AH_AK
Mechanical
- Jul 27, 2022
- 14
I am looking for some clarification concerning the calculation of lateral wind load on the timber framing of an open, monoslope carport with a slope angle <5 degrees.
I am all good on the roof loads.
27.3.2 states that an additional horizontal force (parallel to the ridge) needs to be added for structures with "transverse frames" according to 28.3.5. This makes sense as the roof wind load will not generate any force parallel to the ridge, but there will be a force acting on the fascia/frame when the wind direction is parallel to the ridge.
Question #1: equation 28.3-3 says GC_pf_windward should be based on (5 and 5E) for windward. It uses the term "average", but does not state how this average is to be taken. Should the weighting of 5 and 5E be equal, or, weighted in accordance with the a/B ratio?
Question #2: I am getting a value for the longitudinal load that is ~2x larger than if I treated the framing as two, single-plane open frames (C_f=2) via 29.4. Since this is a building structure I am inclined to go with the more conservative value obtained via 28.3-3. Is this appropriate? The timber framing would constitute "transverse frames" in 28.3.5, correct?
I am all good on the roof loads.
27.3.2 states that an additional horizontal force (parallel to the ridge) needs to be added for structures with "transverse frames" according to 28.3.5. This makes sense as the roof wind load will not generate any force parallel to the ridge, but there will be a force acting on the fascia/frame when the wind direction is parallel to the ridge.
Question #1: equation 28.3-3 says GC_pf_windward should be based on (5 and 5E) for windward. It uses the term "average", but does not state how this average is to be taken. Should the weighting of 5 and 5E be equal, or, weighted in accordance with the a/B ratio?
Question #2: I am getting a value for the longitudinal load that is ~2x larger than if I treated the framing as two, single-plane open frames (C_f=2) via 29.4. Since this is a building structure I am inclined to go with the more conservative value obtained via 28.3-3. Is this appropriate? The timber framing would constitute "transverse frames" in 28.3.5, correct?
