in timber trusses.

csd

RE: Four sided concrete roof

(OP)
csd72,

Yes. It is done in Puerto Rico where I live.

RE: Four sided concrete roof

Watch out for the bowstring effect at the crank in the top of the roof.

csd

RE: Four sided concrete roof

Si Buena,

Watch out for the bowstring effect at the crank at the top. The bottom reinforcement should continue up to lap with the top reinforcement frm either side (i.e. a kind of a splice).

Otherwise if you just had a bent piece of bar it would want to straighten and would therefore break out of the cover concrete (like a bowstring).

csd

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