Internal Wind Pressure on Roof Beam
Internal Wind Pressure on Roof Beam
(OP)
Hi everyone!
I have a question from a structural course I took a while ago (I am starting to get into residential design). The question is as follows: a load bearing wall is to be removed in a single storey house. The roof is stick-built, so we were given a snow load to design for (along with dead load). However, they made no mention of accounting for the internal wind pressure. Should this be accounted for in the design? In the case the internal wind pressure is acting "downwards" (same direction as snow and dead load), this will increase the loads acting on the beam so I figure it should be accounted for.
Thanks in advance!
I have a question from a structural course I took a while ago (I am starting to get into residential design). The question is as follows: a load bearing wall is to be removed in a single storey house. The roof is stick-built, so we were given a snow load to design for (along with dead load). However, they made no mention of accounting for the internal wind pressure. Should this be accounted for in the design? In the case the internal wind pressure is acting "downwards" (same direction as snow and dead load), this will increase the loads acting on the beam so I figure it should be accounted for.
Thanks in advance!






RE: Internal Wind Pressure on Roof Beam
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RE: Internal Wind Pressure on Roof Beam
RE: Internal Wind Pressure on Roof Beam
RE: Internal Wind Pressure on Roof Beam
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RE: Internal Wind Pressure on Roof Beam
RE: Internal Wind Pressure on Roof Beam
Beam No. 1: No internal pressure as it cancels out.
Beam No. 2: If it is a truss framed roof, yes there would be internal pressure, applied in both directions as pressure and suction, as separate cases. If it is a stick framed roof the internal pressure would be applied to the underside of the rafters, in both directions as pressure and suction, as separate cases.
Assuming you are talking about Main Frame Wind Resisting Systems (MFWRS) and you are using ASCE 7 - XX.
Jim
RE: Internal Wind Pressure on Roof Beam
Interesting, why the difference between the trusses and the rafters? And I am actually in Canada so I use the NBCC but I'm sure the principles are similar.
RE: Internal Wind Pressure on Roof Beam
Jim
RE: Internal Wind Pressure on Roof Beam
BA
RE: Internal Wind Pressure on Roof Beam
RE: Internal Wind Pressure on Roof Beam
BA
RE: Internal Wind Pressure on Roof Beam
RE: Internal Wind Pressure on Roof Beam
For a building with significant openings, I would make allowances for it.
BA
RE: Internal Wind Pressure on Roof Beam