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Yes cyclonic winds are a whole 'nuther beast! AS4055 is the baby document for the general 1170.2.Indrajith said:I believe structures designed with this much ultimate pressures would be stiff enough for deflections and additional service checks for these small value may not have to be performed.
OP said:I noticed for ultimate (+5.33 kPa) and for service (+1.63kPa)
OP said:I believe structures designed with this much ultimate pressures would be stiff enough for deflections and additional service checks for these small value may not have to be performed.
Tomfh said:Which cases are these? It's uncommon for ultimate to be that much higher than service wind.
Indrajith IB said:I noticed for ultimate (+5.33 kPa) and for service (+1.63kPa). its almost (X 3.2 times higher) and it made me confused.
ElliottJames said:Personally I think a more honest approach with the public is to say, "We expect the structure to begin to fail and accrue damage at around 130 mph, but that wind speed is very rare and is only expected to occur once every 700 years
A couple of people have already pointed how this assertion incorrect about the safety.ElliottJames said:Wow. I have a different view of what Ultimate wind loads are. It has nothing to do with safety. Using 1.2D + 1.0W + L combo for example, note the lack of load factors except 1.2 for dead load. When designing to this load combo, the structure is at the yield point. It is on the knife's edge of complete failure and it is not a safe place to be. (Only talking about wind here, and am excluding designing for ductility to dissipate seismic energy).
ElliottJames said:Wow. I have a different view of what Ultimate wind loads are. It has nothing to do with safety.